Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionFoster Group, Inc.
Latest Disclosed Ownership1,374 shares
Latest Disclosed Value $ 1,369,285
Foster Group, Inc. reports 11.26% increase in ownership of COST / Costco Wholesale Corporation

On April 13, 2026 - Foster Group, Inc. filed a 13F-HR form disclosing ownership of 1,374 shares of Costco Wholesale Corporation (MX:COST) valued at $1,369,285 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 12, 2026 disclosing 1,235 shares of Costco Wholesale Corporation. This represents a change in shares of 11.26% 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)
2026-04-13 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 1,374 139 11.26 1,369 28.54 0.0408
2026-01-12 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 1,235 206 20.02 1,065 11.87 0.0322
2025-10-14 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 1,029 -82 -7.38 952 -13.38 0.0299
2025-07-14 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 1,111 97 9.57 1,099 14.60 0.0376
2025-04-11 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 1,014 160 18.74 959 22.63 0.0359
2025-01-23 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 854 26 3.14 783 6.54 0.0299
2024-10-07 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 828 -209 -20.15 734 -16.69 0.0274
2024-07-30 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 1,037 61 6.25 882 23.22 0.0347
2024-04-09 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 976 -4 -0.41 715 29.29 0.0355
2024-02-01 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 980 0 0.00 554 0.00 0.0339
2023-10-27 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 980 132 15.57 554 21.27 0.0339
2023-07-10 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 848 -8 -0.93 457 7.29 0.0274
2023-04-06 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 856 174 25.51 425 36.66 0.0269
2023-01-24 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 682 -115 -14.43 311 -17.29 0.0233
2022-10-13 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 797 124 18.42 376 16.41 0.0309
2022-07-25 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 673 20 3.06 323 -14.10 0.0230
2022-04-22 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 653 0 0.00 376 1.35 0.0309
2022-02-02 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 653 33 5.32 371 32.97 0.0322
2021-11-15 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 620 17 2.82 279 16.74 0.0273
2021-08-09 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 603 603 239 0.0275
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.