Merck & Co., Inc. (MRK) Shareholders & Insider Trades
Merck & Co., Inc. shareholders at a glance
The largest holder of Merck & Co., Inc. stock is BlackRock Advisors LLC, with 166.9 million shares (6.76% of the company), worth about $24.66 billion as of September 25, 2026. The 10 largest holders together own 35.0%.
In Q2 2026, 3,984 institutional holdings reports listed 2.47 billion shares worth $259.00 billion, up 28.0% in shares from Q1 2026.
Insiders reported 78 transactions in the last two years: 25 sales worth $73.80 million and 2 purchases. The newest one on file is from August 13, 2026 (Guindo Chirfi, Officer).
Major holders as of September 25, 2026; quarterly totals from institutional holdings reports (latest Q2 2026); insider transactions on file through August 13, 2026.
Merck & Co., Inc.
Shareholders Summary
2026Q2
Ownership by Type
Geographic Distribution
Largest Merck & Co., Inc. shareholders
| Holder | Shares | % of company | Value |
|---|---|---|---|
| BlackRock Advisors LLC | 166.9 million | 6.76% | $24.7B |
| Vanguard Capital Management LLC | 161.3 million | 6.54% | $23.8B |
| State Street Corporation | 120.4 million | 4.88% | $17.8B |
| Wellington Trust Co., NA | 86.2 million | 3.50% | $12.7B |
| Vanguard Portfolio Management LLC | 67.7 million | 2.75% | $10.0B |
| Geode Capital Management LLC | 60.7 million | 2.46% | $9.0B |
| Charles Schwab Investment Management, Inc. | 54.4 million | 2.20% | $8.0B |
| BlackRock Life Ltd. | 51.6 million | 2.09% | $7.6B |
| Eaton Vance Management | 48.6 million | 1.97% | $7.2B |
| Fidelity Management & Research Co. LLC | 45.4 million | 1.84% | $6.7B |
As of September 25, 2026.
Merck & Co., Inc. institutional holdings by quarter
| Quarter | Reports | Shares | Value |
|---|---|---|---|
| Q2 2026 | 3,984 | 2.47 billion | $259.0B |
| Q1 2026 | 3,940 | 1.93 billion | $232.0B |
| Q4 2025 | 3,802 | 1.97 billion | $208.0B |
| Q3 2025 | 3,477 | 1.94 billion | $163.0B |
| Q2 2025 | 3,484 | 2.00 billion | $158.0B |
| Q1 2025 | 3,596 | 1.99 billion | $181.0B |
| Q4 2024 | 3,764 | 1.99 billion | $198.0B |
| Q3 2024 | 3,648 | 2.00 billion | $226.0B |
Shares and value held by institutions that file quarterly holdings reports (options not included).
Merck & Co., Inc. insider trades
| Insider | Date | Title | Transaction | Value |
|---|---|---|---|---|
| Guindo Chirfi | Aug 13, 2026 | Officer | Sale at price 135.00 per share. | $1.4M |
| Zachary Jennifer L | Aug 12, 2026 | General Counsel | Sale at price 133.46 per share. | $10.7M |
| Deluca Richard Robert Jr. | Aug 12, 2026 | Officer | Sale at price 130.43 - 132.35 per share. | $5.9M |
| Zachary Jennifer L | Aug 12, 2026 | General Counsel | Conversion of Exercise of derivative security at price 84.71 - 117.89 per share. | $6.0M |
| Guindo Chirfi | Aug 6, 2026 | Officer | Sale at price 131.00 per share. | $2.0M |
| Deluca Richard Robert Jr. | Aug 6, 2026 | Officer | Sale at price 130.23 - 131.02 per share. | $788,773 |
| Williams David Michael | Aug 5, 2026 | Chief Technology Officer | Sale at price 128.77 per share. | $6.8M |
| Maraldo David R. | Aug 5, 2026 | Officer | Sale at price 128.72 per share. | $2.4M |
| Williams David Michael | Aug 5, 2026 | Chief Technology Officer | Conversion of Exercise of derivative security at price 73.73 - 77.62 per share. | $3.9M |
| Maraldo David R. | Aug 5, 2026 | Officer | Conversion of Exercise of derivative security at price 73.73 - 87.10 per share. | $1.5M |
| Smart Dalton E. Iii | May 1, 2026 | Officer | Conversion of Exercise of derivative security at price 112.16 per share. | $42,957 |
| Maraldo David R. | May 1, 2026 | Officer | Conversion of Exercise of derivative security at price 112.16 per share. | $61,912 |
Newest 12 of 78 insider transactions in the last two years.
Questions and answers
Who owns the most Merck & Co., Inc. stock?
BlackRock Advisors LLC, with 6.76% of the company (as of September 25, 2026). Next: Vanguard Capital Management LLC (6.54%) and State Street Corporation (4.88%).
How many institutions own Merck & Co., Inc. stock?
3,984 institutional holdings reports listed Merck & Co., Inc. shares in Q2 2026, 2.47 billion shares in all worth $259.00 billion.
Are Merck & Co., Inc. insiders buying or selling the stock?
In the last two years insiders reported 25 sales and 2 purchases (78 transactions in all); the newest on file is from August 13, 2026.
