Costco Wholesale Corporation
AT ˙ WBAG ˙ US22160K1051
855,00 € ↑14,50 (1,73%)
2026-06-05
CENA AKCJI
SecurityAT:COST / Costco Wholesale Corporation
InstitutionSlateStone Wealth, LLC
Latest Disclosed Ownership11,608 shares
Latest Disclosed Value $ 11,567
SlateStone Wealth, LLC reports 0.16% increase in ownership of COST / Costco Wholesale Corporation

On May 14, 2026 - SlateStone Wealth, LLC filed a 13F-HR form disclosing ownership of 11,608 shares of Costco Wholesale Corporation (AT:COST) valued at $10,006,096 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 11,589 shares of Costco Wholesale Corporation. This represents a change in shares of 0.16% during the quarter. The current value of the position is $9,924,840 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 11,608 19 0.16 12 22.22 0.9536
2026-02-11 2025-12-31 13F Costco Wholesale COM 22160K105 11,589 -596 -4.89 10 -18.18 0.8363
2025-11-05 2025-09-30 13F Costco Wholesale COM 22160K105 12,185 -636 -4.96 11 -8.33 0.9763
2025-08-12 2025-06-30 13F Costco Wholesale COM 22160K105 12,821 -48 -0.37 13 0.00 1.1867
2025-05-08 2025-03-31 13F Costco Wholesale COM 22160K105 12,869 -205 -1.57 12 9.09 1.2216
2025-02-10 2024-12-31 13F Costco Wholesale COM 22160K105 13,074 -109 -0.83 12 0.00 1.1750
2024-11-07 2024-09-30 13F Costco Wholesale COM 22160K105 13,183 848 6.87 12 10.00 1.0524
2024-07-25 2024-06-30 13F Costco Wholesale COM 22160K105 12,335 -265 -2.10 10 11.11 1.1362
2024-04-26 2024-03-31 13F Costco Wholesale COM 22160K105 12,600 -815 -6.08 9 12.50 0.9269
2024-02-01 2023-12-31 13F Costco Wholesale COM 22160K105 13,415 91 0.68 9 14.29 1.1493
2023-10-12 2023-09-30 13F Costco Wholesale COM 22160K105 13,324 466 3.62 8 16.67 1.0949
2023-08-07 2023-06-30 13F Costco Wholesale COM 22160K105 12,858 -192 -1.47 7 0.00 1.2971
2023-08-08 2023-03-31 13F Costco Wholesale COM 22160K105 13,050 1,149 9.65 6 -99.89 1.3427
2023-02-01 2022-12-31 13F Costco Wholesale COM 22160K105 11,901 984 9.01 5,433 5.35 1.3107
2022-11-03 2022-09-30 13F Costco Wholesale COM 22160K105 10,917 366 3.47 5,156 1.96 1.3719
2022-08-04 2022-06-30 13F Costco Wholesale COM 22160K105 10,551 504 5.02 5,057 -12.58 1.2919
2022-05-04 2022-03-31 13F Costco Wholesale COM 22160K105 10,047 68 0.68 5,785 2.12 1.2900
2022-02-02 2021-12-31 13F Costco Wholesale COM 22160K105 9,979 -413 -3.97 5,665 21.33 1.2103
2021-10-28 2021-09-30 13F Costco Wholesale COM 22160K105 10,392 10 0.10 4,669 13.66 1.0690
2021-08-02 2021-06-30 13F Costco Wholesale COM 22160K105 10,382 -38 -0.36 4,108 11.84 0.9392
2021-04-19 2021-03-31 13F Costco Wholesale COM 22160K105 10,420 -493 -4.52 3,673 -10.68 0.9074
2021-01-25 2020-12-31 13F Costco Wholesale COM 22160K105 10,913 -6,772 -38.29 4,112 -34.50 1.0254
2020-10-27 2020-09-30 13F Costco Wholesale COM 22160K105 17,685 376 2.17 6,278 19.63 1.3551
2020-07-29 2020-06-30 13F Costco Wholesale COM 22160K105 17,309 873 5.31 5,248 11.99 1.1731
2020-04-28 2020-03-31 13F Costco Wholesale COM 22160K105 16,436 -526 -3.10 4,686 -6.00 1.3329
2020-02-06 2019-12-31 13F Costco Wholesale COM 22160K105 16,962 855 5.31 4,985 7.41 1.1399
2019-11-05 2019-09-30 13F Costco Wholesale COM 22160K105 16,107 -125 -0.77 4,641 8.21 1.3549
2019-08-05 2019-06-30 13F Costco Wholesale COM 22160K105 16,232 115 0.71 4,289 9.89 1.2078
2019-05-06 2019-03-31 13F Costco Wholesale COM 22160K105 16,117 -310 -1.89 3,903 16.65 1.1985
2019-02-13 2018-12-31 13F Costco Wholesale COM 22160K105 16,427 16,427 3,346 1.5387
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.