Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionMCF Advisors LLC
Latest Disclosed Ownership1,721 shares
Latest Disclosed Value $ 1,715,079
MCF Advisors LLC reports 48.11% increase in ownership of COST / Costco Wholesale Corporation

On May 11, 2026 - MCF Advisors LLC filed a 13F-HR form disclosing ownership of 1,721 shares of Costco Wholesale Corporation (MX:COST) valued at $1,715,079 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 1,162 shares of Costco Wholesale Corporation. This represents a change in shares of 48.11% 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)
2026-05-11 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 1,721 559 48.11 1,715 71.33 0.0751
2026-02-11 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 1,162 507 77.40 1,002 65.18 0.0554
2025-11-05 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 655 22 3.48 607 -3.19 0.0372
2025-07-15 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 633 -21 -3.21 627 1.29 0.0415
2025-05-06 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 654 20 3.15 619 6.55 0.0445
2025-01-17 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 634 0 0.00 581 3.39 0.0408
2024-10-24 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 634 -3 -0.47 562 3.70 0.0394
2024-08-05 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 637 8 1.27 542 17.35 0.0410
2024-04-16 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 629 -66 -9.50 461 -1.28 0.0357
2024-02-01 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 695 -1,510 -68.48 468 -62.49 0.0382
2023-10-19 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 2,205 225 11.36 1,246 16.79 0.1124
2023-07-24 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 1,980 3 0.15 1,066 8.55 0.0962
2023-04-18 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 1,977 45 2.33 983 11.46 0.0917
2023-01-31 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 1,932 77 4.15 882 0.57 0.0900
2022-11-09 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 1,855 1,296 231.84 876 226.87 0.0974
2022-08-11 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 559 0 0.00 268 -16.77 0.0283
2022-05-05 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 559 559 322 0.0302
2022-02-14 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -514 -100.00 0 -100.00
2021-11-12 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 514 21 4.26 231 18.46 0.0234
2021-08-10 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 493 158 47.16 195 65.25 0.0202
2021-05-13 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 335 310 1,240.00 118 1,211.11 0.0133
2021-02-09 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 25 0 0.00 9 0.00 0.0011
2020-11-12 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 25 0 0.00 9 12.50 0.0012
2020-08-11 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 25 0 0.00 8 14.29 0.0011
2020-04-24 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 25 0 0.00 7 0.00 0.0012
2020-02-07 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 25 0 0.00 7 0.00 0.0011
2019-10-22 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 25 0 0.00 7 0.00 0.0011
2019-08-06 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 25 0 0.00 7 16.67 0.0012
2019-05-07 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 25 -33 -56.90 6 -50.00 0.0010
2019-01-25 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 58 0 0.00 12 -14.29 0.0023
2018-10-24 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 58 0 0.00 14 16.67 0.0024
2018-07-20 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 58 0 0.00 12 9.09 0.0023
2018-05-10 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 58 -27 -31.76 11 -31.25 0.0022
2018-02-06 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 85 27 46.55 16 60.00 0.0030
2017-10-30 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 58 33 132.00 10 150.00 0.0020
2017-07-25 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 25 -75 -75.00 4 -76.47 0.0008
2017-05-02 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 100 100 17 0.0036
2016-05-04 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 0 -120 -100.00 0 -100.00
2016-02-08 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 120 120 19 0.0051
2015-07-24 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 0 -64 -100.00 0 -100.00
2015-04-29 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 64 64 10 0.0025
2015-02-04 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -364 -100.00 0 -100.00
2014-10-24 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 364 364 41 0.0121
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.