Costco Wholesale Corporation
MX ˙ BMV ˙ US22160K1051
SecurityMX:COST / Costco Wholesale Corporation
InstitutionMorgan Stanley
Latest Disclosed Ownership9,898,711 shares
Latest Disclosed Value $ 9,863,376,524
Morgan Stanley reports 3.94% increase in ownership of COST / Costco Wholesale Corporation

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 9,898,711 shares of Costco Wholesale Corporation (MX:COST) valued at $9,863,376,524 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 9,523,423 shares of Costco Wholesale Corporation. This represents a change in shares of 3.94% 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.

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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)
2026-05-15 2026-03-31 13F COSTCO WHOLESALE COM 22160K105 9,898,711 375,288 3.94 9,863,377 20.10 0.5943
2026-05-27 2025-12-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 9,523,423 107,775 1.14 8,212,433 -5.77 0.4903
2026-02-13 2025-12-31 13F COSTCO WHSL CORP COM 22160K105 9,523,423 107,775 8,212,433 0.4903
2026-05-27 2025-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 9,415,648 -156,701 -1.64 8,715,410 -8.03 0.5277
2025-11-14 2025-09-30 13F COSTCO WHSL CORP COM 22160K105 9,415,648 -156,701 8,715,410 0.5277
2025-08-15 2025-06-30 13F COSTCO WHSL CORP COM 22160K105 9,572,349 57,475 0.60 9,476,055 5.30 0.6173
2025-05-15 2025-03-31 13F COSTCO WHSL CORP COM 22160K105 9,514,874 -59,774 -0.62 8,998,981 2.58 0.6434
2025-05-15 2024-12-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 9,574,648 126,173 1.34 8,772,967 4.74 0.6147
2025-02-14 2024-12-31 13F COSTCO WHSL CORP COM 22160K105 9,574,648 126,173 8,772,967 0.6146
2025-05-14 2024-09-30 13F/A-2 COSTCO WHSL CORP COM 22160K105 9,448,475 8,379 0.09 8,376,266 4.39 0.6074
2025-02-14 2024-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 9,448,475 8,379 8,376,266 0.6073
2024-11-14 2024-09-30 13F COSTCO WHSL CORP COM 22160K105 9,448,475 8,379 8,376,266 0.6073
2025-05-14 2024-06-30 13F/A-2 COSTCO WHSL CORP COM 22160K105 9,440,096 133,582 1.44 8,023,991 17.68 0.6209
2024-10-17 2024-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 9,440,096 133,582 8,023,991 0.6208
2024-08-14 2024-06-30 13F COSTCO WHSL CORP COM 22160K105 9,440,096 133,582 8,023,991 0.6209
2024-10-17 2024-03-31 13F/A-2 COSTCO WHSL CORP COM 22160K105 9,306,514 503,234 5.72 6,818,235 17.34 0.5470
2024-08-16 2024-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 9,306,514 503,234 6,818,235 0.5471
2024-05-15 2024-03-31 13F COSTCO WHSL CORP COM 22160K105 9,306,514 503,234 6,818,235 0.5471
2024-08-16 2023-12-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 8,803,280 68,297 0.78 5,810,872 17.75 0.5121
2024-02-13 2023-12-31 13F COSTCO WHSL CORP COM 22160K105 8,803,280 68,297 5,810,872 0.5121
2023-11-15 2023-09-30 13F COSTCO WHSL CORP COM 22160K105 8,734,983 -294,178 -3.26 4,934,918 1.52 0.5018
2023-08-14 2023-06-30 13F COSTCO WHSL CORP COM 22160K105 9,029,161 457,429 5.34 4,861,122 14.14 0.4791
2023-05-15 2023-03-31 13F COSTCO WHSL CORP COM 22160K105 8,571,732 -62,895 -0.73 4,259,038 8.05 0.4567
2023-02-14 2022-12-31 13F COSTCO WHSL CORP COM 22160K105 8,634,627 1,315,174 17.97 3,941,708 14.03 0.4477
2022-11-14 2022-09-30 13F COSTCO WHSL CORP COM 22160K105 7,319,453 279,518 3.97 3,456,757 2.45 0.4711
2022-10-27 2022-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 7,039,935 1,893,739 36.80 3,374,098 13.86 0.4380
2022-08-15 2022-06-30 13F COSTCO WHSL CORP COM 22160K105 7,039,935 1,893,739 3,374,098 0.4380
2022-10-27 2022-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 5,146,196 -373,125 -6.76 2,963,439 -5.42 0.3997
2022-05-13 2022-03-31 13F COSTCO WHSL CORP COM 22160K105 5,146,196 -373,125 2,963,439 0.3997
2022-02-14 2021-12-31 13F COSTCO WHSL CORP COM 22160K105 5,519,321 -552,136 -9.09 3,133,321 14.85 0.3869
2021-11-15 2021-09-30 13F COSTCO WHSL CORP COM 22160K105 6,071,457 -113,648 -1.84 2,728,209 11.48 0.3674
2021-08-23 2021-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 6,185,105 91,694 1.50 2,447,261 13.94 0.3228
2021-08-16 2021-06-30 13F COSTCO WHSL CORP COM 22160K105 6,185,105 91,694 2,447,261 0.0671
2021-05-17 2021-03-31 13F COSTCO WHSL CORP COM 22160K105 6,093,411 -991,027 -13.99 2,147,806 -19.54 0.3155
2021-02-16 2020-12-31 13F COSTCO WHSL CORP COM 22160K105 7,084,438 2,034,871 40.30 2,669,275 48.91 0.4123
2020-11-13 2020-09-30 13F COSTCO WHSL CORP COM 22160K105 5,049,567 876,624 21.01 1,792,598 41.68 0.3467
2020-08-14 2020-06-30 13F COSTCO WHSL CORP COM 22160K105 4,172,943 806,462 23.96 1,265,278 31.82 0.2801
2020-05-26 2020-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 3,366,481 115,213 3.54 959,885 0.45 0.2608
2020-05-15 2020-03-31 13F COSTCO WHSL CORP COM 22160K105 3,366,481 115,213 959,885 73,739.1782
2020-02-14 2019-12-31 13F COSTCO WHSL CORP COM 22160K105 3,251,268 164,724 5.34 955,614 7.46 0.2222
2019-11-14 2019-09-30 13F COSTCO WHSL CORP COM 22160K105 3,086,544 -307,952 -9.07 889,265 -0.87 0.2354
2019-08-14 2019-06-30 13F COSTCO WHSL CORP COM 22160K105 3,394,496 274,845 8.81 897,029 18.75 0.2387
2019-05-15 2019-03-31 13F COSTCO WHSL CORP COM 22160K105 3,119,651 -352,982 -10.16 755,392 6.78 0.2138
2019-02-14 2018-12-31 13F COSTCO WHSL CORP COM 22160K105 3,472,633 -621,335 -15.18 707,411 -26.43 0.2117
2019-04-23 2018-09-30 13F/A-2 COSTCO WHSL CORP COM 22160K105 4,093,968 -133,483 -3.16 961,592 8.84 0.2407
2018-11-20 2018-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 4,093,968 0 961,592 0.2407
2018-11-14 2018-09-30 13F COSTCO WHSL CORP COM 22160K105 4,093,968 -133,483 961,592
2019-04-23 2018-06-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 4,227,451 -312,593 -6.89 883,453 3.27 0.2387
2018-08-14 2018-06-30 13F COSTCO WHSL CORP COM 22160K105 4,227,451 -312,593 883,453
2019-04-23 2018-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 4,540,044 -1,086,176 -19.31 855,480 -18.30 0.2374
2018-05-14 2018-03-31 13F COSTCO WHSL CORP COM 22160K105 4,540,044 -1,086,176 855,480
2019-04-23 2017-12-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 5,626,220 292,062 5.48 1,047,154 19.49 0.2866
2018-02-14 2017-12-31 13F COSTCO WHSL CORP COM 22160K105 5,626,220 292,062 1,047,154
2017-11-14 2017-09-30 13F COSTCO WHSL CORP COM 22160K105 5,334,158 91,034 1.74 876,351 4.51 0.2625
2017-08-11 2017-06-30 13F COSTCO WHSL CORP COM 22160K105 5,243,124 738,734 16.40 838,531 11.01 0.2533
2017-05-22 2017-03-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 4,504,390 298,615 7.10 755,341 12.17 0.2322
2017-05-12 2017-03-31 13F COSTCO WHSL CORP COM 22160K105 4,504,390 755,341
2017-02-22 2016-12-31 13F/A-1 COSTCO WHSL CORP COM 22160K105 4,205,775 -516,377 -10.94 673,387 -6.50 0.2204
2017-02-13 2016-12-31 13F COSTCO WHSL CORP COM 22160K105 4,205,775 673,387
2016-11-10 2016-09-30 13F COSTCO WHSL CORP COM 22160K105 4,722,152 693,510 17.21 720,175 13.83 0.2460
2016-08-12 2016-06-30 13F COSTCO WHSL CORP COM 22160K105 4,028,642 875,692 27.77 632,659 27.34 0.2285
2016-05-12 2016-03-31 13F COSTCO WHSL CORP COM 22160K105 3,152,950 -397,612 -11.20 496,842 -13.35 0.1912
2016-02-09 2015-12-31 13F COSTCO WHSL CORP COM 22160K105 3,550,562 62,862 1.80 573,416 13.72 0.2076
2016-02-08 2015-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 3,487,700 -1,242,800 -26.27 504,217 -21.08 0.1863
2015-11-09 2015-09-30 13F COSTCO WHSL CORP COM 22160K105 3,487,700 504,217
2015-08-12 2015-06-30 13F COSTCO WHSL CORP COM 22160K105 4,730,500 440,440 10.27 638,901 -1.70 0.2215
2015-05-14 2015-03-31 13F COSTCO WHSL CORP COM 22160K105 4,290,060 -1,077,206 -20.07 649,924 -14.57 0.2394
2015-02-13 2014-12-31 13F COSTCO WHSL CORP COM 22160K105 5,367,266 1,608,312 42.79 760,809 61.51 0.2782
2014-12-16 2014-09-30 13F/A-1 COSTCO WHSL CORP COM 22160K105 3,758,954 656,041 21.14 471,073 31.83 0.1811
2014-11-14 2014-09-30 13F COSTCO WHSL CORP COM 22160K105 3,758,954 471,073
2014-08-12 2014-06-30 13F COSTCO WHSL CORP COM 22160K105 3,102,913 1,153,926 59.21 357,331 64.17 0.6112
2014-05-13 2014-03-31 13F COSTCO WHSL CORP COM 22160K105 1,948,987 -196,033 -9.14 217,663 -14.74 0.0911
2014-02-13 2013-12-31 13F COSTCO WHSL CORP COM 22160K105 2,145,020 406,027 23.35 255,301 27.47 0.1086
2013-11-13 2013-09-30 13F COSTCO WHSL CORP NEW COM ST COM 22160K105 1,738,993 131,173 8.16 200,280 12.66 0.0947
2013-08-08 2013-06-30 13F COSTCO WHSL CORP NEW COM ST COM 22160K105 1,607,820 1,607,820 177,778 0.0897
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.