Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionCI Private Wealth, LLC
Latest Disclosed Ownership758,986 shares
Latest Disclosed Value $ 732,824,833
CI Private Wealth, LLC reports 11.69% decrease in ownership of COST / Costco Wholesale Corporation

On May 15, 2026 - CI Private Wealth, LLC filed a 13F-HR form disclosing ownership of 758,986 shares of Costco Wholesale Corporation (MX:COST) valued at $732,824,833 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on March 9, 2026 disclosing 859,419 shares of Costco Wholesale Corporation. This represents a change in shares of -11.69% 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)
2026-05-15 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 758,986 -100,433 -11.69 732,825 -1.16 1.0213
2026-03-09 2025-12-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 859,419 206,982 31.72 741,440 22.83 1.0082
2026-02-19 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 6,125,405 5,472,968 601,117 0.2262
2025-11-14 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 652,437 -194,943 -23.01 603,637 -28.04 0.9512
2025-09-26 2025-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 847,380 -379,915 -30.96 838,855 -27.73 1.1161
2025-08-15 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 848,420 -378,875 836,559 0.8809
2025-05-14 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 1,227,295 -146,873 -10.69 1,160,758 -7.47 1.8958
2025-02-10 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 1,374,168 -7,278 -0.53 1,254,435 2.43 2.0817
2024-11-12 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 1,381,446 -42,804 -3.01 1,224,680 1.16 1.9115
2024-08-13 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 1,424,250 -9,558 -0.67 1,210,651 15.25 2.1089
2024-05-09 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 1,433,808 466,082 48.16 1,050,451 64.44 1.8701
2024-02-09 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 967,726 111,239 12.99 638,800 32.02 1.1749
2023-11-03 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 856,487 2,037 0.24 483,885 5.29 1.1120
2023-08-10 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 854,450 57,210 7.18 459,590 16.02 1.0603
2023-05-15 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 797,240 258,821 48.07 396,127 61.23 1.0637
2023-02-15 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 538,419 538,419 245,698 0.8924
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.