Costco Wholesale Corporation
AT ˙ WBAG ˙ US22160K1051
840,50 € ↑15,20 (1,84%)
2026-06-04
PREZZO DELLE AZIONI
SecurityAT:COST / Costco Wholesale Corporation
InstitutionBarr E S & Co
Latest Disclosed Ownership9,804 shares
Latest Disclosed Value $ 9,769,206
Barr E S & Co reports 2.14% decrease in ownership of COST / Costco Wholesale Corporation

On May 13, 2026 - Barr E S & Co filed a 13F-HR form disclosing ownership of 9,804 shares of Costco Wholesale Corporation (AT:COST) valued at $8,451,048 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 10,018 shares of Costco Wholesale Corporation. This represents a change in shares of -2.14% during the quarter. The current value of the position is $8,240,262 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)
2026-05-13 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 9,804 -214 -2.14 9,769 13.08 0.5683
2026-02-05 2025-12-31 13F COSTCO WHOLESALE COM 22160K105 10,018 72 0.72 8,639 -6.16 0.4497
2025-11-12 2025-09-30 13F COSTCO WHOLESALE COM 22160K105 9,946 0 0.00 9,206 -6.50 0.4991
2025-08-12 2025-06-30 13F COSTCO WHOLESALE COM 22160K105 9,946 1,130 12.82 9,846 18.09 0.5645
2025-05-15 2025-03-31 13F COSTCO WHOLESALE COM 22160K105 8,816 -2 -0.02 8,338 3.21 0.5063
2025-02-13 2024-12-31 13F COSTCO WHOLESALE COM 22160K105 8,818 -56 -0.63 8,080 2.69 0.4779
2024-11-14 2024-09-30 13F COSTCO WHOLESALE COM 22160K105 8,874 87 0.99 7,867 5.34 0.4909
2024-08-14 2024-06-30 13F COSTCO WHOLESALE COM 22160K105 8,787 -200 -2.23 7,469 13.43 0.4901
2024-05-15 2024-03-31 13F COSTCO WHOLESALE COM 22160K105 8,987 0 0.00 6,584 10.99 0.4291
2024-02-09 2023-12-31 13F COSTCO WHOLESALE COM 22160K105 8,987 -75 -0.83 5,932 15.88 0.4027
2023-11-14 2023-09-30 13F COSTCO WHOLESALE COM 22160K105 9,062 -200 -2.16 5,120 2.67 0.3705
2023-08-10 2023-06-30 13F COSTCO WHOLESALE COM 22160K105 9,262 188 2.07 4,987 10.60 0.3762
2023-05-15 2023-03-31 13F COSTCO WHOLESALE COM 22160K105 9,074 -91 -0.99 4,509 7.77 0.3734
2023-02-14 2022-12-31 13F COSTCO WHOLESALE COM 22160K105 9,165 -70 -0.76 4,184 -4.08 0.3473
2022-11-14 2022-09-30 13F COSTCO WHOLESALE COM 22160K105 9,235 -53 -0.57 4,361 -2.04 0.3859
2022-08-15 2022-06-30 13F COSTCO WHOLESALE COM 22160K105 9,288 3 0.03 4,452 -16.74 0.3631
2022-05-16 2022-03-31 13F COSTCO WHOLESALE COM 22160K105 9,285 -16 -0.17 5,347 1.27 0.3659
2022-02-14 2021-12-31 13F COSTCO WHOLESALE COM 22160K105 9,301 0 0.00 5,280 26.35 0.3521
2021-11-10 2021-09-30 13F COSTCO WHOLESALE COM 22160K105 9,301 6 0.06 4,179 13.62 0.3009
2021-08-13 2021-06-30 13F COSTCO WHOLESALE COM 22160K105 9,295 -10 -0.11 3,678 12.13 0.2650
2021-05-14 2021-03-31 13F COSTCO WHOLESALE COM 22160K105 9,305 6,182 197.95 3,280 178.67 0.2572
2021-02-16 2020-12-31 13F COSTCO WHOLESALE COM 22160K105 3,123 222 7.65 1,177 14.27 0.1023
2020-11-13 2020-09-30 13F COSTCO WHOLESALE COM 22160K105 2,901 -100 -3.33 1,030 13.19 0.1017
2020-08-14 2020-06-30 13F COSTCO WHOLESALE COM 22160K105 3,001 -13 -0.43 910 5.94 0.0937
2020-05-15 2020-03-31 13F COSTCO WHOLESALE COM 22160K105 3,014 0 0.00 859 -3.05 0.0990
2020-02-14 2019-12-31 13F COSTCO WHOLESALE COM 22160K105 3,014 0 0.00 886 2.07 0.0853
2019-11-12 2019-09-30 13F COSTCO WHOLESALE COM 22160K105 3,014 -150 -4.74 868 3.83 0.0857
2019-08-08 2019-06-30 13F COSTCO WHOLESALE COM 22160K105 3,164 0 0.00 836 9.14 0.0822
2019-05-15 2019-03-31 13F COSTCO WHOLESALE COM 22160K105 3,164 68 2.20 766 21.39 0.0794
2019-02-14 2018-12-31 13F COSTCO WHOLESALE COM 22160K105 3,096 0 0.00 631 -13.20 0.0704
2018-11-07 2018-09-30 13F COSTCO WHOLESALE COM 22160K105 3,096 0 0.00 727 12.36 0.0715
2018-08-10 2018-06-30 13F COSTCO WHOLESALE COM 22160K105 3,096 0 0.00 647 10.98 0.0668
2018-05-15 2018-03-31 13F COSTCO WHOLESALE COM 22160K105 3,096 0 0.00 583 1.22 0.0612
2018-02-14 2017-12-31 13F COSTCO WHOLESALE COM 22160K105 3,096 0 0.00 576 13.16 0.0585
2017-11-09 2017-09-30 13F COSTCO WHOLESALE COM 22160K105 3,096 81 2.69 509 5.60 0.0542
2017-08-14 2017-06-30 13F COSTCO WHOLESALE COM 22160K105 3,015 0 0.00 482 -4.74 0.0537
2017-05-15 2017-03-31 13F COSTCO WHOLESALE COM 22160K105 3,015 -316 -9.49 506 -5.07 0.0577
2017-02-14 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 3,331 -119 -3.45 533 1.33 0.0626
2016-11-10 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 3,450 0 0.00 526 -2.95 0.0647
2016-08-12 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 3,450 0 0.00 542 -0.37 0.0656
2016-05-13 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 3,450 0 0.00 544 -2.33 0.0657
2016-02-12 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 3,450 0 0.00 557 11.62 0.0680
2015-11-13 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 3,450 0 0.00 499 7.08 0.0637
2015-08-14 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 3,450 0 0.00 466 -10.90 0.0557
2015-05-14 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 3,450 0 0.00 523 6.95 0.0614
2015-02-13 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 3,450 0 0.00 489 13.19 0.0558
2014-11-13 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 3,450 0 0.00 432 8.82 0.0528
2014-08-14 2014-06-30 13F COSTCO WHSL CORP COM 22160K105 3,450 0 0.00 397 3.12 0.0481
2014-05-15 2014-03-31 13F COSTCO WHSL CORP COM 22160K105 3,450 26 0.76 385 -5.64 0.0482
2014-02-14 2013-12-31 13F COSTCO WHSL CORP COM 22160K105 3,424 17 0.50 408 4.08 0.0505
2013-11-14 2013-09-30 13F COSTCO WHSL CORP COM 22160K105 3,407 147 4.51 392 8.89 0.0529
2013-08-14 2013-06-30 13F COSTCO WHSL CORP COM 22160K105 3,260 3,260 360 0.0499
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.