Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionPinnacle Wealth Planning Services, Inc.
Latest Disclosed Ownership2,388 shares
Latest Disclosed Value $ 2,379,020
Pinnacle Wealth Planning Services, Inc. reports 0.29% increase in ownership of COST / Costco Wholesale Corporation

On May 11, 2026 - Pinnacle Wealth Planning Services, Inc. filed a 13F-HR form disclosing ownership of 2,388 shares of Costco Wholesale Corporation (MX:COST) valued at $2,379,020 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 2,381 shares of Costco Wholesale Corporation. This represents a change in shares of 0.29% 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)
2026-05-11 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 2,388 7 0.29 2,379 15.94 0.2458
2026-02-13 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 2,381 72 3.12 2,053 -3.93 0.2143
2025-11-13 2025-09-30 13F COSTCO WHOLESALE COM 22160K105 2,309 199 9.43 2,137 2.30 0.2504
2025-08-11 2025-06-30 13F COSTCO WHOLESALE COM 22160K105 2,110 23 1.10 2,089 5.83 0.2747
2025-05-15 2025-03-31 13F COSTCO WHOLESALE COM 22160K105 2,087 49 2.40 1,974 5.68 0.2967
2025-02-27 2024-12-31 13F/A-1 COSTCO WHOLESALE COM 22160K105 2,038 -199 -8.90 1,867 -5.85 0.2806
2025-02-06 2024-12-31 13F COSTCO WHOLESALE COM 22160K105 2,038 -199 1,867 0.2607
2024-11-13 2024-09-30 13F COSTCO WHOLESALE Stock 22160K105 2,237 6 0.27 1,983 4.59 0.2694
2024-08-09 2024-06-30 13F COSTCO WHOLESALE Stock 22160K105 2,231 -42 -1.85 1,896 13.87 0.2709
2024-05-10 2024-03-31 13F COSTCO WHOLESALE Stock 22160K105 2,273 -6 -0.26 1,665 10.70 0.2440
2024-02-08 2023-12-31 13F COSTCO WHOLESALE Stock 22160K105 2,279 13 0.57 1,504 17.50 0.2363
2023-11-08 2023-09-30 13F COSTCO WHOLESALE Stock 22160K105 2,266 -14 -0.61 1,280 4.32 0.2110
2023-08-07 2023-06-30 13F COSTCO WHOLESALE Stock 22160K105 2,280 32 1.42 1,228 9.95 0.1982
2023-05-03 2023-03-31 13F COSTCO WHOLESALE Stock 22160K105 2,248 187 9.07 1,117 18.72 0.1856
2023-02-13 2022-12-31 13F COSTCO WHOLESALE Stock 22160K105 2,061 -402 -16.32 941 -19.24 0.1672
2022-11-09 2022-09-30 13F COSTCO WHOLESALE Stock 22160K105 2,463 276 12.62 1,164 11.07 0.2152
2022-08-03 2022-06-30 13F COSTCO WHOLESALE Stock 22160K105 2,187 -176 -7.45 1,048 -23.00 0.1883
2022-04-20 2022-03-31 13F COSTCO WHOLESALE Stock 22160K105 2,363 131 5.87 1,361 7.42 0.2480
2022-01-21 2021-12-31 13F COSTCO WHOLESALE Stock 22160K105 2,232 184 8.98 1,267 37.72 0.2475
2021-10-29 2021-09-30 13F COSTCO WHOLESALE Stock 22160K105 2,048 19 0.94 920 14.57 0.2034
2021-08-02 2021-06-30 13F COSTCO WHOLESALE Stock 22160K105 2,029 408 25.17 803 40.38 0.1868
2021-04-29 2021-03-31 13F COSTCO WHOLESALE Stock 22160K105 1,621 -763 -32.01 572 -36.30 0.1467
2021-02-12 2020-12-31 13F COSTCO WHOLESALE Stock 22160K105 2,384 28 1.19 898 7.42 0.2145
2020-11-03 2020-09-30 13F COSTCO WHOLESALE Stock 22160K105 2,356 -123 -4.96 836 11.32 0.2761
2020-07-27 2020-06-30 13F COSTCO WHOLESALE Stock 22160K105 2,479 -68 -2.67 751 3.59 0.2439
2020-05-11 2020-03-31 13F COSTCO WHOLESALE Stock 22160K105 2,547 509 24.98 725 21.04 0.3443
2020-02-07 2019-12-31 13F COSTCO WHOLESALE Stock 22160K105 2,038 137 7.21 599 9.51 0.2818
2019-10-31 2019-09-30 13F COSTCO WHOLESALE Stock 22160K105 1,901 375 24.57 547 35.40 0.2978
2019-08-06 2019-06-30 13F COSTCO WHOLESALE Stock 22160K105 1,526 107 7.54 404 17.44 0.2438
2019-05-08 2019-03-31 13F COSTCO WHOLESALE Stock 22160K105 1,419 -438 -23.59 344 -9.23 0.2309
2019-03-01 2018-12-31 13F COSTCO WHOLESALE Stock 22160K105 1,857 -49 -2.57 379 -15.40 0.2425
2019-02-28 2018-09-30 13F COSTCO WHOLESALE Stock 22160K105 1,906 60 3.25 448 16.36 0.4096
2019-02-28 2018-06-30 13F COSTCO WHOLESALE Stock 22160K105 1,846 212 12.97 385 25.00 0.3740
2019-02-28 2018-03-31 13F COSTCO WHOLESALE Stock 22160K105 1,634 1,198 274.77 308 280.25 0.3168
2018-02-12 2017-12-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 436 436 81 0.1650
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.