Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionSlow Capital, Inc.
Latest Disclosed Ownership18,666 shares
Latest Disclosed Value $ 18,599,109
Slow Capital, Inc. reports 4.71% increase in ownership of COST / Costco Wholesale Corporation

On April 24, 2026 - Slow Capital, Inc. filed a 13F-HR form disclosing ownership of 18,666 shares of Costco Wholesale Corporation (MX:COST) valued at $18,599,109 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 17,826 shares of Costco Wholesale Corporation. This represents a change in shares of 4.71% 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)
2026-04-24 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 18,666 840 4.71 18,599 21.00 2.4155
2026-01-26 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 17,826 555 3.21 15,372 -3.85 1.8356
2025-10-29 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 17,271 -26 -0.15 15,987 -6.64 1.8784
2025-07-23 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 17,297 -115 -0.66 17,123 3.98 2.0971
2025-05-02 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 17,412 3,723 27.20 16,468 31.29 2.2048
2025-01-22 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 13,689 -603 -4.22 12,543 -1.01 1.7754
2024-10-18 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 14,292 -277 -1.90 12,670 2.32 1.9410
2024-07-24 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 14,569 -2,167 -12.95 12,383 1.00 2.0046
2024-04-17 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 16,736 -102 -0.61 12,261 10.32 1.9647
2024-01-31 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 16,838 -81 -0.48 11,114 16.28 1.9338
2023-10-19 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 16,919 404 2.45 9,558 7.50 1.7549
2023-08-09 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 16,515 -131 -0.79 8,892 7.51 1.5429
2023-04-26 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 16,646 1,982 13.52 8,271 23.56 1.5471
2023-02-13 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 14,664 -123 -0.83 6,694 -4.17 1.4896
2022-10-27 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 14,787 -256 -1.70 6,984 -3.13 1.5093
2022-07-28 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 15,043 172 1.16 7,210 -15.80 1.7506
2022-05-02 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 14,871 -3,344 -18.36 8,563 -17.19 1.5995
2022-02-08 2021-12-31 13F Costco Wholesale COM 22160K105 18,215 -1,195 -6.16 10,341 18.56 1.7672
2021-10-21 2021-09-30 13F Costco Wholesale COM 22160K105 19,410 -145 -0.74 8,722 12.73 1.5988
2021-07-29 2021-06-30 13F Costco Wholesale COM 22160K105 19,555 1,266 6.92 7,737 18.39 1.4630
2021-05-20 2021-03-31 13F/A-1 Costco Wholesale COM 22160K105 18,289 580 3.28 6,535 -2.07 1.4181
2021-05-05 2021-03-31 13F Costco Wholesale COM 22160K105 17,767 58 6,263 1.5249
2021-02-11 2020-12-31 13F Costco Wholesale COM 22160K105 17,709 -174 -0.97 6,673 5.12 1.5953
2020-11-04 2020-09-30 13F Costco Wholesale COM 22160K105 17,883 297 1.69 6,348 19.05 1.7292
2020-08-10 2020-06-30 13F Costco Wholesale COM 22160K105 17,586 225 1.30 5,332 7.72 1.5653
2020-05-12 2020-03-31 13F Costco Wholesale COM 22160K105 17,361 -985 -5.37 4,950 -8.20 1.8688
2020-02-14 2019-12-31 13F Costco Wholesale COM 22160K105 18,346 -565 -2.99 5,392 -1.05 1.6672
2019-11-06 2019-09-30 13F Costco Wholesale COM 22160K105 18,911 3,069 19.37 5,449 30.17 1.9269
2019-08-01 2019-06-30 13F Costco Wholesale COM 22160K105 15,842 -469 -2.88 4,186 5.97 1.7268
2019-05-16 2019-03-31 13F Costco Wholesale COM 22160K105 16,311 -149 -0.91 3,950 17.80 1.5708
2019-01-30 2018-12-31 13F Costco Wholesale COM 22160K105 16,460 119 0.73 3,353 -12.64 1.6139
2018-11-14 2018-09-30 13F Costco Wholesale COM 22160K105 16,341 459 2.89 3,838 15.64 1.7088
2018-08-14 2018-06-30 13F Costco Wholesale COM 22160K105 15,882 -706 -4.26 3,319 6.17 1.6828
2018-05-11 2018-03-31 13F Costco Wholesale COM 22160K105 16,588 417 2.58 3,126 3.85 1.4040
2018-02-15 2017-12-31 13F Costco Wholesale COM 22160K105 16,171 16,171 3,010 1.5603
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.