Costco Wholesale Corporation
IT ˙ BIT ˙ US22160K1051
836,20 € ↑12,80 (1,55%)
2026-06-04
AKTIENPREIS
SecurityIT:1COST / Costco Wholesale Corporation
InstitutionWestpac Banking Corp
Latest Disclosed Ownership985 shares
Latest Disclosed Value $ 981,484
Westpac Banking Corp ownership in 1COST / Costco Wholesale Corporation

On May 11, 2026 - Westpac Banking Corp filed a 13F-HR form disclosing ownership of 985 shares of Costco Wholesale Corporation (IT:1COST) valued at $885,416 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 0 shares of Costco Wholesale Corporation. The current value of the position is $823,657 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)
2026-05-11 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 985 985 981 0.0342
2026-02-10 2025-12-31 13F COSTCO WHOLESALE CORP USD 0.005 COM 22160K105 0 -201 -100.00 0 -100.00
2025-11-14 2025-09-30 13F/A-1 COSTCO WHOLESALE CORP USD 0.005 COM 22160K105 201 0 0.00 186 -6.06 0.0115
2025-11-12 2025-09-30 13F COSTCO WHOLESALE CORP USD 0.005 COM 22160K105 201 0 186 0.0047
2025-08-11 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 201 201 199 0.0133
2025-02-12 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -166 -100.00 0 -100.00
2024-11-08 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 166 0 0.00 147 4.26 0.0099
2024-08-14 2024-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 166 -10 -5.68 141 10.16 0.0112
2024-08-13 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 166 -10 141 0.0049
2024-05-09 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 176 176 129 0.0098
2024-02-08 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -3,500 -100.00 0 -100.00
2023-11-13 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 3,500 814 30.31 1,977 36.72 0.1480
2023-08-10 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 2,686 -60,681 -95.76 1,446 -95.41 0.1020
2023-05-04 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 63,367 -18 -0.03 31,485 8.81 0.4233
2023-02-06 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 63,385 -1,700 -2.61 28,935 -5.86 0.4277
2022-11-08 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 65,085 826 1.29 30,738 -0.20 0.4686
2022-08-10 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 64,259 -52 -0.08 30,798 -16.84 0.4012
2022-05-11 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 64,311 -4,021 -5.88 37,033 -4.53 0.4249
2022-02-08 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 68,332 -5,395 -7.32 38,792 17.09 0.4019
2021-10-27 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 73,727 16,559 28.97 33,129 46.47 0.3541
2021-08-11 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 57,168 -6,548 -10.28 22,620 0.72 0.2271
2021-05-13 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 63,716 0 0.00 22,459 -6.45 0.2478
2021-02-11 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 63,716 0 0.00 24,007 6.13 0.2725
2020-11-10 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 63,716 3,480 5.78 22,619 23.84 0.3065
2020-08-12 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 60,236 -4,807 -7.39 18,264 -1.52 0.2722
2020-05-14 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 65,043 -3,468 -5.06 18,546 -7.90 0.3196
2020-02-11 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 68,511 -9,060 -11.68 20,137 -9.90 0.2592
2019-11-13 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 77,571 1,757 2.32 22,349 11.55 0.3107
2019-08-01 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 75,814 -1,992 -2.56 20,035 6.34 0.3059
2019-05-14 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 77,806 -6,506 -7.72 18,840 9.69 0.3110
2019-02-07 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 84,312 16,985 25.23 17,175 8.61 0.2927
2018-11-13 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 67,327 38,935 137.13 15,814 166.53 0.2711
2018-07-18 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 28,392 0 0.00 5,933 10.92 0.1140
2018-05-01 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 28,392 0 0.00 5,350 1.23 0.1068
2018-01-18 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 28,392 -35,500 -55.56 5,284 -49.66 0.1201
2017-10-30 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 63,892 309 0.49 10,497 3.23 0.2311
2017-08-09 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 63,583 -8,529 -11.83 10,169 -15.91 0.2239
2017-05-18 2017-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 72,112 1,119 1.58 12,092 2.53 0.0969
2017-05-11 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 59,257 9,382
2017-02-09 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 70,993 -2,489 -3.39 11,794 5.25 0.1112
2016-11-10 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 73,482 2,693 3.80 11,207 2.10 0.1211
2016-08-10 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 70,789 12,282 20.99 10,975 19.05 0.1202
2016-05-13 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 58,507 28,111 92.48 9,220 87.84 0.1002
2016-02-11 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 30,396 9,245 43.71 4,909 60.55 0.0543
2015-11-16 2015-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 21,151 18,363 658.64 3,058 713.03 0.0337
2015-11-12 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 21,151 3,058
2015-08-12 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 2,788 -22,983 -89.18 377 -91.42 0.0037
2015-05-12 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 25,771 -2,129 -7.63 4,382 10.80 0.0381
2015-02-11 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 27,900 -1,498 -5.10 3,955 7.33 0.0376
2014-11-12 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 29,398 -625 -2.08 3,684 6.57 0.0359
2014-08-11 2014-06-30 13F COSTCO WHSL CORP COM 22160K105 30,023 504 1.71 3,457 4.88 0.0333
2014-05-12 2014-03-31 13F COSTCO WHSL CORP COM 22160K105 29,519 4,041 15.86 3,297 8.71 0.0351
2014-02-13 2013-12-31 13F COSTCO WHSL CORP COM 22160K105 25,478 -140 -0.55 3,032 2.81 0.0347
2013-11-12 2013-09-30 13F COSTCO WHSL CORP COM 22160K105 25,618 -5,926 -18.79 2,949 -14.12 0.0369
2013-08-14 2013-06-30 13F COSTCO WHSL CORP COM 22160K105 31,544 31,544 3,435 0.0525
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.