Costco Wholesale Corporation
IT ˙ BIT ˙ US22160K1051
836,20 € ↑12,80 (1,55%)
2026-06-04
PREZZO DELLE AZIONI
SecurityIT:1COST / Costco Wholesale Corporation
InstitutionMather Group, Llc.
Latest Disclosed Ownership9,264 shares
Latest Disclosed Value $ 9,230,926
Mather Group, Llc. reports 13.47% increase in ownership of 1COST / Costco Wholesale Corporation

On April 13, 2026 - Mather Group, Llc. filed a 13F-HR form disclosing ownership of 9,264 shares of Costco Wholesale Corporation (IT:1COST) valued at $8,327,410 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 13, 2026 disclosing 8,164 shares of Costco Wholesale Corporation. This represents a change in shares of 13.47% during the quarter. The current value of the position is $7,746,557 USD.

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 Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-04-13 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 9,264 1,100 13.47 9,231 31.13 0.0921
2026-01-13 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 8,164 354 4.53 7,040 -2.61 0.0725
2025-10-21 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 7,810 293 3.90 7,229 -2.86 0.0730
2025-07-15 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 7,517 -173 -2.25 7,442 2.31 0.0795
2025-04-25 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 7,690 424 5.84 7,273 9.25 0.0841
2025-01-27 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 7,266 -421 -5.48 6,658 -2.32 0.0864
2024-10-07 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 7,687 -5,724 -42.68 6,815 -30.64 0.0875
2024-07-09 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 13,411 5,447 68.40 9,826 86.89 0.1210
2024-04-09 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 7,964 -1,867 -18.99 5,257 -18.99 0.0830
2024-02-05 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 9,831 231 2.41 6,489 19.66 0.1018
2023-11-13 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 9,600 3,444 55.95 5,424 63.64 0.0963
2023-08-08 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 6,156 645 11.70 3,314 21.04 0.0528
2023-05-09 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 5,511 1,802 48.58 2,738 61.72 0.0486
2023-03-10 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 3,709 621 20.11 1,693 16.12 0.0326
2022-11-15 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 3,088 169 5.79 1,458 4.22 0.0314
2022-08-16 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 2,919 603 26.04 1,399 4.87 0.0319
2022-05-13 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 2,316 306 15.22 1,334 16.91 0.0263
2022-02-15 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 2,010 38 1.93 1,141 28.78 0.0223
2021-11-04 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 1,972 535 37.23 886 55.99 0.0213
2021-08-13 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 1,437 -225 -13.54 568 -3.07 0.0143
2021-05-14 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 1,662 -168 -9.18 586 -14.95 0.0166
2021-02-12 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 1,830 195 11.93 689 18.79 0.0225
2020-11-13 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 1,635 197 13.70 580 33.03 0.0228
2020-08-14 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 1,438 186 14.86 436 22.13 0.0200
2020-05-14 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 1,252 1,252 357 0.0250
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.