Costco Wholesale Corporation
IT ˙ BIT ˙ US22160K1051
836,20 € ↑12,80 (1,55%)
2026-06-04
CENA AKCJI
SecurityIT:1COST / Costco Wholesale Corporation
InstitutionAsset Management One Co., Ltd.
Latest Disclosed Ownership226,244 shares
Latest Disclosed Value $ 225,436,309
Asset Management One Co., Ltd. reports 0.63% decrease in ownership of 1COST / Costco Wholesale Corporation

On May 8, 2026 - Asset Management One Co., Ltd. filed a 13F-HR form disclosing ownership of 226,244 shares of Costco Wholesale Corporation (IT:1COST) valued at $203,370,732 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 227,688 shares of Costco Wholesale Corporation. This represents a change in shares of -0.63% during the quarter. The current value of the position is $189,185,233 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 226,244 -1,444 -0.63 225,436 14.11 0.6648
2026-01-27 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 227,688 3,617 1.61 197,557 -4.75 0.5493
2025-10-22 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 224,071 2,701 1.22 207,407 -5.36 0.6009
2025-07-31 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 221,370 -1,068 -0.48 219,143 4.17 0.6871
2025-04-23 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 222,438 12,012 5.71 210,377 6.40 0.7276
2025-01-30 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 210,426 -5,392 -2.50 197,714 3.34 0.6793
2024-10-30 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 215,818 3,242 1.53 191,327 5.89 0.6809
2024-07-18 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 212,576 -92 -0.04 180,687 15.97 0.6912
2024-05-02 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 212,668 -2,728 -1.27 155,807 9.09 0.6005
2024-01-24 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 215,396 2,320 1.09 142,825 18.65 0.5749
2023-10-19 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 213,076 -5,845 -2.67 120,379 2.14 0.5359
2023-07-31 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 218,921 -3,049 -1.37 117,863 6.87 0.4989
2023-04-25 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 221,970 2,976 1.36 110,290 10.32 0.4999
2023-02-06 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 218,994 -13,754 -5.91 99,977 -9.04 0.4872
2022-11-04 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 232,748 10,320 4.64 109,919 3.11 0.5593
2022-07-29 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 222,428 -16,219 -6.80 106,605 -22.43 0.5006
2022-05-13 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 238,647 -19,469 -7.54 137,425 -6.22 0.5365
2022-02-09 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 258,116 -641 -0.25 146,546 26.04 0.5105
2021-11-02 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 258,757 -11,290 -4.18 116,274 8.82 0.4458
2021-08-03 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 270,047 -1,841 -0.68 106,851 11.50 0.3976
2021-05-14 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 271,888 -9,522 -3.38 95,833 -8.67 0.3806
2021-02-12 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 281,410 -7,549 -2.61 104,926 2.29 0.4321
2020-11-13 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 288,959 -1,953 -0.67 102,581 16.30 0.4715
2020-08-14 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 290,912 46,091 18.83 88,207 26.36 0.4338
2020-05-14 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 244,821 -8,811 -3.47 69,806 -6.36 0.4076
2020-02-14 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 253,632 -16,420 -6.08 74,548 -4.18 0.3360
2019-11-14 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 270,052 11,378 4.40 77,802 13.82 0.3748
2019-08-14 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 258,674 18,864 7.87 68,357 17.72 0.3358
2019-05-15 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 239,810 -500,705 -67.62 58,066 -61.47 0.3140
2019-02-13 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 740,515 3,914 0.53 150,713 -12.87 0.3592
2018-11-14 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 736,601 12,303 1.70 172,973 14.29 0.3550
2018-08-14 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 724,298 995 0.14 151,352 11.05 0.3308
2018-05-14 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 723,303 14,894 2.10 136,292 3.36 0.3069
2018-02-14 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 708,409 -8,587 -1.20 131,866 11.96 0.2909
2017-11-14 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 716,996 457 0.06 117,780 2.82 0.2765
2017-08-14 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 716,539 21,108 3.04 114,549 -1.78 0.2924
2017-05-11 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 695,431 -60,382 -7.99 116,624 -3.67 0.3062
2017-05-02 2016-12-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 755,813 710,736 1,576.72 121,069 1,708.35 0.3094
2017-02-13 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 769,613 123,279
2016-11-07 2016-09-30 13F COSTCO WHOLESALE Com 22160K105 45,077 -3,075 -6.39 6,695 -11.48 0.0995
2016-08-03 2016-06-30 13F COSTCO WHOLESALE Com 22160K105 48,152 5,152 11.98 7,563 11.60 0.1135
2016-05-05 2016-03-31 13F COSTCO WHOLESALE Com 22160K105 43,000 748 1.77 6,777 -1.27 0.0989
2016-01-28 2015-12-31 13F COSTCO WHOLESALE Com 22160K105 42,252 -894 -2.07 6,864 10.60 0.1025
2015-11-12 2015-09-30 13F COSTCO WHOLESALE Com 22160K105 43,146 -24 -0.06 6,206 6.03 0.0944
2015-08-06 2015-06-30 13F COSTCO WHOLESALE Com 22160K105 43,170 -15,853 -26.86 5,853 -34.87 0.0811
2015-05-11 2015-03-31 13F COSTCO WHOLESALE COM 22160K105 59,023 11,564 24.37 8,986 32.34 0.1109
2015-02-09 2014-12-31 13F COSTCO WHOLESALE COM 22160K105 47,459 -1,621 -3.30 6,790 10.41 0.0881
2014-11-05 2014-09-30 13F COSTCO WHOLESALE COM 22160K105 49,080 -8,115 -14.19 6,150 -6.82 0.0849
2014-08-12 2014-06-30 13F COSTCO WHOLESALE Com 22160K105 57,195 -3,040 -5.05 6,600 -1.87 0.0985
2014-05-05 2014-03-31 13F COSTCO WHOLESALE Com 22160K105 60,235 3,314 5.82 6,726 -0.39 0.1060
2014-02-05 2013-12-31 13F/A-1 COSTCO WHOLESALE COM 22160K105 56,921 -21,521 -27.44 6,752 -25.58 0.1046
2014-01-29 2013-12-31 13F COSTCO WHOLESALE COM 22160K105 56,921 6,752
2014-02-05 2013-09-30 13F/A-1 COSTCO WHOLESALE Com 22160K105 78,442 19,895 33.98 9,073 39.03 0.1365
2013-11-06 2013-09-30 13F COSTCO WHOLESALE Com 22160K105 78,442 9,073
2014-02-12 2013-06-30 13F/A-1 COSTCO WHOLESALE COM 22160K105 58,547 58,547 6,526 0.1060
2013-08-05 2013-06-30 13F COSTCO WHOLESALE Com 22160K105 58,547 6,526
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.