Costco Wholesale Corporation
US ˙ NasdaqGS ˙ US22160K1051

SecurityCOST / Costco Wholesale Corporation
InstitutionGlenview Trust Co
Latest Disclosed Ownership13,450 shares
Latest Disclosed Value $ 13,401,983
Glenview Trust Co reports 1.43% increase in ownership of COST / Costco Wholesale Corporation

On May 8, 2026 - Glenview Trust Co filed a 13F-HR form disclosing ownership of 13,450 shares of Costco Wholesale Corporation (US:COST) valued at $13,401,984 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 13,260 shares of Costco Wholesale Corporation. This represents a change in shares of 1.43% during the quarter. The current value of the position is $12,936,614 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)
2026-05-08 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 13,450 190 1.43 13,402 17.20 0.1092
2026-02-09 2025-12-31 13F COSTCO WHOLESALE COM 22160K105 13,260 835 6.72 11,435 -0.57 0.1764
2025-11-07 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 12,425 1,298 11.67 11,501 4.40 0.1824
2025-08-14 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 11,127 1,484 15.39 11,015 20.78 0.1906
2025-05-20 2025-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 9,643 147 1.55 9,120 4.83 0.1772
2025-05-15 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 9,496 0 8,701 0.0848
2025-02-10 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 9,496 744 8.50 8,701 12.14 0.1630
2024-11-12 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 8,752 469 5.66 7,759 10.20 0.1492
2024-08-14 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 8,283 281 3.51 7,040 20.10 0.1417
2024-05-14 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 8,002 232 2.99 5,863 14.31 0.1259
2024-02-12 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 7,770 751 10.70 5,129 29.33 0.1260
2023-11-13 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 7,019 502 7.70 3,965 13.03 0.1094
2023-08-14 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 6,517 104 1.62 3,509 10.11 0.0958
2023-05-09 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 6,413 -408 -5.98 3,186 2.35 0.0954
2023-02-08 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 6,821 261 3.98 3,114 0.48 0.1032
2022-11-04 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 6,560 197 3.10 3,098 1.57 0.1174
2022-08-10 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 6,363 526 9.01 3,050 -9.28 0.1120
2022-05-11 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 5,837 321 5.82 3,362 7.34 0.1092
2022-02-10 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 5,516 125 2.32 3,132 29.31 0.1036
2021-11-12 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 5,391 -73 -1.34 2,422 12.03 0.0936
2021-08-11 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 5,464 8 0.15 2,162 12.43 0.0835
2021-05-12 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 5,456 -100 -1.80 1,923 -8.12 0.0828
2021-02-02 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 5,556 0 0.00 2,093 6.14 0.0973
2020-11-12 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 5,556 0 0.00 1,972 17.03 0.1022
2020-08-12 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 5,556 -11 -0.20 1,685 6.18 0.0960
2020-04-28 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 5,567 -101 -1.78 1,587 -4.74 0.1101
2020-02-06 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 5,668 47 0.84 1,666 2.84 0.0932
2019-11-14 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 5,621 -1,067 -15.95 1,620 -8.32 0.0980
2019-08-08 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 6,688 -85 -1.25 1,767 7.74 0.1098
2019-05-14 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 6,773 -60 -0.88 1,640 17.82 0.1052
2019-02-14 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 6,833 100 1.49 1,392 -11.95 0.1029
2018-11-14 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 6,733 -350 -4.94 1,581 6.82 0.0997
2018-08-10 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 7,083 -171 -2.36 1,480 8.27 0.1100
2018-05-15 2018-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 7,254 71 0.99 1,367 2.24 0.0944
2018-05-14 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 7,254 1,367
2018-02-06 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 7,183 0 0.00 1,337 13.31 0.0922
2017-11-07 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 7,183 861 13.62 1,180 16.72 0.0864
2017-08-11 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 6,322 -420 -6.23 1,011 -10.61 0.0785
2017-05-10 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 6,742 -216 -3.10 1,131 1.53 0.0894
2017-02-14 2016-12-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 6,958 1,108 18.94 1,114 17.88 0.0923
2017-02-10 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 6,958 1,114
2017-04-28 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 5,850 -83 -1.40 945 12.37 0.0982
2017-05-01 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 5,933 -1,658 -21.84 841 -6.97 0.0896
2017-05-02 2013-12-31 13F COSTCO WHSL CORP COM 22160K105 7,591 698 10.13 904 32.75 0.1040
2017-05-03 2012-12-31 13F COSTCO WHSL CORP COM 22160K105 6,893 1,151 20.05 681 42.47 0.1008
2017-05-04 2011-12-31 13F COSTCO WHSL CORP COM 22160K105 5,742 817 16.59 478 34.27 0.0807
2017-05-05 2010-12-31 13F COSTCO WHSL CORP COM 22160K105 4,925 952 23.96 356 51.49 0.0615
2017-05-08 2009-12-31 13F COSTCO WHSL CORP COM 22160K105 3,973 -247 -5.85 235 5.86 0.0451
2017-05-09 2008-12-31 13F COSTCO WHSL CORP COM 22160K105 4,220 4,220 222 0.0536
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.