MRK
Merck & Company Inc
NYSE: MRK · HEALTHCARE · DRUG MANUFACTURERS - GENERAL
$140.93
-0.63% today
Updated 2026-10-28
Market cap
$360.08B
P/E ratio
115.83
P/S ratio
5.41x
EPS (TTM)
$1.26
Dividend yield
2.29%
52W range
$80 – $156
Volume
10.6M
Merck & Company Inc (MRK) Insider transactions
Net insider activity
Net buying (506,208 shares)
Buy transactions
61
Sell transactions
39
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-09-30 | SEIDMAN, CHRISTINE E | Director | Buy | 56 | $145.31 | $8137.36 |
| 2026-09-30 | KARSANBHAI, SURENDRALAL LANCA | Director | Buy | 112 | $145.31 | $16274.72 |
| 2026-09-30 | COE, MARY ELLEN | Director | Buy | 206 | $145.31 | $29933.86 |
| 2026-08-13 | GUINDO, CHIRFI | EVP, Access, Policy & Comms | Sale | 10,000 | $135.00 | $1.35M |
| 2026-08-12 | ZACHARY, JENNIFER | EVP, General Counsel | Sale | 41,494 | — | — |
| 2026-08-12 | ZACHARY, JENNIFER | EVP, General Counsel | Sale | 13,433 | — | — |
| 2026-08-12 | ZACHARY, JENNIFER | EVP, General Counsel | Sale | 80,315 | $133.46 | $10.72M |
| 2026-08-12 | ZACHARY, JENNIFER | EVP, General Counsel | Buy | 41,494 | $117.89 | $4.89M |
| 2026-08-12 | ZACHARY, JENNIFER | EVP, General Counsel | Buy | 13,433 | $84.71 | $1.14M |
| 2026-08-12 | DELUCA, RICHARD R. | EVP&Pres, Merck Animal Heallth | Sale | 11,099 | $131.61 | $1.46M |
| 2026-08-12 | DELUCA, RICHARD R. | EVP&Pres, Merck Animal Heallth | Sale | 600 | $132.04 | $79222.02 |
| 2026-08-11 | DELUCA, RICHARD R. | EVP&Pres, Merck Animal Heallth | Sale | 7,410 | $131.33 | $973164.93 |
| 2026-08-11 | DELUCA, RICHARD R. | EVP&Pres, Merck Animal Heallth | Sale | 5,427 | $132.35 | $718261.28 |
| 2026-08-10 | DELUCA, RICHARD R. | EVP&Pres, Merck Animal Heallth | Sale | 20,784 | $130.43 | $2.71M |
| 2026-08-06 | GUINDO, CHIRFI | EVP, Access, Policy & Comms | Sale | 15,000 | $131.00 | $1.97M |
| 2026-08-06 | DELUCA, RICHARD R. | EVP&Pres, Merck Animal Heallth | Sale | 4,945 | $130.23 | $643993.28 |
| 2026-08-06 | DELUCA, RICHARD R. | EVP&Pres, Merck Animal Heallth | Sale | 805 | $131.02 | $105472.39 |
| 2026-08-06 | DELUCA, RICHARD R. | EVP&Pres, Merck Animal Heallth | Sale | 300 | $131.02 | $39306.99 |
| 2026-08-05 | WILLIAMS, DAVID MICHAEL | EVP,Chief Info&Digital Officer | Sale | 34,705 | — | — |
| 2026-08-05 | WILLIAMS, DAVID MICHAEL | EVP,Chief Info&Digital Officer | Sale | 13,542 | — | — |
| 2026-08-05 | WILLIAMS, DAVID MICHAEL | EVP,Chief Info&Digital Officer | Sale | 4,600 | — | — |
| 2026-08-05 | WILLIAMS, DAVID MICHAEL | EVP,Chief Info&Digital Officer | Buy | 34,705 | $73.73 | $2.56M |
| 2026-08-05 | WILLIAMS, DAVID MICHAEL | EVP,Chief Info&Digital Officer | Buy | 13,542 | $75.36 | $1.02M |
| 2026-08-05 | WILLIAMS, DAVID MICHAEL | EVP,Chief Info&Digital Officer | Buy | 4,600 | $77.62 | $357052.00 |
| 2026-08-05 | MARALDO, DAVID R. | EVP & Pres. MMD | Sale | 9,709 | — | — |
| 2026-08-05 | MARALDO, DAVID R. | EVP & Pres. MMD | Sale | 6,311 | — | — |
| 2026-08-05 | MARALDO, DAVID R. | EVP & Pres. MMD | Sale | 2,686 | — | — |
| 2026-08-05 | MARALDO, DAVID R. | EVP & Pres. MMD | Buy | 9,709 | $87.10 | $845653.90 |
| 2026-08-05 | MARALDO, DAVID R. | EVP & Pres. MMD | Buy | 6,311 | $73.73 | $465310.03 |
| 2026-08-05 | MARALDO, DAVID R. | EVP & Pres. MMD | Buy | 2,686 | $84.71 | $227531.06 |
| 2026-06-30 | SEIDMAN, CHRISTINE E | Director | Buy | 63 | $128.50 | $8095.50 |
| 2026-06-30 | KARSANBHAI, SURENDRALAL LANCA | Director | Buy | 126 | $128.50 | $16191.00 |
| 2026-06-30 | COE, MARY ELLEN | Director | Buy | 233 | $128.50 | $29940.50 |
| 2026-05-29 | WARDEN, KATHY J | Director | Buy | 1,853 | $118.72 | $219988.16 |
| 2026-05-29 | THULIN, INGE G | Director | Buy | 1,853 | $118.72 | $219988.16 |
| 2026-05-29 | SEIDMAN, CHRISTINE E | Director | Buy | 1,853 | $118.72 | $219988.16 |
| 2026-05-29 | RUSSO, PATRICIA F | Director | Buy | 1,853 | $118.72 | $219988.16 |
| 2026-05-29 | ROTHMAN, PAUL | Director | Buy | 1,853 | $118.72 | $219988.16 |
| 2026-05-29 | MAYO, STEPHEN | Director | Buy | 1,853 | $118.72 | $219988.16 |
| 2026-05-29 | LAVIZZO-MOUREY, RISA J | Director | Buy | 1,853 | $118.72 | $219988.16 |
| 2026-05-29 | KARSANBHAI, SURENDRALAL LANCA | Director | Buy | 1,853 | $118.72 | $219988.16 |
| 2026-05-29 | GLOCER, THOMAS H | Director | Buy | 1,853 | $118.72 | $219988.16 |
| 2026-05-29 | CRAIG, PAMELA J. | Director | Buy | 1,853 | $118.72 | $219988.16 |
| 2026-05-29 | COE, MARY ELLEN | Director | Buy | 1,853 | $118.72 | $219988.16 |
| 2026-05-29 | BAKER, DOUGLAS M JR | Director | Buy | 1,853 | $118.72 | $219988.16 |
| 2026-05-05 | ZACHARY, JENNIFER | EVP, General Counsel | Buy | 35,312 | — | — |
| 2026-05-05 | ZACHARY, JENNIFER | EVP, General Counsel | Buy | 12,064 | — | — |
| 2026-05-05 | WILLIAMS, DAVID MICHAEL | EVP,Chief Info&Digital Officer | Buy | 13,582 | — | — |
| 2026-05-05 | WILLIAMS, DAVID MICHAEL | EVP,Chief Info&Digital Officer | Buy | 4,640 | — | — |
| 2026-05-05 | SMART, DALTON E. III | SVP Fin. - Global Controller | Buy | 5,045 | — | — |
| 2026-05-05 | SMART, DALTON E. III | SVP Fin. - Global Controller | Buy | 2,298 | — | — |
| 2026-05-05 | OOSTHUIZEN, JOHANNES JACOBUS | EVP, Oncology & Int?l | Buy | 31,044 | — | — |
| 2026-05-05 | OOSTHUIZEN, JOHANNES JACOBUS | EVP, Oncology & Int?l | Buy | 10,605 | — | — |
| 2026-05-05 | MARALDO, DAVID R. | EVP & Pres. MMD | Buy | 21,731 | — | — |
| 2026-05-05 | MARALDO, DAVID R. | EVP & Pres. MMD | Buy | 7,424 | — | — |
| 2026-05-05 | LITCHFIELD, CAROLINE | EVP & CFO | Buy | 46,566 | — | — |
| 2026-05-05 | LITCHFIELD, CAROLINE | EVP & CFO | Buy | 15,908 | — | — |
| 2026-05-05 | LI, DEAN Y | Executive VP & President, MRL | Buy | 58,207 | — | — |
| 2026-05-05 | LI, DEAN Y | Executive VP & President, MRL | Buy | 19,885 | — | — |
| 2026-05-05 | LARSON, BETTY D | EVP, Chief HR Officer | Buy | 23,283 | — | — |
| 2026-05-05 | LARSON, BETTY D | EVP, Chief HR Officer | Buy | 7,954 | — | — |
| 2026-05-05 | GUINDO, CHIRFI | EVP, Access, Policy & Comms | Buy | 19,402 | — | — |
| 2026-05-05 | GUINDO, CHIRFI | EVP, Access, Policy & Comms | Buy | 6,628 | — | — |
| 2026-05-05 | FOARD, BRIAN | EVP, Specialty, Pharma, & ID | Buy | 31,044 | — | — |
| 2026-05-05 | FOARD, BRIAN | EVP, Specialty, Pharma, & ID | Buy | 35,351 | — | — |
| 2026-05-05 | FOARD, BRIAN | EVP, Specialty, Pharma, & ID | Buy | 10,605 | — | — |
| 2026-05-05 | DELUCA, RICHARD R. | EVP&Pres, Merck Animal Heallth | Buy | 34,924 | — | — |
| 2026-05-05 | DELUCA, RICHARD R. | EVP&Pres, Merck Animal Heallth | Buy | 11,931 | — | — |
| 2026-05-05 | DAVIS, ROBERT M | Director, Chairman, CEO & President | Buy | 139,697 | — | — |
| 2026-05-05 | DAVIS, ROBERT M | Director, Chairman, CEO & President | Buy | 47,724 | — | — |
| 2026-05-02 | SMART, DALTON E. III | SVP Fin. - Global Controller | Sale | 383 | — | — |
| 2026-05-02 | SMART, DALTON E. III | SVP Fin. - Global Controller | Buy | 383 | $112.16 | $42957.28 |
| 2026-05-02 | SMART, DALTON E. III | SVP Fin. - Global Controller | Sale | 132 | $112.16 | $14805.12 |
| 2026-05-02 | MARALDO, DAVID R. | EVP & Pres. MMD | Sale | 552 | — | — |
| 2026-05-02 | MARALDO, DAVID R. | EVP & Pres. MMD | Buy | 552 | $112.16 | $61912.32 |
| 2026-05-02 | MARALDO, DAVID R. | EVP & Pres. MMD | Sale | 159 | $112.16 | $17833.44 |
| 2026-04-30 | SMART, DALTON E. III | SVP Fin. - Global Controller | Sale | 464 | — | — |
| 2026-04-30 | SMART, DALTON E. III | SVP Fin. - Global Controller | Buy | 464 | $110.95 | $51480.80 |
| 2026-04-30 | SMART, DALTON E. III | SVP Fin. - Global Controller | Sale | 159 | $110.95 | $17641.05 |
| 2026-04-30 | LARSON, BETTY D | EVP, Chief HR Officer | Sale | 11,350 | — | — |
| 2026-04-30 | LARSON, BETTY D | EVP, Chief HR Officer | Buy | 11,350 | $110.95 | $1.26M |
| 2026-04-30 | LARSON, BETTY D | EVP, Chief HR Officer | Sale | 5,143 | $110.95 | $570615.85 |
| 2026-04-29 | ZACHARY, JENNIFER | EVP, General Counsel | Sale | 2,951 | — | — |
| 2026-04-29 | ZACHARY, JENNIFER | EVP, General Counsel | Buy | 2,951 | $110.03 | $324698.53 |
| 2026-04-29 | ZACHARY, JENNIFER | EVP, General Counsel | Sale | 1,454 | $110.03 | $159983.62 |
| 2026-04-29 | WILLIAMS, DAVID MICHAEL | EVP,Chief Info&Digital Officer | Sale | 1,377 | — | — |
| 2026-04-29 | WILLIAMS, DAVID MICHAEL | EVP,Chief Info&Digital Officer | Buy | 1,377 | $110.03 | $151511.31 |
| 2026-04-29 | WILLIAMS, DAVID MICHAEL | EVP,Chief Info&Digital Officer | Sale | 679 | $110.03 | $74710.37 |
| 2026-04-29 | SMART, DALTON E. III | SVP Fin. - Global Controller | Sale | 944 | — | — |
| 2026-04-29 | SMART, DALTON E. III | SVP Fin. - Global Controller | Buy | 944 | $110.03 | $103868.32 |
| 2026-04-29 | SMART, DALTON E. III | SVP Fin. - Global Controller | Sale | 324 | $110.03 | $35649.72 |
| 2026-04-29 | OOSTHUIZEN, JOHANNES JACOBUS | EVP, Oncology & Int?l | Sale | 1,377 | — | — |
| 2026-04-29 | OOSTHUIZEN, JOHANNES JACOBUS | EVP, Oncology & Int?l | Buy | 1,377 | $110.03 | $151511.31 |
| 2026-04-29 | OOSTHUIZEN, JOHANNES JACOBUS | EVP, Oncology & Int?l | Sale | 679 | $110.03 | $74710.37 |
| 2026-04-29 | LITCHFIELD, CAROLINE | EVP & CFO | Sale | 3,935 | — | — |
| 2026-04-29 | LITCHFIELD, CAROLINE | EVP & CFO | Buy | 3,935 | $110.03 | $432968.05 |
| 2026-04-29 | LITCHFIELD, CAROLINE | EVP & CFO | Sale | 1,938 | $110.03 | $213238.14 |
| 2026-04-29 | LI, DEAN Y | Executive VP & President, MRL | Sale | 4,722 | — | — |
| 2026-04-29 | LI, DEAN Y | Executive VP & President, MRL | Buy | 4,722 | $110.03 | $519561.66 |
| 2026-04-29 | LI, DEAN Y | Executive VP & President, MRL | Sale | 2,326 | $110.03 | $255929.78 |
Frequently asked questions
Are MRK insiders buying or selling?
Over the transactions on record, MRK insiders have been net buyers, with about $22.20M in stock sold across 39 sales, against 36 open-market purchases.
Does insider selling at MRK mean the stock will fall?
Not by itself. Most executive selling is pre-scheduled through 10b5-1 plans filed months in advance, and insiders sell for diversification, taxes, and liquidity far more often than out of any view on the price. Insider buying is the stronger signal, especially when several insiders buy around the same time, because there is usually only one reason to put personal cash into the stock.
Which MRK insiders are selling the most?
Recent selling is concentrated in a few names. ZACHARY, JENNIFER accounts for the largest share on record, with about $10.88M sold. Selling by one or two individuals matters less than broad selling across the whole leadership team, which is the pattern worth watching.