Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionCharter Trust Co
Latest Disclosed Ownership34,403 shares
Latest Disclosed Value $ 34,280,181
Charter Trust Co reports 0.08% decrease in ownership of COST / Costco Wholesale Corporation

On April 17, 2026 - Charter Trust Co filed a 13F-HR form disclosing ownership of 34,403 shares of Costco Wholesale Corporation (MX:COST) valued at $34,280,181 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 22, 2026 disclosing 34,430 shares of Costco Wholesale Corporation. This represents a change in shares of -0.08% 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.

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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)
2026-04-17 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 34,403 -27 -0.08 34,280 15.46 2.0056
2026-01-22 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 34,430 -252 -0.73 29,690 -7.51 1.7159
2025-10-15 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 34,682 -287 -0.82 32,103 -7.27 1.9269
2025-07-23 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 34,969 -485 -1.37 34,617 3.24 2.2151
2025-04-16 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 35,454 -738 -2.04 33,532 1.12 2.2212
2025-01-13 2024-12-31 13F Costco Wholesale COM 22160K105 36,192 -176 -0.48 33,162 2.86 2.1720
2024-10-16 2024-09-30 13F Costco Wholesale COM 22160K105 36,368 -713 -1.92 32,241 2.29 2.0561
2024-07-17 2024-06-30 13F Costco Wholesale COM 22160K105 37,081 -669 -1.77 31,518 13.96 2.0861
2024-04-24 2024-03-31 13F Costco Wholesale COM 22160K105 37,750 57 0.15 27,657 11.16 1.8470
2024-01-17 2023-12-31 13F Costco Wholesale COM 22160K105 37,693 -258 -0.68 24,880 16.04 1.8547
2023-11-28 2023-09-30 13F Costco Wholesale COM 22160K105 37,951 -290 -0.76 21,441 4.14 1.7074
2023-08-09 2023-06-30 13F Costco Wholesale COM 22160K105 38,241 -358 -0.93 20,588 7.35 1.5786
2023-04-24 2023-03-31 13F Costco Wholesale COM 22160K105 38,599 -161 -0.42 19,179 8.39 1.5269
2023-06-09 2022-12-31 13F/A-1 Costco Wholesale COM 22160K105 38,760 -321 -0.82 17,694 -4.13 1.4130
2023-01-19 2022-12-31 13F Costco Wholesale COM 22160K105 38,760 -321 18 0.0014
2022-10-24 2022-09-30 13F Costco Wholesale COM 22160K105 39,081 -218 -0.55 18,456 -2.01 1.5903
2022-08-12 2022-06-30 13F Costco Wholesale COM 22160K105 39,299 1,662 4.42 18,835 -13.10 1.5072
2022-04-14 2022-03-31 13F Costco Wholesale COM 22160K105 37,637 -2,239 -5.61 21,674 -4.26 1.9438
2022-01-28 2021-12-31 13F Costco Wholesale COM 22160K105 39,876 -537 -1.33 22,638 24.66 1.9219
2021-11-15 2021-09-30 13F Costco Wholesale COM 22160K105 40,413 -246 -0.61 18,160 12.88 1.6985
2021-08-11 2021-06-30 13F Costco Wholesale COM 22160K105 40,659 -804 -1.94 16,088 10.09 1.4954
2021-05-06 2021-03-31 13F Costco Wholesale COM 22160K105 41,463 -888 -2.10 14,614 -8.42 1.4218
2021-02-09 2020-12-31 13F Costco Wholesale COM 22160K105 42,351 302 0.72 15,957 6.90 1.5988
2020-11-02 2020-09-30 13F Costco Wholesale COM 22160K105 42,049 -1,646 -3.77 14,927 12.67 1.6496
2020-08-04 2020-06-30 13F Costco Wholesale COM 22160K105 43,695 2,790 6.82 13,249 13.59 1.5316
2020-05-14 2020-03-31 13F Costco Wholesale COM 22160K105 40,905 8,685 26.96 11,664 23.17 1.5729
2020-02-11 2019-12-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 32,220 1,452 4.72 9,470 6.82 1.0362
2019-11-07 2019-09-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 30,768 664 2.21 8,865 11.44 1.0297
2019-08-01 2019-06-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 30,104 247 0.83 7,955 10.03 0.9252
2019-05-10 2019-03-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 29,857 392 1.33 7,230 20.46 0.8668
2019-02-13 2018-12-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 29,465 3,880 15.17 6,002 -0.12 0.7982
2018-11-14 2018-09-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 25,585 1,310 5.40 6,009 18.45 0.6819
2018-08-10 2018-06-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 24,275 547 2.31 5,073 13.46 0.6116
2018-04-06 2018-03-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 23,728 13,905 141.56 4,471 144.45 0.5478
2018-01-17 2017-12-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 9,823 123 1.27 1,829 14.81 0.2129
2017-10-11 2017-09-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 9,700 -338 -3.37 1,593 -0.75 0.1927
2017-07-10 2017-06-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 10,038 330 3.40 1,605 -1.41 0.1926
2017-04-07 2017-03-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 9,708 1,813 22.96 1,628 28.80 0.1902
2017-01-19 2016-12-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 7,895 450 6.04 1,264 11.27 0.1395
2016-10-14 2016-09-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 7,445 264 3.68 1,136 0.71 0.1286
2016-07-19 2016-06-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 7,181 391 5.76 1,128 5.42 0.1312
2016-04-08 2016-03-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 6,790 1,462 27.44 1,070 24.42 0.1305
2016-01-11 2015-12-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 5,328 632 13.46 860 26.66 0.1081
2015-10-16 2015-09-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 4,696 3,188 211.41 679 232.84 0.0901
2015-07-20 2015-06-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 1,508 170 12.71 204 0.49 0.0248
2015-04-07 2015-03-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 1,338 1,338 203 0.0246
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.