Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionWulff, Hansen & Co.
Latest Disclosed Ownership2,047 shares
Latest Disclosed Value $ 2,039,693
Wulff, Hansen & Co. reports 1.39% increase in ownership of COST / Costco Wholesale Corporation

On May 7, 2026 - Wulff, Hansen & Co. filed a 13F-HR form disclosing ownership of 2,047 shares of Costco Wholesale Corporation (MX:COST) valued at $2,039,693 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 2,019 shares of Costco Wholesale Corporation. This represents a change in shares of 1.39% 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)
2026-05-07 2026-03-31 13F COSTCO WHSL CORP COM 22160K105 2,047 28 1.39 2,040 17.12 2.0833
2026-02-03 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 2,019 -15 -0.74 1,741 -7.49 1.4607
2025-11-07 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 2,034 -1,558 -43.37 1,883 -47.06 1.6206
2025-08-12 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 3,592 63 1.79 3,556 6.53 3.0434
2025-05-14 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 3,529 1,249 54.78 3,338 1,504.33 3.0432
2025-02-11 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 2,280 80 3.64 209 -89.33 0.1976
2024-11-12 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 2,200 465 26.80 1,950 32.29 1.7668
2024-08-14 2024-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 1,735 250 16.84 1,475 35.60 1.4560
2024-08-09 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 1,474,733 1,473,248 2 0.1515
2024-05-02 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 1,485 825 125.00 1,088 149.89 1.0863
2024-02-12 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 660 -6,092 -90.23 436 14.17 0.4836
2023-11-08 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 6,752 6,142 1,006.89 381 16.16 0.4451
2023-08-09 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 610 0 0.00 328 8.25 0.3676
2023-05-08 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 610 0 0.00 303 8.99 0.3459
2023-02-07 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 610 0 0.00 278 -3.47 0.3381
2022-11-04 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 610 0 0.00 288 -1.37 0.3602
2022-07-26 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 610 -105 -14.69 292 -29.13 0.3308
2022-05-10 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 715 0 0.00 412 1.48 0.3922
2022-02-14 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 715 715 406 0.3507
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.