Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionHeadinvest, Llc
Latest Disclosed Ownership709 shares
Latest Disclosed Value $ 706,628
Headinvest, Llc reports 9.41% increase in ownership of COST / Costco Wholesale Corporation

On May 15, 2026 - Headinvest, Llc filed a 13F-HR form disclosing ownership of 709 shares of Costco Wholesale Corporation (MX:COST) valued at $706,628 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 648 shares of Costco Wholesale Corporation. This represents a change in shares of 9.41% 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 709 61 9.41 707 26.52 0.1449
2026-02-02 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 648 24 3.85 559 -3.29 0.1112
2025-11-14 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 624 0 0.00 578 -6.48 0.1194
2025-08-14 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 624 -194 -23.72 618 -20.18 0.1316
2025-05-15 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 818 -392 -32.40 774 -30.23 0.1504
2025-02-18 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 1,210 -18 -1.47 1,109 1.84 0.2093
2024-11-15 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 1,228 -31 -2.46 1,089 1.68 0.2015
2024-08-14 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 1,259 131 11.61 1,070 29.54 0.2107
2024-08-14 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 1,128 -1,049 -48.19 827 -42.52 0.1613
2024-02-12 2023-12-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 2,177 -100 -4.39 1,437 10.54 0.2989
2023-12-11 2023-09-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 2,277 0 0.00 1,301 1.48 0.2826
2023-08-23 2023-06-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 2,277 -48 -2.06 1,282 10.91 0.2763
2023-05-17 2023-03-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 2,325 42 1.84 1,155 10.84 0.2534
2023-02-13 2022-12-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 2,283 -65 -2.77 1,042 -6.04 0.2332
2022-12-28 2022-09-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 2,348 10 0.43 1,109 -1.07 0.2657
2022-08-12 2022-06-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 2,338 0 0.00 1,121 -16.72 0.2495
2022-05-13 2022-03-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 2,338 -7 -0.30 1,346 1.13 0.2572
2022-02-11 2021-12-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 2,345 26 1.12 1,331 27.74 0.2361
2021-11-16 2021-09-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 2,319 -11 -0.47 1,042 13.14 0.1976
2021-08-30 2021-06-30 13F COSTCO WHSL CORP NEW COM Stock 22160K105 2,330 38 1.66 921 14.13 0.1752
2021-05-13 2021-03-31 13F COSTCO WHSL CORP NEW COM Stock 22160K105 2,292 98 4.47 807 -2.42 0.1647
2021-02-16 2020-12-31 13F/A-1 Costco Wholesale COM 22160K105 2,194 702 47.05 827 56.04 0.1755
2021-02-16 2020-12-31 13F Costco Wholesale COM 22160K105 1,492 530 0.1532
2020-11-24 2020-09-30 13F Costco Wholesale COM 22160K105 1,492 1 0.07 530 17.26 0.1532
2020-08-12 2020-06-30 13F Costco Wholesale COM 22160K105 1,491 12 0.81 452 7.11 0.1424
2020-05-12 2020-03-31 13F/A-1 Costco Wholesale COM 22160K105 1,479 -151 -9.26 422 -11.90 0.1580
2020-05-11 2020-03-31 13F Costco COM 22160K105 1,530 -100 370 103,668.1722
2020-02-14 2019-12-31 13F Costco Wholesale COM 22160K105 1,630 0 0.00 479 1.91 0.1375
2019-11-21 2019-09-30 13F Costco Wholesale COM 22160K105 1,630 100 6.54 470 16.34 0.1425
2019-08-22 2019-06-30 13F Costco Wholesale COM 22160K105 1,530 0 0.00 404 9.19 0.1143
2019-05-15 2019-03-31 13F Costco COM 22160K105 1,530 -1,530 -50.00 370 -40.61 0.1037
2019-02-22 2018-12-31 13F Costco COM 22160K105 3,060 1,518 98.44 623 72.10 0.0987
2018-11-14 2018-09-30 13F Costco COM 22160K105 1,542 0 0.00 362 12.42 0.1042
2018-08-09 2018-06-30 13F Costco COM 22160K105 1,542 12 0.78 322 11.81 0.0982
2018-04-09 2018-03-31 13F Costco COM 22160K105 1,530 0 0.00 288 1.05 0.0924
2018-01-30 2017-12-31 13F Costco COM 22160K105 1,530 0 0.00 285 15.85 0.0879
2017-11-13 2017-09-30 13F Costco COM 22160K105 1,530 1,530 246 0.0770
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.