Costco Wholesale Corporation
AT ˙ WBAG ˙ US22160K1051
855,00 € ↑14,50 (1,73%)
2026-06-05
CENA AKCJI
SecurityAT:COST / Costco Wholesale Corporation
InstitutionOssiam
Latest Disclosed Ownership9,516 shares
Latest Disclosed Value $ 9,482,028
Ossiam reports 90.86% decrease in ownership of COST / Costco Wholesale Corporation

On May 14, 2026 - Ossiam filed a 13F-HR form disclosing ownership of 9,516 shares of Costco Wholesale Corporation (AT:COST) valued at $8,202,792 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 104,156 shares of Costco Wholesale Corporation. This represents a change in shares of -90.86% during the quarter. The current value of the position is $8,136,180 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)
2026-05-14 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 9,516 -94,640 -90.86 9,482 -89.44 0.1668
2026-02-13 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 104,156 77,355 288.63 89,818 262.06 1.7937
2025-11-14 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 26,801 -42,338 -61.24 24,808 -63.76 0.3193
2025-08-13 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 69,139 48,151 229.42 68,443 244.80 0.7697
2025-05-14 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 20,988 11,457 120.21 19,850 127.32 0.2772
2025-02-13 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 9,531 -47,435 -83.27 8,733 -82.71 0.1508
2024-11-13 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 56,966 16,559 40.98 50,501 47.04 0.9762
2024-08-13 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 40,407 -137,919 -77.34 34,346 -73.71 0.6509
2024-05-13 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 178,326 162,726 1,043.12 130,647 1,168.78 2.2883
2024-02-13 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 15,600 -75,523 -82.88 10,297 -80.00 0.1658
2023-11-14 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 91,123 84,905 1,365.47 51,481 1,438.09 0.9097
2023-08-11 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 6,218 -71,538 -92.00 3,348 -91.34 0.0601
2023-05-12 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 77,756 66,550 593.88 38,635 655.31 0.8027
2023-02-13 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 11,206 -28,149 -71.53 5,116 -72.48 0.1326
2022-11-14 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 39,355 29,382 294.62 18,586 288.83 0.5383
2022-08-12 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 9,973 4,358 77.61 4,780 47.85 0.1438
2022-05-13 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 5,615 408 7.84 3,233 9.37 0.0846
2022-02-14 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 5,207 -545 -9.47 2,956 14.35 0.0775
2021-11-12 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 5,752 -723 -11.17 2,585 -7.08 0.0732
2021-08-13 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 6,475 -41,687 -86.56 2,782 -83.61 0.0755
2021-05-17 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 48,162 -22,186 -31.54 16,976 -35.95 0.5285
2021-02-12 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 70,348 54,348 339.68 26,506 366.65 0.9250
2020-11-12 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 16,000 12,454 351.21 5,680 428.37 0.2378
2020-08-13 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 3,546 -36,664 -91.18 1,075 -90.62 0.0687
2020-05-14 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 40,210 31,447 358.86 11,465 345.07 0.7804
2020-02-14 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 8,763 8,763 2,576 0.1964
2019-11-13 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 0 -4,076 -100.00 0 -100.00
2019-08-13 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 4,076 -2,101 -34.01 1,077 -28.01 0.0838
2019-05-15 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 6,177 1,931 45.48 1,496 72.95 0.1235
2019-02-14 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 4,246 4,246 865 0.1300
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.