Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionMorse Asset Management, Inc
Latest Disclosed Ownership6,526 shares
Latest Disclosed Value $ 6,502,706
Morse Asset Management, Inc reports 1.78% increase in ownership of COST / Costco Wholesale Corporation

On May 14, 2026 - Morse Asset Management, Inc filed a 13F-HR form disclosing ownership of 6,526 shares of Costco Wholesale Corporation (MX:COST) valued at $6,502,706 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 6,412 shares of Costco Wholesale Corporation. This represents a change in shares of 1.78% 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)
2026-05-14 2026-03-31 13F COSTCO WHOLESALE CORPORATION COM Stock 22160K105 6,526 114 1.78 6,503 17.60 1.3516
2026-02-03 2025-12-31 13F COSTCO WHOLESALE CORPORATION COM Stock 22160K105 6,412 43 0.68 5,529 -6.21 1.1052
2025-11-14 2025-09-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 6,369 -5 -0.08 5,895 -6.56 1.1765
2025-08-15 2025-06-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 6,374 -298 -4.47 6,310 -0.02 1.3826
2025-05-05 2025-03-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 6,672 439 7.04 6,310 10.49 1.5928
2025-02-14 2024-12-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 6,233 -1,248 -16.68 5,711 -13.89 1.3047
2024-11-20 2024-09-30 13F/A-1 COSTCO WHSL CORP NEW COM Stock 22160K105 7,481 1,254 20.14 6,632 132,540.00 1.4315
2024-11-14 2024-09-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 7,493 1,266 7 1.4309
2024-08-14 2024-06-30 13F Costco Wholesale COM 22160K105 6,227 -253 -3.90 5 25.00 1.2836
2024-05-15 2024-03-31 13F Costco Wholesale COM 22160K105 6,480 0 0.00 5 0.00 1.2113
2024-02-15 2023-12-31 13F Costco Wholesale COM 22160K105 6,480 -545 -7.76 4 33.33 1.2589
2023-11-13 2023-09-30 13F Costco Wholesale COM 22160K105 7,025 251 3.71 4 0.00 1.2556
2023-08-14 2023-06-30 13F Costco Wholesale COM 22160K105 6,774 37 0.55 4 0.00 1.1092
2023-05-03 2023-03-31 13F Costco Wholesale COM 22160K105 6,737 399 6.30 3 50.00 1.1310
2023-02-08 2022-12-31 13F Costco Wholesale COM 22160K105 6,338 773 13.89 3 -99.92 1.0509
2022-11-14 2022-09-30 13F Costco Wholesale COM 22160K105 5,565 548 10.92 2,628 9.27 0.9922
2022-08-11 2022-06-30 13F Costco Wholesale COM 22160K105 5,017 1,027 25.74 2,405 4.66 0.7717
2022-05-12 2022-03-31 13F Costco Wholesale COM 22160K105 3,990 1,117 38.88 2,298 40.90 0.5712
2022-02-14 2021-12-31 13F Costco Wholesale COM 22160K105 2,873 448 18.47 1,631 49.63 0.3643
2021-11-09 2021-09-30 13F Costco Wholesale COM 22160K105 2,425 -1,000 -29.20 1,090 -19.56 0.2595
2021-08-13 2021-06-30 13F Costco Wholesale COM 22160K105 3,425 2,000 140.35 1,355 169.92 0.3275
2021-05-13 2021-03-31 13F/A-1 Costco Wholesale COM 22160K105 1,425 -6,380 -81.74 502 -82.93 0.1288
2021-05-13 2021-03-31 13F Costco Wholesale COM 22160K105 1,425 -6,380 502 0.1288
2021-02-11 2020-12-31 13F Costco Wholesale COM 22160K105 7,805 -35 -0.45 2,941 5.68 0.8155
2020-11-09 2020-09-30 13F Costco Wholesale COM 22160K105 7,840 75 0.97 2,783 18.22 0.8923
2020-08-14 2020-06-30 13F Costco Wholesale COM 22160K105 7,765 640 8.98 2,354 15.85 0.8386
2020-05-01 2020-03-31 13F Costco Wholesale COM 22160K105 7,125 -560 -7.29 2,032 -10.05 0.9701
2020-01-31 2019-12-31 13F Costco Wholesale COM 22160K105 7,685 675 9.63 2,259 11.83 0.7746
2019-11-05 2019-09-30 13F Costco Wholesale COM 22160K105 7,010 5,845 501.72 2,020 555.84 0.7550
2019-08-01 2019-06-30 13F Costco Wholesale COM 22160K105 1,165 250 27.32 308 38.74 0.0907
2019-05-02 2019-03-31 13F Costco Wholesale COM 22160K105 915 915 222 0.0666
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.