Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionClaro Advisors LLC
Latest Disclosed Ownership2,441 shares
Latest Disclosed Value $ 2,432,557
Claro Advisors LLC reports 16.02% increase in ownership of COST / Costco Wholesale Corporation

On April 21, 2026 - Claro Advisors LLC filed a 13F-HR form disclosing ownership of 2,441 shares of Costco Wholesale Corporation (MX:COST) valued at $2,432,557 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 2,104 shares of Costco Wholesale Corporation. This represents a change in shares of 16.02% 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)
2026-04-21 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 2,441 337 16.02 2,433 34.07 0.2930
2026-02-17 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 2,104 101 5.04 1,815 -2.16 0.2472
2025-11-12 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 2,003 41 2.09 1,854 -4.53 0.2704
2025-08-05 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 1,962 -773 -28.26 1,943 -24.90 0.3207
2025-05-12 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 2,735 99 3.76 2,587 7.08 0.3461
2025-01-13 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 2,636 -141 -5.08 2,416 -1.87 0.3264
2024-11-07 2024-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 2,777 495 21.69 2,462 26.92 0.3181
2024-10-17 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 4,215 1,933 444 0.0573
2024-07-31 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 2,282 251 12.36 1,940 30.40 0.3028
2024-04-18 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 2,031 89 4.58 1,488 15.99 0.2583
2024-01-22 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 1,942 71 3.79 1,282 21.40 0.2776
2023-10-10 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 1,871 143 8.28 1,057 13.55 0.2642
2023-08-08 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 1,728 65 3.91 930 12.59 0.2311
2023-04-17 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 1,663 50 3.10 826 12.23 0.2426
2023-03-13 2022-12-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 1,613 190 13.35 736 7.92 0.2408
2023-02-14 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 1,613 190 736 0.2403
2022-11-18 2022-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 1,423 0 0.00 682 0.00 0.2711
2022-11-14 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 1,423 0 682 0.2711
2022-08-12 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 1,423 264 22.78 682 3.65 0.2711
2022-05-16 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 1,159 0 0.00 658 0.00 0.2367
2022-02-14 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 1,159 125 12.09 658 41.51 0.2367
2021-11-15 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 1,034 -13 -1.24 465 12.32 0.1956
2021-08-13 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 1,047 1 0.10 414 12.20 0.1863
2021-05-17 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 1,046 -136 -11.51 369 -17.08 0.1869
2021-02-12 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 1,182 336 39.72 445 48.33 0.2365
2020-11-16 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 846 59 7.50 300 25.52 0.1901
2020-08-14 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 787 787 239 0.1645
2019-05-09 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 0 -296 -100.00 0 -100.00
2019-02-14 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 296 296 70 0.0560
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.