🕵️ Merck & Co., Inc. ($MRK)
SEC insider & ownership activity, last 12 months · CIK 310158 · every row links its SEC filing
Over the last 12 months insiders sold $72.0M with no open-market buying against it. Zachary Jennifer sold $25.2M (Feb–Aug). 2 planned sales are pending, the largest $1.7M (Richard Robert Deluca Jr.). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 11 sellers, $72.0M (35 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Zachary Jennifer | 0 | – | 4 | $25.2M | Aug 12, 2026 |
| Richard Robert Deluca Jr. | 0 | – | 9 | $11.3M | Aug 12, 2026 |
| Guindo Chirfi | 0 | – | 5 | $8.2M | Aug 13, 2026 |
| David Williams | 0 | – | 5 | $8.1M | Aug 5, 2026 |
| Robert M. Davis | 0 | – | 2 | $5.6M | Feb 4, 2026 |
| Caroline A. Litchfield | 0 | – | 1 | $5.0M | Feb 4, 2026 |
| Dean Y. Li | 0 | – | 2 | $3.0M | Feb 10, 2026 |
| David R. Maraldo | 0 | – | 3 | $2.4M | Aug 5, 2026 |
| Johannes Jacobus Oosthuizen | 0 | – | 1 | $1.8M | Feb 6, 2026 |
| Dalton Smart | 0 | – | 2 | $766K | Feb 4, 2026 |
| Cristal Downing | 0 | – | 1 | $616K | Nov 10, 2025 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Vanguard Capital Management | 7.5% | 13G | Apr 30, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Chirfi Guindo | $1.4M | Aug 13, 2026 | filing ↗ |
| Richard Robert Deluca Jr. | $1.5M | Aug 12, 2026 | filing ↗ |
| Jennifer L. Zachary | $10.7M | Aug 12, 2026 | filing ↗ |
| Richard Robert Deluca Jr. | $1.7M | Aug 11, 2026 | filing ↗ |
| Richard Robert Deluca Jr. | $2.7M | Aug 10, 2026 | filing ↗ |
| Chirfi Guindo | $2.0M | Aug 6, 2026 | filing ↗ |
| Richard Robert Deluca Jr. | $789K | Aug 6, 2026 | filing ↗ |
| David M. Williams | $6.8M | Aug 5, 2026 | filing ↗ |
| David Maraldo | $2.4M | Aug 5, 2026 | filing ↗ |
| Dean Li | $1.2M | Feb 10, 2026 | filing ↗ |
| Chirfi Guindo | $2.4M | Feb 9, 2026 | filing ↗ |
| Jennifer Zachary | $14.5M | Feb 9, 2026 | filing ↗ |
| Richard Robert Deluca Jr. | $4.6M | Feb 6, 2026 | filing ↗ |
| David Williams | $610K | Feb 6, 2026 | filing ↗ |
| Johannes Jacobus Oosthuizen | $1.8M | Feb 6, 2026 | filing ↗ |
| Chirfi Guindo | $2.4M | Feb 5, 2026 | filing ↗ |
| Dalton Smart | $766K | Feb 4, 2026 | filing ↗ |
| Robert M. Davis | $5.6M | Feb 4, 2026 | filing ↗ |
| Dean Li | $1.8M | Feb 4, 2026 | filing ↗ |
| Caroline A. Litchfield | $5.0M | Feb 4, 2026 | filing ↗ |
| Cristal Downing | $616K | Nov 10, 2025 | filing ↗ |
| David Williams | $720K | Nov 3, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Earnings (2.02) | Aug 4, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 4, 2026 | filing ↗ |
| Shareholder vote (5.07) | May 26, 2026 | filing ↗ |
| Other events (8.01) | May 22, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 22, 2026 | filing ↗ |
| Earnings (2.02) | Apr 30, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Apr 30, 2026 | filing ↗ |
| Earnings (2.02) | Feb 3, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 3, 2026 | filing ↗ |
| Other events (8.01) | Dec 4, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 4, 2025 | filing ↗ |
| Earnings (2.02) | Oct 30, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Oct 30, 2025 | filing ↗ |