Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionStrongBox Wealth, LLC
Latest Disclosed Ownership8,052 shares
Latest Disclosed Value $ 8,023,352
StrongBox Wealth, LLC reports 1.34% decrease in ownership of COST / Costco Wholesale Corporation

On May 8, 2026 - StrongBox Wealth, LLC filed a 13F-HR form disclosing ownership of 8,052 shares of Costco Wholesale Corporation (MX:COST) valued at $8,023,352 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 21, 2026 disclosing 8,161 shares of Costco Wholesale Corporation. This represents a change in shares of -1.34% 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)
2026-05-08 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 8,052 -109 -1.34 8,023 14.01 2.5675
2026-01-21 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 8,161 1,157 16.52 7,038 8.55 2.3129
2025-10-07 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 7,004 579 9.01 6,484 1.92 2.1940
2025-07-09 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 6,425 132 2.10 6,361 6.89 2.4140
2025-05-13 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 6,293 240 3.96 5,951 7.32 2.4810
2025-01-14 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 6,053 86 1.44 5,546 4.82 2.3478
2024-11-12 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 5,967 -145 -2.37 5,290 1.83 2.2667
2024-08-12 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 6,112 106 1.76 5,195 18.10 2.4533
2024-05-14 2024-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 6,006 -87 -1.43 4,400 9.37 2.3194
2024-04-26 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 6,093 0 4,022 2.3471
2024-01-08 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 6,093 118 1.97 4,022 19.17 2.3471
2023-10-10 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 5,975 257 4.49 3,376 9.65 2.1489
2023-07-24 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 5,718 105 1.87 3,078 10.36 1.9421
2023-04-21 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 5,613 63 1.14 2,789 10.11 1.8718
2023-01-19 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 5,550 259 4.90 2,534 1.36 1.7922
2022-10-14 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 5,291 -1,514 -22.25 2,499 -23.37 1.8114
2022-07-15 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 6,805 936 15.95 3,261 -3.52 2.1081
2022-04-14 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 5,869 -1,761 -23.08 3,380 -21.98 1.9272
2022-01-14 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 7,630 129 1.72 4,332 28.51 2.1640
2021-11-12 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 7,501 -292 -3.75 3,371 9.31 1.8913
2021-08-10 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 7,793 -17 -0.22 3,084 12.02 1.7676
2021-05-28 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 7,810 1,294 19.86 2,753 12.14 1.7061
2021-02-02 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 6,516 40 0.62 2,455 6.79 1.5907
2020-10-20 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 6,476 280 4.52 2,299 22.35 1.6837
2020-07-30 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 6,196 939 17.86 1,879 25.35 1.7128
2020-05-15 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 5,257 5,257 1,499 1.7005
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.