Costco Wholesale Corporation
US ˙ NasdaqGS ˙ US22160K1051

SecurityCOST / Costco Wholesale Corporation
InstitutionCENTRAL TRUST Co
Latest Disclosed Ownership19,995 shares
Latest Disclosed Value $ 19,923,708
CENTRAL TRUST Co reports 0.01% increase in ownership of COST / Costco Wholesale Corporation

On April 17, 2026 - CENTRAL TRUST Co filed a 13F-HR form disclosing ownership of 19,995 shares of Costco Wholesale Corporation (US:COST) valued at $19,923,618 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 19,994 shares of Costco Wholesale Corporation. This represents a change in shares of 0.01% during the quarter. The current value of the position is $19,231,791 USD.

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 19,995 1 0.01 19,924 15.56 0.3922
2026-02-02 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 19,994 -312 -1.54 17,242 -8.27 0.3378
2025-11-06 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 20,306 -824 -3.90 18,796 -10.14 0.3929
2025-08-07 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 21,130 95 0.45 20,917 5.14 0.4827
2025-04-18 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 21,035 -513 -2.38 19,894 0.76 0.4891
2025-01-24 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 21,548 -1,903 -8.11 19,744 -5.03 0.4838
2024-10-22 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 23,451 -88 -0.37 20,790 3.90 0.4871
2024-08-05 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 23,539 593 2.58 20,008 19.02 0.4900
2024-04-24 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 22,946 -393 -1.68 16,811 9.09 0.4185
2024-01-24 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 23,339 25 0.11 15,410 16.99 0.4095
2023-10-26 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 23,314 127 0.55 13,171 5.51 0.3799
2023-07-26 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 23,187 -470 -1.99 12,483 6.20 0.3483
2023-04-19 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 23,657 -2,739 -10.38 11,755 -2.45 0.3439
2023-01-26 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 26,396 -527 -1.96 12,050 -5.24 0.3714
2022-11-17 2022-09-30 13F/A-2 COSTCO WHSL CORP COM 22160K105 26,923 831 3.18 12,715 1.67 0.4360
2022-11-04 2022-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 26,092 0 12,506 0.2243
2022-11-03 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 26,092 0 12,506 0.2243
2022-08-09 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 26,092 -89 -0.34 12,506 -17.05 0.4124
2022-05-03 2022-03-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 26,181 -554 -2.07 15,076 -0.67 0.4314
2022-02-08 2021-12-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 26,735 -210 -0.78 15,178 25.37 0.4277
2021-10-19 2021-09-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 26,945 -84 -0.31 12,107 13.20 0.4316
2021-07-23 2021-06-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 27,029 -108 -0.40 10,695 11.81 0.3880
2021-04-23 2021-03-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 27,137 18 0.07 9,565 -6.39 0.3742
2021-01-29 2020-12-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 27,119 -928 -3.31 10,218 2.62 0.4178
2020-10-22 2020-09-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 28,047 610 2.22 9,957 19.69 0.4507
2020-07-14 2020-06-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 27,437 1,686 6.55 8,319 13.31 0.4173
2020-04-17 2020-03-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 25,751 289 1.14 7,342 -1.88 0.4498
2020-01-21 2019-12-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 25,462 1,076 4.41 7,483 6.50 0.3828
2019-10-28 2019-09-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 24,386 432 1.80 7,026 6.07 0.3959
2019-07-12 2019-06-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 23,954 2,789 13.18 6,624 29.25 0.3772
2019-04-26 2019-03-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 21,165 -7,208 -25.40 5,125 -11.33 0.3057
2019-01-08 2018-12-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 28,373 1,031 3.77 5,780 -10.00 0.3842
2018-10-04 2018-09-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 27,342 174 0.64 6,422 13.12 0.3733
2018-07-09 2018-06-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 27,168 -181 -0.66 5,677 10.15 0.3621
2018-04-04 2018-03-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 27,349 829 3.13 5,154 4.42 0.3272
2018-01-23 2017-12-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 26,520 265 1.01 4,936 14.42 0.3005
2017-10-17 2017-09-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 26,255 301 1.16 4,314 3.95 0.2789
2017-07-14 2017-06-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 25,954 827 3.29 4,150 -1.50 0.2744
2017-04-06 2017-03-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 25,127 -407 -1.59 4,213 3.06 0.2804
2017-01-24 2016-12-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 25,534 1,267 5.22 4,088 10.46 0.2816
2016-10-24 2016-09-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 24,267 634 2.68 3,701 -0.27 0.2699
2016-08-08 2016-06-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 23,633 -470 -1.95 3,711 -2.29 0.2776
2016-04-11 2016-03-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 24,103 -125 -0.52 3,798 -2.94 0.2998
2016-01-21 2015-12-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 24,228 35 0.14 3,913 11.86 0.3232
2015-10-14 2015-09-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 24,193 -1,734 -6.69 3,498 -0.11 0.3043
2015-07-28 2015-06-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 25,927 673 2.66 3,502 -8.47 0.2753
2015-04-09 2015-03-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 25,254 -385 -1.50 3,826 5.28 0.3079
2015-01-16 2014-12-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 25,639 295 1.16 3,634 14.38 0.2961
2014-10-23 2014-09-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 25,344 3,115 14.01 3,177 28.00 0.2525
2014-05-07 2014-03-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 22,229 1,026 4.84 2,482 -1.66 0.2052
2014-01-27 2013-12-31 13F COSTCO WHOLESALE COMMON STOCK 22160K105 21,203 -382 -1.77 2,524 1.53 0.2116
2013-10-24 2013-09-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 21,585 807 3.88 2,486 8.18 0.2252
2013-08-13 2013-06-30 13F COSTCO WHOLESALE COMMON STOCK 22160K105 20,778 20,778 2,298 0.2181
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.