Costco Wholesale Corporation
AT ˙ WBAG ˙ US22160K1051
840,50 € ↑15,20 (1,84%)
2026-06-04
DEL PRIS
SecurityAT:COST / Costco Wholesale Corporation
InstitutionFirst Manhattan Co
Latest Disclosed Ownership20,846 shares
Latest Disclosed Value $ 20,771,580
First Manhattan Co reports 1.73% increase in ownership of COST / Costco Wholesale Corporation

On May 15, 2026 - First Manhattan Co filed a 13F-HR form disclosing ownership of 20,846 shares of Costco Wholesale Corporation (AT:COST) valued at $17,969,252 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 20,491 shares of Costco Wholesale Corporation. This represents a change in shares of 1.73% during the quarter. The current value of the position is $17,521,063 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)
2026-05-15 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 20,846 355 1.73 20,772 17.55 0.0576
2026-02-17 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 20,491 -309 -1.49 17,670 -8.22 0.0464
2025-11-14 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 20,800 1,990 10.58 19,253 3.40 0.0508
2025-08-14 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 18,810 -74 -0.39 18,621 4.26 0.0526
2025-05-15 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 18,884 571 3.12 17,860 6.44 0.0521
2025-02-14 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 18,313 -307 -1.65 16,780 1.65 0.0492
2024-11-14 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 18,620 393 2.16 16,507 6.55 0.0489
2024-08-15 2024-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 18,227 1 0.01 15,493 15.95 0.0497
2024-08-14 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 18,227 1 15,493 0.0497
2024-05-15 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 18,226 1,035 6.02 13,362 17.67 0.0433
2024-02-13 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 17,191 -27 -0.16 11,355 16.74 0.0394
2023-11-14 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 17,218 1,864 12.14 9,727 17.67 0.0359
2023-08-14 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 15,354 -309 -1.97 8,267 6.22 0.0303
2023-05-15 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 15,663 -2,156 -12.10 7,783 -4.33 0.0298
2023-02-14 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 17,819 549 3.18 8,134 -0.27 0.0298
2022-11-14 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 17,270 689 4.16 8,156 2.64 0.0345
2022-08-15 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 16,581 -53 -0.32 7,946 -17.05 0.0320
2022-05-16 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 16,634 -81 -0.48 9,579 0.95 0.0313
2022-02-14 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 16,715 -1,225 -6.83 9,489 17.71 0.0313
2021-11-15 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 17,940 6 0.03 8,061 13.60 0.0297
2021-08-16 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 17,934 116 0.65 7,096 12.99 0.0259
2021-05-14 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 17,818 1,155 6.93 6,280 0.03 0.0271
2021-02-16 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 16,663 -371 -2.18 6,278 3.82 0.0300
2020-11-12 2020-09-30 13F COSTCO WHSL COMMON 22160K105 17,034 360 2.16 6,047 19.60 0.0312
2020-08-14 2020-06-30 13F COSTCO WHSL COMMON 22160K105 16,674 872 5.52 5,056 12.23 0.0292
2020-05-06 2020-03-31 13F COSTCO WHSL COMMON 22160K105 15,802 281 1.81 4,505 -1.25 0.0292
2020-02-13 2019-12-31 13F COSTCO WHSL COMMON 22160K105 15,521 -70 -0.45 4,562 1.56 0.0229
2019-11-13 2019-09-30 13F COSTCO WHSL COMMON 22160K105 15,591 15 0.10 4,492 9.14 0.0247
2019-08-16 2019-06-30 13F COSTCO WHSL COMMON 22160K105 15,576 -826 -5.04 4,116 3.65 0.0229
2019-04-12 2019-03-31 13F COSTCO WHSL COMMON 22160K105 16,402 195 1.20 3,971 20.30 0.0229
2019-01-30 2018-12-31 13F COSTCO WHSL COMMON 22160K105 16,207 -260 -1.58 3,301 -14.66 0.0205
2018-10-15 2018-09-30 13F COSTCO WHSL COMMON 22160K105 16,467 -25 -0.15 3,868 12.25 0.0206
2018-08-01 2018-06-30 13F COSTCO WHSL COMMON 22160K105 16,492 0 0.00 3,446 10.91 0.0199
2018-04-20 2018-03-31 13F COSTCO WHSL COMMON 22160K105 16,492 -1,894 -10.30 3,107 -9.21 0.0177
2018-01-22 2017-12-31 13F COSTCO WHSL COMMON 22160K105 18,386 4,019 27.97 3,422 45.00 0.0188
2017-10-25 2017-09-30 13F COSTCO WHSL COMMON 22160K105 14,367 -6 -0.04 2,360 2.70 0.0135
2017-08-10 2017-06-30 13F/A-2 COSTCO WHSL COMMON 22160K105 14,373 1,021 7.65 2,298 2.64 0.0134
2017-08-01 2017-06-30 13F/A-1 COSTCO WHSL COMMON 22160K105 14,372 -1 2,298 0.0134
2017-07-28 2017-06-30 13F COSTCO WHSL COMMON 22160K105 14,371 1,019 2,298
2017-04-25 2017-03-31 13F/A-1 COSTCO WHSL COMMON 22160K105 13,352 1,038 8.43 2,239 13.60 0.0133
2017-04-24 2017-03-31 13F COSTCO WHSL COMMON 22160K105 14,776 2,253
2017-01-25 2016-12-31 13F COSTCO WHSL COMMON 22160K105 12,314 -2,462 -16.66 1,971 -12.52 0.0120
2016-10-20 2016-09-30 13F COSTCO WHSL COMMON 22160K105 14,776 530 3.72 2,253 0.72 0.0137
2016-07-14 2016-06-30 13F COSTCO WHSL COMMON 22160K105 14,246 -282 -1.94 2,237 -2.27 0.0137
2016-04-22 2016-03-31 13F COSTCO WHSL COMMON 22160K105 14,528 -1,295 -8.18 2,289 -10.41 0.0141
2016-01-20 2015-12-31 13F COSTCO WHSL COMMON 22160K105 15,823 -74 -0.47 2,555 11.18 0.0157
2015-10-26 2015-09-30 13F COSTCO WHSL COMMON 22160K105 15,897 1,619 11.34 2,298 19.19 0.0148
2015-07-17 2015-06-30 13F COSTCO WHSL COMMON 22160K105 14,278 -459 -3.11 1,928 -13.62 0.0114
2015-04-30 2015-03-31 13F COSTCO WHSL COMMON 22160K105 14,737 -25 -0.17 2,232 6.69 0.0129
2015-01-20 2014-12-31 13F COSTCO WHSL COMMON 22160K105 14,762 -25 -0.17 2,092 12.90 0.0118
2014-10-23 2014-09-30 13F COSTCO WHSL COMMON 22160K105 14,787 -141 -0.94 1,853 7.80 0.0108
2014-08-14 2014-06-30 13F/A-1 COSTCO WHSL COMMON 22160K105 14,928 -4,200 -21.96 1,719 -19.52 0.0109
2014-05-16 2014-03-31 13F COSTCO WHSL COMMON 22160K105 19,128 0 0.00 2,136 -6.15 0.0141
2014-02-04 2013-12-31 13F COSTCO WHSL COMMON 22160K105 19,128 97 0.51 2,276 3.88 0.0150
2013-10-29 2013-09-30 13F COSTCO WHSL COMMON 22160K105 19,031 -43 -0.23 2,191 -1.92 0.0153
2013-08-13 2013-06-30 13F COSTCO WHSL COMMON 22160K105 19,074 19,074 2,234 0.0154
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.