Costco Wholesale Corporation
AT ˙ WBAG ˙ US22160K1051
840,50 € ↑15,20 (1,84%)
2026-06-04
DEL PRIS
SecurityAT:COST / Costco Wholesale Corporation
InstitutionGAM Holding AG
Latest Disclosed Ownership11,603 shares
Latest Disclosed Value $ 10,005,731
GAM Holding AG reports 25.19% increase in ownership of COST / Costco Wholesale Corporation

On February 17, 2026 - GAM Holding AG filed a 13F-HR form disclosing ownership of 11,603 shares of Costco Wholesale Corporation (AT:COST) valued at $10,005,731 USD as of December 31, 2025. The entity filed a previous 13F-HR on October 21, 2025 disclosing 9,268 shares of Costco Wholesale Corporation. This represents a change in shares of 25.19% during the quarter. The current value of the position is $9,920,565 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)
2026-02-17 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 11,603 2,335 25.19 10,006 16.64 0.4852
2025-10-21 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 9,268 -3,158 -25.41 8,579 -30.26 0.3877
2025-08-04 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 12,426 -4,318 -25.79 12,301 -22.33 0.8648
2025-04-22 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 16,744 1,086 6.94 15,836 10.39 1.2282
2025-01-31 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 15,658 2,216 16.49 14,347 20.39 1.0698
2024-10-22 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 13,442 -1,466 -9.83 11,916 -5.96 0.9501
2024-07-26 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 14,908 1,249 9.14 12,671 26.63 0.9722
2024-05-13 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 13,659 7,696 129.06 10,007 154.28 0.7239
2024-01-23 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 5,963 5,963 3,936 0.2927
2021-05-10 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 0 -16,245 -100.00 0 -100.00
2021-02-10 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 16,245 -15,581 -48.96 6,120 -45.84 0.3629
2020-11-06 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 31,826 15,403 93.79 11,299 126.93 0.6801
2020-08-10 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 16,423 -5,694 -25.74 4,979 -21.04 0.3095
2020-05-12 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 22,117 -3,366 -13.21 6,306 -15.81 0.4286
2020-02-06 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 25,483 -2,472 -8.84 7,490 -7.00 0.3538
2019-11-08 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 27,955 -2,757 -8.98 8,054 -0.76 0.3545
2019-08-12 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 30,712 30,712 8,116 0.3170
2019-05-10 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 0 -7,528 -100.00 0 -100.00
2019-02-08 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 7,528 96 1.29 1,534 -12.14 0.0776
2018-11-13 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 7,432 924 14.20 1,746 28.38 0.0635
2018-08-09 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 6,508 3,640 126.92 1,360 151.85 0.0473
2018-05-15 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 2,868 -423 -12.85 540 -11.91 0.0191
2018-02-14 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 3,291 3,291 613 0.0188
2017-11-14 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 0 -126,762 -100.00 0 -100.00
2017-08-07 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 126,762 10,348 8.89 20,273 3.85 0.2990
2017-05-12 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 116,414 23,924 25.87 19,521 31.82 0.3084
2017-02-10 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 92,490 32,905 55.22 14,809 63.00 0.2596
2016-11-07 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 59,585 -25,566 -30.02 9,085 -32.06 0.1597
2016-08-11 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 85,151 27,668 48.13 13,373 47.59 0.2074
2016-05-13 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 57,483 980 1.73 9,061 -0.70 0.1508
2016-02-08 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 56,503 9,771 20.91 9,125 35.07 0.1421
2015-11-12 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 46,732 503 1.09 6,756 8.20 0.1161
2015-07-27 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 46,229 2,610 5.98 6,244 -5.51 0.0904
2015-05-12 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 43,619 341 0.79 6,608 7.71 0.0989
2015-02-06 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 43,278 -301 -0.69 6,135 12.34 0.0916
2014-11-12 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 43,579 -959 -2.15 5,461 6.47 0.0793
2014-08-11 2014-06-30 13F COSTCO WHSL CORP COM 22160K105 44,538 5,977 15.50 5,129 19.11 0.0778
2014-05-15 2014-03-31 13F COSTCO WHSL CORP COM 22160K105 38,561 329 0.86 4,306 -5.36 0.0691
2014-02-12 2013-12-31 13F COSTCO WHSL CORP COM 22160K105 38,232 -204 -0.53 4,550 2.82 0.0793
2013-11-12 2013-09-30 13F COSTCO WHSL CORP COM 22160K105 38,436 6,917 21.95 4,425 26.97 0.0828
2013-08-13 2013-06-30 13F COSTCO WHOLESALE COM 22160K105 31,519 31,519 3,485 0.0762
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.