Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionProShare Advisors LLC
Latest Disclosed Ownership627,658 shares
Latest Disclosed Value $ 625,417,261
ProShare Advisors LLC reports 18.45% decrease in ownership of COST / Costco Wholesale Corporation

On April 24, 2026 - ProShare Advisors LLC filed a 13F-HR form disclosing ownership of 627,658 shares of Costco Wholesale Corporation (MX:COST) valued at $625,417,261 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 769,624 shares of Costco Wholesale Corporation. This represents a change in shares of -18.45% during the quarter.

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.

Upgrade to unlock premium data and export to Excel .

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)
2026-04-24 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 627,658 -141,966 -18.45 625,417 -5.76 0.9261
2026-02-06 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 769,624 214,466 38.63 663,678 29.15 1.1713
2025-11-06 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 555,158 -126,123 -18.51 513,871 -23.81 1.0755
2025-08-07 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 681,281 34,093 5.27 674,427 10.18 1.3457
2025-05-08 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 647,188 79,451 13.99 612,097 17.67 1.3817
2025-02-14 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 567,737 94,065 19.86 520,200 23.88 1.1889
2024-11-14 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 473,672 29,890 6.74 419,920 11.32 1.0292
2024-08-13 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 443,782 -46,099 -9.41 377,210 5.10 1.0092
2024-05-08 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 489,881 88,147 21.94 358,902 35.34 0.9542
2024-02-14 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 401,734 -72,871 -15.35 265,177 -1.10 0.8103
2023-11-13 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 474,605 61,767 14.96 268,133 20.64 0.8360
2023-08-10 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 412,838 -22,668 -5.20 222,264 2.71 0.6446
2023-05-26 2023-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 435,506 44,281 11.32 216,390 21.16 0.6613
2023-05-12 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 435,506 44,281 216,390 0.6881
2023-02-02 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 391,225 -45,886 -10.50 178,594 -13.49 0.6271
2022-11-07 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 437,111 -93,317 -17.59 206,435 -18.80 0.7922
2022-08-01 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 530,428 -266,669 -33.46 254,223 -44.61 0.8431
2022-05-10 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 797,097 -22,615 -2.76 459,010 -1.36 0.9860
2022-02-08 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 819,712 294,118 55.96 465,350 97.04 0.9132
2021-11-12 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 525,594 50,477 10.62 236,176 25.63 0.6636
2021-08-13 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 475,117 -32,067 -6.32 187,990 5.16 0.5495
2021-05-14 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 507,184 84,997 20.13 178,772 12.38 0.5621
2021-02-09 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 422,187 64,438 18.01 159,072 25.25 0.5917
2020-11-13 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 357,749 49,623 16.10 127,001 35.94 0.5870
2020-08-03 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 308,126 42,436 15.97 93,427 23.33 0.4990
2020-05-15 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 265,690 -105,027 -28.33 75,756 -30.47 0.5443
2020-02-12 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 370,717 57,123 18.22 108,961 20.60 0.5045
2019-11-12 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 313,594 17,040 5.75 90,350 15.29 0.5058
2019-08-13 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 296,554 -26,258 -8.13 78,367 0.26 0.4686
2019-05-15 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 322,812 -1,477 -0.46 78,166 18.32 0.4677
2019-02-14 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 324,289 80,221 32.87 66,061 15.24 0.4624
2018-11-14 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 244,068 -30,220 -11.02 57,327 0.01 0.3892
2018-08-13 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 274,288 -29,960 -9.85 57,321 -0.01 0.3842
2018-05-14 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 304,248 54,201 21.68 57,329 23.18 0.3735
2018-02-14 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 250,047 68,642 37.84 46,539 56.16 0.3228
2017-11-13 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 181,405 20,227 12.55 29,803 15.62 0.2739
2017-08-11 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 161,178 22,731 16.42 25,777 11.03 0.2568
2017-05-12 2017-03-31 13F/A-2 COSTCO WHSL CORP COM 22160K105 138,447 -4,207 -2.95 23,216 1.65 0.2428
2017-05-08 2017-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 138,447 0 23,216 0.2428
2017-04-25 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 138,447 23,216
2017-02-13 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 142,654 35,813 33.52 22,840 40.17 0.2529
2016-11-10 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 106,841 -60,847 -36.29 16,294 -38.13 0.2275
2016-08-12 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 167,688 -9,202 -5.20 26,334 -5.52 0.3392
2016-05-06 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 176,890 -34,351 -16.26 27,874 -18.29 0.3837
2016-02-05 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 211,241 5,892 2.87 34,115 14.92 0.4132
2015-11-06 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 205,349 30,907 17.72 29,687 26.01 0.4170
2015-08-11 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 174,442 -49,994 -22.28 23,560 -30.71 0.3260
2015-05-08 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 224,436 224,436 0.00 34,001 0.4005
2015-01-30 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 0 -182,615 -100.00 0 -100.00
2014-11-06 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 182,615 21,214 13.14 22,885 23.12 0.3034
2014-08-08 2014-06-30 13F COSTCO WHSL CORP COM 22160K105 161,401 -21,096 -11.56 18,587 -8.80 0.2408
2014-05-07 2014-03-31 13F COSTCO WHSL CORP COM 22160K105 182,497 18,580 11.34 20,381 4.48 0.2549
2014-02-04 2013-12-31 13F COSTCO WHSL CORP COM 22160K105 163,917 73,074 80.44 19,508 86.54 0.2907
2013-11-07 2013-09-30 13F COSTCO WHSL CORP COM 22160K105 90,843 -46,590 -33.90 10,458 -31.18 0.2482
2013-07-25 2013-06-30 13F COSTCO WHSL CORP COM 22160K105 137,433 137,433 15,196 0.2983
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.