AMT / American Tower Corporation - Depositi SEC, Relazione annuale, dichiarazione di delega

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 3, 2025 AMERICAN TOWER C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 3, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): August 22, 2025 AMERICAN TOWER COR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): August 22, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission F

AMERICAN TOWER CORPORATION ANNOUNCES ELECTION OF GENE REILLY TO BOARD OF DIRECTORS

Exhibit 99.1 ATC Contact: Spencer Kurn Senior Vice President, Investor Relations Telephone: (617) 375-7517 AMERICAN TOWER CORPORATION ANNOUNCES ELECTION OF GENE REILLY TO BOARD OF DIRECTORS Boston, Massachusetts – August 25, 2025 – American Tower Corporation (NYSE: AMT) announced that its Board of Directors has elected Gene Reilly as a director. Mr. Reilly most recently served as the Vice Chairman

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended June 30, 2025. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name of r

AMERICAN TOWER CORPORATION REPORTS SECOND QUARTER 2025 FINANCIAL RESULTS

Exhibit 99.1 Contact: Kate Reeb Senior Director, Investor Relations Telephone: (617) 375-7565 AMERICAN TOWER CORPORATION REPORTS SECOND QUARTER 2025 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS(1)(2) Second Quarter 2025 ● Total revenue increased 3.2% to $2,627 million(3) ● Total property revenue increased 1.2% to $2,527 million(3) ● Net income decreased 58.1% to $381 million, primarily due to foreign

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): July 29, 2025 AMERICAN TOWER CORPO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): July 29, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

As filed with the Securities and Exchange Commission on June 2, 2025.

Table of Contents As filed with the Securities and Exchange Commission on June 2, 2025.

Form of Underwriting Agreement for non-convertible debt securities.

Exhibit 1.1 AMERICAN TOWER CORPORATION [Principal Amount / Title of Securities] UNDERWRITING AGREEMENT [Date] To the Representatives of the Several Underwriters named in Schedule A hereto, Dear Ladies and Gentlemen: 1. Introductory. American Tower Corporation, a Delaware corporation (the “Company”), subject to the terms and conditions set forth herein, agrees with the several Underwriters named in

Indenture dated as of June 2, 2025, by and between American Tower Corporation and U.S. Bank Trust Company, National Association, as Trustee.

Exhibit 4.34 AMERICAN TOWER CORPORATION INDENTURE Dated as of June 2, 2025 U.S. Bank Trust Company, National Association Trustee ARTICLE 1 DEFINITIONS 1 SECTION 1.01 Certain Terms Defined 1 ARTICLE 2 SECURITY FORMS 4 SECTION 2.01 Forms Generally 4 SECTION 2.02 Form of Trustee’s Certificate of Authentication 9 ARTICLE 3 ISSUE, EXECUTION, FORM AND REGISTRATION OF SECURITIES 10 SECTION 3.01 Amount Un

Filing Fee Exhibit

EXHIBIT 107 Calculation of Filing Fee Table FORM S-3 (Form Type) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee  Rate  Amount of Registration Fee Carry Forward  Form Type Carry Forward  File Number Carry Forward Initial Effective Date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Equity  Common Stock, par value $0.

Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of U.S. Bank Trust Company, National Association, as trustee under the Indenture dated June 2, 2025.

Exhibit 25.1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 91-1821036 I.R.S. E

Form of Subordinated Indenture between American Tower Corporation and U.S. Bank National Association, as Trustee.

EX-4.36 Exhibit 4.36 AMERICAN TOWER CORPORATION SUBORDINATED INDENTURE Dated as of [    ], 20[ ] [ ] Trustee Article I DEFINITIONS 6 SECTION 1.01. Certain Terms Defined 6 Article II SECURITY FORMS 10 SECTION 2.01. Forms Generally 10 SECTION 2.02. Form of Trustee’s Certificate of Authentication 10 Article III ISSUE, EXECUTION, FORM AND REGISTRATION OF SECURITIES 11 SECTION 3.01. Amount Unlimited; I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 American Tower Corporation (Exact name of regis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 American Tower Corporation (Exact name of registrant as specified in its charter) Delaware 65-0723837 (State or other jurisdiction of incorporation or organization) (IRS Employer Identification No.

Supplemental Indenture No. 9, dated as of May 30, 2025, by and among American Tower Corporation, U.S. Bank Trust Company, National Association, as trustee, and U.S. Bank Europe DAC, UK Branch, as paying agent

Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee and U.S. Bank Europe DAC, UK Branch As Paying Agent SUPPLEMENTAL INDENTURE NO. 9 Dated as of May 30, 2025 to BASE INDENTURE Dated as of June 1, 2022 €500,000,000 Principal Amount 3.625% SENIOR NOTES DUE 2032 TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 1 Section 1.01.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 30, 2025 AMERICAN TOWER CORPOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 30, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

Calculation of Filing Fee Table American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 Calculation of Filing Fee Table 424(b)(2) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security  Type  Security Class Title Fee Calculation or Carry Forward Rule Amount Registered (1) Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price (2) Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt  3.

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation €500,000,000 3.625% Senior Notes due 2032

Filed Pursuant to Rule 424(b)(5) Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 €500,000,000 American Tower Corporation €500,000,000 3.625% Senior Notes due 2032 We are offering €500,000,000 of 3.625% Senior Notes due 2032 (the “notes”). We will pay cash interest on the notes on May 30 of each year, beginning on May 30, 2026. The notes will mature on May 30, 203

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 21, 2025 AMERICAN TOWER CORPOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 21, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

Final Term Sheet AMERICAN TOWER CORPORATION May 21, 2025 Issuer: American Tower Corporation (“AMT”) Coupon: 3.625% Senior Notes due 2032 Principal Amount: €500,000,000 Maturity Date: May 30, 2032 Offering Format: SEC registered (Registration No. 333-

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - May 21, 2025 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2032 in an aggregate principal amount of €500.0 million (approxi

SUBJECT TO COMPLETION, DATED MAY 21, 2025. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation €    % Senior Notes due 2032

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-265348 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED MAY 21, 2025. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 €    American Tower Corporation €    % Senior Notes

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — May 15, 2025 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors has declared a quarterly cash distribution of $1.70 per share on shares of the Company’s common stock. The distribu

Financial Statements and Exhibits, Other Events, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 14, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): April 29, 2025 AMERICAN TOWER CORP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): April 29, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended March 31, 2025. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name of

AMERICAN TOWER CORPORATION REPORTS FIRST QUARTER 2025 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS FIRST QUARTER 2025 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS(1)(2) First Quarter 2025 ● Total revenue increased 2.0% to $2,563 million(3) ● Total property revenue increased 0.2% to $2,488 million(3) ● Net income decreased 45.9% to $499 million, primarily

EX-99.25

EX-99.25 2 ruleprovisionnotice.htm NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on April 15, 2025, pursuant to the provisions of Rule 12d2-2 (a). [ X ] 17 CFR 240.12d2-

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Ame

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement. ☐ Confid

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Ame

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement. ☐ Confid

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 17, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 14, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission F

Supplemental Indenture No. 8, dated as of March 14, 2025, by and between American Tower Corporation and U.S. Bank Trust Company, National Association, as trustee

Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee SUPPLEMENTAL INDENTURE NO. 8 Dated as of March 14, 2025 to BASE INDENTURE Dated as of June 1, 2022 $1,000,000,000 Principal Amount $650,000,000 4.900% SENIOR NOTES DUE 2030 $350,000,000 5.350% SENIOR NOTES DUE 2035 TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 1    Sect

Calculation of Filing Fee Table American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 Calculation of Filing Fee Table 424(b)(2) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security  Type  Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price (1) Fee Rate Amount of Registration Fee Carry Forward Form Type Carry Forward File Number Carry Forward Initial Effective Date Filing Fee Previously Paid In Connection with Unsold Securities to be Carried Forward Newly Registered Securities Fees to Be Paid Debt  4.

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $650,000,000 4.900% Senior Notes due 2030 $350,000,000 5.350% Senior Notes due 2035

424B2 Table of Contents Filed Pursuant to Rule 424b2 Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $1,000,000,000 American Tower Corporation $650,000,000 4.900% Senior Notes due 2030 $350,000,000 5.350% Senior Notes due 2035 We are offering $650,000,000 of 4.900% Senior Notes due 2030 (the “2030 notes”) and $350,000,000 of 5.350% Senior Notes due 2035 (the “203

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 11, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

SUBJECT TO COMPLETION, DATED MARCH 11, 2025. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $     % Senior Notes due 2030 $     % Senior Notes due 2035

Table of Contents Filed Pursuant to Rule 424B5 Registration No. 333-265348 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED MARCH 11, 2025. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $    American Tower Corporation $     % Senior Notes

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - March 11, 2025 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2030 and 2035 in aggregate principal amounts of $650.0 million

Final Term Sheet AMERICAN TOWER CORPORATION March 11, 2025 Issuer: American Tower Corporation (“AMT”) Coupon: 4.900% Senior Notes due 2030 (the “2030 Notes”) 5.350% Senior Notes due 2035 (the “2035 Notes”) Principal Amount: 2030 Notes: $650,000,000 2

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — March 6, 2025 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors has declared a quarterly cash distribution of $1.70 per share on shares of the Company’s common stock. The distrib

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 6, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 27, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Letter Agreement, dated as of January 3, 2025, by and between the Company and Richard Rossi

Exhibit 10.32 January 3, 2025 Richard Rossi Dear Rich: I am pleased to confirm your promotion to Executive Vice President and President, U.S. Tower of American Tower Corporation (the “Company”) effective January 13, 2025. In this position you will be reporting to Steve Vondran, President and Chief Executive Officer. This is an exempt position, and your new annual rate of base compensation will be

AMERICAN TOWER CORPORATION REPORTS FOURTH QUARTER AND FULL YEAR 2024 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS FOURTH QUARTER AND FULL YEAR 2024 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS(1)(2) Fourth Quarter 2024 Full Year 2024 ● Total revenue increased 3.7% to $2,548 million ● Total revenue increased 1.1% to $10,127 million ● Total property revenue increased 2.0%

Subsidiaries of the Company

Exhibit 21 SUBSIDIARIES OF AMERICAN TOWER CORPORATION Subsidiary Jurisdiction of Incorporation or Organization 10 Presidential Way Associates, LLC Delaware 52 Eighty Partners, LLC Delaware 52 Eighty Tower Partners I, LLC Delaware ACC Tower Sub, LLC Delaware ActiveX Telebroadband Services Private Limited India Adquisiciones y Proyectos Inalámbricos, S.

American Tower Corporation Anti-Insider Trading Policy

Exhibit 19.1 Anti-Insider Trading Policy 1. Purpose This policy provides all Company Persons and Directors with the restrictions and necessary guidelines for anti-insider trading. Superseding all established and existing company guidelines and/or policies and procedures on anti-insider restrictions, this policy is effective January 1, 2003 and remains in effect subject to any amendments or restate

Letter Agreement, dated as of January 3, 2025, by and between the Company and Eugene M. Noel

Exhibit 10.31 January 3, 2025 Eugene Noel Dear Bud: I am pleased to confirm your promotion to Executive Vice President and Chief Operating Officer of American Tower Corporation (the “Company”) effective January 13, 2025. In this position you will continue to report to Steve Vondran, President and Chief Executive Officer. This is an exempt position, and your new annual rate of base compensation wil

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 25, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Amendment No. 2 to the Second Amended and Restated Term Loan Agreement, dated as of January 28, 2025, among the Company, as borrower, Mizuho Bank, Ltd., as administrative agent, and a majority of the lenders under the Second Amended and Restated Term Loan Agreement, dated as of December 8, 2021, as further amended

Exhibit 10.42 EXECUTION VERSION AMENDMENT NO. 2 TO THE SECOND AMENDED AND RESTATED TERM LOAN AGREEMENT Dated as of January 28, 2025 AMENDMENT NO. 2 TO THE SECOND AMENDED AND RESTATED TERM LOAN AGREEMENT (this “Amendment”) by and among AMERICAN TOWER CORPORATION, a Delaware corporation (the “Borrower”), the financial institutions party hereto (collectively, the “Lenders”), and MIZUHO BANK, LTD., as

Amendment No. 2 to the Fourth Amended and Restated Revolving Credit Agreement, dated as of January 28, 2025, among the Company and certain of its subsidiaries as borrowers, Toronto Dominion (Texas) LLC, as administrative agent, and a majority of lenders under the Fourth Amended and Restated Revolving Credit Agreement, dated as of December 8, 2021, as further amended

Exhibit 10.39 EXECUTION VERSION AMENDMENT NO. 2 TO THE FOURTH AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT Dated as of January 28, 2025 AMENDMENT NO. 2 TO THE FOURTH AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT (this “Amendment”) by and among AMERICAN TOWER CORPORATION, a Delaware corporation (the “Borrower”), the financial institutions party hereto (collectively, the “Lenders”), and TORONTO

Description of Registrant’s Securities

Exhibit 4.34 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 As of February 18, 2025, American Tower Corporation has 14 classes of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): (1) our common stock; (2) our 1.375% senior notes due 2025 (the “1.375% Notes”); (3) our

Amendment No. 3 to the Third Amended and Restated Multicurrency Revolving Credit Agreement, dated as of January 28, 2025, among the Company and certain of its subsidiaries as borrowers, Toronto Dominion (Texas) LLC, as administrative agent, and a majority of lenders under the Third Amended and Restated Multicurrency Revolving Credit Agreement, dated as of December 8, 2021, as further amended

Exhibit 10.36 EXECUTION VERSION AMENDMENT NO. 3 TO THE THIRD AMENDED AND RESTATED MULTICURRENCY REVOLVING CREDIT AGREEMENT Dated as of January 28, 2025 AMENDMENT NO. 3 TO THE THIRD AMENDED AND RESTATED MULTICURRENCY REVOLVING CREDIT AGREEMENT (this “Amendment”) by and among AMERICAN TOWER CORPORATION, a Delaware corporation (the “Company”), certain of the Company’s subsidiaries (together with the

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One): ☒ Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the fiscal year ended December 31, 2024 ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the transition period from to Commission File Number: 001-14

AMERICAN TOWER CORPORATION ANNOUNCES ELECTION OF RAJESH KALATHUR TO BOARD OF DIRECTORS

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION ANNOUNCES ELECTION OF RAJESH KALATHUR TO BOARD OF DIRECTORS Boston, Massachusetts – February 5, 2025 – American Tower Corporation (NYSE: AMT) announced that its Board of Directors (the “Board”) has elected Rajesh (“Raj”) Kalathur as a director. Mr. Kalathur i

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 5, 2025 AMERICAN TOWER CO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 5, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): January 28, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Amended and Restated By-Laws of the Company, effective as of January 3, 2025

HTML Exhibit 3.1 AMENDED AND RESTATED BY-LAWS OF AMERICAN TOWER CORPORATION (a Delaware Corporation) Effective as of January 3, 2025 AMERICAN TOWER CORPORATION (a Delaware Corporation) AMENDED AND RESTATED BY-LAWS TABLE OF CONTENTS Page ARTICLE I OFFICES 1 SECTION 1. Registered Office 1 SECTION 2. Other Offices 1 ARTICLE II SEAL 1 ARTICLE III MEETINGS OF STOCKHOLDERS 1 SECTION 1. Place of Meeting

AMERICAN TOWER NAMES BUD NOEL AS COO AND RICH ROSSI AS EVP AND PRESIDENT, U.S. TOWER

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER NAMES BUD NOEL AS COO AND RICH ROSSI AS EVP AND PRESIDENT, U.S. TOWER Boston, Massachusetts – January 7, 2025 – American Tower Corporation (NYSE: AMT) announced today that Eugene (“Bud”) Noel, currently Executive Vice President and President of the U. S. Tower Division,

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): January 2, 2025 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission F

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — December 5, 2024 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors declared a quarterly cash distribution of $1.62 per share on shares of the Company’s common stock. The dist

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): December 5, 2024 AMERICAN TOWER CO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): December 5, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): November 21, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissio

Supplemental Indenture No. 7, dated as of November 21, 2024, by and between American Tower Corporation and U.S. Bank Trust Company, National Association, as trustee.

Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee SUPPLEMENTAL INDENTURE NO. 7 Dated as of November 21, 2024 to BASE INDENTURE Dated as of June 1, 2022 $1,200,000,000 Principal Amount $600,000,000 5.000% SENIOR NOTES DUE 2030 $600,000,000 5.400% SENIOR NOTES DUE 2035 TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 1 Sect

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): November 18, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $600,000,000 5.000% Senior Notes due 2030 $600,000,000 5.400% Senior Notes due 2035

Table of Contents Filed Pursuant to Rule 424b2 Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $1,200,000,000 American Tower Corporation $600,000,000 5.000% Senior Notes due 2030 $600,000,000 5.400% Senior Notes due 2035 We are offering $600,000,000 of 5.000% Senior Notes due 2030 (the “2030 notes”) and $600,000,000 of 5.400% Senior Notes due 2035 (the “2035 note

Calculation of Filing Fee Table American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 Calculation of Filing Fee Table 424(b)(2) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price(1) Fee Rate Amount of Registration Fee Fees to Be Paid Debt 5.

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - November 18, 2024 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2030 and 2035 in aggregate principal amounts of $600.0 mill

Final Term Sheet AMERICAN TOWER CORPORATION November 18, 2024 Issuer: American Tower Corporation (“AMT”) Coupon: 5.000% Senior Notes due 2030 (the “2030 Notes”) 5.400% Senior Notes due 2035 (the “2035 Notes”) Principal Amount: 2030 Notes: $600,000,00

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

SUBJECT TO COMPLETION, DATED NOVEMBER 18, 2024. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $     % Senior Notes due 2030 $     % Senior Notes due 2035

Table of Contents Filed Pursuant to Rule 424B5 Registration No. 333-265348 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED NOVEMBER 18, 2024. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $    American Tower Corporation $     % Senior Not

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): October 28, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended September 30, 2024. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name

AMERICAN TOWER CORPORATION REPORTS THIRD QUARTER 2024 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS THIRD QUARTER 2024 FINANCIAL RESULTS On September 12, 2024, American Tower Corporation (the “Company” or “American Tower”) completed the sale of 100% of the equity interests in its operations in India (“ATC TIPL” or “ATC India”) to Data Infrastructure Tru

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): October 29, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 12, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissio

AMERICAN TOWER CLOSES THE SALE OF OPERATIONS IN INDIA TO BROOKFIELD

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CLOSES THE SALE OF OPERATIONS IN INDIA TO BROOKFIELD Boston, Massachusetts – September 12, 2024 – American Tower Corporation (NYSE: AMT) (“American Tower”) today announced that it has closed the previously announced sale of 100% of the equity interests in its operations

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 12, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissio

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — September 12, 2024 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors declared a quarterly cash distribution of $1.62 per share on shares of the Company’s common stock. The di

AMERICAN TOWER CORPORATION REPORTS SECOND QUARTER 2024 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS SECOND QUARTER 2024 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS Second Quarter 2024(1) ● Total revenue increased 4.6% to $2,900 million ● Property revenue increased 4.6% to $2,853 million ● Net income increased 96.8% to $908 million(2)(3) ● Adjusted EBITDA

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): July 30, 2024 AMERICAN TOWER CORPO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): July 30, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended June 30, 2024. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name of r

Notice of Benchmark Replacement and Amendment No. 2, dated as of June 27, 2024, to the Third Amended and Restated Multicurrency Revolving Credit Agreement, among American Tower Corporation and certain of its subsidiaries as borrowers, Toronto Dominion (Texas) LLC, as administrative agent, and a majority of lenders under the Third Amended and Restated Multicurrency Revolving Credit Agreement, dated December 8, 2021, as further amended.

Exhibit 10.1 NOTICE OF BENCHMARK REPLACEMENT AND AMENDMENT NO. 2 TO THE CREDIT AGREEMENT Dated as of June 27, 2024 This NOTICE OF BENCHMARK REPLACEMENT AND AMENDMENT NO. 2 TO THE CREDIT AGREEMENT (this “Amendment”) is made between AMERICAN TOWER CORPORATION, a Delaware corporation (the “Company”) and TORONTO DOMINION (TEXAS) LLC, as administrative agent (the “Administrative Agent”) under the Credi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 29, 2024 AMERICAN TOWER CORPO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 29, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

Supplemental Indenture No. 6, dated as of May 29, 2024, by and among American Tower Corporation, U.S. Bank Trust Company, National Association, as trustee, and Elavon Financial Services DAC, UK Branch, as paying agent.

EX-4.1 Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee and Elavon Financial Services DAC, UK Branch As Paying Agent SUPPLEMENTAL INDENTURE NO. 6 Dated as of May 29, 2024 to BASE INDENTURE Dated as of June 1, 2022 €1,000,000,000 Principal Amount €500,000,000 3.900% SENIOR NOTES DUE 2030 €500,000,000 4.100% SENIOR NOTES DUE 2034 TABLE OF CONTENTS P

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 American Tower Corporation (Exact name of regis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 American Tower Corporation (Exact name of registrant as specified in its charter) Delaware 65-0723837 (State or other jurisdiction of incorporation or organization) (IRS Employer Identification No.

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — May 23, 2024 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors (the “Board”) declared a quarterly cash distribution of $1.62 per share on shares of the Company’s common stock. Th

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 22, 2024 AMERICAN TOWER CORPOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 22, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

Calculation of Filing Fee Table American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security  Type  Security Class Title Fee Calculation Amount Registered (1) Proposed Maximum Offerin

Exhibit 107 Calculation of Filing Fee Table 424(b)(2) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security  Type  Security Class Title Fee Calculation Amount Registered (1) Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price (2) Fee Rate Amount of Registration Fee Fees to Be Paid Debt  3.

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation €500,000,000 3.900% Senior Notes due 2030 €500,000,000 4.100% Senior Notes due 2034

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 €1,000,000,000 American Tower Corporation €500,000,000 3.900% Senior Notes due 2030 €500,000,000 4.100% Senior Notes due 2034 We are offering €500,000,000 of 3.900% Senior Notes due 2030 (the “2030 notes”) and €500,000,000 of 4.100% Senior Notes due 2034 (the “2034

Final Term Sheet AMERICAN TOWER CORPORATION May 22, 2024 Issuer: American Tower Corporation (“AMT”) Coupon: 3.900% Senior Notes due 2030 (the “2030 Notes”) 4.100% Senior Notes due 2034 (the “2034 Notes”) Principal Amount: 2030 Notes: €500,000,000 203

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - May 22, 2024 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2030 and 2034 in aggregate principal amounts of €500.0 million (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 22, 2024 AMERICAN TOWER CORPOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 22, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

SUBJECT TO COMPLETION, DATED MAY 22, 2024. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 €       American Tower Corporation €     % Senior Notes due 2030 €     % Senior Notes due 2034

424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-265348 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED MAY 22, 2024. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 €       American Tower Corporation €     % Se

AMERICAN TOWER CORPORATION REPORTS FIRST QUARTER 2024 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations and FP&A Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS FIRST QUARTER 2024 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS First Quarter 2024 ● Total revenue increased 2.4% to $2,834 million ● Property revenue increased 3.3% to $2,804 million ● Net income increased 192.6% to $922 million(1)(2)(3) ● Adjusted EBITDA i

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended March 31, 2024. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name of

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): April 30, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

Notice of Exempt Solicitation

PX14A6G 1 z416146px14a6g.htm Notice of Exempt Solicitation NAME OF REGISTRANT: American Tower Corporation NAME OF PERSONS RELYING ON EXEMPTION: Arjuna Capital ADDRESS OF PERSON RELYING ON EXEMPTION: 13 Elm St. Manchester, MA 01944 WRITTEN MATERIALS: The attached written materials are submitted pursuant to Rule 14a-6(g)(1) (the “Rule”) promulgated under the Securities Exchange Act of 1934,* in conn

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Ame

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement. ☐ Confid

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Ame

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement. ☐ Confid

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 11, 2024 AMERICAN TOWER CORP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 11, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

Form of Notice of Grant of Performance-Based Restricted Stock Units Agreement (U.S. Employee) (For grants made beginning February 28, 2024) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.1 American Tower Corporation Notice of Grant of Performance-Based Restricted Stock Units and PSU Agreement (U.S. Employee) ([Position]) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: PSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “C

AMERICAN TOWER CORPORATION ANNOUNCES ELECTION OF NEVILLE R. RAY TO BOARD OF DIRECTORS AND DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION ANNOUNCES ELECTION OF NEVILLE R. RAY TO BOARD OF DIRECTORS AND DECLARES QUARTERLY DISTRIBUTION Boston, Massachusetts — March 14, 2024 — American Tower Corporation (NYSE: AMT) announced that its Board of Directors (the “Board”) has elected Neville R. Ray as a director. Mr.

Form of Notice of Grant of Performance-Based Restricted Stock Units Agreement (Non-U.S. Employee) (For grants made beginning February 28, 2024) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.2 American Tower Corporation Notice of Grant of Performance-Based Restricted Stock Units and PSU Agreement (Non-U.S. Employee) ([Position]) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: PSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (th

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 7, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

Supplemental Indenture No. 5, dated as of March 7, 2024, by and between American Tower Corporation and U.S. Bank Trust Company, National Association, as trustee.

Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee SUPPLEMENTAL INDENTURE NO. 5 Dated as of March 7, 2024 to BASE INDENTURE Dated as of June 1, 2022 $1,300,000,000 Principal Amount $650,000,000 5.200% SENIOR NOTES DUE 2029 $650,000,000 5.450% SENIOR NOTES DUE 2034 TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 1 Section

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $650,000,000 5.200% Senior Notes due 2029 $650,000,000 5.450% Senior Notes due 2034

Table of Contents Filed Pursuant to Rule 424B2 Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $1,300,000,000 American Tower Corporation $650,000,000 5.200% Senior Notes due 2029 $650,000,000 5.450% Senior Notes due 2034 We are offering $650,000,000 of 5.200% Senior Notes due 2029 (the “2029 notes”) and $650,000,000 of 5.450% Senior Notes due 2034 (the “2034 note

Calculation of Filing Fee Table American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security  Type  Security Class Title Fee Calculation Amount Registered Proposed Maximum Offering Pr

Exhibit 107 Calculation of Filing Fee Table 424(b)(2) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security  Type  Security Class Title Fee Calculation Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price(1) Fee Rate Amount of Registration Fee Fees to Be Paid Debt 5.

SUBJECT TO COMPLETION, DATED MARCH 4, 2024. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $     % Senior Notes due 2029 $     % Senior Notes due 2034

Table of Contents Filed Pursuant to Rule 424B5 Registration No. 333-265348 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED MARCH 4, 2024. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $    American Tower Corporation $     % Senior Notes d

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - March 4, 2024 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2029 and 2034 in aggregate principal amounts of $650.0 million and $650.

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 4, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

Final Term Sheet AMERICAN TOWER CORPORATION March 4, 2024 Issuer: American Tower Corporation (“AMT”) Coupon: 5.200% Senior Notes due 2029 (the “2029 Notes”) 5.450% Senior Notes due 2034 (the “2034 Notes”) Principal Amount: 2029 Notes: $650,000,000 20

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 28, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 27, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Description of Registrant’s Securities

Exhibit 4.32 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 As of February 20, 2024, American Tower Corporation has ten classes of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): (1) our common stock; (2) our 1.375% senior notes due 2025 (the “1.375% Notes”); (3) our

American Tower Corporation Compensation Recovery Policy

Exhibit 97 AMERICAN TOWER CORPORATION COMPENSATION RECOVERY POLICY 1. Purpose. This Policy (defined in Section 3) describes the circumstances in which each Executive Officer (defined in Section 3) must repay or return Erroneously Awarded Compensation (defined in Section 3) to members of the Company Group (defined in Section 3) in accordance with the Clawback Rules (defined in Section 3). Each Exec

Form of Restricted Stock Units Agreement (Non-U.S. Employee) (For grants made beginning January 1, 2024) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.15 American Tower Corporation Notice of Grant of Restricted Stock Units and RSU Agreement (Non-U.S. Employee / Time) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: RSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), hereby gr

Letter Agreement, dated as of February 5, 2024, by and between the Company and Steven O. Vondran

Exhibit 10.31 February 5, 2024 Steven O. Vondran Dear Steve: Congratulations on your promotion to Chief Executive Officer and President effective February 1, 2024. As discussed, your promotion is contingent on a clear background check completed by our external vendor. This is an exempt position, and your new annual rate of base compensation will be $1,000,000. With your promotion, your target bonu

Letter Agreement, dated as of October 25, 2023, by and between the Company and Eugene M. Noel

Exhibit 10.30 October 25, 2023 Eugene Noel Dear Bud: I am pleased to confirm your promotion to Executive Vice President and President, U.S. Tower effective November 1, 2023. In this position you will be reporting to Steve Vondran, Executive Vice President and Chief Operating Officer. This is an exempt position, and your new annual rate of base compensation will be $600,000. Your weekly hours worke

American Tower Corporation Severance Plan, as Amended and Restated, as of January 1, 2024

Exhibit 10.28 AMERICAN TOWER CORPORATION SEVERANCE PLAN First Effective as of March 2, 2009 As Amended and Restated January 1, 2024 ARTICLE 1 PURPOSE 1.1.  Plan Overview: American Tower Corporation (the “Company”) first adopted this American Tower Corporation Severance Plan (the “Severance Plan” or the “Plan”) effective as of March 2, 2009 (the “Original Effective Date”) as part of the American To

Subsidiaries of the Company

Exhibit 21 SUBSIDIARIES OF AMERICAN TOWER CORPORATION Subsidiary Jurisdiction of Incorporation or Organization 10 Presidential Way Associates, LLC Delaware 52 Eighty Partners, LLC Delaware 52 Eighty Tower Partners I, LLC Delaware ACC Tower Sub, LLC Delaware ActiveX Telebroadband Services Private Limited India Adquisiciones y Proyectos Inalámbricos, S.

Form of Restricted Stock Units Agreement (U.S. Employee) (For grants made beginning January 1, 2024) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.14 American Tower Corporation Notice of Grant of Restricted Stock Units and RSU Agreement (U.S. Employee / Time) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: RSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), hereby grants

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One): ☒ Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the fiscal year ended December 31, 2023 ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the transition period from to Commission File Number: 001-14

American Tower Corporation Severance Plan, Program for Executive Vice Presidents and Chief Executive Officer, as of January 1, 2024

Exhibit 10.29 AMERICAN TOWER CORPORATION SEVERANCE PLAN PROGRAM FOR EXECUTIVE VICE PRESIDENTS AND CHIEF EXECUTIVE OFFICERS AS OF JANUARY 1, 2024 1. PURPOSE This Program specifies the benefits available to certain employees of American Tower Corporation and its affiliates in the event their job or position is eliminated. This document is a part of the American Tower Corporation Severance Plan, whic

AMERICAN TOWER CORPORATION REPORTS FOURTH QUARTER AND FULL YEAR 2023 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS FOURTH QUARTER AND FULL YEAR 2023 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS Fourth Quarter 2023 Full Year 2023 ● Total revenue increased 3.0% to $2,787 million ● Total revenue increased 4.0% to $11,144 million ● Property revenue increased 4.6% to $2,766 million ●

AMT / American Tower Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)* Name of issuer: American Tower Corp Title of Class of Securities: Common Stock CUSIP Number: 03027X100 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 5, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

AMERICAN TOWER COMPLETES STRATEGIC REVIEW, ANNOUNCES AGREEMENT TO SELL OPERATIONS IN INDIA TO BROOKFIELD

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER COMPLETES STRATEGIC REVIEW, ANNOUNCES AGREEMENT TO SELL OPERATIONS IN INDIA TO BROOKFIELD Boston, Massachusetts – January 4, 2024 – American Tower Corporation (NYSE: AMT) (“American Tower”) has signed a definitive agreement with Data Infrastructure Trust (“DIT”), an Infrastructur

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): January 4, 2024 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission F

Amended and Restated By-Laws of the Company, effective as of December 13, 2023

8-K Exhibit 3.1 AMENDED AND RESTATED BY-LAWS OF AMERICAN TOWER CORPORATION (a Delaware Corporation) Effective as of December 13, 2023 AMERICAN TOWER CORPORATION (a Delaware Corporation) AMENDED AND RESTATED BY-LAWS TABLE OF CONTENTS Page ARTICLE I OFFICES 1 SECTION 1. Registered Office 1 SECTION 2. Other Offices 1 ARTICLE II SEAL 1 ARTICLE III MEETINGS OF STOCKHOLDERS 1 SECTION 1. Place of Meeting

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): December 13, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION BOSTON, MASSACHUSETTS - December 14, 2023 - American Tower Corporation (NYSE: AMT) today announced that its board of directors has declared its quarterly cash distribution of $1.70 per share on shares of the Company’s common stock. The dist

EXPLANATORY NOTE

Filed Pursuant to Rule 424B5 and 424B8 Registration No. 333-265348 EXPLANATORY NOTE American Tower Corporation (the “Company”) is making this filing pursuant to Rule 424(b)(5) and Rule 424(b)(8) under the Securities Act of 1933, as amended (the “Securities Act”), as a supplement to its prospectus supplement dated September 12, 2023 to the prospectus dated June 1, 2022 (the “Original Filing”), orig

Calculation of Filing Fee Table 424(b)(5) & 424(b)(8) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 Calculation of Filing Fee Table 424(b)(5) & 424(b)(8) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price(1) Fee Rate(2) Amount of Registration Fee(2) Fees to Be Paid Debt 5.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended September 30, 2023. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name

Form of Restricted Stock Units Agreement (Non-U.S. Employee) (For grants made October 1, 2023 – December 31, 2023) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.2 American Tower Corporation Notice of Grant of Restricted Stock Units and RSU Agreement (Non-U.S. Employee / Time) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: RSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), hereby gra

Form of Restricted Stock Units Agreement (U.S. Employee) (For grants made October 1, 2023 – December 31, 2023) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.1 American Tower Corporation Notice of Grant of Restricted Stock Units and RSU Agreement (U.S. Employee / Time) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: RSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), hereby grants

Form of Notice of Grant of Performance-Based Restricted Stock Units Agreement (U.S. Employee) (For grants made beginning October 1, 2023) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.4 American Tower Corporation Notice of Grant of Performance-Based Restricted Stock Units and PSU Agreement (U.S. Employee) ([Position]) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: PSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “C

AMERICAN TOWER CORPORATION REPORTS THIRD QUARTER 2023 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS THIRD QUARTER 2023 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS Third Quarter 2023 ● Total revenue increased 5.5% to $2,819 million ● Property revenue increased 7.0% to $2,792 million ● Net income decreased 29.6% to $577 million(1)(2) ● Adjusted EBITDA increased 10.4

Form of Restricted Stock Units Agreement (Non-Employee Director) (For grants made beginning October 1, 2023) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.3 American Tower Corporation Notice of Grant of Restricted Stock Units and RSU Agreement (Non-Employee Director) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: RSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), hereby grants

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): October 26, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

Form of Notice of Grant of Performance-Based Restricted Stock Units Agreement (Non-U.S. Employee) (For grants made beginning October 1, 2023) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.5 American Tower Corporation Notice of Grant of Performance-Based Restricted Stock Units and PSU Agreement (Non-U.S. Employee) ([Position]) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: PSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (th

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION BOSTON, MASSACHUSETTS - September 20, 2023 - American Tower Corporation (NYSE: AMT) today announced that its board of directors has declared its quarterly cash distribution of $1.62 per share on shares of the Company’s common stock. The dis

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 20, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissio

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 15, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissi

Supplemental Indenture No. 4, dated as of September 15, 2023, to Indenture dated as of June 1, 2022, by and between American Tower Corporation and U.S. Bank Trust Company, National Association, as Trustee, for the 5.800% Senior Notes due 2028 and the 5.900% Senior Notes due 2033

EX-4.1 Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee SUPPLEMENTAL INDENTURE NO. 4 Dated as of September 15, 2023 to BASE INDENTURE Dated as of June 1, 2022 $1,500,000,000 Principal Amount $750,000,000 5.800% SENIOR NOTES DUE 2028 $750,000,000 5.900% SENIOR NOTES DUE 2033 TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENC

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $750,000,000 5.800% Senior Notes due 2028 $750,000,000 5.900% Senior Notes due 2033

Table of Contents Filed Pursuant to Rule 424B2 Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $1,500,000,000 American Tower Corporation $750,000,000 5.800% Senior Notes due 2028 $750,000,000 5.900% Senior Notes due 2033 We are offering $750,000,000 of 5.800% Senior Notes due 2028 (the “2028 notes”) and $750,000,000 of 5.900% Senior Notes due 2033 (the “2033 note

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 12, 2023 AMERICAN TOWER

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 12, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissio

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - September 12, 2023 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2028 and 2033 in aggregate principal amounts of $750.0 million and

Final Term Sheet AMERICAN TOWER CORPORATION September 12, 2023 Issuer: American Tower Corporation (“AMT”) Coupon: 5.800% Senior Notes due 2028 (the “2028 Notes”) 5.900% Senior Notes due 2033 (the “2033 Notes”) Principal Amount: 2028 Notes: $750,000,0

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

SUBJECT TO COMPLETION, DATED SEPTEMBER 12, 2023. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $ % Senior Notes due 2028 $ % Senior Notes due 2033

424B5 Table of Contents Filed Pursuant to Rule 424B5 Registration No. 333-265348 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED SEPTEMBER 12, 2023. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $ American Tower Corporation $ % Senior Not

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): July 27, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

Amendment No. 1 to the Third Amended and Restated Multicurrency Revolving Credit Agreement, dated as of June 29, 2023, among the Company and certain of its subsidiaries as borrowers, Toronto Dominion (Texas) LLC, as administrative agent, and a majority of lenders under the Third Amended and Restated Multicurrency Revolving Credit Agreement, dated as of December 8, 2021

HTML Exhibit 10.2 Execution Version AMENDMENT NO. 1 TO THE THIRD AMENDED AND RESTATED MULTICURRENCY REVOLVING CREDIT AGREEMENT Dated as of June 29, 2023 AMENDMENT NO. 1 TO THE THIRD AMENDED AND RESTATED MULTICURRENCY REVOLVING CREDIT AGREEMENT (this “Amendment”) by and among AMERICAN TOWER CORPORATION, a Delaware corporation (the “Company”), certain of the Company’s subsidiaries (together with the

Amendment No. 1 to the Second Amended and Restated Term Loan Agreement, dated as of June 29, 2023, among the Company, as borrower, Mizuho Bank, Ltd., as administrative agent, and a majority of the lenders under the Second Amended and Restated Term Loan Agreement, dated as of December 8, 2021

HTML Exhibit 10.1 Execution Version AMENDMENT NO. 1 TO THE SECOND AMENDED AND RESTATED TERM LOAN AGREEMENT Dated as of June 29, 2023 AMENDMENT NO. 1 TO THE SECOND AMENDED AND RESTATED TERM LOAN AGREEMENT (this “Amendment”) by and among AMERICAN TOWER CORPORATION, a Delaware corporation (the “Borrower”), the financial institutions party hereto (collectively, the “Lenders”), and MIZUHO BANK, LTD., a

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended June 30, 2023. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name of r

Amendment No. 1 to the Fourth Amended and Restated Revolving Credit Agreement, dated as of June 29, 2023, among the Company and certain of its subsidiaries as borrowers, Toronto Dominion (Texas) LLC, as administrative agent, and a majority of lenders under the Fourth Amended and Restated Revolving Credit Agreement, dated as of December 8, 2021

HTML Exhibit 10.3 Execution Version AMENDMENT NO. 1 TO THE FOURTH AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT Dated as of June 29, 2023 AMENDMENT NO. 1 TO THE FOURTH AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT (this “Amendment”) by and among AMERICAN TOWER CORPORATION, a Delaware corporation (the “Borrower”), the financial institutions party hereto (collectively, the “Lenders”), and TORONT

AMERICAN TOWER CORPORATION REPORTS SECOND QUARTER 2023 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS SECOND QUARTER 2023 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS Second Quarter 2023 ● Total revenue increased 3.6% to $2,772 million ● Property revenue increased 4.4% to $2,729 million ● Net income decreased 48.2% to $462 million(1) ● Adjusted EBITDA increased 4.7%

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): July 20, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

AMERICAN TOWER CORPORATION RELEASES 2022 SUSTAINABILITY REPORT

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION RELEASES 2022 SUSTAINABILITY REPORT Boston, Massachusetts – July 20, 2023 – American Tower Corporation (NYSE: AMT) today announced the release of its 2022 sustainability report, which outlines the Company's sustainability strategy and provides a comprehensive overview

Entry into a Material Definitive Agreement, Termination of a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): June 27, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 25, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION BOSTON, MASSACHUSETTS - May 25, 2023 - American Tower Corporation (NYSE: AMT) today announced that its board of directors has declared its quarterly cash distribution of $1.57 per share on shares of the Company’s common stock. The distribut

Supplemental Indenture No. 3, dated as of May 25, 2023, to Indenture dated as of June 1, 2022, by and between American Tower Corporation and U.S. Bank Trust Company, National Association, as Trustee, for the 5.250% Senior Notes due 2028 and the 5.550% Senior Notes due 2033

EX-4.1 Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee SUPPLEMENTAL INDENTURE NO. 3 Dated as of May 25, 2023 to BASE INDENTURE Dated as of June 1, 2022 $1,500,000,000 Principal Amount $650,000,000 5.250% SENIOR NOTES DUE 2028 $850,000,000 5.550% SENIOR NOTES DUE 2033 TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 1 Se

Financial Statements and Exhibits, Other Events, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 24, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $650,000,000 5.250% Senior Notes due 2028 $850,000,000 5.550% Senior Notes due 2033

Table of Contents Filed Pursuant to Rule 424B2 Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $1,500,000,000 American Tower Corporation $650,000,000 5.250% Senior Notes due 2028 $850,000,000 5.550% Senior Notes due 2033 We are offering $650,000,000 of 5.250% Senior Notes due 2028 (the “2028 notes”) and $850,000,000 of 5.550% Senior Notes due 2033 (the “2033 note

CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to be Registered Amount to be Registered Maximum Offering Price Per Unit Maximum Aggregate Offering Price Amount of Registration Fee (1) 5.250% Senior Notes due 2028 $650,000,000 99.71

EX-FILING FEES Exhibit 107 CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to be Registered Amount to be Registered Maximum Offering Price Per Unit Maximum Aggregate Offering Price Amount of Registration Fee (1) 5.

SUBJECT TO COMPLETION, DATED MAY 22, 2023. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $ % Senior Notes due 2028 $ % Senior Notes due 2033

Table of Contents Filed Pursuant to Rule 424B5 Registration No. 333-265348 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED MAY 22, 2023. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $ American Tower Corporation $ % Senior Notes due 2028

Final Term Sheet AMERICAN TOWER CORPORATION May 22, 2023 Issuer: American Tower Corporation (“AMT”) Coupon: 5.250% Senior Notes due 2028 (the “2028 Notes”) 5.550% Senior Notes due 2033 (the “2033 Notes”) Principal Amount: 2028 Notes: $650,000,000 203

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 22, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - May 22, 2023 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2028 and 2033 in aggregate principal amounts of $650.0 million and $850.0

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 16, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 American Tower Corporation (Exact name of regis

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) or (g) OF THE SECURITIES EXCHANGE ACT OF 1934 American Tower Corporation (Exact name of registrant as specified in its charter) Delaware 65-0723837 (State or other jurisdiction of incorporation or organization) (IRS Employer Identification No.

Supplemental Indenture No. 2, dated as of May 16, 2023, to Indenture dated as of June 1, 2022 by and among the Company, U.S. Bank Trust Company, National Association, as Trustee, and Elavon Financial Services DAC, UK Branch, as Paying Agent, for the 4.125% Senior Notes due 2027 and the 4.625% Senior Notes due 2031

EX-4.1 Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee and Elavon Financial Services DAC, UK Branch As Paying Agent SUPPLEMENTAL INDENTURE NO. 2 Dated as of May 16, 2023 to BASE INDENTURE Dated as of June 1, 2022 €1,100,000,000 Principal Amount €600,000,000 4.125% SENIOR NOTES DUE 2027 €500,000,000 4.625% SENIOR NOTES DUE 2031 TABLE OF CONTENTS P

CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to be Registered Amount to be Registered (1) Maximum Offering Price Per Unit Maximum Aggregate Offering Price Amount of Registration Fee (2) 4.125% Senior Notes due 2027 $660,240,000 9

EX-FILING FEES Exhibit 107 CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to be Registered Amount to be Registered (1) Maximum Offering Price Per Unit Maximum Aggregate Offering Price Amount of Registration Fee (2) 4.

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation €600,000,000 4.125% Senior Notes due 2027 €500,000,000 4.625% Senior Notes due 2031

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 €1,100,000,000 American Tower Corporation €600,000,000 4.125% Senior Notes due 2027 €500,000,000 4.625% Senior Notes due 2031 We are offering €600,000,000 of 4.125% Senior Notes due 2027 (the “2027 notes”) and €500,000,000 of 4.625% Senior Notes due 2031 (the “2031

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - May 9, 2023 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2027 and 2031 in aggregate principal amounts of €600.0 million (approximat

Final Term Sheet AMERICAN TOWER CORPORATION May 9, 2023 Issuer: American Tower Corporation (“AMT”) Coupon: 4.125% Senior Notes due 2027 (the “2027 Notes”) 4.625% Senior Notes due 2031 (the “2031 Notes”) Principal Amount: 2027 Notes: €600,000,000 2031

Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

SUBJECT TO COMPLETION, DATED MAY 9, 2023. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation € % Senior Notes due 2027 € % Senior Notes due 2031

Table of Contents This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 9, 2023 AMERICAN TOWER CORPORA

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 9, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended March 31, 2023. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name of

First Amendment dated as of March 13, 2023 to the Second Amended and Restated Cash Management Agreement dated as of March 29, 2018, by and among American Tower Asset Sub, LLC, American Tower Asset Sub II, LLC, the Borrowers party thereto, U.S. Bank Trust Company, National Association, as Trustee for American Tower Trust I Secured Tower Revenue Securities as Lender, Midland Loan Services, a Division of PNC Bank, National Association, as Servicer, U.S. Bank National Association, as Agent, and Spectrasite Communications, LLC, as Manager

HTML Exhibit 10.2 EXECUTION VERSION FIRST AMENDMENT TO SECOND AMENDED AND RESTATED CASH MANAGEMENT AGREEMENT among AMERICAN TOWER ASSET SUB, LLC AMERICAN TOWER ASSET SUB II, LLC AND ANY OTHER BORROWER OR BORROWERS THAT MAY BECOME A PARTY THERETO as Borrowers, U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee for American Tower Trust I Secured Tower Revenue Securities as Lender, MIDLAND LOA

Second Supplement and Amendment dated as of March 13, 2023 to the Second Amended and Restated Loan and Security Agreement dated as of March 29, 2018, by and among American Tower Asset Sub, LLC and American Tower Asset Sub II, LLC, as Borrowers, and U.S. Bank Trust Company, National Association, as Trustee for American Tower Trust I Secured Tower Revenue Securities as Lender

HTML Exhibit 10.1 EXECUTION VERSION SECOND SUPPLEMENT AND AMENDMENT TO SECOND AMENDED AND RESTATED LOAN AND SECURITY AGREEMENT between AMERICAN TOWER ASSET SUB, LLC, AMERICAN TOWER ASSET SUB II, LLC, as Borrowers and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee for American Tower Trust I Secured Tower Revenue Securities, as Lender dated as of March 13, 2023 Secured Tower Revenue Secur

AMERICAN TOWER CORPORATION REPORTS FIRST QUARTER 2023 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS FIRST QUARTER 2023 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS First Quarter 2023 ● Total revenue increased 4.0% to $2,767 million ● Property revenue increased 4.4% to $2,715 million ● Net income decreased 55.2% to $315 million(1)(2) ● Adjusted EBITDA increased 8.6%

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): April 26, 2023 AMERICAN TOWER CORP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): April 26, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

Second Trust Agreement Supplement and Amendment dated as of March 13, 2023 to Second Amended and Restated Trust and Servicing Agreement dated as of March 29, 2018, by and among American Tower Depositor Sub, LLC, as Depositor, Midland Loan Services, a Division of PNC Bank, National Association, as Servicer, and U.S. Bank Trust Company, National Association, as Trustee

HTML Exhibit 10.3 EXECUTION VERSION SECOND TRUST AGREEMENT SUPPLEMENT AND AMENDMENT TO SECOND AMENDED AND RESTATED TRUST AND SERVICING AGREEMENT among AMERICAN TOWER DEPOSITOR SUB, LLC, as Depositor, MIDLAND LOAN SERVICES, A DIVISION OF PNC BANK, NATIONAL ASSOCIATION, as Servicer, and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee dated as of March 13, 2023 TABLE OF CONTENTS Page ARTICL

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Ame

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement. ☐ Confid

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Ame

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement. ☐ Confid

* * * *

March 31, 2023 VIA EDGAR AND BY MAIL United States Securities and Exchange Commission Division of Corporation Finance Office of Real Estate & Construction 100 F Street, N.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 28, 2023 AMERICAN TOWER CORP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 28, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

March 28, 2023

March 28, 2023 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance Office of Real Estate & Construction 100 F Street, N.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 13, 2023 AMERICAN TOWER CORP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 13, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 8, 2023 AMERICAN TOWER CORPO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 8, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION BOSTON, MASSACHUSETTS - March 9, 2023 - American Tower Corporation (NYSE: AMT) today announced that its board of directors has declared its quarterly cash distribution of $1.56 per share on shares of the Company’s common stock. The distribu

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 8, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

AMERICAN TOWER CORPORATION ANNOUNCES PRICING OF SECURITIES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION ANNOUNCES PRICING OF SECURITIES OFFERING BOSTON, MASSACHUSETTS - March 8, 2023 - American Tower Corporation (NYSE: AMT) (the “Company”) today announced that certain of its indirect subsidiaries priced, in a private transaction, $1.3 billion aggregate principal amount of S

Supplemental Indenture No. 1, dated as of March 3, 2023, to Indenture dated as of June 1, 2022, by and between American Tower Corporation and U.S. Bank Trust Company, National Association, as Trustee, for the 5.500% Senior Notes due 2028 and the 5.650% Senior Notes due 2033

EX-4.1 Exhibit 4.1 AMERICAN TOWER CORPORATION and U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION as Trustee SUPPLEMENTAL INDENTURE NO. 1 Dated as of March 3, 2023 to BASE INDENTURE Dated as of June 1, 2022 $1,500,000,000 Principal Amount $700,000,000 5.500% SENIOR NOTES DUE 2028 $800,000,000 5.650% SENIOR NOTES DUE 2033 TABLE OF CONTENTS Page Article I DEFINITIONS AND INCORPORATION BY REFERENCE 1 S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 3, 2023 AMERICAN TOWER CORP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): March 3, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 24, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to be Registered Amount to be Registered Maximum Offering Price Per Unit Maximum Aggregate Offering Price Amount of Registration Fee (1) 5.500% Senior Notes due 2028 $700,000,000 99.69

EX-FILING FEES Exhibit 107 CALCULATION OF REGISTRATION FEE Title of Each Class of Securities to be Registered Amount to be Registered Maximum Offering Price Per Unit Maximum Aggregate Offering Price Amount of Registration Fee (1) 5.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 28, 2023 AMERICAN TOWER C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 28, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $700,000,000 5.500% Senior Notes due 2028 $800,000,000 5.650% Senior Notes due 2033

Table of Contents Filed Pursuant to Rule 424(B)(2) Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $1,500,000,000 American Tower Corporation $700,000,000 5.500% Senior Notes due 2028 $800,000,000 5.650% Senior Notes due 2033 We are offering $700,000,000 of 5.500% Senior Notes due 2028 (the “2028 notes”) and $800,000,000 of 5.650% Senior Notes due 2033 (the “2033

AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES SENIOR NOTES OFFERING BOSTON, MASSACHUSETTS - February 28, 2023 - American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of senior unsecured notes due 2028 and 2033 in aggregate principal amounts of $700.0 million and $

SUBJECT TO COMPLETION, DATED FEBRUARY 28, 2023. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 American Tower Corporation $ % Senior Notes due 2028 $ % Senior Notes due 2033

424B5 Table of Contents Filed Pursuant to Rule 424B5 Registration No. 333-265348 This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. SUBJECT TO COMPLETION, DATED FEBRUARY 28, 2023. PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 $ American Tower Corporation $ % Senior Note

Final Term Sheet AMERICAN TOWER CORPORATION February 28, 2023 Issuer: American Tower Corporation (“AMT”) Coupon: 5.500% Senior Notes due 2028 (the “2028 Notes”) 5.650% Senior Notes due 2033 (the “2033 Notes”) Principal Amount: 2028 Notes: $700,000,00

FWP Issuer Free Writing Prospectus Filed pursuant to Rule 433 Registration Statement No.

Letter Agreement, dated as of October 2, 2022, by and between the Company and Ruth T. Dowling

Exhibit 10.21 October 2, 2022 Ruth Dowling Dear Ruth: I am pleased to confirm your promotion to Executive Vice President, Chief Administrative Officer, General Counsel and Secretary effective January 1, 2023. In this position you will be reporting to Tom Bartlett, President and Chief Executive Officer and will be based in our Corporate office in Boston. It is understood that our offer is contingen

Description of Registrant’s Securities

Exhibit 4.31 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 As of February 16, 2023, American Tower Corporation has ten classes of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): (1) our common stock; (2) our 1.375% senior notes due 2025 (the “1.375% Notes”); (3) our

Form 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One): ☒ Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the fiscal year ended December 31, 2022 ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the transition period from to Commission File Number: 001-14

Form of Restricted Stock Unit Agreement (Non-Employee Director) (For grants made beginning December 5, 2022) Pursuant to the American Tower Corporation 2007 Equity Incentive Plan, as amended

Exhibit 10.9 American Tower Corporation Notice of Grant of Restricted Stock Units and RSU Agreement (Non-Employee Director) American Tower Corporation ID: 65-0723837 116 Huntington Ave Boston, MA 02116 Administrator 116 Huntington Avenue 11th Floor Boston MA United States 02116 Participant Name: PSU Number: Plan: ID: American Tower Corporation, a Delaware corporation (the “Company”), hereby grants

Subsidiaries of the Company

Exhibit 21 SUBSIDIARIES OF AMERICAN TOWER CORPORATION Subsidiary Jurisdiction of Incorporation or Organization 10 Presidential Way Associates, LLC Delaware 4383335 Nova Scotia Company Nova Scotia 52 Eighty Partners, LLC Delaware 52 Eighty Tower Partners I, LLC Delaware ACC Tower Sub, LLC Delaware ActiveX Telebroadband Services Private Limited India Adquisiciones y Proyectos Inalámbricos, S.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 23, 2023 AMERICAN TOWER C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): February 23, 2023 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

AMERICAN TOWER CORPORATION REPORTS FOURTH QUARTER AND FULL YEAR 2022 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS FOURTH QUARTER AND FULL YEAR 2022 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS Fourth Quarter 2022 Full Year 2022 ● Total revenue increased 10.6% to $2,705 million ● Total revenue increased 14.5% to $10,711 million ● Property revenue increased 11.2% to $2,645 million

AMT / American Tower Corp / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv0239-americantowercorp.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9)* Name of issuer: American Tower Corp. Title of Class of Securities: REIT CUSIP Number: 03027X100 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate the

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): December 8, 2022 AMERICAN TOWER CO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): December 8, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION BOSTON, MASSACHUSETTS - December 8, 2022 - American Tower Corporation (NYSE: AMT) today announced that its board of directors has declared its quarterly cash distribution of $1.56 per share on shares of the Company’s common stock. The distr

AMERICAN TOWER CORPORATION REPORTS THIRD QUARTER 2022 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS THIRD QUARTER 2022 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS Third Quarter 2022 ? Total revenue increased 8.8% to $2,672 million ? Property revenue increased 10.2% to $2,610 million ? Net income increased 12.9% to $820 million ? Adjusted EBITDA increased 5.8% to $

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ☒ Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended September 30, 2022. ☐ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): October 27, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

AMERICAN TOWER CORPORATION ANNOUNCES MANAGEMENT CHANGES

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION ANNOUNCES MANAGEMENT CHANGES Boston, Massachusetts ? October 3, 2022 - American Tower Corporation (NYSE: AMT) today announced changes to its senior management team. Ed DiSanto intends to step down from his position as Executive Vice President, Chief Administrative Officer

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): October 2, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION BOSTON, MASSACHUSETTS - September 22, 2022 - American Tower Corporation (NYSE: AMT) today announced that its board of directors has declared its quarterly cash distribution of $1.47 per share on shares of the Company?s common stock. The dis

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): September 22, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commissio

AMERICAN TOWER AND VERIZON ANNOUNCE NEW LONG-TERM AGREEMENT

EX-99.1 2 exhibit9912022vzmla.htm EX-99.1 Exhibit 99.1 AMERICAN TOWER AND VERIZON ANNOUNCE NEW LONG-TERM AGREEMENT Boston, Massachusetts and New York, New York – August 31, 2022 – American Tower Corporation (NYSE: AMT) and Verizon Communications Inc. (NYSE, Nasdaq: VZ) announced today that they have signed a new overarching lease agreement, facilitating Verizon’s on-going 5G network deployment acr

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): August 31, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission F

Termination of a Material Definitive Agreement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): August 11, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission F

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): August 8, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): July 28, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ? Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended June 30, 2022. ? Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name of r

AMERICAN TOWER CORPORATION REPORTS SECOND QUARTER 2022 FINANCIAL RESULTS

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION REPORTS SECOND QUARTER 2022 FINANCIAL RESULTS CONSOLIDATED HIGHLIGHTS Second Quarter 2022 ? Total revenue increased 16.3% to $2,674 million ? Property revenue increased 17.1% to $2,615 million ? Net income increased 19.1% to $891 million ? Adjusted EBITDA increased 13.2%

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): July 21, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

AMERICAN TOWER CORPORATION RELEASES 2021 SUSTAINABILITY REPORT

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION RELEASES 2021 SUSTAINABILITY REPORT Boston, Massachusetts ? July 21, 2022 ? American Tower Corporation (NYSE: AMT) today announced the release of its 2021 sustainability report. The report outlines the Company?s sustainability strategy which is built upon three core p

AMERICAN TOWER PARTNERS WITH STONEPEAK IN U.S. DATA CENTER BUSINESS

Exhibit 99.1 AMERICAN TOWER PARTNERS WITH STONEPEAK IN U.S. DATA CENTER BUSINESS Boston, Massachusetts and New York City, New York ? July 11, 2022 ? American Tower Corporation (NYSE: AMT) and Stonepeak, a leading alternative investment firm specializing in infrastructure and real assets, today announced that Stonepeak, on behalf of certain affiliated investment vehicles, will acquire an ownership

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): July 11, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

Underwriting Agreement relating to the Common Stock, dated June 2, 2022, among American Tower Corporation, J.P. Morgan Securities LLC, Citigroup Global Markets Inc., Mizuho Securities USA LLC, Morgan Stanley & Co. LLC and TD Securities (USA) LLC as representatives of the underwriters.

EX-1.1 2 d368863dex11.htm EX-1.1 Exhibit 1.1 8,350,000 Shares AMERICAN TOWER CORPORATION Common Stock, par value $0.01 per share UNDERWRITING AGREEMENT June 2, 2022 J.P. Morgan Securities LLC Citigroup Global Markets Inc. Mizuho Securities USA LLC Morgan Stanley & Co. LLC TD Securities (USA) LLC Underwriting Agreement June 2, 2022 J.P. Morgan Securities LLC Citigroup Global Markets Inc. Mizuho Sec

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): June 2, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 8,350,000 Shares American Tower Corporation Common Stock

Table of Contents Filed Pursuant to Rule 424(b)(2) Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 8,350,000 Shares American Tower Corporation Common Stock We are offering 8,350,000 shares of our common stock, par value $0.01 per share (our ?Common Stock?). We have granted the underwriters the option to purchase up to an additional 835,000 shares of our Common St

Calculation of Filing Fee Tables FORM 424(B)(2) (Form Type) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

EX-FILING FEES 2 d366024dexfilingfees.htm EX-FILING FEES EXHIBIT 107 Calculation of Filing Fee Tables FORM 424(B)(2) (Form Type) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities The prospectus supplement to which this Exhibit is attached is a final prospectus for the related offering. The maximum aggregate offering price of that

AMERICAN TOWER CORPORATION PRICES PUBLIC OFFERING OF COMMON STOCK

Exhibit 99.2 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION PRICES PUBLIC OFFERING OF COMMON STOCK BOSTON, MASSACHUSETTS ? June 2, 2022 ? American Tower Corporation (NYSE: AMT) today announced the pricing of its registered public offering of 8,350,000 shares of common stock at $256.00 per share. The underwriters of the offering ha

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): June 2, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

AMERICAN TOWER CORPORATION ANNOUNCES PROPOSED PUBLIC OFFERING OF COMMON STOCK

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION ANNOUNCES PROPOSED PUBLIC OFFERING OF COMMON STOCK BOSTON, MASSACHUSETTS ? June 2, 2022 ? American Tower Corporation (NYSE: AMT) today announced that, in connection with the funding of its acquisition of CoreSite Realty Corporation (?CoreSite?), which closed in December 2

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): June 2, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fil

SUBJECT TO COMPLETION, DATED JUNE 2, 2022.

424B5 1 d366024d424b5.htm 424B5 Table of Contents SUBJECT TO COMPLETION, DATED JUNE 2, 2022. This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. Filed Pursuant to Rule 424(b)(5) Registration No. 333-265348 PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2022 8,350,000 Shares Am

As filed with the Securities and Exchange Commission on June 1, 2022.

Table of Contents As filed with the Securities and Exchange Commission on June 1, 2022.

Form of Underwriting Agreement for non-convertible debt securities.

Exhibit 1.1 [Principal Amount] AMERICAN TOWER CORPORATION [Title of Securities] UNDERWRITING AGREEMENT [Date] To the Representatives of the Several Underwriters named in Schedule A hereto, Dear Ladies and Gentlemen: 1. Introductory. American Tower Corporation, a Delaware corporation (the ?Company?), subject to the terms and conditions set forth herein, agrees with the several Underwriters named in

Indenture dated as of June 1, 2022, by and between the Company and U.S. Bank Trust Company, National Association, as Trustee

Exhibit 4.32 AMERICAN TOWER CORPORATION INDENTURE Dated as of June 1, 2022 U.S. Bank Trust Company, National Association Trustee ARTICLE 1 DEFINITIONS 1 SECTION 1.01 Certain Terms Defined 1 ARTICLE 2 SECURITY FORMS 4 SECTION 2.01 Forms Generally 4 SECTION 2.02 Form of Trustee?s Certificate of Authentication 8 ARTICLE 3 ISSUE, EXECUTION, FORM AND REGISTRATION OF SECURITIES 9 SECTION 3.01 Amount Unl

Filing Fee Exhibit

EXHIBIT 107 Calculation of Filing Fee Tables FORM S-3 (Form Type) American Tower Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Newly Registered Securities Fees to Be Paid Equity Common Stock, par value $0.

Form of Subordinated Indenture between American Tower Corporation and U.S. Bank National Association, as Trustee.

Exhibit 4.34 AMERICAN TOWER CORPORATION SUBORDINATED INDENTURE Dated as of [ ], 20[ ] [ ] Trustee Article I DEFINITIONS 1 SECTION 1.01. Certain Terms Defined 1 Article II SECURITY FORMS 6 SECTION 2.01. Forms Generally 6 SECTION 2.02. Form of Trustee?s Certificate of Authentication 7 Article III ISSUE, EXECUTION, FORM AND REGISTRATION OF SECURITIES 7 SECTION 3.01. Amount Unlimited; Issuable in Seri

Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939, as amended, of U.S. Bank Trust Company, National Association, as trustee under the Indenture dated June 1, 2022.

Exhibit 25.1 SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ? Check if an Application to Determine Eligibility of a Trustee Pursuant to Section 305(b)(2) U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION (Exact name of Trustee as specified in its charter) 91-1821036 I.R.S. E

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 23, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

AMERICAN TOWER CORPORATION JOINS THE UNITED NATIONS GLOBAL COMPACT AND ADOPTS THE UNITED NATIONS WOMEN’S EMPOWERMENT PRINCIPLES

Exhibit 99.1 ATC Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION JOINS THE UNITED NATIONS GLOBAL COMPACT AND ADOPTS THE UNITED NATIONS WOMEN’S EMPOWERMENT PRINCIPLES Boston, Massachusetts – May 23, 2022 – American Tower Corporation (NYSE: AMT) announced today it has joined the United Nations Global Compact (UNGC), through which mor

AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION

Exhibit 99.1 Contact: Adam Smith Senior Vice President, Investor Relations Telephone: (617) 375-7500 AMERICAN TOWER CORPORATION DECLARES QUARTERLY DISTRIBUTION BOSTON, MASSACHUSETTS - May 19, 2022 - American Tower Corporation (NYSE: AMT) today announced that its board of directors has declared its quarterly cash distribution of $1.43 per share on shares of the Company?s common stock. The distribut

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 18, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission File

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): April 27, 2022 AMERICAN TOWER CORPORATION (Exact Name of Registrant as Specified in Charter) Delaware 001-14195 65-0723837 (State or Other Jurisdiction of Incorporation) (Commission Fi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One): ? Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. For the quarterly period ended March 31, 2022. ? Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Commission File Number: 001-14195 AMERICAN TOWER CORPORATION (Exact name of