Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionQuadrant Capital Group Llc
Latest Disclosed Ownership12,326 shares
Latest Disclosed Value $ 12,282,155
Quadrant Capital Group Llc reports 6.76% increase in ownership of COST / Costco Wholesale Corporation

On May 13, 2026 - Quadrant Capital Group Llc filed a 13F-HR/A form disclosing ownership of 12,326 shares of Costco Wholesale Corporation (MX:COST) valued at $12,282,155 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 11,545 shares of Costco Wholesale Corporation. This represents a change in shares of 6.76% 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)
2026-05-13 2026-03-31 13F/A-1 COSTCO WHOLESALE COM 22160K105 12,326 781 6.76 12,282 23.38 0.3672
2026-05-11 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 12,326 781 49 0.0369
2026-02-12 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 11,545 740 6.85 9,956 -0.46 0.3008
2025-11-13 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 10,805 -477 -4.23 10,002 -10.45 0.3251
2025-08-13 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 11,282 1,777 18.70 11,169 24.24 0.4020
2025-05-13 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 9,505 4,735 99.27 8,990 105.70 0.3339
2025-02-13 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 4,770 160 3.47 4,371 6.95 0.3009
2024-11-12 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 4,610 28 0.61 4,087 4.93 0.2839
2024-08-12 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 4,582 781 20.55 3,895 39.87 0.2892
2024-05-15 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 3,801 90 2.43 2,785 13.59 0.2199
2024-02-08 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 3,711 367 10.97 2,452 29.75 0.2106
2023-11-14 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 3,344 138 4.30 1,889 9.44 0.1892
2023-08-10 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 3,206 -116 -3.49 1,726 4.61 0.1713
2023-05-11 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 3,322 232 7.51 1,651 17.02 0.1719
2023-02-13 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 3,090 -21 -0.68 1,411 -4.02 0.1599
2022-11-10 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 3,111 350 12.68 1,469 11.04 0.1943
2022-08-09 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 2,761 67 2.49 1,323 -14.70 0.1777
2022-05-06 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 2,694 278 11.51 1,551 13.05 0.1878
2022-02-01 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 2,416 158 7.00 1,372 35.17 0.1637
2021-11-12 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 2,258 69 3.15 1,015 17.21 0.1416
2021-08-09 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 2,189 104 4.99 866 17.82 0.1256
2021-05-12 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 2,085 394 23.30 735 15.38 0.1193
2021-02-16 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 1,691 -40 -2.31 637 3.58 0.1183
2020-11-13 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 1,731 180 11.61 615 30.85 0.1340
2020-08-13 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 1,551 -2,409 -60.83 470 -58.30 0.1040
2020-05-15 2020-03-31 13F Costco Wholesale Com 22160K105 3,960 1,101 38.51 1,127 38.28 0.1887
2020-03-19 2019-12-31 13F/A-1 Costco Wholesale Com 22160K105 2,859 488 20.58 815 22.19 0.0983
2020-02-03 2019-12-31 13F Costco Wholesale Com 22160K105 2,859 488 815 2,753.9913
2019-10-24 2019-09-30 13F Costco Wholesale COM 22160K105 2,371 61 2.64 667 12.10 0.1026
2019-07-24 2019-06-30 13F Costco Wholesale COM 22160K105 2,310 570 32.76 595 47.28 0.0942
2019-04-29 2019-03-31 13F Costco Wholesale COM 22160K105 1,740 1,052 152.91 404 218.11 0.0710
2019-01-17 2018-12-31 13F COSTCO WHOLESALE COM 22160K105 688 89 14.86 127 -0.78 0.0338
2018-10-29 2018-09-30 13F COSTCO WHOLESALE COM 22160K105 599 46 8.32 128 25.49 0.0366
2018-08-08 2018-06-30 13F COSTCO WHOLESALE COM 22160K105 553 -11 -1.95 102 12.09 0.0358
2018-05-10 2018-03-31 13F COSTCO WHOLESALE COM 22160K105 564 50 9.73 91 5.81 0.0330
2018-01-31 2017-12-31 13F Costco Wholesale COM 22160K105 514 44 9.36 86 26.47 0.0343
2017-10-13 2017-09-30 13F Costco Wholesale COM 22160K105 470 64 15.76 68 112.50 0.0281
2017-08-14 2017-06-30 13F Costco Wholesale COM 22160K105 406 3 0.74 32 -46.67 0.0141
2017-04-10 2017-03-31 13F Costco Wholesale COM 22160K105 403 -124 -23.53 60 -23.08 0.0264
2017-01-11 2016-12-31 13F Costco Wholesale COM 22160K105 527 -123 -18.92 78 -14.29 0.0391
2016-10-25 2016-09-30 13F Costco Wholesale COM 22160K105 650 105 19.27 91 13.75 0.0594
2016-07-28 2016-06-30 13F Costco Wholesale COM 22160K105 545 42 8.35 80 8.11 0.0550
2016-04-27 2016-03-31 13F Costco Wholesale COM 22160K105 503 73 16.98 74 13.85 0.0480
2016-01-28 2015-12-31 13F Costco Wholesale COM 22160K105 430 98 29.52 65 44.44 0.0450
2015-10-28 2015-09-30 13F Costco Wholesale COM 22160K105 332 2 0.61 45 9.76 0.0310
2015-08-12 2015-06-30 13F Costco Wholesale COM 22160K105 330 330 41 0.0261
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.