Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionOak Asset Management, LLC
Latest Disclosed Ownership5,714 shares
Latest Disclosed Value $ 5,693,601
Oak Asset Management, LLC reports 0.23% increase in ownership of COST / Costco Wholesale Corporation

On April 15, 2026 - Oak Asset Management, LLC filed a 13F-HR form disclosing ownership of 5,714 shares of Costco Wholesale Corporation (MX:COST) valued at $5,693,601 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 14, 2026 disclosing 5,701 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)
2026-04-15 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 5,714 13 0.23 5,694 15.81 1.9604
2026-01-14 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 5,701 1,615 39.53 4,916 29.98 1.6767
2025-10-20 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 4,086 78 1.95 3,782 -4.66 1.2937
2025-07-11 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 4,008 -56 -1.38 3,968 3.23 1.4221
2025-04-11 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 4,064 -21 -0.51 3,844 2.70 1.4087
2025-01-14 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 4,085 -3 -0.07 3,743 3.26 1.3844
2024-10-07 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 4,088 -308 -7.01 3,624 -3.00 1.2832
2024-07-12 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 4,396 12 0.27 3,737 16.35 1.3681
2024-04-18 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 4,384 11 0.25 3,212 11.26 1.2015
2024-01-23 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 4,373 -10 -0.23 2,887 16.56 1.1481
2023-10-26 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 4,383 0 0.00 2,476 4.96 1.0630
2023-08-08 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 4,383 102 2.38 2,360 10.91 0.9778
2023-04-14 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 4,281 45 1.06 2,127 10.04 0.9170
2023-02-08 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 4,236 0 0.00 1,934 -3.40 0.8684
2022-10-19 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 4,236 4,236 2,001 0.9707
2022-07-15 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 0 -4,135 -100.00 0 -100.00
2022-04-22 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 4,135 0 0.00 2,381 1.45 0.9423
2022-02-04 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 4,135 -40 -0.96 2,347 21.67 0.8967
2021-10-21 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 4,175 0 0.00 1,929 16.77 0.8019
2021-07-14 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 4,175 4,175 1,652 0.6948
2021-04-27 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 0 -1,683 -100.00 0 -100.00
2021-01-20 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 1,683 -20 -1.17 634 -0.94 0.3089
2020-10-27 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 1,703 316 22.78 640 52.02 0.3382
2020-07-09 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 1,387 195 16.36 421 23.82 0.2496
2020-05-08 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 1,192 20 1.71 340 -1.16 0.2471
2020-01-09 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 1,172 0 0.00 344 1.78 0.1915
2019-10-30 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 1,172 0 0.00 338 3.05 0.2037
2019-07-25 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 1,172 0 0.00 328 15.49 0.2035
2019-05-06 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 1,172 0 0.00 284 18.83 0.1881
2019-01-17 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 1,172 0 0.00 239 -13.09 0.1768
2018-10-19 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 1,172 -50 -4.09 275 7.84 0.1667
2018-08-01 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 1,222 0 0.00 255 10.87 0.1741
2018-04-23 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 1,222 75 6.54 230 7.98 0.1777
2018-02-13 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 1,147 1,147 213 0.1622
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.