Merck & Company Inc
Ownership
Ownership Structure
Who owns Merck & Company Inc (MRK)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.8% of the shares are freely tradable; institutional investors hold 82.2%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 9.15 | 225,830,330 | +3.1 | 03/31/2026 |
| Vanguard Capital Management, LLC | 6.53 | 160,987,624 | +0.0 | 03/31/2026 |
| State Street Corp | 4.84 | 119,325,673 | -0.6 | 03/31/2026 |
| Wellington Management Company LLP | 3.50 | 86,249,283 | +2.3 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 2.73 | 67,304,305 | +0.0 | 03/31/2026 |
| Geode Capital Management, LLC | 2.41 | 59,558,154 | -0.8 | 03/31/2026 |
| JPMorgan Chase & Co | 2.15 | 52,972,983 | +81.4 | 03/31/2026 |
| Charles Schwab Investment Management Inc | 2.02 | 49,765,225 | +2.5 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.19 | 78,649,160 | +0.3 | 07/31/2026 |
| Vanguard 500 Index Investor | 2.63 | 64,831,228 | +1.1 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | 110,167 | 16,183,543 $ | Aug 12, 2026 | direct |
| Zachary Jennifer | EVP, General Counsel | 45,509 | 6,685,309 $ | Aug 12, 2026 | direct |
| Guindo Chirfi | EVP, Access, Policy & Comms | 36,613 | 5,378,468 $ | Aug 13, 2026 | direct |
| Williams David Michael | EVP,Chief Info&Digital Officer | 31,716 | 4,659,086 $ | Aug 5, 2026 | direct |
| Maraldo David R. | EVP & Pres. MMD | 18,212 | 2,675,407 $ | Aug 5, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 13, 2026 | Guindo Chirfi | EVP, Access, Policy & Comms | Sell | 10,000 | 135.00 | 1,350,000 |
| Aug 12, 2026 | Zachary Jennifer | EVP, General Counsel | Sell | 80,315 | 133.46 | 10,718,495 |
| Aug 12, 2026 | Zachary Jennifer | EVP, General Counsel | Other | 13,433 | 84.71 | 1,137,909 |
| Aug 12, 2026 | Zachary Jennifer | EVP, General Counsel | Other | 41,494 | 117.89 | 4,891,728 |
| Aug 12, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | Sell | 600 | 132.04 | 79,222 |
| Aug 12, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | Sell | 11,099 | 131.61 | 1,460,770 |
| Aug 11, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | Sell | 5,427 | 132.35 | 718,261 |
| Aug 11, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | Sell | 7,410 | 131.33 | 973,165 |
| Aug 10, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | Sell | 20,784 | 130.43 | 2,710,951 |
| Aug 6, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | Sell | 300 | 131.02 | 39,307 |
| Aug 6, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | Sell | 4,945 | 130.23 | 643,993 |
| Aug 6, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | Sell | 805 | 131.02 | 105,472 |
| Aug 6, 2026 | Guindo Chirfi | EVP, Access, Policy & Comms | Sell | 15,000 | 131.00 | 1,965,000 |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | Sell | 2,686 | 128.72 | 345,736 |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | Other | 2,686 | 84.71 | 227,531 |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | Sell | 9,709 | 128.72 | 1,249,722 |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | Other | 9,709 | 87.10 | 845,654 |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | Sell | 6,311 | 128.72 | 812,339 |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | Other | 6,311 | 73.73 | 465,310 |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | Sell | 34,705 | 128.77 | 4,468,987 |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | Other | 34,705 | 73.73 | 2,558,800 |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | Sell | 13,542 | 128.77 | 1,743,813 |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | Other | 13,542 | 75.36 | 1,020,525 |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | Sell | 4,600 | 128.77 | 592,345 |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | Other | 4,600 | 77.62 | 357,052 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 18, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.