Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionTFB Advisors LLC
Latest Disclosed Ownership543 shares
Latest Disclosed Value $ 541,061
TFB Advisors LLC reports 14.76% decrease in ownership of COST / Costco Wholesale Corporation

On April 20, 2026 - TFB Advisors LLC filed a 13F-HR form disclosing ownership of 543 shares of Costco Wholesale Corporation (MX:COST) valued at $541,061 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 637 shares of Costco Wholesale Corporation. This represents a change in shares of -14.76% 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)
2026-04-20 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 543 -94 -14.76 541 -1.46 0.2832
2026-02-13 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 637 -3 -0.47 549 -9.26 0.1534
2025-11-04 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 640 -458 -41.71 606 -44.29 0.1764
2025-07-30 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 1,098 -23 -2.05 1,087 2.45 0.2847
2025-05-14 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 1,121 25 2.28 1,060 5.58 0.3055
2025-01-29 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 1,096 24 2.24 1,004 5.68 0.2872
2024-10-31 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 1,072 21 2.00 950 6.38 0.2828
2024-07-30 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 1,051 173 19.70 893 40.85 0.2910
2024-05-03 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 878 550 167.68 634 193.52 0.2300
2024-01-18 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 328 -488 -59.80 217 -53.15 0.1109
2023-11-13 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 816 79 10.72 461 16.41 0.5603
2023-07-18 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 737 334 82.88 397 98.00 0.1728
2023-04-10 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 403 403 200 0.1522
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.