Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionUnio Capital LLC
Latest Disclosed Ownership51,114 shares
Latest Disclosed Value $ 50,931,712
Unio Capital LLC reports 10.28% decrease in ownership of COST / Costco Wholesale Corporation

On May 15, 2026 - Unio Capital LLC filed a 13F-HR form disclosing ownership of 51,114 shares of Costco Wholesale Corporation (MX:COST) valued at $50,931,712 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 56,973 shares of Costco Wholesale Corporation. This represents a change in shares of -10.28% 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 51,114 -5,859 -10.28 50,932 3.67 10.9193
2026-02-17 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 56,973 16,974 42.44 49,130 32.70 9.2430
2025-11-14 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 39,999 9,135 29.60 37,024 21.18 8.8208
2025-08-14 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 30,864 14,514 88.77 30,554 97.59 8.9970
2025-05-15 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 16,350 -245 -1.48 15,464 1.70 5.9317
2025-02-14 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 16,595 2,576 18.38 15,206 22.34 5.4387
2024-11-14 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 14,019 -315 -2.20 12,428 2.01 5.0254
2024-08-14 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 14,334 -1,498 -9.46 12,184 5.04 5.1181
2024-05-15 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 15,832 101 0.64 11,599 11.70 5.1046
2024-02-14 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 15,731 -50 -0.32 10,384 16.47 5.3128
2023-11-14 2023-09-30 13F COSTCO WHOLESALE COM 22160K105 15,781 -124 -0.78 8,916 4.12 4.8275
2023-08-14 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 15,905 -279 -1.72 8,563 6.48 4.3680
2023-05-15 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 16,184 14 0.09 8,041 8.94 4.3059
2023-02-14 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 16,170 69 0.43 7,382 -2.93 4.1012
2022-11-14 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 16,101 -52 -0.32 7,604 -1.78 4.5934
2022-08-15 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 16,153 -12,343 -43.31 7,742 -52.82 4.4526
2022-08-01 2022-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 28,496 -1,552 -5.17 16,409 -98.32 7.0743
2022-05-16 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 28,496 -1,552 988,623 5.2283
2022-02-14 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 30,048 175 0.59 975,512 7,166.92 4.7678
2021-11-15 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 29,873 -962 -3.12 13,424 10.02 5.9767
2021-08-16 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 30,835 -1,647 -5.07 12,201 6.57 5.4414
2021-05-17 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 32,482 7,259 28.78 11,449 20.47 5.4206
2021-02-16 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 25,223 1,150 4.78 9,504 5.60 4.6771
2020-11-16 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 24,073 457 1.94 9,000 25.70 4.8686
2020-08-14 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 23,616 3,509 17.45 7,160 24.89 4.3244
2020-05-15 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 20,107 1,834 10.04 5,733 6.74 4.0427
2020-02-14 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 18,273 390 2.18 5,371 4.25 3.1467
2019-11-14 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 17,883 3,738 26.43 5,152 36.04 3.3013
2019-08-14 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 14,145 12,325 677.20 3,787 758.73 2.3585
2019-05-15 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 1,820 0 0.00 441 18.87 0.3088
2019-02-14 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 1,820 500 37.88 371 19.68 0.2927
2018-11-14 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 1,320 -500 -27.47 310 -18.42 0.2030
2018-08-13 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 1,820 0 0.00 380 10.79 0.2860
2018-05-15 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 1,820 1,820 343 0.2854
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.