Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionHarfst & Associates, Inc.
Latest Disclosed Ownership3,968 shares
Latest Disclosed Value $ 3,953,386
Harfst & Associates, Inc. reports 2.75% decrease in ownership of COST / Costco Wholesale Corporation

On May 12, 2026 - Harfst & Associates, Inc. filed a 13F-HR form disclosing ownership of 3,968 shares of Costco Wholesale Corporation (MX:COST) valued at $3,953,386 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 4,080 shares of Costco Wholesale Corporation. This represents a change in shares of -2.75% 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.

Upgrade to unlock premium data and export to Excel .

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 3,968 -112 -2.75 3,953 12.36 0.7057
2026-02-10 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 4,080 -43 -1.04 3,519 -7.81 0.6345
2025-10-23 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 4,123 435 11.80 3,817 4.52 0.7039
2025-08-13 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 3,688 -796 -17.75 3,651 -13.91 0.7529
2025-05-13 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 4,484 -104 -2.27 4,241 0.88 0.9802
2025-02-05 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 4,588 -129 -2.73 4,204 0.55 0.8758
2024-10-18 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 4,717 -216 -4.38 4,182 -0.29 0.9393
2024-08-01 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 4,933 -151 -2.97 4,193 12.59 0.9774
2024-08-01 2024-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 5,084 -687 -11.90 3,725 -2.23 0.8844
2024-02-07 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 5,771 -158 -2.66 3,809 13.74 1.0056
2023-11-07 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 5,929 -166 -2.72 3,350 2.07 0.9401
2023-08-07 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 6,095 -309 -4.83 3,281 3.14 0.8734
2023-05-10 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 6,404 760 13.47 3,182 23.49 0.9126
2023-02-13 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 5,644 11 0.20 2,576 -3.16 0.7431
2022-10-28 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 5,633 944 20.13 2,660 18.38 0.8000
2022-07-28 2022-06-30 13F COSTCO WHOLESALE COM 22160K105 4,689 133 2.92 2,247 -14.33 0.6380
2022-04-28 2022-03-31 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 4,556 141 3.19 2,623 4.67 0.6093
2022-02-07 2021-12-31 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 4,415 138 3.23 2,506 30.45 0.6378
2021-10-28 2021-09-30 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 4,277 -44 -1.02 1,921 12.40 0.5309
2021-08-11 2021-06-30 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 4,321 -145 -3.25 1,709 8.58 0.4951
2021-05-10 2021-03-31 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 4,466 516 13.06 1,574 5.78 0.4742
2021-01-25 2020-12-31 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 3,950 533 15.60 1,488 22.67 0.5469
2020-11-04 2020-09-30 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 3,417 -173 -4.82 1,213 11.49 0.5134
2020-08-07 2020-06-30 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 3,590 -84 -2.29 1,088 3.92 0.4676
2020-05-05 2020-03-31 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 3,674 204 5.88 1,047 2.75 0.5323
2020-02-14 2019-12-31 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 3,470 49 1.43 1,019 3.45 0.3923
2019-11-14 2019-09-30 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 3,421 72 2.15 985 11.30 0.4055
2019-08-14 2019-06-30 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 3,349 -88 -2.56 885 6.37 0.3615
2019-05-01 2019-03-31 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 3,437 429 14.26 832 35.95 0.3560
2019-02-06 2018-12-31 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 3,008 183 6.48 612 -7.69 0.2927
2018-10-31 2018-09-30 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 2,825 87 3.18 663 15.91 0.2833
2018-08-10 2018-06-30 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 2,738 -121 -4.23 572 6.32 0.2417
2018-05-04 2018-03-31 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 2,859 294 11.46 538 12.79 0.2195
2018-02-09 2017-12-31 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 2,565 8 0.31 477 13.57 0.1931
2017-11-07 2017-09-30 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 2,557 0 0.00 420 2.94 0.1749
2017-08-11 2017-06-30 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 2,557 1,287 101.34 408 92.45 0.1647
2017-05-12 2017-03-31 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 1,270 -644 -33.65 212 -30.72 0.0916
2017-02-02 2016-12-31 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 1,914 -1,096 -36.41 306 -33.33 0.1529
2016-11-14 2016-09-30 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 3,010 -11,916 -79.83 459 -80.41 0.2419
2016-08-05 2016-06-30 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 14,926 12,174 442.37 2,343 441.11 0.9453
2016-05-03 2016-03-31 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 2,752 -12,002 -81.35 433 -81.82 0.2813
2016-02-05 2015-12-31 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 14,754 136 0.93 2,382 12.73 0.9698
2015-11-09 2015-09-30 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 14,618 12,188 501.56 2,113 544.21 0.9263
2015-08-06 2015-06-30 13F COSTCO WHOLESALE CORPORATIONNEW COM 22160K105 2,430 2,430 328 0.1842
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.