BlackRock, Inc. ownership in AMT / American Tower Corporation

American Tower Corporation

US ˙ NYSE ˙ US03027X1000

Security	AMT / American Tower Corporation
Institution	BlackRock, Inc.
Latest Disclosed Ownership	43,047,962 shares
Ownership	9.20%

2025-02-05 - BlackRock, Inc. has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 43,047,962 shares of American Tower Corporation (US:AMT). This represents 9.2 percent ownership of the company. In their previous filing dated 2024-01-26 , BlackRock, Inc. had reported owning 36,781,145 shares, indicating an increase of 17.04 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File Date	Effective Date	Form	Prev Shares	Latest Shares	ΔShares (Percent)	Ownership (Percent)	ΔOwnership (Percent)
2025-02-05	2025-02-05	13G/A	36,781,145	43,047,962	17.04	9.20	16.46
2024-01-26	2024-01-26	13G/A	35,910,225	36,781,145	2.43	7.90	2.60
2023-01-31	2023-01-31	13G/A	36,636,712	35,910,225	-1.98	7.70	-3.75
2022-02-01	2022-02-01	13G/A	34,348,573	36,636,712	6.66	8.00	3.90
2021-01-29	2021-01-29	13G/A	34,348,573	34,348,573	0.00	7.70	0.00
2021-01-29	2021-01-29	13G/A	32,118,657	34,348,573	6.94	7.70	5.48
2020-02-05	2020-02-05	13G/A	29,727,193	32,118,657	8.04	7.30	8.96
2019-03-18	2019-03-18	13G/A	29,727,193	29,727,193	0.00	6.70	0.00
2019-02-04	2019-02-04	13G/A	27,678,680	29,727,193	7.40	6.70	3.08
2018-02-08	2018-02-08	13G/A	27,173,344	27,678,680	1.86	6.50	3.17
2017-01-19	2017-01-19	13G/A	26,437,429	27,173,344	2.78	6.30	1.61
2016-02-10	2016-02-10	13G/A		26,437,429		6.20
2015-02-09	2015-02-09	13G/A		27,452,969		6.90
2014-01-28	2014-01-28	13G/A		25,421,493		6.40
2013-01-31	2013-01-31	13G		29,270,857		7.40
2012-02-09	2012-02-09	13G		23,516,897		5.98

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)

File Date	Effective Date	Form	Security	Class	ID	Reported Shares	ΔShares	ΔShares (%)	Reported Value (x1000)	ΔValue (%)	Alloc (%)
2026-05-13	2026-03-31	13F	AMERICAN TOWER	COM	03027X100	44,954,137	919,381	2.09	7,758,185	0.35	0.0101
2026-02-12	2025-12-31	13F	AMERICAN TOWER CORP	COM	03027X100	44,034,756	-1,368,793	-3.01	7,731,182	-11.46	0.1307
2025-11-12	2025-09-30	13F	AMERICAN TOWER CORP	COM	03027X100	45,403,549	-255,761	-0.56	8,732,011	-13.47	0.1529
2025-08-12	2025-06-30	13F	AMERICAN TOWER CORP	COM	03027X100	45,659,310	2,678,855	6.23	10,091,621	7.90	0.1921
2025-05-02	2025-03-31	13F	AMERICAN TOWER CORP	COM	03027X100	42,980,455	-66,797	-0.16	9,352,547	18.46	0.1964
2025-02-07	2024-12-31	13F	AMERICAN TOWER CORP	COM	03027X100	43,047,252	4,115,135	10.57	7,895,297	-12.80	0.1598
2024-11-13	2024-09-30	13F	AMERICAN TOWER CORP	COM	03027X100	38,932,117	817,182	2.14	9,054,053	22.21	0.1901
2024-08-13	2024-06-30	13F	AMERICAN TOWER CORP	COM	03027X100	38,114,935	1,702,747	4.68	7,408,781	2.98	0.1677
2024-05-10	2024-03-31	13F	AMERICAN TOWER CORP	COM	03027X100	36,412,188	-358,644	-0.98	7,194,684	-9.37	0.1675
2024-02-13	2023-12-31	13F	AMERICAN TOWER CORP	COM	03027X100	36,770,832	992,783	2.77	7,938,087	34.92	0.2024
2023-11-13	2023-09-30	13F	AMERICAN TOWER CORP	COM	03027X100	35,778,049	144,421	0.41	5,883,700	-14.86	0.1692
2023-08-11	2023-06-30	13F	AMERICAN TOWER CORP	COM	03027X100	35,633,628	-13,024	-0.04	6,910,786	-5.12	0.1905
2023-05-12	2023-03-31	13F	AMERICAN TOWER CORP	COM	03027X100	35,646,652	-264,641	-0.74	7,284,037	-4.26	0.2149
2023-02-13	2022-12-31	13F	AMERICAN TOWER CORP	COM	03027X100	35,911,293	94,975	0.27	7,608,166	-1.06	0.2384
2022-11-14	2022-09-30	13F	AMERICAN TOWER CORP	COM	03027X100	35,816,318	-58,783	-0.16	7,689,764	-16.14	0.2615
2022-08-12	2022-06-30	13F	AMERICAN TOWER CORP	COM	03027X100	35,875,101	835,253	2.38	9,169,318	4.16	0.2941
2022-05-12	2022-03-31	13F	AMERICAN TOWER CORP	COM	03027X100	35,039,848	-1,596,864	-4.36	8,802,710	-17.86	0.2371
2022-02-10	2021-12-31	13F	AMERICAN TOWER CORP	COM	03027X100	36,636,712	2,302,202	6.71	10,716,237	17.60	0.2729
2021-11-09	2021-09-30	13F	AMERICAN TOWER CORP	COM	03027X100	34,334,510	157,675	0.46	9,112,721	-1.30	0.2551
2021-08-11	2021-06-30	13F	AMERICAN TOWER CORP	COM	03027X100	34,176,835	-379,758	-1.10	9,232,530	11.76	0.2570
2021-05-07	2021-03-31	13F	AMERICAN TOWER CORP	COM	03027X100	34,556,593	208,020	0.61	8,261,099	7.15	0.2428
2021-02-05	2020-12-31	13F	AMERICAN TOWER CORP	COM	03027X100	34,348,573	776,600	2.31	7,709,879	-5.00	0.2459
2020-11-06	2020-09-30	13F	AMERICAN TOWER CORP	COM	03027X100	33,571,973	696,521	2.12	8,115,354	-4.52	0.2995
2020-08-14	2020-06-30	13F	AMERICAN TOWER CORP	COM	03027X100	32,875,452	1,636,978	5.24	8,499,618	24.95	0.3393
2020-05-01	2020-03-31	13F	AMERICAN TOWER CORP	COM	03027X100	31,238,474	-880,183	-2.74	6,802,176	-7.85	0.3327
2020-02-13	2019-12-31	13F	AMERICAN TOWER CORP	COM	03027X100	32,118,657	-335,088	-1.03	7,381,508	2.86	0.2830
2019-11-08	2019-09-30	13F	AMERICAN TOWER CORP	COM	03027X100	32,453,745	904,059	2.87	7,176,497	11.26	0.3014
2019-08-22	2019-06-30	13F/A-1	AMERICAN TOWER CORP	COM	03027X100	31,549,686	1,213,664	4.00	6,450,332	7.90	0.2759
2019-08-13	2019-06-30	13F	AMERICAN TOWER CORP	COM	03027X100	31,549,686	1,213,664		6,450,332
2019-05-09	2019-03-31	13F	AMERICAN TOWER CORP	COM	03027X100	30,336,022	610,821	2.05	5,978,017	27.13	0.2669
2019-02-08	2018-12-31	13F	AMERICAN TOWER CORP	COM	03027X100	29,725,201	-86,118	-0.29	4,702,230	8.56	0.2374
2018-11-09	2018-09-30	13F	AMERICAN TOWER CORP	COM	03027X100	29,811,319	448,362	1.53	4,331,586	2.32	0.1874
2018-08-09	2018-06-30	13F	AMERICAN TOWER CORP	COM	03027X100	29,362,957	2,410,425	8.94	4,233,258	8.07	0.1950
2018-05-09	2018-03-31	13F	AMERICAN TOWER CORP	COM	03027X100	26,952,532	570,522	2.16	3,917,281	4.07	0.1873
2018-02-09	2017-12-31	13F	AMERICAN TOWER CORP	COM	03027X100	26,382,010	-43,911	-0.17	3,763,922	4.21	0.1791
2017-11-14	2017-09-30	13F	AMERICAN TOWER CORP	COM	03027X100	26,425,921	416,712	1.60	3,611,896	4.95	0.1822
2017-08-10	2017-06-30	13F	AMERICAN TOWER CORP	COM	03027X100	26,009,209	103,834	0.40	3,441,539	9.31	0.1825
2017-05-12	2017-03-31	13F	AMERICAN TOWER CORP	COM	03027X100	25,905,375	24,770,459	2,182.58	3,148,538	2,525.14	0.1728
2017-02-10	2016-12-31	13F	AMERICAN TOWER CORP	COM	03027X100	1,134,916	-72,300	-5.99	119,938	-12.33	0.1697
2016-11-08	2016-09-30	13F	AMERICAN TOWER CORP	COM	03027X100	1,207,216	59,072	5.14	136,814	4.89	0.1964
2016-08-10	2016-06-30	13F	AMERICAN TOWER CORP	COM	03027X100	1,148,144	61,122	5.62	130,440	17.22	0.1963
2016-05-10	2016-03-31	13F	AMERICAN TOWER CORP	COM	03027X100	1,087,022	-188,765	-14.80	111,278	-10.03	0.1790
2016-02-11	2015-12-31	13F	AMERICAN TOWER CORP	COM	03027X100	1,275,787	20,570	1.64	123,687	12.00	0.1815
2015-11-13	2015-09-30	13F	AMERICAN TOWER CORP	COM	03027X100	1,255,217	87,417	7.49	110,434	1.37	0.1731
2015-08-07	2015-06-30	13F	AMERICAN TOWER CORP	COM	03027X100	1,167,800	-76,616	-6.16	108,944	-7.01	0.1615
2015-05-13	2015-03-31	13F	AMERICAN TOWER CORP	COM	03027X100	1,244,416	66,089	5.61	117,162	0.59	0.1619
2015-02-09	2014-12-31	13F	AMERICAN TOWER CORP	COM	03027X100	1,178,327	32,564	2.84	116,477	8.57	0.1666
2014-10-29	2014-09-30	13F	AMERICAN TOWER CORP	COM	03027X100	1,145,763	-148,740	-11.49	107,278	-7.90	0.1568
2014-08-06	2014-06-30	13F	AMERICAN TOWER CORP	COM	03027X100	1,294,503	147,749	12.88	116,479	24.07	0.1732
2014-05-02	2014-03-31	13F	AMERICAN TOWER CORP	COM	03027X100	1,146,754	-3,716	-0.32	93,884	2.24	0.1516
2014-02-12	2013-12-31	13F	AMERICAN TOWER CORP	COM	03027X100	1,150,470	7,570	0.66	91,831	8.39	0.1499
2013-11-12	2013-09-30	13F	AMERICAN TOWER CORP	COM	03027X100	1,142,900	-531,290	-31.73	84,723	-30.84	0.1597
2013-08-13	2013-06-30	13F	AMERICAN TOWER CORP	COM	03027X100	1,674,190	1,674,190		122,501		0.2428

Legend

Shares: The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value: The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price: The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class: This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred

Allocation (%): The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation: The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%): The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis: The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss: This is the market value of the position as of the effective date minus the cost basis.