Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionQuantinno Capital Management LP
Latest Disclosed Ownership298,945 shares
Latest Disclosed Value $ 297,878,627
Quantinno Capital Management LP reports 27.92% increase in ownership of COST / Costco Wholesale Corporation

On May 15, 2026 - Quantinno Capital Management LP filed a 13F-HR form disclosing ownership of 298,945 shares of Costco Wholesale Corporation (MX:COST) valued at $297,878,627 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 233,694 shares of Costco Wholesale Corporation. This represents a change in shares of 27.92% 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)
2026-05-15 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 298,945 65,251 27.92 297,879 47.81 0.4971
2026-02-17 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 233,694 36,893 18.75 201,525 10.63 0.4047
2025-11-14 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 196,801 41,235 26.51 182,165 18.29 0.4970
2025-08-14 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 155,566 47,909 44.50 154,002 51.25 0.6651
2025-05-12 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 107,657 32,108 42.50 101,820 47.09 0.6631
2025-02-14 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 75,549 21,752 40.43 69,224 45.15 0.6807
2024-11-14 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 53,797 9,237 20.73 47,693 25.92 0.6200
2024-08-14 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 44,560 6,144 15.99 37,876 34.57 0.6812
2024-05-14 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 38,416 11,454 42.48 28,145 58.14 0.6118
2024-02-14 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 26,962 3,861 16.71 17,797 36.37 0.6229
2023-11-14 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 23,101 3,214 16.16 13,051 21.89 0.5941
2023-08-04 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 19,887 11,025 124.41 10,707 143.12 0.6115
2023-05-03 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 8,862 914 11.50 4,404 21.36 0.2912
2023-02-13 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 7,948 1,600 25.20 3,629 21.05 0.2707
2022-11-08 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 6,348 1,622 34.32 2,998 32.36 0.3860
2022-08-15 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 4,726 455 10.65 2,265 -7.93 0.3268
2022-05-12 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 4,271 1,656 63.33 2,460 65.66 0.3752
2022-02-14 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 2,615 2,615 1,485 0.2689
2021-02-09 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -798 -100.00 0 -100.00
2020-11-16 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 798 798 283 0.1893
2020-08-14 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 0 -2,176 -100.00 0 -100.00
2020-05-15 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 2,176 2,176 620 0.3872
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.