Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionOxbow Advisors, LLC
Latest Disclosed Ownership2,151 shares
Latest Disclosed Value $ 2,143,321
Oxbow Advisors, LLC reports 1.69% decrease in ownership of COST / Costco Wholesale Corporation

On April 27, 2026 - Oxbow Advisors, LLC filed a 13F-HR form disclosing ownership of 2,151 shares of Costco Wholesale Corporation (MX:COST) valued at $2,143,321 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 4, 2026 disclosing 2,188 shares of Costco Wholesale Corporation. This represents a change in shares of -1.69% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-04-27 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 2,151 -37 -1.69 2,143 13.63 0.1822
2026-02-04 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 2,188 0 0.00 1,887 -6.86 0.1660
2025-10-31 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 2,188 -131 -5.65 2,025 -11.76 0.1881
2025-07-29 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 2,319 -31 -1.32 2,296 3.29 0.2509
2025-05-01 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 2,350 -467 -16.58 2,223 -13.91 0.2348
2025-02-03 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 2,817 -72 -2.49 2,581 0.78 0.3038
2024-11-01 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 2,889 200 7.44 2,561 12.08 0.2541
2024-08-06 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 2,689 335 14.23 2,286 32.54 0.2682
2024-05-06 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 2,354 0 0.00 1,725 11.01 0.2367
2024-02-08 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 2,354 1,000 73.86 1,554 103.27 0.2358
2023-11-14 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 1,354 -100 -6.88 765 -2.30 0.1204
2023-08-04 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 1,454 137 10.40 783 19.57 0.1230
2023-04-26 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 1,317 0 0.00 654 8.82 0.1170
2023-02-01 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 1,317 -350 -21.00 601 -23.63 0.1133
2022-11-03 2022-09-30 13F Costco Wholesale Corp- COM 22160K105 1,667 47 2.90 787 1.42 0.1236
2022-08-10 2022-06-30 13F Costco Wholesale Corp- COM 22160K105 1,620 -125 -7.16 776 -22.79 0.1102
2022-05-09 2022-03-31 13F Costco Wholesale Corp- COM 22160K105 1,745 0 0.00 1,005 1.41 0.1010
2022-02-09 2021-12-31 13F Costco Wholesale Corp- COM 22160K105 1,745 235 15.56 991 45.95 0.0949
2021-11-10 2021-09-30 13F Costco Wholesale Corp- COM 22160K105 1,510 12 0.80 679 14.50 0.0691
2021-08-04 2021-06-30 13F Costco Wholesale Corp- COM 22160K105 1,498 0 0.00 593 12.31 0.0617
2021-05-11 2021-03-31 13F Costco Wholesale Corp- COM 22160K105 1,498 -467 -23.77 528 -28.65 0.0643
2021-02-02 2020-12-31 13F Costco Wholesale Corp- COM 22160K105 1,965 306 18.44 740 25.64 0.0947
2020-11-06 2020-09-30 13F Costco Wholesale Corp- COM 22160K105 1,659 184 12.47 589 31.77 0.0747
2020-08-12 2020-06-30 13F Costco Wholesale Corp- COM 22160K105 1,475 -200 -11.94 447 -6.49 0.0651
2020-05-06 2020-03-31 13F Costco Wholesale Corp- COM 22160K105 1,675 -32 -1.87 478 -4.78 0.0804
2020-02-06 2019-12-31 13F Costco Wholesale Corp- COM 22160K105 1,707 512 42.85 502 45.93 0.0580
2019-10-31 2019-09-30 13F Costco Wholesale Corp- COM 22160K105 1,195 0 0.00 344 8.86 0.0457
2019-08-07 2019-06-30 13F Costco Wholesale Corp- COM 22160K105 1,195 0 0.00 316 9.34 0.0381
2019-05-01 2019-03-31 13F Costco Wholesale Corp- COM 22160K105 1,195 0 0.00 289 18.93 0.0352
2019-02-12 2018-12-31 13F Costco Wholesale Corp- COM 22160K105 1,195 80 7.17 243 -7.25 0.0325
2018-11-06 2018-09-30 13F Costco Wholesale Corp- COM 22160K105 1,115 0 0.00 262 12.45 0.0316
2018-08-09 2018-06-30 13F Costco Wholesale Corp- COM 22160K105 1,115 0 0.00 233 10.95 0.0297
2018-04-30 2018-03-31 13F Costco Wholesale Corp- COM 22160K105 1,115 -44 -3.80 210 -2.78 0.0428
2018-01-30 2017-12-31 13F Costco Wholesale Corp- COM 22160K105 1,159 1,159 216 0.0404
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.