Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionStrong Tower Advisory Services
Latest Disclosed Ownership3,959 shares
Latest Disclosed Value $ 3,944,788
Strong Tower Advisory Services reports 2.46% increase in ownership of COST / Costco Wholesale Corporation

On April 16, 2026 - Strong Tower Advisory Services filed a 13F-HR form disclosing ownership of 3,959 shares of Costco Wholesale Corporation (MX:COST) valued at $3,944,788 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 3,864 shares of Costco Wholesale Corporation. This represents a change in shares of 2.46% 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)
2026-04-16 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 3,959 95 2.46 3,945 18.40 0.7423
2026-01-23 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 3,864 735 23.49 3,332 15.02 0.5966
2025-10-15 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 3,129 73 2.39 2,896 -4.26 0.5485
2025-07-24 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 3,056 116 3.95 3,025 13.34 0.5964
2025-04-09 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 2,940 68 2.37 2,670 1.44 0.6567
2025-01-16 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 2,872 138 5.05 2,631 8.58 0.6866
2024-10-09 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 2,734 299 12.28 2,423 17.11 0.6755
2024-07-15 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 2,435 568 30.42 2,069 53.71 0.6791
2024-04-12 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 1,867 137 7.92 1,346 17.86 0.5408
2024-01-18 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 1,730 51 3.04 1,142 20.46 0.5058
2023-10-11 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 1,679 16 0.96 949 5.92 0.4746
2023-07-14 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 1,663 82 5.19 896 14.01 0.4242
2023-04-14 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 1,581 51 3.33 786 12.46 0.4141
2023-01-20 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 1,530 9 0.59 699 -2.79 0.4193
2022-10-14 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 1,521 38 2.56 718 0.98 0.4267
2022-08-10 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 1,483 54 3.78 711 -13.61 0.3857
2022-04-14 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 1,429 1,429 823 0.4210
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.