Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionWealth Architects, LLC
Latest Disclosed Ownership1,283 shares
Latest Disclosed Value $ 1,278,787
Wealth Architects, LLC reports 0.23% increase in ownership of COST / Costco Wholesale Corporation

On May 15, 2026 - Wealth Architects, LLC filed a 13F-HR form disclosing ownership of 1,283 shares of Costco Wholesale Corporation (MX:COST) valued at $1,278,787 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,280 shares of Costco Wholesale Corporation. This represents a change in shares of 0.23% 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 Equities 22160K105 1,283 3 0.23 1,279 15.76 0.1140
2026-02-17 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 1,280 -96 -6.98 1,104 -13.34 0.0995
2025-11-13 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 1,376 -12 -0.86 1,274 -7.28 0.1203
2025-07-25 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 1,388 -100 -6.72 1,374 -2.35 0.1396
2025-05-14 2025-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 1,488 197 15.26 1,408 18.93 0.1553
2025-05-12 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 16,479 15,188 9,498 1.0483
2025-02-10 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 1,291 -50 -3.73 1,183 -0.42 0.1335
2024-10-31 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 1,341 126 10.37 1,189 15.12 0.1345
2024-08-08 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 1,215 -114 -8.58 1,033 6.06 0.1262
2024-05-13 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 1,329 -73 -5.21 974 5.19 0.1283
2024-02-14 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 1,402 105 8.10 925 26.37 0.1298
2023-11-09 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 1,297 306 30.88 733 37.34 0.1246
2023-08-02 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 991 200 25.28 534 35.62 0.0880
2023-04-21 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 791 3 0.38 393 9.47 0.0696
2023-02-10 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 788 -47 -5.63 360 -8.88 0.0680
2022-10-24 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 835 5 0.60 394 -1.01 0.0825
2022-07-29 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 830 -20 -2.35 398 -18.61 0.0778
2022-05-17 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 850 14 1.67 489 2.95 0.0831
2022-01-19 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 836 -43 -4.89 475 20.25 0.0833
2021-11-09 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 879 38 4.52 395 18.62 0.0767
2021-08-09 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 841 -40 -4.54 333 7.07 0.0652
2021-04-29 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 881 39 4.63 311 -1.89 0.0673
2021-01-28 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 842 9 1.08 317 7.09 0.0738
2020-11-09 2020-09-30 13F COSTCO WHOLESALE COM 22160K105 833 0 0.00 296 17.00 0.0803
2020-08-14 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 833 -44 -5.02 253 1.20 0.0710
2020-04-23 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 877 78 9.76 250 6.38 0.0867
2020-01-28 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 799 44 5.83 235 7.80 0.0656
2019-10-23 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 755 -195 -20.53 218 -13.15 0.0664
2019-07-12 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 950 30 3.26 251 12.56 0.0756
2019-05-01 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 920 920 223 0.0695
2019-01-17 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -909 -100.00 0 -100.00
2018-10-04 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 909 909 214 0.0660
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.