Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionArvest Bank Trust Division
Latest Disclosed Ownership4,987 shares
Latest Disclosed Value $ 4,969,196
Arvest Bank Trust Division reports 0.68% decrease in ownership of COST / Costco Wholesale Corporation

On May 13, 2026 - Arvest Bank Trust Division filed a 13F-HR form disclosing ownership of 4,987 shares of Costco Wholesale Corporation (MX:COST) valued at $4,969,196 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 5,021 shares of Costco Wholesale Corporation. This represents a change in shares of -0.68% 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)
2026-05-13 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 4,987 -34 -0.68 4,969 14.78 0.2700
2026-02-09 2025-12-31 13F COSTCO WHOLESALE COM 22160K105 5,021 4,392 698.25 4,330 643.81 0.2344
2025-11-07 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 629 -25 -3.82 582 -10.05 0.0323
2025-08-08 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 654 -14 -2.10 647 2.54 0.0378
2025-05-14 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 668 221 49.44 632 54.28 0.0400
2025-02-13 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 447 14 3.23 410 6.79 0.0247
2024-11-25 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 433 -285 -39.69 384 18.58 0.0221
2021-11-12 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 718 66 10.12 323 25.19 0.0181
2021-08-19 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 652 -22 -3.26 258 8.40 0.0142
2021-04-13 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 674 120 21.66 238 13.88 0.0138
2021-02-17 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 554 554 209 0.0130
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.