Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionArjuna Capital
Latest Disclosed Ownership3,583 shares
Latest Disclosed Value $ 3,570,209
Arjuna Capital reports 3.50% increase in ownership of COST / Costco Wholesale Corporation

On May 6, 2026 - Arjuna Capital filed a 13F-HR form disclosing ownership of 3,583 shares of Costco Wholesale Corporation (MX:COST) valued at $3,570,209 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 3,462 shares of Costco Wholesale Corporation. This represents a change in shares of 3.50% 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)
2026-05-06 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 3,583 121 3.50 3,570 19.60 0.9078
2026-02-05 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 3,462 -1,665 -32.48 2,985 -37.09 0.7314
2025-11-04 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 5,127 96 1.91 4,746 -4.72 1.1796
2025-08-13 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 5,031 -226 -4.30 4,980 0.18 1.3128
2025-05-09 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 5,257 -861 -14.07 4,972 -11.31 1.3762
2025-02-07 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 6,118 -103 -1.66 5,606 1.63 1.4917
2024-11-05 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 6,221 -114 -1.80 5,515 2.43 1.4284
2024-07-29 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 6,335 -82 -1.28 5,385 14.53 1.4488
2024-05-13 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 6,417 251 4.07 4,701 15.50 1.3329
2024-02-08 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 6,166 2,184 54.85 4,070 80.97 1.2739
2023-11-09 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 3,982 -14 -0.35 2,250 4.56 0.8058
2023-08-09 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 3,996 -1,976 -33.09 2,151 -27.50 0.7622
2023-05-15 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 5,972 -3,786 -38.80 2,967 -33.39 1.1641
2023-02-06 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 9,758 -92 -0.93 4,455 -4.26 2.0540
2022-11-01 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 9,850 -78 -0.79 4,652 -2.23 2.2871
2022-07-22 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 9,928 518 5.50 4,758 -12.20 2.3038
2022-05-12 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 9,410 533 6.00 5,419 7.52 2.2587
2022-02-11 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 8,877 499 5.96 5,040 33.86 1.8454
2021-11-08 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 8,378 1,107 15.22 3,765 30.87 1.5300
2021-08-11 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 7,271 197 2.78 2,877 15.36 1.2435
2021-05-11 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 7,074 2,371 50.41 2,494 40.74 1.2263
2021-02-09 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 4,703 1,932 69.72 1,772 80.08 0.9808
2020-11-05 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 2,771 -61 -2.15 984 14.55 0.6107
2020-08-13 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 2,832 41 1.47 859 8.05 0.5926
2020-05-11 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 2,791 -8 -0.29 795 -3.40 0.6633
2020-01-30 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 2,799 -1 -0.04 823 1.98 0.5958
2019-11-06 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 2,800 59 2.15 807 11.31 0.6881
2019-08-21 2019-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 2,741 25 0.92 725 10.18 0.5212
2019-08-08 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 2,741 25 725
2019-05-14 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 2,716 496 22.34 658 45.25 0.5088
2019-01-31 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 2,220 2,220 453 0.4126
2018-04-24 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 0 -1,256 -100.00 0 -100.00
2018-02-09 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 1,256 1,256 234 0.2191
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.