Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionWe Are One Seven, LLC
Latest Disclosed Ownership15,348 shares
Latest Disclosed Value $ 15,293,611
We Are One Seven, LLC reports 15.81% decrease in ownership of COST / Costco Wholesale Corporation

On May 14, 2026 - We Are One Seven, LLC filed a 13F-HR form disclosing ownership of 15,348 shares of Costco Wholesale Corporation (MX:COST) valued at $15,293,611 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 18,230 shares of Costco Wholesale Corporation. This represents a change in shares of -15.81% 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)
2026-05-14 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 15,348 -2,882 -15.81 15,294 -2.72 0.3072
2026-02-03 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 18,230 -5,081 -21.80 15,720 -27.14 0.3207
2025-10-24 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 23,311 -820 -3.40 21,578 -9.67 0.4983
2025-07-25 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 24,131 10,163 72.76 23,888 80.83 0.7682
2025-05-08 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 13,968 -3,104 -18.18 13,211 -15.55 0.5125
2025-02-14 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 17,072 3,071 21.93 15,643 26.03 0.5980
2024-10-15 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 14,001 1,608 12.98 12,412 17.83 0.5364
2024-08-07 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 12,393 3,292 36.17 10,534 58.00 0.4995
2024-05-14 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 9,101 648 7.67 6,667 19.50 0.3465
2024-02-14 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 8,453 3,026 55.76 5,580 82.02 0.3200
2023-11-03 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 5,427 284 5.52 3,066 10.69 0.2357
2023-08-11 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 5,143 -3,851 -42.82 2,769 -38.04 0.2535
2023-05-08 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 8,994 4,155 85.86 4,469 102.40 0.2839
2023-01-25 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 4,839 180 3.86 2,209 -17.30 0.2210
2022-11-14 2022-09-30 13F Costco Wholesale COM 22160K105 4,659 -132 -2.76 2,670 16.24 0.1034
2022-08-10 2022-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 4,791 -4,406 -47.91 2,297 -56.63 0.3168
2022-05-13 2022-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 9,197 825 9.85 5,296 11.42 0.5692
2022-02-09 2021-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 8,372 1,581 23.28 4,753 42.39 0.4930
2021-11-09 2021-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 6,791 621 10.06 3,338 36.75 0.4235
2021-07-29 2021-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 6,170 2,862 86.52 2,441 109.35 0.3411
2021-04-29 2021-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 3,308 1,211 57.75 1,166 47.59 0.2002
2021-01-22 2020-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 2,097 74 3.66 790 10.03 0.1628
2020-10-30 2020-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 2,023 29 1.45 718 18.68 0.1706
2020-08-12 2020-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 1,994 56 2.89 605 9.60 0.1572
2020-04-17 2020-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 1,938 -104 -5.09 552 -8.00 0.1875
2020-01-16 2019-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 2,042 102 5.26 600 7.33 0.1568
2019-10-10 2019-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 1,940 84 4.53 559 14.08 0.1607
2019-07-16 2019-06-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 1,856 -27 -1.43 490 7.46 0.1581
2019-04-09 2019-03-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 1,883 774 69.79 456 101.77 0.1486
2019-01-24 2018-12-31 13F COSTCO WHSL CORP NEW COM COM 22160K105 1,109 -109 -8.95 226 -20.98 0.0969
2018-10-09 2018-09-30 13F COSTCO WHSL CORP NEW COM COM 22160K105 1,218 273 28.89 286 60.67 0.1338
2018-05-15 2018-03-31 13F COSTCO WHOLESALE CORPORATION COM Total COM 22160K105 945 15 1.61 178 2.89 0.0820
2018-02-16 2017-12-31 13F COSTCO WHOLESALE CORPORATION COM COM 22160K105 930 930 173 0.0800
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.