Costco Wholesale Corporation
IT ˙ BIT ˙ US22160K1051
836,20 € ↑12,80 (1,55%)
2026-06-04
AKTIENPREIS
SecurityIT:1COST / Costco Wholesale Corporation
InstitutionEastern Bank
Latest Disclosed Ownership25,904 shares
Latest Disclosed Value $ 25,811,523
Eastern Bank reports 21.09% increase in ownership of 1COST / Costco Wholesale Corporation

On April 7, 2026 - Eastern Bank filed a 13F-HR form disclosing ownership of 25,904 shares of Costco Wholesale Corporation (IT:1COST) valued at $23,285,106 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 14, 2026 disclosing 21,392 shares of Costco Wholesale Corporation. This represents a change in shares of 21.09% during the quarter. The current value of the position is $21,660,925 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)
2026-04-07 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 25,904 4,512 21.09 25,812 39.92 0.4042
2026-01-14 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 21,392 694 3.35 18,447 -3.71 0.3183
2025-10-27 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 20,698 -1,218 -5.56 19,159 -11.69 0.3404
2025-07-24 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 21,916 -285 -1.28 21,696 3.32 0.4130
2025-05-08 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 22,201 -370 -1.64 20,997 1.53 0.4112
2025-01-13 2024-12-31 13F Costco Wholesale COM 22160K105 22,571 197 0.88 20,681 4.27 0.3843
2024-10-21 2024-09-30 13F Costco Wholesale COM 22160K105 22,374 15,837 242.27 19,835 256.98 0.3553
2024-07-23 2024-06-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 6,537 -130 -1.95 5,556 13.76 0.2244
2024-05-09 2024-03-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 6,667 0 0.00 4,884 11.00 0.2033
2024-01-25 2023-12-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 6,667 -48 -0.71 4,401 16.00 0.1998
2023-10-17 2023-09-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 6,715 0 0.00 3,794 4.92 0.1885
2023-07-19 2023-06-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 6,715 -55 -0.81 3,615 7.49 0.1719
2023-04-19 2023-03-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 6,770 -110 -1.60 3,364 7.10 0.1690
2023-01-24 2022-12-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 6,880 -122 -1.74 3,141 -5.05 0.1676
2022-10-19 2022-09-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 7,002 160 2.34 3,307 0.85 0.1888
2022-07-20 2022-06-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 6,842 78 1.15 3,279 -15.82 0.1744
2022-04-21 2022-03-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 6,764 -99 -1.44 3,895 -0.03 0.1806
2022-01-26 2021-12-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 6,863 57 0.84 3,896 27.36 0.1699
2021-10-19 2021-09-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 6,806 -70 -1.02 3,059 12.42 0.1477
2021-07-20 2021-06-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 6,876 -45 -0.65 2,721 11.56 0.1334
2021-04-27 2021-03-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 6,921 -263 -3.66 2,439 -9.87 0.1318
2021-01-20 2020-12-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 7,184 -262 -3.52 2,706 2.38 0.1515
2020-10-30 2020-09-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 7,446 -545 -6.82 2,643 9.08 0.1618
2020-09-01 2020-06-30 13F/A-1 COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 7,991 -845 -9.56 2,423 -3.81 0.1576
2020-07-21 2020-06-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 7,991 -845 2,423 157,604.9768
2020-04-27 2020-03-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 8,836 -40,997 -82.27 2,519 -82.80 0.1875
2020-02-04 2019-12-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 49,833 -5,301 -9.61 14,647 -7.79 0.8507
2019-11-04 2019-09-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 55,134 662 1.22 15,885 10.36 0.9907
2019-07-24 2019-06-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 54,472 268 0.49 14,394 9.67 0.9156
2019-04-18 2019-03-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 54,204 -16,755 -23.61 13,125 -9.21 0.8798
2019-01-18 2018-12-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 70,959 162 0.23 14,456 -13.06 1.0797
2018-10-16 2018-09-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 70,797 -909 -1.27 16,628 10.96 1.0848
2018-07-18 2018-06-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 71,706 -317 -0.44 14,985 10.42 1.0238
2018-04-09 2018-03-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 72,023 -11,461 -13.73 13,571 -12.66 0.9491
2018-01-22 2017-12-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 83,484 419 0.50 15,538 13.86 1.0414
2017-10-24 2017-09-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 83,065 -220 -0.26 13,647 2.45 0.9664
2017-07-26 2017-06-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 83,285 19,870 31.33 13,321 25.27 0.9804
2017-04-17 2017-03-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 63,415 -16,103 -20.25 10,634 -16.48 0.8025
2017-01-18 2016-12-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 79,518 -739 -0.92 12,732 4.02 0.9907
2016-10-17 2016-09-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 80,257 -19,856 -19.83 12,240 -22.14 0.9838
2016-07-15 2016-06-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 100,113 -330 -0.33 15,721 -0.68 1.2699
2016-04-14 2016-03-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 100,443 1,811 1.84 15,828 -0.64 1.2908
2016-01-20 2015-12-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 98,632 632 0.64 15,930 12.44 1.3261
2015-10-16 2015-09-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 98,000 -304 -0.31 14,168 6.71 1.2352
2015-07-16 2015-06-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 98,304 2,153 2.24 13,277 -8.86 1.0723
2015-04-17 2015-03-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 96,151 -6,071 -5.94 14,567 0.53 1.1667
2015-01-12 2014-12-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 102,222 436 0.43 14,490 13.59 1.1500
2014-10-15 2014-09-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 101,786 1,195 1.19 12,756 10.12 1.0309
2014-07-16 2014-06-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 100,591 408 0.41 11,584 3.53 0.9381
2014-04-17 2014-03-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 100,183 -6,710 -6.28 11,189 -12.05 0.9427
2014-01-21 2013-12-31 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 106,893 4,279 4.17 12,722 7.65 1.0840
2013-10-18 2013-09-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 102,614 1,440 1.42 11,818 5.64 1.0839
2013-08-09 2013-06-30 13F COSTCO WHOLESALE CORP COMMON STOCKS 22160K105 101,174 101,174 11,187 1.0406
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.