Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionDearborn Partners Llc
Latest Disclosed Ownership32,064 shares
Latest Disclosed Value $ 31,949,184
Dearborn Partners Llc reports 8.03% decrease in ownership of COST / Costco Wholesale Corporation

On May 12, 2026 - Dearborn Partners Llc filed a 13F-HR form disclosing ownership of 32,064 shares of Costco Wholesale Corporation (MX:COST) valued at $31,949,184 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 34,863 shares of Costco Wholesale Corporation. This represents a change in shares of -8.03% 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)
2026-05-12 2026-03-31 13F Costco Wholesale COM 22160K105 32,064 -2,799 -8.03 31,949 6.27 1.6712
2026-02-11 2025-12-31 13F Costco Wholesale COM 22160K105 34,863 -1,035 -2.88 30,064 -9.53 1.5013
2025-11-10 2025-09-30 13F Costco Wholesale COM 22160K105 35,898 -804 -2.19 33,229 -8.55 1.5581
2025-08-14 2025-06-30 13F Costco Wholesale COM 22160K105 36,702 2,416 7.05 36,333 12.05 1.7199
2025-05-08 2025-03-31 13F Costco Wholesale COM 22160K105 34,286 -7,093 -17.14 32,427 -14.47 1.5566
2025-02-07 2024-12-31 13F Costco Wholesale COM 22160K105 41,379 -921 -2.18 37,915 1.11 1.5886
2024-11-06 2024-09-30 13F Costco Wholesale COM 22160K105 42,300 -14,748 -25.85 37,500 -22.67 1.5222
2024-07-26 2024-06-30 13F Costco Wholesale COM 22160K105 57,048 -737 -1.28 48,490 14.54 2.0966
2024-05-08 2024-03-31 13F Costco Wholesale COM 22160K105 57,785 -17,543 -23.29 42,335 -14.86 1.8174
2024-01-26 2023-12-31 13F Costco Wholesale COM 22160K105 75,328 -1,485 -1.93 49,723 14.58 1.8112
2023-11-01 2023-09-30 13F Costco Wholesale COM 22160K105 76,813 111 0.14 43,396 5.09 1.7029
2023-08-03 2023-06-30 13F Costco Wholesale COM 22160K105 76,702 -37 -0.05 41,295 8.30 1.5801
2023-05-04 2023-03-31 13F Costco Wholesale COM 22160K105 76,739 -1,087 -1.40 38,129 7.32 1.4999
2023-02-02 2022-12-31 13F Costco Wholesale COM 22160K105 77,826 -1,906 -2.39 35,528 -5.65 1.4339
2022-11-21 2022-09-30 13F/A-1 Costco Wholesale COM 22160K105 79,732 756 0.96 37,655 -0.52 1.6609
2022-10-25 2022-09-30 13F Costco Wholesale COM 22160K105 79,732 756 37,655 1.5525
2022-07-20 2022-06-30 13F Costco Wholesale COM 22160K105 78,976 -21,723 -21.57 37,852 -34.72 1.5988
2022-05-04 2022-03-31 13F Costco Wholesale COM 22160K105 100,699 1,031 1.03 57,988 2.49 2.1991
2022-01-28 2021-12-31 13F Costco Wholesale COM 22160K105 99,668 -753 -0.75 56,581 25.39 2.0513
2021-10-27 2021-09-30 13F Costco Wholesale COM 22160K105 100,421 99 0.10 45,124 13.68 1.8328
2021-07-26 2021-06-30 13F Costco Wholesale COM 22160K105 100,322 895 0.90 39,694 13.26 1.5961
2021-04-29 2021-03-31 13F Costco Wholesale COM 22160K105 99,427 2,705 2.80 35,046 -3.83 1.4933
2021-01-27 2020-12-31 13F Costco Wholesale COM 22160K105 96,722 1,748 1.84 36,443 8.09 1.6590
2020-10-20 2020-09-30 13F Costco Wholesale COM 22160K105 94,974 82 0.09 33,716 17.18 1.6787
2020-07-30 2020-06-30 13F Costco Wholesale COM 22160K105 94,892 -2,591 -2.66 28,772 3.52 1.5548
2020-05-11 2020-03-31 13F Costco Wholesale COM 22160K105 97,483 2,740 2.89 27,795 -0.19 1.7240
2020-01-28 2019-12-31 13F Costco Wholesale COM 22160K105 94,743 9,628 11.31 27,847 13.56 1.4183
2019-10-29 2019-09-30 13F Costco Wholesale COM 22160K105 85,115 70,924 499.78 24,522 553.92 1.4179
2019-07-29 2019-06-30 13F Costco Wholesale COM 22160K105 14,191 10,057 243.28 3,750 274.63 0.2290
2019-05-01 2019-03-31 13F Costco Wholesale COM 22160K105 4,134 123 3.07 1,001 22.52 0.0668
2019-02-04 2018-12-31 13F Costco Wholesale COM 22160K105 4,011 1,574 64.59 817 42.83 0.0631
2018-10-24 2018-09-30 13F Costco Wholesale COM 22160K105 2,437 350 16.77 572 31.19 0.0401
2018-08-14 2018-06-30 13F Costco Wholesale COM 22160K105 2,087 -361 -14.75 436 -5.42 0.0341
2018-05-01 2018-03-31 13F Costco Wholesale COM 22160K105 2,448 18 0.74 461 1.99 0.0356
2018-02-02 2017-12-31 13F Costco Wholesale COM 22160K105 2,430 -85 -3.38 452 9.44 0.0325
2017-11-13 2017-09-30 13F Costco Wholesale COM 22160K105 2,515 85 3.50 413 6.17 0.0304
2017-08-09 2017-06-30 13F Costco Wholesale COM 22160K105 2,430 0 0.00 389 -4.42 0.0287
2017-05-15 2017-03-31 13F Costco Wholesale COM 22160K105 2,430 -12 -0.49 407 4.09 0.0317
2017-01-26 2016-12-31 13F Costco Wholesale COM 22160K105 2,442 -425 -14.82 391 -10.53 0.0327
2016-10-24 2016-09-30 13F Costco Wholesale COM 22160K105 2,867 0 0.00 437 -2.89 0.0369
2016-07-18 2016-06-30 13F Costco Wholesale COM 22160K105 2,867 33 1.16 450 0.67 0.0390
2016-04-19 2016-03-31 13F Costco Wholesale COM 22160K105 2,834 -50 -1.73 447 -4.08 0.0416
2016-01-21 2015-12-31 13F Costco Wholesale COM 22160K105 2,884 -437 -13.16 466 -2.92 0.0434
2015-10-19 2015-09-30 13F Costco Wholesale COM 22160K105 3,321 -1,483 -30.87 480 -26.04 0.0481
2015-08-13 2015-06-30 13F Costco Wholesale COM 22160K105 4,804 -7,204 -59.99 649 -64.32 0.0626
2015-04-21 2015-03-31 13F Costco Wholesale COM 22160K105 12,008 12,008 1,819 0.1590
2015-01-28 2014-12-31 13F Costco Wholesale COM 22160K105 0 -12,719 -100.00 0 -100.00
2014-10-29 2014-09-30 13F Costco Wholesale COM 22160K105 12,719 1,029 8.80 1,594 18.42 0.1543
2014-07-23 2014-06-30 13F Costco Wholesale COM 22160K105 11,690 2 0.02 1,346 3.14 0.1320
2014-05-05 2014-03-31 13F Costco Wholesale COM 22160K105 11,688 -182 -1.53 1,305 -7.64 0.1424
2014-02-14 2013-12-31 13F Costco Wholesale COM 22160K105 11,870 -1,269 -9.66 1,413 -6.61 0.1648
2013-10-24 2013-09-30 13F Costco Wholesale COM 22160K105 13,139 326 2.54 1,513 6.77 0.1989
2013-07-22 2013-06-30 13F Costco Wholesale COM 22160K105 12,813 12,813 1,417 0.2013
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.