MRK Institutional Ownership & Shareholders
MERCK & CO. INC. (MRK) is currently held by 3,870 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $248.31B based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of MRK tracked by InsiderSet, reporting ownership valued at approximately $29.17B in its June 30, 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 $33.94B, representing an estimated gain of +16.36% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 47% of the total disclosed MRK 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 MERCK & CO. INC. (MRK).
This page ranks the largest institutional MRK 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
3,870
Total Reported Value
$248.31B
Largest Holder
Blackrock, Inc.
Largest Position
$29.17B
Insider Transactions (90d)
19
Latest Filing Quarter
Q2 2026
New Institutional Positions
83
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.43% | 226,999,837 | $29,169,479,139 | $33,941,015,628 | +$4,771,536,489 | +16.36% | |
| Vanguard Capital Management Llc | 0.44% | 161,323,174 | $20,730,027,859 | $24,121,040,976 | +$3,391,013,117 | +16.36% | |
| State Street Corp | 0.46% | 120,413,256 | $15,573,753,504 | $18,004,190,037 | +$2,430,436,533 | +15.61% | |
| Wellington Management Group Llp | 1.91% | 86,249,283 | $11,083,032,867 | $12,895,992,794 | +$1,812,959,927 | +16.36% | |
| Vanguard Portfolio Management Llc | 0.39% | 67,738,969 | $8,704,457,517 | $10,128,330,645 | +$1,423,873,128 | +16.36% | |
| Geode Capital Management, Llc | 0.42% | 60,744,214 | $7,794,706,241 | $9,082,474,877 | +$1,287,768,636 | +16.52% | |
| Charles Schwab Investment Management Inc | 0.93% | 54,365,289 | $6,985,940,692 | $8,128,698,011 | +$1,142,757,319 | +16.36% | |
| Morgan Stanley | 0.33% | 48,641,158 | $6,250,389,318 | $7,272,825,944 | +$1,022,436,626 | +16.36% | |
| Fmr Llc | 0.25% | 45,440,355 | $5,839,085,718 | $6,794,241,880 | +$955,156,162 | +16.36% | |
| Jpmorgan Chase & Co | 0.33% | 43,886,420 | $5,678,025,348 | $6,561,897,518 | +$883,872,170 | +15.57% | |
| Fisher Asset Management, Llc | 1.47% | 38,516,263 | $4,949,339,962 | $5,758,951,644 | +$809,611,682 | +16.36% | |
| Norges Bank | 0.47% | 36,983,784 | $4,752,416,244 | $5,529,815,384 | +$777,399,140 | +16.36% | |
| Bank Of America Corp | 0.25% | 30,535,208 | $3,923,774,320 | $4,565,624,300 | +$641,849,980 | +16.36% | |
| Northern Trust Corp | 0.39% | 26,275,718 | $3,376,429,765 | $3,928,745,355 | +$552,315,590 | +16.36% | |
| Goldman Sachs Group Inc | 0.30% | 22,075,139 | $2,836,655,396 | $3,300,674,783 | +$464,019,387 | +16.36% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.51% | 20,414,819 | $2,455,698,578 | $3,052,423,737 | +$596,725,159 | +24.30% | |
| Legal & General Group Plc | 0.51% | 18,873,343 | $2,425,224,589 | $2,821,942,245 | +$396,717,656 | +16.36% | |
| Invesco Ltd. | 0.19% | 18,611,171 | $2,391,535,516 | $2,782,742,288 | +$391,206,772 | +16.36% | |
| Price T Rowe Associates Inc | 0.24% | 18,518,796 | $2,379,667,000 | $2,768,930,378 | +$389,263,378 | +16.36% | |
| Bank Of New York Mellon Corp | 0.39% | 18,340,173 | $2,356,712,169 | $2,742,222,667 | +$385,510,498 | +16.36% | |
| Dimensional Fund Advisors Lp | 0.41% | 17,486,486 | $2,246,948,350 | $2,614,579,387 | +$367,631,037 | +16.36% | |
| Ameriprise Financial Inc | 0.45% | 17,387,435 | $2,235,322,286 | $2,599,769,281 | +$364,446,995 | +16.30% | |
| Capital International Investors | 0.41% | 15,386,689 | $1,977,446,105 | $2,300,617,739 | +$323,171,634 | +16.34% | |
| Royal Bank Of Canada | 0.31% | 14,293,086 | $1,836,658,000 | $2,137,102,219 | +$300,444,219 | +16.36% | |
| Vanguard Fiduciary Trust Co | 0.39% | 13,869,309 | $1,782,206,207 | $2,073,739,082 | +$291,532,875 | +16.36% | |
| State Farm Mutual Automobile Insurance Co | 1.21% | 13,794,969 | $1,772,653,517 | $2,062,623,765 | +$289,970,248 | +16.36% | |
| Ubs Group Ag | 0.28% | 13,744,783 | $1,766,204,631 | $2,055,119,954 | +$288,915,323 | +16.36% | |
| Alliancebernstein L.P. | 0.52% | 13,131,942 | $1,579,641,303 | $1,963,487,968 | +$383,846,665 | +24.30% | |
| Harris Associates L P | 2.06% | 12,073,109 | $1,551,394,499 | $1,805,171,258 | +$253,776,759 | +16.36% | |
| Deutsche Bank Ag\ | 0.45% | 11,964,180 | $1,537,397,135 | $1,788,884,194 | +$251,487,059 | +16.36% | |
| Wells Fargo & Company/Mn | 0.26% | 11,658,434 | $1,498,108,701 | $1,743,169,052 | +$245,060,351 | +16.36% | |
| Nuveen, Llc | 0.30% | 9,662,399 | $1,241,618,141 | $1,444,721,898 | +$203,103,757 | +16.36% | |
| Stifel Financial Corp | 0.87% | 8,169,394 | $1,049,785,950 | $1,221,487,791 | +$171,701,841 | +16.36% | |
| Aqr Capital Management Llc | 0.36% | 8,134,262 | $1,039,396,005 | $1,216,234,854 | +$176,838,849 | +17.01% | |
| Swedbank Ab | 0.88% | 7,092,813 | $1,030,656,656 | $1,060,517,400 | +$29,860,744 | +2.90% | |
| Hsbc Holdings Plc | 0.48% | 7,734,965 | $994,116,983 | $1,156,531,967 | +$162,414,984 | +16.34% | |
| Barrow Hanley Mewhinney & Strauss Llc | 2.86% | 7,331,418 | $942,087,213 | $1,096,193,619 | +$154,106,406 | +16.36% | |
| Swiss National Bank | 0.47% | 6,973,251 | $896,062,754 | $1,042,640,490 | +$146,577,736 | +16.36% | |
| Barclays Plc | 0.28% | 6,793,897 | $873,015,773 | $1,015,823,479 | +$142,807,706 | +16.36% | |
| Grantham, Mayo, Van Otterloo & Co. Llc | 1.96% | 6,785,008 | $871,873,732 | $1,014,494,396 | +$142,620,664 | +16.36% | |
| Sumitomo Mitsui Trust Group, Inc. | 0.50% | 5,979,041 | $868,814,448 | $893,986,210 | +$25,171,762 | +2.90% | |
| Aristotle Capital Management, Llc | 1.77% | 6,578,570 | $845,353,780 | $983,627,786 | +$138,274,006 | +16.36% | |
| Voya Investment Management Llc | 0.72% | 6,484,756 | $833,291,318 | $969,600,717 | +$136,309,399 | +16.36% | |
| Raymond James Financial Inc | 0.22% | 6,236,773 | $801,425,620 | $932,522,299 | +$131,096,679 | +16.36% | |
| Mitsubishi Ufj Asset Management Co., Ltd. | 0.44% | 6,184,340 | $794,576,951 | $924,682,517 | +$130,105,566 | +16.37% | |
| National Pension Service | 0.48% | 5,791,782 | $744,243,987 | $865,987,245 | +$121,743,258 | +16.36% | |
| Pnc Financial Services Group, Inc. | 0.39% | 5,611,447 | $721,070,971 | $839,023,555 | +$117,952,584 | +16.36% | |
| Vanguard Asset Management, Ltd | 0.49% | 5,593,255 | $718,733,268 | $836,303,488 | +$117,570,220 | +16.36% | |
| Bank Of Montreal | 0.26% | 5,565,728 | $715,196,010 | $832,187,651 | +$116,991,641 | +16.36% | |
| Vanguard Global Advisers, Llc | 0.33% | 5,512,538 | $708,361,133 | $824,234,682 | +$115,873,549 | +16.36% |
Frequently asked questions about MRK
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Who are the largest institutional holders of MRK?
The largest institutional holders of MRK reported in the latest SEC Form 13F filings include Blackrock, Inc. , Vanguard Capital Management Llc , State Street Corp , Wellington Management Group Llp , and Vanguard Portfolio Management Llc . InsiderSet ranks institutional holders by their latest reported MRK position.
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What is MRK institutional ownership?
This page tracks MRK positions reported by institutional investment managers through SEC Form 13F. MERCK & CO. INC. (MRK) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
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How many institutions own MRK?
InsiderSet currently tracks 3,870 institutional managers reporting MRK holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of MRK shareholders.
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How much MRK stock do institutions own?
Institutional investment managers disclosed approximately $248.31B in MRK holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
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When was MRK institutional ownership last updated?
The latest MRK institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
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Are institutional MRK holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its MRK position after the reporting date.
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Are institutions buying or selling MRK?
Institutional buying and selling can be analyzed by comparing MRK positions across consecutive 13F reporting periods. InsiderSet's MRK Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View MRK ownership changes.
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How has MRK institutional ownership changed over time?
InsiderSet tracks MRK institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.