COSTCO WHOLESALE CORP (COST) Top Institutional Shareholders
COSTCO WHOLESALE CORP (COST) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $286.30B in COST holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of COST tracked by InsiderSet, reporting ownership valued at approximately $34.82B in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $32.02B, representing an estimated loss of -8.05% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 48% of the total disclosed COST value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Capital Management Llc, State Street Corp, and several other long-term asset managers with concentrated positions in COSTCO WHOLESALE CORP (COST).
This page ranks the largest institutional COST shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
4,127
Total Reported Value
$286.30B
Largest Holder
Blackrock, Inc.
Largest Position
$34.82B
Insider Transactions (90d)
1
Latest Filing Quarter
Q2 2026
New Institutional Positions
12
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.61% | 34,947,040 | $34,822,278,793 | $32,020,225,400 | -$2,802,053,393 | -8.05% | |
| Vanguard Capital Management Llc | 0.72% | 28,847,448 | $28,744,462,611 | $26,431,474,230 | -$2,312,988,381 | -8.05% | |
| State Street Corp | 0.62% | 18,152,232 | $18,087,428,532 | $16,631,982,570 | -$1,455,445,962 | -8.05% | |
| Vanguard Portfolio Management Llc | 0.57% | 10,705,635 | $10,667,415,882 | $9,809,038,069 | -$858,377,813 | -8.05% | |
| Geode Capital Management, Llc | 0.66% | 10,659,224 | $10,576,203,553 | $9,766,513,990 | -$809,689,563 | -7.66% | |
| Morgan Stanley | 0.59% | 9,898,711 | $9,863,376,524 | $9,069,693,954 | -$793,682,570 | -8.05% | |
| Bank Of America Corp | 0.55% | 7,515,031 | $7,488,202,704 | $6,885,647,154 | -$602,555,550 | -8.05% | |
| Fmr Llc | 0.35% | 6,718,589 | $6,694,603,186 | $6,155,907,171 | -$538,696,015 | -8.05% | |
| Northern Trust Corp | 0.65% | 4,928,107 | $4,910,513,658 | $4,515,378,039 | -$395,135,619 | -8.05% | |
| Invesco Ltd. | 0.66% | 4,313,506 | $4,298,106,556 | $3,952,249,873 | -$345,856,684 | -8.05% | |
| Royal Bank Of Canada | 0.71% | 3,758,850 | $3,745,432,000 | $3,444,046,313 | -$301,385,688 | -8.05% | |
| Charles Schwab Investment Management Inc | 0.52% | 3,400,303 | $3,388,163,918 | $3,115,527,624 | -$272,636,294 | -8.05% | |
| Bank Of New York Mellon Corp | 0.62% | 3,391,624 | $3,379,515,547 | $3,107,575,490 | -$271,940,057 | -8.05% | |
| Fisher Asset Management, Llc | 1.09% | 3,219,856 | $3,208,361,404 | $2,950,193,060 | -$258,168,344 | -8.05% | |
| Goldman Sachs Group Inc | 0.42% | 3,213,809 | $3,202,336,161 | $2,944,652,496 | -$257,683,665 | -8.05% | |
| Wells Fargo & Company/Mn | 0.62% | 3,111,874 | $3,100,764,866 | $2,851,254,553 | -$249,510,314 | -8.05% | |
| Nuveen, Llc | 0.83% | 3,074,057 | $3,063,082,636 | $2,816,604,726 | -$246,477,910 | -8.05% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.60% | 2,907,419 | $2,897,039,517 | $2,663,922,659 | -$233,116,858 | -8.05% | |
| Amundi | 0.77% | 2,839,016 | $2,828,880,714 | $2,601,248,410 | -$227,632,304 | -8.05% | |
| Capital International Investors | 0.64% | 2,749,541 | $2,739,726,091 | $2,519,266,941 | -$220,459,150 | -8.05% | |
| Vanguard Fiduciary Trust Co | 0.65% | 2,561,190 | $2,552,046,552 | $2,346,690,338 | -$205,356,215 | -8.05% | |
| Legal & General Group Plc | 0.58% | 2,504,233 | $2,495,292,888 | $2,294,503,486 | -$200,789,402 | -8.05% | |
| Ubs Group Ag | 0.44% | 2,480,387 | $2,471,531,858 | $2,272,654,589 | -$198,877,269 | -8.05% | |
| Alliancebernstein L.P. | 0.77% | 2,766,241 | $2,385,440,264 | $2,534,568,316 | +$149,128,052 | +6.25% | |
| Jennison Associates Llc | 1.58% | 2,312,440 | $2,304,185,082 | $2,118,773,150 | -$185,411,932 | -8.05% | |
| Capital World Investors | 0.28% | 2,034,165 | $2,026,904,532 | $1,863,803,681 | -$163,100,851 | -8.05% | |
| American Century Companies Inc | 0.93% | 1,806,389 | $1,799,940,216 | $1,655,103,921 | -$144,836,295 | -8.05% | |
| Dimensional Fund Advisors Lp | 0.35% | 1,684,707 | $1,678,691,619 | $1,543,612,789 | -$135,078,830 | -8.05% | |
| Ameriprise Financial Inc | 0.33% | 1,446,010 | $1,443,371,214 | $1,324,906,663 | -$118,464,552 | -8.21% | |
| Franklin Resources Inc | 0.35% | 1,438,786 | $1,433,649,952 | $1,318,287,673 | -$115,362,280 | -8.05% | |
| Raymond James Financial Inc | 0.43% | 1,403,778 | $1,398,769,265 | $1,286,211,593 | -$112,557,673 | -8.05% | |
| Bank Of Montreal | 0.56% | 1,369,928 | $1,365,037,605 | $1,255,196,530 | -$109,841,075 | -8.05% | |
| Deutsche Bank Ag\ | 0.45% | 1,353,438 | $1,348,606,227 | $1,240,087,568 | -$108,518,660 | -8.05% | |
| Swiss National Bank | 0.75% | 1,302,660 | $1,298,009,504 | $1,193,562,225 | -$104,447,279 | -8.05% | |
| Principal Financial Group Inc | 0.61% | 1,140,620 | $1,136,549,667 | $1,045,093,075 | -$91,456,592 | -8.05% | |
| Lpl Financial Llc | 0.29% | 1,113,122 | $1,109,147,967 | $1,019,898,033 | -$89,249,935 | -8.05% | |
| Hsbc Holdings Plc | 0.65% | 1,086,751 | $1,082,662,646 | $995,735,604 | -$86,927,042 | -8.03% | |
| Mitsubishi Ufj Asset Management Co., Ltd. | 0.72% | 1,077,949 | $1,074,101,285 | $987,670,771 | -$86,430,514 | -8.05% | |
| Barclays Plc | 0.38% | 1,067,012 | $1,063,202,766 | $977,649,745 | -$85,553,021 | -8.05% | |
| Sumitomo Mitsui Trust Group, Inc. | 0.68% | 1,049,993 | $1,046,244,525 | $962,056,086 | -$84,188,439 | -8.05% | |
| Aqr Capital Management Llc | 0.47% | 1,027,658 | $1,023,988,242 | $941,591,643 | -$82,396,600 | -8.05% | |
| Vanguard Global Advisers, Llc | 0.52% | 971,143 | $967,676,019 | $889,809,774 | -$77,866,245 | -8.05% | |
| California Public Employees Retirement System | 0.58% | 941,708 | $938,346,102 | $862,839,955 | -$75,506,147 | -8.05% | |
| Td Asset Management Inc | 0.76% | 937,230 | $933,884,089 | $858,736,988 | -$75,147,102 | -8.05% | |
| National Pension Service | 0.71% | 933,576 | $930,243,134 | $855,389,010 | -$74,854,124 | -8.05% | |
| Neuberger Berman Group Llc | 0.68% | 892,222 | $889,271,972 | $817,498,408 | -$71,773,565 | -8.07% | |
| D. E. Shaw & Co., Inc. | 0.69% | 885,158 | $881,997,986 | $811,026,018 | -$70,971,969 | -8.05% | |
| Canada Pension Plan Investment Board | 0.56% | 876,126 | $872,998,230 | $802,750,448 | -$70,247,783 | -8.05% | |
| Two Sigma Investments, Lp | 0.72% | 874,793 | $871,669,989 | $801,529,086 | -$70,140,903 | -8.05% | |
| Rhumbline Advisers | 0.70% | 816,202 | $813,288,024 | $747,845,083 | -$65,442,942 | -8.05% |
Frequently asked questions about COST
Who owns the most COST stock?
The largest holders of COST are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for COSTCO WHOLESALE CORP (COST).
Is COST widely held by superinvestors?
Many widely followed stocks like COST appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly COST is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.