MERCK & CO. INC. (MRK) Institutional Shareholders
MERCK & CO. INC. (MRK) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $217.40B in MRK holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of MRK tracked by InsiderSet, reporting ownership valued at approximately $27.17B 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 $28.79B, representing an estimated gain of +5.99% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 49% 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
3,691
Total Reported Value
$217.40B
Largest Holder
Blackrock, Inc.
Largest Position
$27.17B
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
19
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.48% | 225,830,330 | $27,165,130,301 | $28,793,367,075 | +$1,628,236,774 | +5.99% | |
| Vanguard Capital Management Llc | 0.48% | 160,987,624 | $19,365,201,291 | $20,525,922,060 | +$1,160,720,769 | +5.99% | |
| State Street Corp | 0.50% | 119,325,673 | $14,453,274,004 | $15,214,023,308 | +$760,749,304 | +5.26% | |
| Wellington Management Group Llp | 1.89% | 84,314,971 | $10,142,247,862 | $10,750,158,803 | +$607,910,941 | +5.99% | |
| Vanguard Portfolio Management Llc | 0.43% | 67,304,305 | $8,096,034,848 | $8,581,298,888 | +$485,264,040 | +5.99% | |
| Geode Capital Management, Llc | 0.44% | 59,558,154 | $7,140,235,212 | $7,593,664,635 | +$453,429,423 | +6.35% | |
| Charles Schwab Investment Management Inc | 0.91% | 49,765,225 | $5,986,904,095 | $6,345,066,188 | +$358,162,093 | +5.98% | |
| Morgan Stanley | 0.35% | 47,632,487 | $5,729,712,158 | $6,073,142,093 | +$343,429,935 | +5.99% | |
| Fmr Llc | 0.28% | 44,516,010 | $5,354,830,881 | $5,675,791,275 | +$320,960,394 | +5.99% | |
| Bank Of America Corp | 0.27% | 30,774,221 | $3,701,831,129 | $3,923,713,178 | +$221,882,049 | +5.99% | |
| Northern Trust Corp | 0.43% | 27,090,023 | $3,258,658,868 | $3,453,977,933 | +$195,319,065 | +5.99% | |
| Fisher Asset Management, Llc | 1.08% | 26,436,284 | $3,180,020,742 | $3,370,626,210 | +$190,605,468 | +5.99% | |
| Invesco Ltd. | 0.40% | 21,855,101 | $2,628,950,044 | $2,786,525,378 | +$157,575,334 | +5.99% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.51% | 20,414,819 | $2,455,698,578 | $2,602,889,423 | +$147,190,845 | +5.99% | |
| Goldman Sachs Group Inc | 0.32% | 20,133,379 | $2,421,844,110 | $2,567,005,823 | +$145,161,713 | +5.99% | |
| Legal & General Group Plc | 0.54% | 19,538,545 | $2,350,291,572 | $2,491,164,488 | +$140,872,916 | +5.99% | |
| Bank Of New York Mellon Corp | 0.41% | 18,713,363 | $2,251,030,420 | $2,385,953,783 | +$134,923,363 | +5.99% | |
| Storebrand Asset Management As | 0.74% | 24,579,768 | $2,215,994,967 | $3,133,920,420 | +$917,925,453 | +41.42% | |
| Ameriprise Financial Inc | 0.45% | 16,262,708 | $1,959,703,194 | $2,073,495,270 | +$113,792,076 | +5.81% | |
| Franklin Resources Inc | 0.48% | 16,267,205 | $1,956,782,124 | $2,074,068,638 | +$117,286,514 | +5.99% | |
| Dimensional Fund Advisors Lp | 0.39% | 15,456,039 | $1,858,937,753 | $1,970,644,973 | +$111,707,220 | +6.01% | |
| Vanguard Fiduciary Trust Co | 0.43% | 13,964,179 | $1,679,751,092 | $1,780,432,823 | +$100,681,731 | +5.99% | |
| Ubs Group Ag | 0.30% | 13,933,630 | $1,676,076,367 | $1,776,537,825 | +$100,461,458 | +5.99% | |
| State Farm Mutual Automobile Insurance Co | 1.31% | 13,794,969 | $1,659,396,821 | $1,758,858,548 | +$99,461,727 | +5.99% | |
| Amundi | 0.45% | 13,764,954 | $1,655,786,935 | $1,755,031,635 | +$99,244,700 | +5.99% | |
| Royal Bank Of Canada | 0.30% | 13,201,722 | $1,588,035,000 | $1,683,219,555 | +$95,184,555 | +5.99% | |
| Deutsche Bank Ag\ | 0.50% | 12,540,774 | $1,508,529,702 | $1,598,948,685 | +$90,418,983 | +5.99% | |
| Harris Associates L P | 1.99% | 12,366,933 | $1,487,618,401 | $1,576,783,958 | +$89,165,557 | +5.99% | |
| Wells Fargo & Company/Mn | 0.27% | 11,446,845 | $1,376,940,860 | $1,459,472,738 | +$82,531,878 | +5.99% | |
| Nuveen, Llc | 0.33% | 10,099,764 | $1,214,900,665 | $1,287,719,910 | +$72,819,245 | +5.99% | |
| Alliancebernstein L.P. | 0.39% | 11,301,486 | $1,189,594,416 | $1,440,939,465 | +$251,345,049 | +21.13% | |
| Aqr Capital Management Llc | 0.48% | 8,628,486 | $1,037,920,515 | $1,100,131,965 | +$62,211,450 | +5.99% | |
| Nordea Investment Management Ab | 0.95% | 8,527,993 | $1,019,265,724 | $1,087,319,108 | +$68,053,384 | +6.68% | |
| Stifel Financial Corp | 0.92% | 8,291,826 | $997,426,827 | $1,057,207,815 | +$59,780,988 | +5.99% | |
| Barrow Hanley Mewhinney & Strauss Llc | 3.12% | 7,917,866 | $952,440,101 | $1,009,527,915 | +$57,087,814 | +5.99% | |
| Hsbc Holdings Plc | 0.55% | 7,634,112 | $918,380,455 | $973,349,280 | +$54,968,825 | +5.99% | |
| Barclays Plc | 0.32% | 7,557,518 | $909,093,843 | $963,583,545 | +$54,489,702 | +5.99% | |
| California Public Employees Retirement System | 0.55% | 7,383,088 | $888,111,656 | $941,343,720 | +$53,232,064 | +5.99% | |
| Swiss National Bank | 0.50% | 7,284,151 | $876,210,524 | $928,729,253 | +$52,518,729 | +5.99% | |
| Grantham, Mayo, Van Otterloo & Co. Llc | 2.16% | 7,013,777 | $843,687,399 | $894,256,568 | +$50,569,169 | +5.99% | |
| Aristotle Capital Management, Llc | 1.74% | 6,894,432 | $829,339,126 | $879,040,080 | +$49,700,954 | +5.99% | |
| Swedbank Ab | 0.70% | 6,360,649 | $817,343,408 | $810,982,748 | -$6,360,661 | -0.78% | |
| Raymond James Financial Inc | 0.25% | 6,585,514 | $791,912,367 | $839,653,035 | +$47,740,668 | +6.03% | |
| Sumitomo Mitsui Trust Group, Inc. | 0.49% | 6,269,316 | $754,136,022 | $799,337,790 | +$45,201,768 | +5.99% | |
| Jennison Associates Llc | 0.52% | 6,249,337 | $751,732,708 | $796,790,468 | +$45,057,760 | +5.99% | |
| Pnc Financial Services Group, Inc. | 0.45% | 5,830,086 | $701,301,075 | $743,335,965 | +$42,034,890 | +5.99% | |
| Mitsubishi Ufj Asset Management Co., Ltd. | 0.47% | 5,782,329 | $695,576,634 | $737,246,948 | +$41,670,314 | +5.99% | |
| National Pension Service | 0.53% | 5,762,086 | $693,121,325 | $734,665,965 | +$41,544,640 | +5.99% | |
| Vanguard Global Advisers, Llc | 0.36% | 5,585,694 | $671,903,131 | $712,175,985 | +$40,272,854 | +5.99% | |
| American Century Companies Inc | 0.34% | 5,547,858 | $667,352,020 | $707,351,895 | +$39,999,875 | +5.99% |
Frequently asked questions about MRK
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Who owns the most MRK stock?
The largest holders of MRK 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 MERCK & CO. INC. (MRK).
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Is MRK widely held by superinvestors?
Many widely followed stocks like MRK appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly MRK is represented among the institutional managers we track.
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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.