Merck
MRK · NYSE
Who owns MRK
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 32.4% of MRK’s shares.
- Vanguard Capital Management, LLC6.5%
- BlackRock Institutional Trust Company, N.A.5.5%
- State Street Investment Management (US)4.9%
- Wellington Management Company, LLP3.5%
- Next 6 largest institutions12.0%
- All other shareholders67.6%
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Capital Management, LLC | 161.32M | 6.53% |
| BlackRock Institutional Trust Company, N.A. | 136.80M | 5.54% |
| State Street Investment Management (US) | 120.41M | 4.88% |
| Wellington Management Company, LLP | 86.25M | 3.49% |
| Vanguard Portfolio Management, LLC | 67.74M | 2.74% |
| Geode Capital Management, L.L.C. | 60.74M | 2.46% |
| Charles Schwab Investment Management, Inc. | 54.37M | 2.20% |
| Fisher Investments | 38.52M | 1.56% |
| Fidelity Management & Research Company LLC | 37.28M | 1.51% |
| Norges Bank Investment Management (NBIM) | 36.98M | 1.50% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Total Stock Market Index Fund | 78.65M | 3.18% |
| Vanguard 500 Index Fund | 64.83M | 2.62% |
| Schwab U.S. Dividend Equity ETF | 36.19M | 1.47% |
| Statens Pensjonsfond Utland | 35.03M | 1.42% |
| iShares Core S&P 500 ETF | 32.94M | 1.33% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $29.98M (17 trades) of MRK on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Seidman Christine E | Award | 56 | $8.14K |
| Karsanbhai Surendralal Lanca | Award | 112 | $16.27K |
| Coe Mary Ellen | Award | 206 | $29.93K |
| Guindo Chirfi | Sale | 10.00K | $1.35M |
| Zachary Jennifer | Option exercise | 13.43K | — |
| Zachary Jennifer | Option exercise | 41.49K | — |
| Zachary Jennifer | Sale | 80.31K | $10.72M |
| Zachary Jennifer | Option exercise | 13.43K | $1.14M |
| Zachary Jennifer | Option exercise | 41.49K | $4.89M |
| DeLuca Richard R. | Sale | 600 | $79.22K |
Congressional trades
Disclosed by members of Congress over the last 12 months
| Member | Type | Amount | Traded |
|---|---|---|---|
| Maria ElviraHouse | Sale | $1K–$15K | Sep 24, 2026 |
| Maria ElviraHouse | Purchase | $15K–$50K | Aug 19, 2026 |
| Maria ElviraHouse | Purchase | $15K–$50K | Aug 19, 2026 |
| Alan ArmstrongSenator | Sale (Full) | $15K–$50K | Mar 27, 2026 |
| Josh GottheimerHouse | Purchase | $1K–$15K | Feb 4, 2026 |
| Michael McCaulHouse | Sale | $15K–$50K | Jan 13, 2026 |
| Gil CisnerosHouse | Purchase | $1K–$15K | Dec 19, 2025 |
| Julie JohnsonHouse | Sale | $1K–$15K | Dec 18, 2025 |
| Gil CisnerosHouse | Purchase | $1K–$15K | Nov 18, 2025 |
| Julie JohnsonHouse | Sale | $1K–$15K | Nov 13, 2025 |
| Michael McCaulHouse | Sale | $15K–$50K | Oct 27, 2025 |
Short interest
Settled Sep 30, 2026
- Shares short
- 28.27M
- Days to cover
- 2.53
- % of shares outstanding
- 1.14%
- Average daily volume
- 11.19M
- Change since last report
- −17.9%
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