MRK insider buying and SEC filings, explained
Merck & Co., Inc. · CIK 310158
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$0
Insiders who bought
0
Sold (not marked 10b5-1)
$40.9M
Planned sales (10b5-1)
$0
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Aug 13, 2026 | Sale | Chirfi Guindo (EVP, Access, Policy & Comms) sold 10,000 shares at $135.00 ($1.4M). Holdings down 21% to 36,613 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 13, 2026 |
| Aug 12, 2026 | Sale | Jennifer Zachary (EVP, General Counsel) sold 80,315 shares at about $133.46 ($10.7M). Holdings down 64% to 45,509 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 13, 2026 |
| Aug 10–12, 2026 | Sale | Richard R. DeLuca (EVP&Pres, Merck Animal Heallth) sold 45,320 shares between Aug 10 and Aug 12 at about $131.12 ($5.9M). Holdings down 29% to 110,167 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 12, 2026 |
| Aug 6, 2026 | Sale | Richard R. DeLuca (EVP&Pres, Merck Animal Heallth) sold 6,050 shares at about $130.37 ($789K). Holdings down 4% to 155,487 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 10, 2026 |
| Aug 6, 2026 | Sale | Chirfi Guindo (EVP, Access, Policy & Comms) sold 15,000 shares at $131.00 ($2.0M). Holdings down 24% to 46,613 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 7, 2026 |
| Feb 12, 2026 | Sale | Chirfi Guindo (Chief Marketing Officer) sold 10,000 shares at about $121.46 ($1.2M). Holdings down 14% to 60,615 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 12, 2026 |
| Feb 10, 2026 | Sale | Dean Y Li (President / COO) sold 10,235 shares at about $117.52 ($1.2M). Holdings down 10% to 92,035 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 10, 2026 |
| Feb 9, 2026 | Sale | Chirfi Guindo (Chief Marketing Officer) sold 10,000 shares at about $118.41 ($1.2M). Holdings down 12% to 70,615 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 9, 2026 |
| Feb 6, 2026 | Sale | Johannes Jacobus Oosthuizen (President / COO) sold 15,000 shares at about $121.87 ($1.8M). Holdings down 41% to 21,197 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 6, 2026 |
| Feb 6, 2026 | Sale | Richard R. DeLuca (EVP&Pres, Merck Animal Heallth) sold 37,685 shares at about $120.92 ($4.6M). Holdings down 19% to 160,174 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 6, 2026 |
| Feb 5, 2026 | Sale | Chirfi Guindo (Chief Marketing Officer) sold 20,000 shares at about $121.88 ($2.4M). Holdings down 20% to 80,615 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 6, 2026 |
| Feb 4, 2026 | Sale | Dalton E. Smart III (SVP Fin. - Global Controller) sold 6,400 shares at $119.68 ($766K). Holdings down 44% to 8,205 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 6, 2026 |
| Feb 4, 2026 | Sale | Robert M Davis (CEO and Director) sold 47,434 shares at about $118.04 ($5.6M). Holdings down 10% to 443,602 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Feb 6, 2026 |
| Nov 10, 2025 | Sale | Cristal N Downing (Chief Comm. & Public Afrs Ofcr) sold 7,085 shares at $87.00 ($616K). Holdings down 100% to 0 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 12, 2025 |
| Nov 3, 2025 | Sale | David Michael Williams (EVP,Chief Info&Digital Officer) sold 8,614 shares at about $83.59 ($720K). Holdings down 26% to 24,578 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 4, 2025 |
75 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
Follow MRK in the Insider Ledger app
Get the appA plain-English brief of insider purchases, 8-Ks and red flags at the companies you pick. No account needed.