Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionBigSur Wealth Management LLC
Latest Disclosed Ownership2,740 shares
Latest Disclosed Value $ 2,730,218
BigSur Wealth Management LLC reports 11.38% decrease in ownership of COST / Costco Wholesale Corporation

On April 22, 2026 - BigSur Wealth Management LLC filed a 13F-HR form disclosing ownership of 2,740 shares of Costco Wholesale Corporation (MX:COST) valued at $2,730,218 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 3,092 shares of Costco Wholesale Corporation. This represents a change in shares of -11.38% 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)
2026-04-22 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 2,740 -352 -11.38 2,730 2.40 0.7659
2026-01-27 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 3,092 0 0.00 2,666 -6.85 0.6468
2025-10-14 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 3,092 -21 -0.67 2,862 -7.11 0.7010
2025-07-15 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 3,113 30 0.97 3,082 5.69 0.7780
2025-04-16 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 3,083 -427 -12.17 2,916 -9.36 0.7898
2025-01-16 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 3,510 0 0.00 3,216 3.38 0.9190
2024-10-16 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 3,510 0 0.00 3,112 4.29 0.8572
2024-07-22 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 3,510 -270 -7.14 2,983 7.73 0.9135
2024-05-22 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 3,780 2,000 112.36 2,769 130.56 0.8678
2024-02-12 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 1,780 0 0.00 1,202 19.50 0.5720
2023-11-13 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 1,780 0 0.00 1,006 4.91 0.5069
2023-08-14 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 1,780 -70 -3.78 958 4.24 0.4580
2023-05-12 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 1,850 -150 -7.50 919 0.66 0.4313
2023-02-09 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 2,000 0 0.00 913 -3.39 0.4399
2022-11-09 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 2,000 0 0.00 945 -1.46 0.4779
2022-08-10 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 2,000 0 0.00 959 -16.75 0.4518
2022-05-05 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 2,000 1,500 300.00 1,152 305.63 0.4488
2022-02-07 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 500 0 0.00 284 26.22 0.1111
2021-11-01 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 500 500 225 0.1011
2021-07-29 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 0 -710 -100.00 0 -100.00
2021-05-06 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 710 710 250 0.1283
2018-08-01 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 0 -1,900 -100.00 0 -100.00
2018-05-02 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 1,900 0 0.00 358 1.13 0.2552
2018-02-01 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 1,900 0 0.00 354 13.46 0.3519
2017-11-02 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 1,900 0 0.00 312 4.70 0.3136
2017-08-14 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 1,900 0 0.00 298 -12.61 0.3023
2017-05-12 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 1,900 0 0.00 341 12.17 0.3689
2017-02-09 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 1,900 1,900 304 0.4067
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.