Merck & Co MRK
$146.73 −$0.21 (-0.14%)
Market closed · Nov 6, 8:10 pm ET · Last extended-hours $146.73 0.00%
Open$144.34
Prev close$146.94
Day range$142.80 – $147.48
Volume7.63M
Market cap$361.73B
P/E (TTM)148.2
Dividend yield2.32%
Ownership & positioning
Who holds it, who is betting against it, and where the big money is moving
Institutional ownership81.3%-0.07 pts vs. prior quarter
Institutions holding4,456+83 vs. prior quarter
Insider trades (recent)41 buys / 8 sellsNet buying
Short interest1.09% of floatDays to cover 3.0 · as of 15 Oct 2026
Short-sale volume share18.2%5-day average of daily volume
Short-sale volume as % of daily volume
Large-order net flow, last 20 sessions
Net of large-order buying minus selling, in USD. Over this window: −$35.63M (9 inflow days, 11 outflow days).
Net flow by order size, last 20 sessions
Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.
The five largest holders on file together own 27.4% of shares outstanding.
Largest holders
By investor type
Reported short interest has fallen from 1.15% to 1.09% of float over the last 6 biweekly reports (31 Jul 2026 to 15 Oct 2026).
Recent institutional activity
| Holder | Type | Period | Share change | New stake |
|---|---|---|---|---|
| Capital Research | Mutual Fund | 2026/Q3 | +14,919,306 | 0.7% |
| Fisher Investments | Mutual Fund | 2026/Q3 | +12,079,979 | 1.6% |
| Charles Schwab Investment Management | Mutual Fund | 2026/Q3 | +4,600,394 | 2.2% |
| Franklin Resources | Mutual Fund | 2026/Q3 | +3,000,235 | 0.7% |
| Dimensional Fund Advisors | Mutual Fund | 2026/Q3 | +2,030,447 | 0.7% |
| Assenagon Asset Management S.A. | Mutual Fund | 2026/Q3 | +1,959,778 | 0.1% |
| Wellington Management Group | Mutual Fund | 2026/Q3 | +1,934,312 | 3.5% |
| AllianceBernstein | Mutual Fund | 2026/Q3 | +1,830,456 | 0.5% |
| FMR | Mutual Fund | 2026/Q3 | +1,533,457 | 1.3% |
| Goldman Sachs Asset Management, L.P. | Mutual Fund | 2026/Q3 | +1,418,498 | 0.6% |
| SG Americas Securities, LLC | Private Company | 2026/Q3 | +1,406,722 | 0.1% |
| Voya Investment Management LLC | Mutual Fund | 2026/Q3 | +1,324,929 | 0.3% |
| Geode Capital Management, LLC | Mutual Fund | 2026/Q3 | +1,186,060 | 2.5% |
| BlackRock | Mutual Fund | 2026/Q3 | +1,169,507 | 9.2% |
| Columbia Management Investment Advisers, LLC | Mutual Fund | 2026/Q3 | +1,124,727 | 0.7% |
Institutional buy/sell activity by reporting period, largest moves first.
Insider transactions
| Date | Insider | Title | Transaction | Shares | Price | Held after |
|---|---|---|---|---|---|---|
| 29 Sep 2026 | Christine Seidman | Independent Director | Other Derivative Acquisition | +55 | – | 21,490 |
| 29 Sep 2026 | Surendralal Karsanbhai | Independent Director | Other Derivative Acquisition | +111 | – | 5,667 |
| 29 Sep 2026 | Mary Coe | Independent Director | Other Derivative Acquisition | +206 | – | 32,420 |
| 31 Aug 2026 | Gaurav Gupta | Executive Vice President and Chief Information & Digital Officer | Initial Statement of Beneficial | +0 | – | 19,443 |
| 12 Aug 2026 | Chirfi Guindo | Executive Vice President of Strategic Access, Policy & Communications | Open Market Disposition | -10,000 | $135.00 | 36,670 |
| 11 Aug 2026 | Jennifer Zachary | Executive Vice President | Open Market Disposition | -25,388 | $133.46 | 45,509 |
| 11 Aug 2026 | Jennifer Zachary | Executive Vice President | Derivative Exercise and Sale | -54,927 | $133.46 | 45,509 |
| 11 Aug 2026 | Richard DeLuca | Executive VP & President of Merck Animal Health | Open Market Disposition | -45,320 | $132.35 | 111,488 |
| 5 Aug 2026 | Richard DeLuca | Executive VP & President of Merck Animal Health | Open Market Disposition | -6,050 | $131.02 | 156,808 |
| 5 Aug 2026 | Chirfi Guindo | Executive Vice President of Strategic Access, Policy & Communications | Open Market Disposition | -15,000 | $131.00 | 46,670 |
| 4 Aug 2026 | David Williams | Former Executive VP and Chief Information & Digital Officer | Derivative Exercise and Sale | -52,847 | $128.77 | 31,716 |
| 4 Aug 2026 | David Maraldo | Executive VP & President of Merck Manufacturing Division | Derivative Exercise and Sale | -18,706 | $128.72 | 26,572 |
| 29 Jun 2026 | Christine Seidman | Independent Director | Other Derivative Acquisition | +63 | – | 21,291 |
| 29 Jun 2026 | Surendralal Karsanbhai | Independent Director | Other Derivative Acquisition | +126 | – | 5,519 |
| 29 Jun 2026 | Mary Coe | Independent Director | Other Derivative Acquisition | +233 | – | 31,999 |
| 28 May 2026 | Pamela Craig | Independent Director | Other Derivative Acquisition | +1,853 | – | 34,945 |
| 28 May 2026 | Patricia Russo | Independent Director | Other Derivative Acquisition | +1,853 | – | 62,391 |
| 28 May 2026 | Thomas Glocer | Lead Independent Director | Other Derivative Acquisition | +1,853 | – | 110,912 |
| 28 May 2026 | Risa Lavizzo-Mourey | Independent Director | Other Derivative Acquisition | +1,853 | – | 17,749 |
| 28 May 2026 | Douglas Baker | Independent Director | Other Derivative Acquisition | +1,853 | – | 11,518 |
From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.
Short interest, by report
| Report date | Shares short | % of float | Days to cover |
|---|---|---|---|
| 15 Oct 2026 | 26,825,098 | 1.1% | 3.0 |
| 30 Sep 2026 | 28,271,750 | 1.1% | 2.5 |
| 15 Sep 2026 | 34,430,712 | 1.4% | 4.2 |
| 31 Aug 2026 | 30,287,347 | 1.2% | 2.2 |
| 14 Aug 2026 | 24,506,520 | 1.0% | 2.8 |
| 31 Jul 2026 | 28,281,375 | 1.1% | 3.3 |
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