Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionVestmark Advisory Solutions, Inc.
Latest Disclosed Ownership22,637 shares
Latest Disclosed Value $ 22,557,520
Vestmark Advisory Solutions, Inc. reports 62.12% increase in ownership of COST / Costco Wholesale Corporation

On May 15, 2026 - Vestmark Advisory Solutions, Inc. filed a 13F-HR form disclosing ownership of 22,637 shares of Costco Wholesale Corporation (MX:COST) valued at $22,557,520 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 13,963 shares of Costco Wholesale Corporation. This represents a change in shares of 62.12% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-15 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 22,637 8,674 62.12 22,558 87.35 0.1550
2026-02-06 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 13,963 7,290 109.25 12,040 94.95 0.1625
2025-11-10 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 6,673 997 17.57 6,177 9.91 0.1177
2025-08-06 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 5,676 -3,226 -36.24 5,619 -33.26 0.0812
2025-05-13 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 8,902 3,928 78.97 8,419 84.75 0.2168
2025-02-06 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 4,974 -70 -1.39 4,558 1.92 0.1569
2024-11-14 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 5,044 16 0.32 4,472 4.63 0.1665
2024-08-12 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 5,028 -48 -0.95 4,274 14.93 0.1784
2024-05-15 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 5,076 -214 -4.05 3,719 6.50 0.1602
2024-02-06 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 5,290 -46 -0.86 3,492 15.83 0.1774
2023-11-06 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 5,336 -1,022 -16.07 3,014 -11.92 0.2191
2023-08-07 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 6,358 -122 -1.88 3,423 6.27 0.1304
2023-05-09 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 6,480 -920 -12.43 3,221 -4.68 0.1395
2023-01-20 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 7,400 1,469 24.77 3,379 20.60 0.1646
2022-11-03 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 5,931 1,626 37.77 2,801 35.71 0.1561
2022-08-04 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 4,305 2,913 209.27 2,064 157.68 0.1179
2022-04-27 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 1,392 -312 -18.31 801 -17.17 0.0453
2022-01-31 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 1,704 252 17.36 967 48.09 0.0546
2021-11-15 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 1,452 -39 -2.62 653 10.68 0.0442
2021-08-09 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 1,491 154 11.52 590 25.27 0.0420
2021-05-10 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 1,337 -2,400 -64.22 471 -66.55 0.0418
2021-02-04 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 3,737 -11 -0.29 1,408 5.79 0.1580
2020-10-19 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 3,748 71 1.93 1,331 19.37 0.1788
2020-08-13 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 3,677 180 5.15 1,115 11.84 0.1725
2020-05-06 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 3,497 3,497 997 0.1949
2020-02-14 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -3,304 -100.00 0 -100.00
2019-11-05 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 3,304 -22 -0.66 952 8.30 0.1544
2019-08-20 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 3,326 403 13.79 879 24.15 0.1504
2019-05-14 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 2,923 2,923 708 0.1262
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.