Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionHighMark Wealth Management LLC
Latest Disclosed Ownership438 shares
Latest Disclosed Value $ 436,351
HighMark Wealth Management LLC reports 5.60% decrease in ownership of COST / Costco Wholesale Corporation

On May 6, 2026 - HighMark Wealth Management LLC filed a 13F-HR form disclosing ownership of 438 shares of Costco Wholesale Corporation (MX:COST) valued at $436,351 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 464 shares of Costco Wholesale Corporation. This represents a change in shares of -5.60% 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)
2026-05-06 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 438 -26 -5.60 436 9.00 0.1777
2026-02-05 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 464 -23 -4.72 400 -13.04 0.1631
2025-10-20 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 487 -14 -2.79 460 -7.07 0.2027
2025-07-21 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 501 0 0.00 496 4.65 0.2424
2025-04-24 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 501 116 30.13 474 34.38 0.2798
2025-01-31 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 385 2 0.52 353 3.83 0.2027
2024-10-17 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 383 -1 -0.26 339 3.99 0.1857
2024-07-29 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 384 0 0.00 326 13.19 0.1963
2024-04-29 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 384 2 0.52 288 14.29 0.1786
2024-01-23 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 382 -25 -6.14 252 10.04 0.1859
2023-10-18 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 407 0 0.00 230 4.57 0.1907
2023-07-26 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 407 0 0.00 219 8.42 0.1647
2023-04-21 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 407 6 1.50 202 10.38 0.1577
2023-02-02 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 401 -20 -4.75 183 -8.04 0.1380
2022-10-21 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 421 25 6.31 199 4.74 0.1699
2022-07-19 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 396 0 0.00 190 -16.67 0.1528
2022-04-25 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 396 0 0.00 228 1.33 0.1525
2022-01-20 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 396 0 0.00 225 26.40 0.1426
2021-11-01 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 396 0 0.00 178 14.10 0.1310
2021-08-02 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 396 -6 -1.49 156 9.86 0.1147
2021-04-22 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 402 307 323.16 142 294.44 0.1132
2021-01-27 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 95 1 1.06 36 9.09 0.0309
2020-10-26 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 94 0 0.00 33 13.79 0.0297
2020-07-22 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 94 0 0.00 29 11.54 0.0319
2020-11-19 2020-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 94 -23 -19.66 26 -23.53 0.0314
2020-04-30 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 94 -23 27 32,346.9664
2020-03-19 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 117 117 34 0.0363
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.