Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionAegon Asset Management Uk Plc
Latest Disclosed Ownership31,711 shares
Latest Disclosed Value $ 31,591,767
Aegon Asset Management Uk Plc reports 13.39% decrease in ownership of COST / Costco Wholesale Corporation

On April 16, 2026 - Aegon Asset Management Uk Plc filed a 13F-HR form disclosing ownership of 31,711 shares of Costco Wholesale Corporation (MX:COST) valued at $31,591,767 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 36,614 shares of Costco Wholesale Corporation. This represents a change in shares of -13.39% 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)
2026-04-16 2026-03-31 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 31,711 -4,903 -13.39 31,592 0.08 0.4185
2026-01-29 2025-12-31 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 36,614 -1,098 -2.91 31,567 -9.56 0.3757
2025-10-31 2025-09-30 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 37,712 -18,771 -33.23 34,903 -37.53 0.4139
2026-04-10 2025-06-30 13F/A COSTCO WHOLESALE COMMON STOCK USD 22160K105 56,483 -18,452 -24.62 55,876 -21.14 0.7151
2025-07-28 2025-06-30 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 56,483 -18,452 56 0.7151
2026-04-10 2025-03-31 13F/A COSTCO WHOLESALE COMMON STOCK USD 22160K105 74,935 -7,088 -8.64 70,853 -5.73 1.0332
2025-04-10 2025-03-31 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 74,935 -7,088 71 1.0332
2026-04-10 2024-12-31 13F/A COSTCO WHOLESALE COMMON STOCK USD 22160K105 82,023 -25,193 -23.50 75,158 -20.89 0.9905
2025-01-21 2024-12-31 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 82,023 -25,193 75 0.9905
2026-04-10 2024-09-30 13F/A COSTCO WHOLESALE COMMON STOCK USD 22160K105 107,216 6,559 6.52 95,001 11.04 1.2948
2024-11-01 2024-09-30 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 107,216 6,559 95 1.2948
2026-04-10 2024-06-30 13F/A COSTCO WHOLESALE COMMON STOCK USD 22160K105 100,657 -29,609 -22.73 85,556 -10.29 1.2033
2024-07-30 2024-06-30 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 100,657 -29,609 86 1.2033
2026-04-10 2024-03-31 13F/A COSTCO WHOLESALE COMMON STOCK USD 22160K105 130,266 2,519 1.97 95,373 13.08 1.4303
2024-04-18 2024-03-31 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 130,266 2,519 95 1.4303
2026-04-10 2023-12-31 13F/A COSTCO WHOLESALE COMMON STOCK USD 22160K105 127,747 43,402 51.46 84,340 85.73 1.3433
2024-01-11 2023-12-31 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 127,747 43,402 84 1.3433
2026-04-10 2023-06-30 13F/A COSTCO WHOLESALE COMMON STOCK USD 22160K105 84,345 0 0.00 45,410 8.35 0.7345
2023-07-28 2023-06-30 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 84,345 0 45 0.7345
2025-09-02 2023-03-31 13F/A COSTCO WHOLESALE COMMON STOCK USD 22160K105 84,345 75,729 878.93 41,910 1,396,900.00 0.7299
2023-04-14 2023-03-31 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 84,345 75,729 42 0.7315
2023-10-19 2022-12-31 13F/A COSTCO WHOLESALE COMMON STOCK USD 22160K105 8,616 1,846 27.27 4 0.00 0.0709
2023-01-17 2022-12-31 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 8,616 1,846 4 0.0710
2022-10-18 2022-09-30 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 6,770 -419 -5.83 3 0.00 0.0646
2022-07-12 2022-06-30 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 7,189 591 8.96 3 0.00 0.0649
2022-04-28 2022-03-31 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 6,598 -1,621 -19.72 4 -25.00 0.0561
2022-01-24 2021-12-31 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 8,219 -752 -8.38 5 0.00 0.0601
2021-10-28 2021-09-30 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 8,971 0 0.00 4 33.33 0.0573
2021-07-28 2021-06-30 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 8,971 0 0.00 4 0.00 0.0504
2021-05-07 2021-03-31 13F/A COSTCO WHOLESALE COMMON STOCK USD 22160K105 8,971 -376 -4.02 3 0.00 0.0470
2021-05-07 2021-03-31 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 9,347 0 4 0.0515
2021-01-25 2020-12-31 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 9,347 0 0.00 4 -99.91 0.0515
2020-10-30 2020-09-30 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 9,347 -599 -6.02 3,317 10.05 0.0671
2020-08-06 2020-06-30 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 9,946 4,196 72.97 3,014 83.89 0.0676
2020-04-30 2020-03-31 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 5,750 1,970 52.12 1,639 47.52 0.0471
2020-01-21 2019-12-31 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 3,780 0 0.00 1,111 2.02 0.0266
2019-10-21 2019-09-30 13F COSTCO WHOLESALE COMMON STOCK USD 22160K105 3,780 3,780 1,089 0.0287
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.