Costco Wholesale Corporation
US ˙ NasdaqGS ˙ US22160K1051

SecurityCOST / Costco Wholesale Corporation
InstitutionBailard, Inc.
Latest Disclosed Ownership39,522 shares
Latest Disclosed Value $ 39,381,660
Bailard, Inc. reports 0.43% increase in ownership of COST / Costco Wholesale Corporation

On May 11, 2026 - Bailard, Inc. filed a 13F-HR form disclosing ownership of 39,522 shares of Costco Wholesale Corporation (US:COST) valued at $39,380,906 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 4, 2026 disclosing 39,354 shares of Costco Wholesale Corporation. This represents a change in shares of 0.43% during the quarter. The current value of the position is $38,013,445 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 39,522 168 0.43 39,382 16.04 0.9053
2026-02-04 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 39,354 -754 -1.88 33,937 -8.59 0.7514
2025-10-30 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 40,108 -909 -2.22 37,125 -8.57 0.8067
2025-08-08 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 41,017 830 2.07 40,605 6.83 0.9465
2025-05-02 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 40,187 1,281 3.29 38,009 6.62 0.9810
2025-02-05 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 38,906 -160 -0.41 35,649 2.93 0.9112
2024-10-30 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 39,066 -109 -0.28 34,633 4.01 0.9016
2024-07-25 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 39,175 -527 -1.33 33,298 14.48 0.9174
2024-05-08 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 39,702 267 0.68 29,087 11.74 0.8028
2024-02-02 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 39,435 434 1.11 26,030 18.14 0.7711
2023-10-24 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 39,001 -37 -0.09 22,034 4.84 0.7299
2023-07-20 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 39,038 435 1.13 21,017 9.58 0.7350
2023-05-08 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 38,603 647 1.70 19,181 10.69 0.6872
2023-02-02 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 37,956 -544 -1.41 17,327 -4.71 0.6600
2022-10-18 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 38,500 428 1.12 18,183 -0.35 0.7518
2022-07-27 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 38,072 -5,294 -12.21 18,247 -26.93 0.7183
2022-04-25 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 43,366 574 1.34 24,972 2.80 0.8397
2022-02-10 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 42,792 491 1.16 24,293 27.80 0.7745
2021-11-15 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 42,301 -89 -0.21 19,008 13.32 0.6496
2021-08-13 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 42,390 76 0.18 16,773 12.46 0.5795
2021-05-13 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 42,314 116 0.27 14,915 -6.19 0.5529
2021-02-03 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 42,198 -159 -0.38 15,899 5.73 0.7251
2020-11-10 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 42,357 424 1.01 15,037 18.26 0.7788
2020-08-12 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 41,933 776 1.89 12,715 8.35 0.7103
2020-04-16 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 41,157 120 0.29 11,735 -2.71 0.8357
2020-01-31 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 41,037 8,653 26.72 12,062 29.28 0.6798
2019-10-18 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 32,384 9 0.03 9,330 9.06 0.5642
2019-07-26 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 32,375 -1,123 -3.35 8,555 5.47 0.5230
2019-04-24 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 33,498 -614 -1.80 8,111 16.72 0.5031
2019-02-05 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 34,112 209 0.62 6,949 -12.73 0.4698
2018-11-13 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 33,903 195 0.58 7,963 13.05 0.4656
2018-08-08 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 33,708 -828 -2.40 7,044 8.24 0.4196
2018-05-07 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 34,536 634 1.87 6,508 3.14 0.4154
2018-02-08 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 33,902 -941 -2.70 6,310 10.24 0.3971
2018-01-29 2017-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 34,843 1,414 4.23 5,724 7.07 0.4432
2017-10-11 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 34,843 1,414 5,724 0.4365
2018-01-29 2017-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 33,429 844 2.59 5,346 -2.16 0.4362
2017-08-11 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 33,429 844 5,346 0.4237
2018-01-29 2017-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 32,585 -1,374 -4.05 5,464 0.50 0.4536
2017-05-12 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 32,585 -1,374 5,464 0.4567
2018-01-29 2016-12-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 33,959 -867 -2.49 5,437 2.37 0.5041
2017-02-10 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 33,959 -867 5,437 0.4920
2018-01-29 2016-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 34,826 15,221 77.64 5,311 72.49 0.4905
2016-11-08 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 34,826 15,221 5,311 0.4841
2018-01-29 2016-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 19,605 19,605 3,079 0.3669
2016-08-08 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 19,605 19,605 3,079 0.3718
2014-10-21 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 0 -2,402 -100.00 0 -100.00
2014-07-30 2014-06-30 13F COSTCO WHSL CORP COM 22160K105 2,402 -315 -11.59 277 -8.58 0.0426
2014-04-30 2014-03-31 13F COSTCO WHSL CORP COM 22160K105 2,717 -1,120 -29.19 303 -33.70 0.0481
2014-01-28 2013-12-31 13F COSTCO WHSL CORP COM 22160K105 3,837 -1,337 -25.84 457 -23.32 0.0737
2013-10-28 2013-09-30 13F COSTCO WHSL CORP COM 22160K105 5,174 -14,018 -73.04 596 -71.91 0.1132
2013-07-16 2013-06-30 13F COSTCO WHSL CORP COM 22160K105 19,192 19,192 2,122 0.3861
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.