Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionBbr Partners, Llc
Latest Disclosed Ownership2,910 shares
Latest Disclosed Value $ 2,899,816
Bbr Partners, Llc reports 0.07% increase in ownership of COST / Costco Wholesale Corporation

On May 12, 2026 - Bbr Partners, Llc filed a 13F-HR form disclosing ownership of 2,910 shares of Costco Wholesale Corporation (MX:COST) valued at $2,899,816 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 2,908 shares of Costco Wholesale Corporation. This represents a change in shares of 0.07% 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)
2026-05-12 2026-03-31 13F COSTCO WHSL CORP COM 22160K105 2,910 2 0.07 2,900 15.64 0.1618
2026-02-10 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 2,908 -18 -0.62 2,508 -7.42 0.1346
2025-11-07 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 2,926 -84 -2.79 2,708 -9.10 0.1562
2025-08-14 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 3,010 -5 -0.17 2,980 4.49 0.1855
2025-05-14 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 3,015 -151 -4.77 2,851 -1.69 0.2014
2025-02-07 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 3,166 -443 -12.27 2,901 -9.35 0.2024
2024-11-13 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 3,609 1,508 71.78 3,199 79.22 0.2438
2024-08-05 2024-06-30 13F Costco Whsl Corp New Com COM 22160K105 2,101 -387 -15.55 1,785 -2.08 0.1463
2024-05-14 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 2,488 458 22.56 1,823 36.04 0.1460
2024-02-13 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 2,030 964 90.43 1,340 122.59 0.1370
2023-11-14 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 1,066 577 118.00 602 128.90 0.0678
2023-08-08 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 489 30 6.54 263 15.35 0.0291
2023-05-11 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 459 459 228 0.0263
2023-02-10 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -2,410 -100.00 0 -100.00
2022-11-10 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 2,410 -717 -22.93 1,138 -24.08 0.1458
2022-08-12 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 3,127 67 2.19 1,499 -14.93 0.1752
2022-05-16 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 3,060 567 22.74 1,762 24.52 0.1662
2022-02-08 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 2,493 0 0.00 1,415 26.34 0.1662
2021-11-12 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 2,493 11 0.44 1,120 14.05 0.0927
2021-08-13 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 2,482 -25 -1.00 982 11.09 0.0776
2021-05-17 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 2,507 -1 -0.04 884 -6.46 0.0726
2021-02-16 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 2,508 26 1.05 945 7.26 0.0783
2020-11-12 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 2,482 645 35.11 881 58.17 0.0755
2020-08-11 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 1,837 837 83.70 557 95.44 0.0703
2020-05-14 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 1,000 -1,030 -50.74 285 -52.26 0.0424
2020-02-14 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 2,030 1,320 185.92 597 192.65 0.0654
2019-11-12 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 710 710 204 0.0311
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.