Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionWinton Capital Group Ltd
Latest Disclosed Ownership548 shares
Latest Disclosed Value $ 546,044
Winton Capital Group Ltd reports 96.69% decrease in ownership of COST / Costco Wholesale Corporation

On May 12, 2026 - Winton Capital Group Ltd filed a 13F-HR form disclosing ownership of 548 shares of Costco Wholesale Corporation (MX:COST) valued at $546,044 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 16,571 shares of Costco Wholesale Corporation. This represents a change in shares of -96.69% during the quarter.

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)
2026-05-12 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 548 -16,023 -96.69 546 -96.18 0.0192
2026-02-11 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 16,571 7,641 85.57 14,290 72.89 0.4933
2025-11-13 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 8,930 4,241 90.45 8,266 78.09 0.3094
2025-08-14 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 4,689 2,759 142.95 4,642 154.30 0.2372
2025-05-15 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 1,930 -2,791 -59.12 1,825 -57.80 0.1112
2025-02-12 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 4,721 4,485 1,900.42 4,326 1,969.38 0.2873
2024-11-12 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 236 -2,879 -92.42 209 -92.10 0.0147
2024-08-09 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 3,115 -7,760 -71.36 2,648 -66.78 0.1788
2024-05-14 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 10,875 10,875 7,967 0.5626
2024-02-12 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -13,778 -100.00 0 -100.00
2023-11-13 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 13,778 13,096 1,920.23 7,784 2,020.98 0.6414
2023-08-14 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 682 -959 -58.44 367 -54.97 0.0307
2023-05-12 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 1,641 -2,490 -60.28 815 -56.76 0.0497
2023-02-14 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 4,131 1,791 76.54 1,886 70.59 0.1242
2022-11-10 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 2,340 2,340 1,105 0.0721
2022-02-10 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -2,980 -100.00 0 -100.00
2021-10-28 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 2,980 -1,007 -25.26 1,339 -15.15 0.0750
2021-08-10 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 3,987 -2,176 -35.31 1,578 -27.35 0.0847
2021-07-21 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 6,163 1,818 41.84 2,172 32.68 0.1239
2021-02-12 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 4,345 3,529 432.48 1,637 464.48 0.1182
2020-10-30 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 816 -23,722 -96.67 290 -96.10 0.0094
2020-08-05 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 24,538 -9,812 -28.56 7,440 -24.04 0.1920
2020-05-11 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 34,350 -12,792 -27.14 9,794 -29.32 0.2584
2020-02-13 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 47,142 42,288 871.20 13,856 891.13 0.1945
2019-11-08 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 4,854 -474 -8.90 1,398 -0.71 0.0165
2019-07-08 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 5,328 1,388 35.23 1,408 47.59 0.0274
2019-05-13 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 3,940 -863 -17.97 954 -2.45 0.0192
2019-02-05 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 4,803 -1,963 -29.01 978 -38.45 0.0211
2018-11-02 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 6,766 5,253 347.19 1,589 402.85 0.0333
2018-08-20 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 1,513 -1,471 -49.30 316 -43.77 0.0081
2018-05-21 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 2,984 1,155 63.15 562 65.29 0.0159
2018-02-13 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 1,829 -3,447 -65.33 340 -60.78 0.0098
2017-11-13 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 5,276 2,311 77.94 867 82.91 0.0276
2017-08-17 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 2,965 -26,662 -89.99 474 -89.51 0.0139
2017-05-12 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 29,627 28,314 2,156.44 4,518 2,051.43 0.0776
2017-02-13 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 1,313 -28,314 -95.57 210 -95.35 0.0069
2016-11-08 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 29,627 -82,740 -73.63 4,518 -74.40 0.0776
2016-08-12 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 112,367 87,315 348.54 17,646 346.96 0.2915
2016-05-06 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 25,052 -35,412 -58.57 3,948 -59.57 0.0428
2016-02-08 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 60,464 -438,798 -87.89 9,765 -86.47 0.0868
2015-11-10 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 499,262 236,382 89.92 72,178 103.29 0.5709
2015-08-06 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 262,880 262,880 35,505 0.3261
2015-02-13 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -133,526 -100.00 0 -100.00
2014-10-28 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 133,526 -223,523 -62.60 16,733 -59.30 0.1197
2014-08-05 2014-06-30 13F COSTCO WHSL CORP COM 22160K105 357,049 357,049 41,118 0.2803
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.