MRK
Merck & Co. insider trading
Health Care · Heavy selling
Close · Oct 5, 2026
$139.54
+61.8% over 12 months
Share price and insider trades
MRK closeInsider buyInsider sale
Bought, 12 months$0
Sold, 12 months$72.0M
Insiders buying0
Insiders selling11
Valuation, profit and volume
P/E (trailing)110.7Sector median 24.5
Market value$344.27BDrug Manufacturers - General
Profit margin4.8%Revenue growth +5.1%
Volume vs. 50-day0.9×Last 5 sessions
Insiders' paper profit—On all tracked purchases —
Summary
Over the past 12 months, 0 Merck & Co. insiders reported open-market purchases totaling $0, while 11 insiders reported sales totaling $72.0M. 0 of 35 recorded sales were made under pre-scheduled Rule 10b5-1 trading plans, which are usually less informative than discretionary sales.
Insider transactions
Open-market purchases and sales. 56 grants, option exercises and tax withholdings are not shown.
| Filed | Insider | Type | Shares | Price | Value | Since | Score |
|---|---|---|---|---|---|---|---|
| Aug 13SEC | Jennifer ZacharyGeneral Counsel | Sell | 80,315 | $133.46 | $10.7M | +4.6% | — |
| Aug 13SEC | Chirfi GuindoEvp, Access, Policy & Comms | Sell | 10,000 | $135.00 | $1.4M | +3.4% | — |
| Aug 12SEC | Richard R. DelucaEvp&Pres, Merck Animal Heallth | Sell | 20,784 | $130.43 | $2.7M | +7.0% | — |
| Aug 12SEC | Richard R. DelucaEvp&Pres, Merck Animal Heallth | Sell | 11,099 | $131.61 | $1.5M | +6.0% | — |
| Aug 12SEC | Richard R. DelucaEvp&Pres, Merck Animal Heallth | Sell | 7,410 | $131.33 | $973K | +6.3% | — |
| Aug 12SEC | Richard R. DelucaEvp&Pres, Merck Animal Heallth | Sell | 5,427 | $132.35 | $718K | +5.4% | — |
| Aug 12SEC | Richard R. DelucaEvp&Pres, Merck Animal Heallth | Sell | 600 | $132.04 | $79K | +5.7% | — |
| Aug 10SEC | Richard R. DelucaEvp&Pres, Merck Animal Heallth | Sell | 4,945 | $130.23 | $644K | +7.1% | — |
| Aug 10SEC | Richard R. DelucaEvp&Pres, Merck Animal Heallth | Sell | 805 | $131.02 | $105K | +6.5% | — |
| Aug 10SEC | Richard R. DelucaEvp&Pres, Merck Animal Heallth | Sell | 300 | $131.02 | $39K | +6.5% | — |
| Aug 7SEC | David Michael WilliamsEvp,Chief Info&Digital Officer | Sell | 34,705 | $128.77 | $4.5M | +8.4% | — |
| Aug 7SEC | Chirfi GuindoEvp, Access, Policy & Comms | Sell | 15,000 | $131.00 | $2.0M | +6.5% | — |
| Aug 7SEC | David Michael WilliamsEvp,Chief Info&Digital Officer | Sell | 13,542 | $128.77 | $1.7M | +8.4% | — |
| Aug 7SEC | David R. MaraldoEvp & Pres. Mmd | Sell | 9,709 | $128.72 | $1.2M | +8.4% | — |
| Aug 7SEC | David R. MaraldoEvp & Pres. Mmd | Sell | 6,311 | $128.72 | $812K | +8.4% | — |
| Aug 7SEC | David Michael WilliamsEvp,Chief Info&Digital Officer | Sell | 4,600 | $128.77 | $592K | +8.4% | — |
| Aug 7SEC | David R. MaraldoEvp & Pres. Mmd | Sell | 2,686 | $128.72 | $346K | +8.4% | — |
| Feb 12SEC | Chirfi GuindoChief Marketing Officer | Sell | 10,000 | $121.46 | $1.2M | +14.9% | — |
| Feb 10SEC | Dean Y LiPresident | Sell | 10,235 | $117.52 | $1.2M | +18.7% | — |
| Feb 9SEC | Jennifer ZacharyGeneral Counsel | Sell | 56,792 | $119.15 | $6.8M | +17.1% | — |
| Feb 9SEC | Jennifer ZacharyGeneral Counsel | Sell | 38,835 | $119.15 | $4.6M | +17.1% | — |
| Feb 9SEC | Jennifer ZacharyGeneral Counsel | Sell | 25,946 | $119.15 | $3.1M | +17.1% | — |
| Feb 9SEC | Chirfi GuindoChief Marketing Officer | Sell | 10,000 | $118.41 | $1.2M | +17.8% | — |
| Feb 6SEC | Caroline LitchfieldCFO | Sell | 41,997 | $119.61 | $5.0M | +16.7% | — |
| Feb 6SEC | Richard R. DelucaEvp&Pres, Merck Animal Heallth | Sell | 37,685 | $120.92 | $4.6M | +15.4% | — |
| Feb 6SEC | Robert M DavisCEO, President | Sell | 32,462 | $118.35 | $3.8M | +17.9% | — |
| Feb 6SEC | Chirfi GuindoChief Marketing Officer | Sell | 20,000 | $121.88 | $2.4M | +14.5% | — |
| Feb 6SEC | Johannes Jacobus OosthuizenPresident | Sell | 15,000 | $121.87 | $1.8M | +14.5% | — |
| Feb 6SEC | Dean Y LiPresident | Sell | 15,087 | $118.77 | $1.8M | +17.5% | — |
| Feb 6SEC | Robert M DavisCEO, President | Sell | 14,972 | $117.38 | $1.8M | +18.9% | — |
| Feb 6SEC | David Michael WilliamsEvp,Chief Info&Digital Officer | Sell | 5,000 | $121.91 | $610K | +14.5% | — |
| Feb 6SEC | Dalton E. Smart IIISvp Fin. - Global Controller | Sell | 4,000 | $119.67 | $479K | +16.6% | — |
| Feb 6SEC | Dalton E. Smart IIISvp Fin. - Global Controller | Sell | 2,400 | $119.67 | $287K | +16.6% | — |
| Nov 12SEC | Cristal N DowningChief Comm. & Public Afrs Ofcr | Sell | 7,085 | $87.00 | $616K | +60.4% | — |
| Nov 4SEC | David Michael WilliamsEvp,Chief Info&Digital Officer | Sell | 8,614 | $83.59 | $720K | +66.9% | — |
Insiders at Merck & Co.
| Insider | Bought | Sold | Last filing | Score |
|---|---|---|---|---|
| Jennifer ZacharyGeneral Counsel | — | $25.2M | Aug 13, 2026 | — |
| Richard R. DelucaEvp&Pres, Merck Animal Heallth | — | $11.3M | Aug 12, 2026 | — |
| Chirfi GuindoEvp, Access, Policy & Comms | — | $8.2M | Aug 13, 2026 | — |
| David Michael WilliamsEvp,Chief Info&Digital Officer | — | $8.1M | Aug 7, 2026 | — |
| Robert M DavisCEO, President | — | $5.6M | May 1, 2026 | — |
| Caroline LitchfieldCFO | — | $5.0M | May 1, 2026 | — |
| Dean Y LiPresident | — | $3.0M | May 1, 2026 | — |
| David R. MaraldoEvp & Pres. Mmd | — | $2.4M | Aug 7, 2026 | — |
| Johannes Jacobus OosthuizenEvp, Oncology & Int?L | — | $1.8M | May 1, 2026 | — |
| Dalton E. Smart IIISvp Fin. - Global Controller | — | $766K | May 5, 2026 | — |
| Cristal N DowningChief Comm. & Public Afrs Ofcr | — | $616K | Nov 12, 2025 | — |
| Betty D LarsonEvp, Chief Hr Officer | — | — | May 1, 2026 | — |
| Sanat ChattopadhyayExe V-P & Pres. Mmd | — | — | May 1, 2026 | — |
| Joseph RomanelliPresident | — | — | Jan 28, 2026 | — |
Insider activity at other Health Care companies
Same sector, ranked by insider buying in the last 90 days.
Common questions about MRK insiders
Are Merck & Co. insiders buying MRK stock?
In the past 12 months, 0 insiders reported open-market purchases of MRK worth $0.
Are Merck & Co. insiders selling MRK stock?
11 insiders reported sales worth $72.0M over the same period.
Where does this data come from?
Every transaction comes from Form 4 filings that insiders must submit to the SEC within two business days of a trade. We pull them from SEC EDGAR every night.