Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionCornerstone Advisory, LLC
Latest Disclosed Ownership3,071 shares
Latest Disclosed Value $ 3,060,033
Cornerstone Advisory, LLC reports 3.61% increase in ownership of COST / Costco Wholesale Corporation

On May 4, 2026 - Cornerstone Advisory, LLC filed a 13F-HR form disclosing ownership of 3,071 shares of Costco Wholesale Corporation (MX:COST) valued at $3,060,033 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 2,964 shares of Costco Wholesale Corporation. This represents a change in shares of 3.61% 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)
2026-05-04 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 3,071 107 3.61 3,060 19.77 0.2897
2026-01-28 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 2,964 653 28.26 2,556 19.45 0.2437
2025-11-07 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 2,311 -74 -3.10 2,140 -9.36 0.2101
2025-07-30 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 2,385 14 0.59 2,361 -1.46 0.2535
2025-05-07 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 2,371 -59 -2.43 2,395 -8.03 0.2796
2025-02-18 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 2,430 114 4.92 2,605 26.84 0.2959
2024-11-12 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 2,316 140 6.43 2,053 11.03 0.2702
2024-08-14 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 2,176 37 1.73 1,850 18.00 0.2602
2024-05-08 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 2,139 179 9.13 1,567 21.19 0.2234
2024-02-13 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 1,960 206 11.74 1,294 30.47 0.2017
2023-11-14 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 1,754 49 2.87 991 8.07 0.1734
2023-07-20 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 1,705 -84 -4.70 918 3.27 0.1613
2023-05-04 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 1,789 475 36.15 889 48.25 0.1600
2023-02-13 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 1,314 5 0.38 600 -3.07 0.1182
2022-10-26 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 1,309 9 0.69 618 -0.96 0.1380
2022-08-02 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 1,300 -339 -20.68 624 -33.90 0.1428
2022-05-20 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 1,639 -94 -5.42 944 -4.07 0.1439
2022-02-23 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 1,733 -456 -20.83 984 0.00 0.1414
2021-11-16 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 2,189 25 1.16 984 14.95 0.1629
2021-08-16 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 2,164 206 10.52 856 24.06 0.1442
2021-05-13 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 1,958 1 0.05 690 -6.38 0.1306
2021-05-11 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 1,957 -250 -11.33 737 -5.99 0.1492
2020-11-12 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 2,207 0 0.00 784 17.19 0.1829
2020-08-10 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 2,207 348 18.72 669 26.23 0.1745
2020-05-11 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 1,859 873 88.54 530 82.76 0.1611
2020-02-12 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 986 20 2.07 290 4.32 0.0600
2019-11-12 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 966 166 20.75 278 31.75 0.0600
2019-08-08 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 800 800 211 0.0457
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.