코스트코 도매공사
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionGSB Wealth Management, LLC
Latest Disclosed Ownership4,126 shares
Latest Disclosed Value $ 4,111,233
GSB Wealth Management, LLC reports 1.50% increase in ownership of COST / Costco Wholesale Corporation

On April 20, 2026 - GSB Wealth Management, LLC filed a 13F-HR form disclosing ownership of 4,126 shares of Costco Wholesale Corporation (MX:COST) valued at $4,111,233 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 4,065 shares of Costco Wholesale Corporation. This represents a change in shares of 1.50% 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)
2026-04-20 2026-03-31 13F COSTCO WHOLESALE CORPORATION COM COM 22160K105 4,126 61 1.50 4,111 17.29 0.9281
2026-02-05 2025-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 4,065 515 14.51 3,505 6.70 0.7926
2025-10-21 2025-09-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 3,550 8 0.23 3,286 -6.30 0.7445
2025-07-15 2025-06-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 3,542 -130 -3.54 3,507 0.95 0.8586
2025-04-18 2025-03-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 3,672 -122 -3.22 3,473 -0.09 0.9128
2025-01-21 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 3,794 -138 -3.51 3,477 -0.29 0.8981
2024-10-25 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 3,932 -66 -1.65 3,486 2.59 0.8922
2024-07-18 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 3,998 23 0.58 3,398 16.69 0.9273
2024-05-02 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 3,975 -185 -4.45 2,912 6.05 0.8195
2024-02-13 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 4,160 -39 -0.93 2,746 15.77 0.8441
2023-11-13 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 4,199 -50 -1.18 2,372 3.72 0.7942
2023-08-08 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 4,249 340 8.70 2,288 17.77 0.7440
2023-05-18 2023-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 3,909 -67 -1.69 1,942 7.06 0.6351
2023-05-15 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 3,909 -67 1,942 0.7221
2023-02-16 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 3,976 -673 -14.48 1,815 -17.40 0.6478
2022-10-18 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 4,649 -387 -7.68 2,196 -8.99 0.7962
2022-07-20 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 5,036 -1,199 -19.23 2,413 -32.79 0.8225
2022-05-02 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 6,235 -215 -3.33 3,590 -1.97 1.0473
2022-02-11 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 6,450 3,855 148.55 3,662 214.07 1.0514
2021-10-22 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 2,595 -4,057 -60.99 1,166 -55.70 0.5991
2021-07-29 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 6,652 32 0.48 2,632 12.77 0.8199
2021-08-11 2021-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 6,620 2,056 45.05 2,334 73.79 0.7764
2021-05-05 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 152,245 147,681 52,863 0.8522
2020-02-12 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 4,564 -134 -2.85 1,343 -0.89 0.9303
2019-11-12 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 4,698 4,698 1,355 0.9199
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.