Zachary Jennifer, EVP and General Counsel at Merck & Co., Inc. ($MRK), sold shares on the open market three times in the last year for a total of $14.5 million. The most recent MRK insider sale happened on February 9, 2026. These sales rank 864th out of 11,678 insiders, beating the average of $8.6 million across about six transactions. No open market purchases in the past year.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feb. 9, 2026 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | S | Common Stock | 25946 | $119.15 | 68,915.6710 | 2,514,000,000 | 27.35% | 0.00% |
| Feb. 9, 2026 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | M | Common Stock | 25946 | $119.15 | 94,861.6710 | 2,514,000,000 | 37.65% | 0.00% |
| Feb. 9, 2026 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | M | Stock Option (Right to Buy) | 38835 | $0.00 | 0.0000 | 2,514,000,000 | 100.00% | 0.00% |
| Feb. 9, 2026 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | M | Stock Option (Right to Buy) | 56792 | $0.00 | 0.0000 | 2,514,000,000 | 100.00% | 0.00% |
| Feb. 9, 2026 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | M | Stock Option (Right to Buy) | 25946 | $0.00 | 0.0000 | 2,514,000,000 | 100.00% | 0.00% |
| Feb. 9, 2026 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | S | Common Stock | 38835 | $119.15 | 68,915.6710 | 2,514,000,000 | 36.04% | 0.00% |
| Feb. 9, 2026 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | M | Common Stock | 38835 | $119.15 | 107,750.6710 | 2,514,000,000 | 56.35% | 0.00% |
| Feb. 9, 2026 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | S | Common Stock | 56792 | $119.15 | 68,915.6710 | 2,514,000,000 | 45.18% | 0.00% |
| Feb. 9, 2026 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | M | Common Stock | 56792 | $119.15 | 125,707.6710 | 2,514,000,000 | 82.41% | 0.00% |
| Jan. 26, 2026 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | A | Common Stock | 11583 | $107.40 | 68,915.6710 | 2,514,000,000 | 20.20% | 0.00% |
| May 30, 2025 | REGENXBIO Inc. | $RGNX | Zachary Jennifer | Not found | A | Common Stock | 7768 | $0.00 | 22,064.0000 | 49,509,000 | 54.34% | 0.02% |
| May 30, 2025 | REGENXBIO Inc. | $RGNX | Zachary Jennifer | Not found | A | Stock Options (Right to Buy) | 39815 | $0.00 | 39,815.0000 | 49,509,000 | 9999.99% | 0.08% |
| April 29, 2025 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | A | Restricted Stock Unit | 8854 | $0.00 | 8,854.0000 | 2,541,000,000 | 9999.99% | 0.00% |
| April 29, 2025 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | A | Stock Option (Right to Buy) | 40301 | $0.00 | 40,301.0000 | 2,541,000,000 | 9999.99% | 0.00% |
| Jan. 27, 2025 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | A | Common Stock | 25423 | $97.94 | 55,285.6850 | 2,541,000,000 | 85.13% | 0.00% |
| May 31, 2024 | REGENXBIO Inc. | $RGNX | Zachary Jennifer | Not found | A | Common Stock | 4790 | $0.00 | 14,296.0000 | 43,734,000 | 50.39% | 0.01% |
| May 31, 2024 | REGENXBIO Inc. | $RGNX | Zachary Jennifer | Not found | A | Stock Options (Right to Buy) | 24454 | $0.00 | 24,454.0000 | 43,734,000 | 9999.99% | 0.06% |
| April 30, 2024 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | A | Stock Option (Right to Buy) | 35156 | $0.00 | 35,156.0000 | 2,547,000,000 | 9999.99% | 0.00% |
| Feb. 2, 2024 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | S | Common Stock | 49499 | $126.97 | 29,057.7600 | 2,547,000,000 | 63.01% | 0.00% |
| Feb. 2, 2024 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | M | Stock Option (Right to Buy) | 19417 | $0.00 | 38,835.0000 | 2,547,000,000 | 33.33% | 0.00% |
| Feb. 2, 2024 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | M | Common Stock | 19417 | $87.10 | 78,556.7600 | 2,547,000,000 | 32.83% | 0.00% |
| Jan. 22, 2024 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | A | Common Stock | 23298 | $119.43 | 59,139.7600 | 2,547,000,000 | 65.00% | 0.00% |
| May 4, 2023 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | S | Common Stock | 19141 | $117.59 | 35,127.5930 | 2,542,000,000 | 35.27% | 0.00% |
| May 2, 2023 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | A | Stock Option (Right to Buy) | 41494 | $0.00 | 41,494.0000 | 2,542,000,000 | 9999.99% | 0.00% |
| Feb. 3, 2023 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | M | Stock Option (Right to Buy) | 75436 | $0.00 | 0.0000 | 2,542,000,000 | 100.00% | 0.00% |
| Feb. 3, 2023 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | S | Common Stock | 75436 | $103.17 | 53,919.9410 | 2,542,000,000 | 58.32% | 0.00% |
| Feb. 3, 2023 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | M | Common Stock | 75436 | $56.04 | 129,355.9410 | 2,542,000,000 | 139.90% | 0.00% |
| Jan. 23, 2023 | Merck & Co., Inc. | $MRK | Zachary Jennifer | EVP, General Counsel | A | Common Stock | 15631 | $109.88 | 53,919.9410 | 2,542,000,000 | 40.82% | 0.00% |