Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionQuadrant Private Wealth Management, LLC
Latest Disclosed Ownership3,026 shares
Latest Disclosed Value $ 3,015,263
Quadrant Private Wealth Management, LLC reports 3.24% increase in ownership of COST / Costco Wholesale Corporation

On May 6, 2026 - Quadrant Private Wealth Management, LLC filed a 13F-HR form disclosing ownership of 3,026 shares of Costco Wholesale Corporation (MX:COST) valued at $3,015,263 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 2,931 shares of Costco Wholesale Corporation. This represents a change in shares of 3.24% 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 3,026 95 3.24 3,015 19.31 0.4665
2026-01-26 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 2,931 39 1.35 2,527 -5.57 0.4144
2025-10-30 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 2,892 397 15.91 2,677 8.34 0.4887
2025-08-06 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 2,495 24 0.97 2,470 5.74 0.5122
2025-05-06 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 2,471 -29 -1.16 2,337 2.01 0.5821
2025-01-30 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 2,500 -24 -0.95 2,290 2.37 0.5634
2024-11-12 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 2,524 -195 -7.17 2,238 -3.20 0.5546
2024-08-13 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 2,719 52 1.95 2,311 18.33 0.5306
2024-05-15 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 2,667 -1,226 -31.49 1,954 -25.68 0.4943
2024-02-14 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 3,893 -34 -0.87 2,628 18.49 0.7282
2023-11-13 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 3,927 9 0.23 2,219 5.17 0.7465
2023-08-11 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 3,918 -14 -0.36 2,110 7.93 0.6109
2023-05-15 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 3,932 414 11.77 1,954 21.67 0.6094
2023-02-14 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 3,518 341 10.73 1,606 5.45 0.5386
2022-08-15 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 3,177 390 13.99 1,523 -5.11 0.6253
2022-05-12 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 2,787 209 8.11 1,605 9.63 0.5986
2022-02-08 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 2,578 -4,001 -60.81 1,464 -50.47 0.5440
2021-11-12 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 6,579 11 0.17 2,956 13.74 1.2206
2021-08-16 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 6,568 154 2.40 2,599 14.95 1.0540
2021-05-17 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 6,414 3,441 115.74 2,261 101.88 0.9833
2021-02-12 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 2,973 289 10.77 1,120 17.52 0.4988
2020-11-12 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 2,684 965 56.14 953 82.92 0.4795
2020-08-04 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 1,719 1,719 521 0.3007
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.