Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionRiverview Trust Co
Latest Disclosed Ownership803 shares
Latest Disclosed Value $ 800,133
Riverview Trust Co ownership in COST / Costco Wholesale Corporation

On May 1, 2026 - Riverview Trust Co filed a 13F-HR form disclosing ownership of 803 shares of Costco Wholesale Corporation (MX:COST) valued at $800,133 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 803 shares of Costco Wholesale Corporation. This represents a change in shares of 0.00% 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)
2026-05-01 2026-03-31 13F Costco Wholesale Com 22160K105 803 0 0.00 800 15.61 0.9854
2026-01-26 2025-12-31 13F Costco Wholesale Com 22160K105 803 5 0.63 692 -6.23 0.8337
2025-10-22 2025-09-30 13F Costco Wholesale Com 22160K105 798 0 0.00 739 -6.46 0.8924
2025-07-21 2025-06-30 13F Costco Wholesale Com 22160K105 798 -200 -20.04 790 -16.33 0.9832
2025-04-11 2025-03-31 13F Costco Wholesale Com 22160K105 998 -9 -0.89 944 2.28 0.9316
2025-02-06 2024-12-31 13F Costco Wholesale Com 22160K105 1,007 1 0.10 923 3.48 0.8389
2024-10-18 2024-09-30 13F Costco Wholesale Com 22160K105 1,006 8 0.80 892 5.07 0.7822
2024-07-16 2024-06-30 13F Costco Wholesale Com 22160K105 998 19 1.94 848 18.27 0.8040
2024-04-12 2024-03-31 13F Costco Wholesale Com 22160K105 979 0 0.00 717 10.99 0.5529
2024-01-24 2023-12-31 13F Costco Wholesale Com 22160K105 979 10 1.03 646 18.10 0.6576
2023-10-17 2023-09-30 13F Costco Wholesale Com 22160K105 969 0 0.00 547 4.99 0.4854
2023-07-18 2023-06-30 13F Costco Wholesale Com 22160K105 969 32 3.42 522 12.04 0.4728
2023-04-20 2023-03-31 13F Costco Wholesale Com 22160K105 937 0 0.00 466 0.4279
2023-01-26 2022-12-31 13F Costco Wholesale Com 22160K105 937 -771 -45.14 0 -100.00 0.4049
2022-10-27 2022-09-30 13F Costco Wholesale Com 22160K105 1,708 134 8.51 807 7.03 0.7811
2022-07-27 2022-06-30 13F Costco Wholesale Com 22160K105 1,574 0 0.00 754 -16.78 0.6571
2022-04-21 2022-03-31 13F Costco Wholesale Com 22160K105 1,574 290 22.59 906 24.28 0.6719
2022-01-19 2021-12-31 13F Costco Wholesale Com 22160K105 1,284 0 0.00 729 26.34 0.4276
2021-10-14 2021-09-30 13F Costco Wholesale Com 22160K105 1,284 0 0.00 577 13.58 0.6106
2021-07-16 2021-06-30 13F Costco Wholesale Com 22160K105 1,284 0 0.00 508 12.14 0.5370
2021-04-19 2021-03-31 13F Costco Wholesale Com 22160K105 1,284 0 0.00 453 -6.40 0.5053
2021-01-22 2020-12-31 13F Costco Wholesale Com 22160K105 1,284 -300 -18.94 484 -13.88 0.5351
2020-10-15 2020-09-30 13F Costco Wholesale Com 22160K105 1,584 -935 -37.12 562 -26.44 0.6460
2020-07-08 2020-06-30 13F Costco Wholesale Com 22160K105 2,519 0 0.00 764 6.41 0.7411
2020-04-15 2020-03-31 13F/A-1 Costco Wholesale Com 22160K105 2,519 -321 -11.30 718 -14.01 0.6896
2020-04-15 2020-03-31 13F Costco Wholesale Com 22160K105 2,840 0 835 445,485.3923
2020-01-10 2019-12-31 13F Costco Wholesale Com 22160K105 2,840 0 0.00 835 2.08 0.5618
2019-10-16 2019-09-30 13F Costco Wholesale Com 22160K105 2,840 0 0.00 818 9.07 0.5697
2019-07-12 2019-06-30 13F Costco Wholesale Com 22160K105 2,840 0 0.00 750 9.01 0.5269
2019-04-10 2019-03-31 13F Costco Wholesale Com 22160K105 2,840 0 0.00 688 18.83 0.5201
2019-02-11 2018-12-31 13F Costco Wholesale COM 22160K105 2,840 2,840 579 0.4529
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.