Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionWealthPLAN Partners, LLC
Latest Disclosed Ownership7,976 shares
Latest Disclosed Value $ 7,947,372
WealthPLAN Partners, LLC reports 12.08% decrease in ownership of COST / Costco Wholesale Corporation

On April 29, 2026 - WealthPLAN Partners, LLC filed a 13F-HR form disclosing ownership of 7,976 shares of Costco Wholesale Corporation (MX:COST) valued at $7,947,372 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 9,072 shares of Costco Wholesale Corporation. This represents a change in shares of -12.08% 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)
2026-04-29 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 7,976 -1,096 -12.08 7,947 1.59 1.2955
2026-02-12 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 9,072 -894 -8.97 7,823 -15.20 1.1688
2025-10-27 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 9,966 996 11.10 9,225 3.90 1.3828
2025-07-28 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 8,970 -1,605 -15.18 8,879 -11.22 1.4289
2025-05-12 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 10,575 -227 -2.10 10,001 1.05 1.4098
2025-01-30 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 10,802 -887 -7.59 9,897 -4.49 1.4040
2024-11-05 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 11,689 -3,580 -23.45 10,362 -20.16 1.3913
2024-08-09 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 15,269 558 3.79 12,979 20.42 1.3935
2024-05-07 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 14,711 849 6.12 10,778 17.78 1.1159
2024-01-05 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 13,862 458 3.42 9,150 20.84 0.9406
2023-11-02 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 13,404 4,268 46.72 7,573 53.97 0.8800
2023-07-31 2023-06-30 13F Costco Wholesale Stock/ETF 22160K105 9,136 -4,011 -30.51 4,919 -24.71 0.6957
2023-05-10 2023-03-31 13F Costco Wholesale Stock/ETF 22160K105 13,147 -13,830 -51.27 6,532 -51.88 0.7431
2023-02-16 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 26,977 -1,492 -5.24 13,576 -10.32 0.9485
2022-05-03 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 28,469 -1,492 -4.98 15,137 0.02 1.0501
2022-02-01 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 29,961 583 1.98 15,134 -4.96 0.9971
2021-12-09 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 29,378 -312 -1.05 15,923 20.71 1.0589
2021-08-19 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 29,690 180 0.61 13,191 19.12 0.9282
2021-05-11 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 29,510 1,182 4.17 11,074 9.86 0.8594
2021-02-09 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 28,328 1,040 3.81 10,080 -1.68 0.8568
2020-12-18 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 27,288 2,580 10.44 10,252 23.61 0.9994
2020-08-19 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 24,708 3,635 17.25 8,294 31.32 0.8588
2020-05-15 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 21,073 2,980 16.47 6,316 10.79 0.8197
2020-02-14 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 18,093 414 2.34 5,701 6.46 0.6731
2019-11-15 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 17,679 307 1.77 5,355 11.59 0.7320
2019-08-19 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 17,372 -2,810 -13.92 4,799 -2.81 0.7224
2019-05-16 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 20,182 125 0.62 4,938 13.73 0.7709
2019-02-20 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 20,057 156 0.78 4,342 -0.50 0.6983
2018-11-21 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 19,901 -563 -2.75 4,364 2.03 0.7966
2018-08-16 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 20,464 -5,900 -22.38 4,277 -13.91 0.8767
2018-05-15 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 26,364 1,680 6.81 4,968 8.14 1.0902
2018-02-16 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 24,684 19,102 342.21 4,594 400.98 1.2299
2017-11-14 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 5,582 715 14.69 917 17.87 0.2573
2017-08-11 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 4,867 4,309 772.22 778 736.56 0.2235
2017-04-19 2017-03-31 13F COSTCO WHOLESALE Common Stock 22160K105 558 -5,197 -90.30 93 -89.26 0.3237
2016-12-09 2016-09-30 13F COSTCO WHOLESALE Common Stock/Common Stocks, Annuities, Real Estate, Oil & Gas, Gold Coins, Miscellaneous Description Securities. 22160K105 5,755 -1,332 -18.79 866 -2.81 0.2820
2016-08-08 2016-06-30 13F Costco Wholesale Common Stock 22160K105 7,087 -3,602 -33.70 892 21.72 0.1144
2016-03-24 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 10,689 10,194 2,059.39 733 992.54 0.1191
2015-08-10 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 495 -718 -59.19 67 -63.39 0.0293
2015-05-04 2015-03-31 13F Costco Wholesale Common Stock 22160K105 1,213 1,213 183 0.0852
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.