| 2025-11-10 | Downing Cristal N | Chief Comm. & Public Afrs Ofcr | Sell | 7,085 | $87.00 | $616,395.00 | -100% | → |
| 2025-11-03 | Williams David Michael | EVP,Chief Info&Digital Officer | Sell | 8,614 | $83.59 | $720,039.95 | -26.0% | → |
| 2025-04-25 | Smart Dalton E. III | SVP Fin. - Global Controller | Sale+OE | 4,262 | $82.76 | $352,723.12 | -35.4% | → |
| 2025-02-19 | Oosthuizen Johannes Jacobus | President, U.S. Market | Sell | 8,500 | $84.09 | $714,744.60 | -21.7% | → |
| 2025-02-13 | Williams David Michael | EVP,Chief Info&Digital Officer | Sell | 6,000 | $85.34 | $512,056.80 | -19.9% | → |
| 2025-02-06 | THULIN INGE G | Director | Buy | 2,833 | $88.25 | $249,999.98 | +2,833% | → |
| 2025-02-06 | Downing Cristal N | Chief Comm. & Public Afrs Ofcr | Sell | 2,361 | $88.76 | $209,550.79 | -25.0% | → |
| 2025-02-05 | BAKER DOUGLAS M JR | Director | Buy | 15,000 | $88.50 | $1,327,500.00 | +1,500% | → |
| 2024-03-11 | Merck & Co., Inc. | - | Buy | 21,397,205 | $23.00 | $492,135,715.00 | -100.0% | → |
| 2024-02-14 | Litchfield Caroline | EVP & CFO | Sale+OE | 38,291 | $125.50 | $4,805,520.50 | -42.9% | → |
| 2024-02-14 | Davis Robert M | Chairman, CEO & President | Sale+OE | 235,021 | $125.69 | $29,538,998.07 | -18.0% | → |
| 2024-02-13 | Romanelli Joseph | President, Human Health Int?l | Sell | 1,000 | $124.89 | $124,887.90 | -4.9% | → |
| 2024-02-09 | Li Dean Y | Executive VP & President, MRL | Sale+OE | 14,702 | $125.50 | $1,845,083.36 | -24.1% | → |
| 2024-02-07 | Williams David Michael | EVP,Chief Info&Digital Officer | Sell | 1,451 | $127.57 | $185,108.28 | -6.8% | → |
| 2024-02-02 | Zachary Jennifer | EVP, General Counsel | Sale+OE | 49,499 | $126.97 | $6,284,779.13 | -63.0% | → |
| 2024-02-02 | Oosthuizen Johannes Jacobus | President, U.S. Market | Sale+OE | 18,959 | $127.17 | $2,411,110.82 | -44.8% | → |
| 2024-02-02 | MIZELL STEVEN | EVP, Chief HR Officer | Sale+OE | 50,694 | $126.65 | $6,420,349.48 | -68.2% | → |
| 2023-11-09 | Oosthuizen Johannes Jacobus | President, U.S. Market | Sell | 2,081 | $102.38 | $213,061.31 | -10.3% | → |
| 2023-11-08 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | Sell | 43,823 | $105.03 | $4,602,668.34 | -28.2% | → |
| 2023-08-14 | MIZELL STEVEN | EVP, Chief HR Officer | Sell | 4,250 | $109.01 | $463,292.50 | -15.6% | → |
| 2023-08-03 | MIZELL STEVEN | EVP, Chief HR Officer | Sell | 4,500 | $105.49 | $474,700.95 | -14.2% | → |
| 2023-08-02 | Romanelli Joseph | President, Human Health Int?l | Sell | 89 | $107.37 | $9,556.02 | -0.4% | → |
| 2023-05-04 | Zachary Jennifer | EVP, General Counsel | Sell | 19,141 | $117.59 | $2,250,834.21 | -35.3% | → |
| 2023-05-04 | Karachun Rita A | Sr. VP Fince-Global Controller | Sale+OE | 15,875 | $117.53 | $1,865,842.73 | -25.8% | → |
| 2023-05-03 | MIZELL STEVEN | EVP, Chief HR Officer | Sale+OE | 53,400 | $119.01 | $6,355,056.10 | -23.9% | → |
| 2023-05-02 | Williams David Michael | EVP,Chief Info&Digital Officer | Sale+OE | 7,509 | $116.82 | $877,222.41 | -40.4% | → |
| 2023-05-01 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | Sale+OE | 141,599 | $115.55 | $16,361,592.80 | -31.4% | → |
| 2023-04-28 | Davis Robert M | Chairman, CEO & President | Sale+OE | 143,329 | $114.93 | $16,472,844.97 | -34.5% | → |
| 2023-04-26 | Romanelli Joseph | President, Human Health Int?l | Buy | 150 | $105.91 | $15,886.16 | +0.2% | → |
| 2023-04-13 | Chattopadhyay Sanat | Exe V-P & Pres. MMD | Sale+OE | 134,055 | $115.07 | $15,425,067.93 | -66.4% | → |
| 2023-03-24 | Romanelli Joseph | President, Human Health Int?l | Sell | 35 | $104.65 | $3,662.75 | -0.2% | → |
| 2023-02-15 | Romanelli Joseph | President, Human Health Int?l | Sell | 5,000 | $108.22 | $541,100.50 | -19.8% | → |
| 2023-02-13 | MIZELL STEVEN | EVP, Chief HR Officer | Sell | 1,815 | $109.10 | $198,017.04 | -5.2% | → |
| 2023-02-09 | MIZELL STEVEN | EVP, Chief HR Officer | Sell | 5,000 | $107.00 | $535,006.50 | -12.5% | → |
| 2023-02-06 | MIZELL STEVEN | EVP, Chief HR Officer | Sell | 4,436 | $104.25 | $462,473.41 | -10.0% | → |
| 2023-02-03 | Zachary Jennifer | EVP, General Counsel | Sale+OE | 75,436 | $103.17 | $7,782,762.29 | -58.3% | → |
| 2023-01-09 | Chattopadhyay Sanat | Exe V-P & Pres. MMD | Sale+OE | 48,396 | $113.53 | $5,494,256.71 | -19.2% | → |