Costco Wholesale Corporation
US ˙ NasdaqGS ˙ US22160K1051

SecurityCOST / Costco Wholesale Corporation
InstitutionSei Investments Co
Latest Disclosed Ownership171,664 shares
Latest Disclosed Value $ 148,022,521
Sei Investments Co reports 14.95% increase in ownership of COST / Costco Wholesale Corporation

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 171,664 shares of Costco Wholesale Corporation (US:COST) valued at $148,032,734 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 149,335 shares of Costco Wholesale Corporation. This represents a change in shares of 14.95% during the quarter. The current value of the position is $165,111,585 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)
2026-02-13 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 171,664 22,329 14.95 148,023 7.08 0.1461
2025-11-13 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 149,335 -14,047 -8.60 138,237 -14.53 0.1487
2025-08-14 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 163,382 -1,456 -0.88 161,741 3.74 0.1875
2025-05-14 2025-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 164,838 8,388 5.36 155,904 8.76 0.2007
2025-05-13 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 159,311 2,861 147,177 0.1601
2025-02-11 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 156,450 -2,914 -1.83 143,353 1.47 0.1841
2024-11-12 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 159,364 -51,461 -24.41 141,282 -21.16 0.1835
2024-08-13 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 210,825 -3,677 -1.71 179,199 14.03 0.2539
2024-05-07 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 214,502 -14,998 -6.54 157,157 3.74 0.2303
2024-02-14 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 229,500 -19,991 -8.01 151,486 7.48 0.2432
2023-11-14 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 249,491 -65,030 -20.68 140,941 -16.77 0.2533
2023-08-11 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 314,521 635 0.20 169,337 8.58 0.2954
2023-05-12 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 313,886 33,685 12.02 155,958 21.93 0.2897
2023-02-10 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 280,201 -1,257 -0.45 127,913 -3.77 0.2843
2022-11-14 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 281,458 11,611 4.30 132,920 3.29 0.2965
2022-08-15 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 269,847 60,599 28.96 128,681 6.76 0.2779
2022-05-13 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 209,248 59,042 39.31 120,528 41.21 0.2423
2022-02-14 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 150,206 -181 -0.12 85,354 26.49 0.1601
2021-11-12 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 150,387 4,622 3.17 67,477 16.82 0.1416
2021-08-06 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 145,765 -29,231 -16.70 57,760 -7.64 0.1281
2021-05-12 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 174,996 3,247 1.89 62,540 -3.70 0.1576
2021-02-08 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 171,749 -97,019 -36.10 64,943 -31.82 0.1679
2020-12-04 2020-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 268,768 26,333 10.86 95,259 29.27 0.2758
2020-11-06 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 279,991 37,556 99,243 238,955.0784
2020-08-17 2020-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 242,435 55,065 29.39 73,688 37.90 0.2287
2020-08-11 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 228,787 41,417 67,746 183,764.6311
2020-05-14 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 187,370 -47,627 -20.27 53,436 -22.60 0.1963
2020-02-06 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 234,997 5,240 2.28 69,036 -54.74 0.2059
2019-11-12 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 229,757 46,444 25.34 152,529 215.18 0.3902
2019-08-14 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 183,313 -21,362 -10.44 48,395 -2.29 0.1581
2019-05-15 2019-03-31 13F COSTCO W3L CORP COM 22160K105 204,675 -2,097 -1.01 49,528 6.05 0.1663
2019-02-13 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 206,772 24,943 13.72 46,703 9.29 0.1663
2018-11-08 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 181,829 -107,554 -37.17 42,735 -29.33 0.1549
2018-08-03 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 289,383 9,713 3.47 60,475 14.76 0.2055
2018-05-11 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 279,670 -5,332 -1.87 52,698 -0.65 0.2020
2018-02-08 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 285,002 22,012 8.37 53,045 22.77 0.1842
2017-11-06 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 262,990 -1,019 -0.39 43,206 2.32 0.1536
2017-07-31 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 264,009 -45,800 -14.78 42,226 -18.72 0.1683
2017-05-05 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 309,809 375 0.12 51,952 4.87 0.2277
2017-02-02 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 309,434 21,937 7.63 49,541 12.98 0.2399
2016-11-04 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 287,497 -31,010 -9.74 43,848 -12.34 0.2227
2016-08-11 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 318,507 4,338 1.38 50,018 1.03 0.3000
2016-05-10 2016-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 314,169 -799 -0.25 49,507 -2.67 0.3081
2016-02-03 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 314,968 92,774 41.75 50,867 58.35 0.3100
2015-11-02 2015-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 222,194 9,352 4.39 32,123 11.74 0.2949
2015-10-30 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 222,194 32,124
2015-08-07 2015-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 212,842 -11,747 -5.23 28,747 -15.53 0.2599
2015-08-04 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 212,842 -11,747 28,747 0.2599
2015-05-14 2015-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 224,589 -76,187 -25.33 34,032 -20.18 0.2955
2015-05-01 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 224,589 34,032
2015-02-10 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 300,776 300,776 42,637 0.3769
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.