MRK's three largest insider shareholders as of September 09, 2026 are Kenneth C Frazier (Executive Chair, 700.65K shares), Robert M Davis (Chairman, Ceo President, 450.35K shares), Richard R. Deluca (Evppres, Merck Animal Heallth, 155.49K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Kenneth C Frazier | Executive Chair | 700,653 | 0 | 700,653 | 37.0% | 08 Nov, 2022 |
| 2 | Robert M Davis | Chairman, Ceo President | 450,351 | 0 | 450,351 | 23.8% | 01 May, 2026 |
| 3 | Richard R. Deluca | Evppres, Merck Animal Heallth | 155,487 | 0 | 155,487 | 8.2% | 10 Aug, 2026 |
| 4 | Frank Clyburn | Evp Pres ? Human Health | 97,095 | 0 | 97,095 | 5.1% | 02 Nov, 2021 |
| 5 | Dean Y Li | Executive Vp President, Mrl | 94,431 | 0 | 94,431 | 5.0% | 01 May, 2026 |
| 6 | Caroline Litchfield | Evp Cfo | 90,192 | 0 | 90,192 | 4.8% | 06 Feb, 2026 |
| 7 | Julie L. Gerberding | Evp, Chief Patient Officer | 48,712 | 0 | 48,712 | 2.6% | 28 Feb, 2022 |
| 8 | Rita A Karachun | Sr. Vp Fince Global Controller | 45,710 | 0 | 45,710 | 2.4% | 05 May, 2023 |
| 9 | Chirfi Guindo | Evp, Access, Policy Comms | 36,613 | 0 | 36,613 | 1.9% | 13 Aug, 2026 |
| 10 | Joseph Romanelli | President, Human Health Int?L | 28,739 | 0 | 28,739 | 1.5% | 28 Jan, 2026 |
| 11 | Michael A Klobuchar | Evp Chief Strategy Officer | 23,621 | 0 | 23,621 | 1.2% | 06 May, 2024 |
| 12 | Steven Mizell | Evp, Chief Hr Officer | 23,619 | 0 | 23,619 | 1.2% | 02 Feb, 2024 |
| 13 | Johannes Jacobus Oosthuizen | Evp, Oncology Int?L | 21,895 | 0 | 21,895 | 1.2% | 01 May, 2026 |
| 14 | David R. Maraldo | Evp Pres. Mmd | 18,212 | 0 | 18,212 | 1.0% | 07 Aug, 2026 |
| 15 | Douglas M Jr Baker | Director | 16,000 | 0 | 16,000 | 0.8% | 07 Feb, 2025 |
| 16 | Sanat Chattopadhyay | Exe V P Pres. Mmd | 13,880 | 0 | 13,880 | 0.7% | 28 Jan, 2026 |
| 17 | Betty D Larson | Evp, Chief Hr Officer | 13,774 | 0 | 13,774 | 0.7% | 01 May, 2026 |
| 18 | Dalton E. Iii Smart | Svp Fin. Global Controller | 9,388 | 0 | 9,388 | 0.5% | 05 May, 2026 |
| 19 | Lisa Lecointe-Cephas | Svp Chief Ethics Com Officer | 5,142 | 0 | 5,142 | 0.3% | 05 May, 2023 |
| 20 | Arpa Garay | Svp Human Health Global Mktg. | 2,109 | 0 | 2,109 | 0.1% | 05 May, 2022 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 13 Aug, 2026 | Chirfi Guindo | Evp, Access, Policy Comms | Disposed S | 10,000 | $135.00 | $1.35Mn | 36,613 | Direct |
| 06 Aug, 2026 | Richard R. Deluca | Evppres, Merck Animal Heallth | Disposed S | 805 | $131.02 | $105.47K | 160,732 | Direct |
| 06 Aug, 2026 | Richard R. Deluca | Evppres, Merck Animal Heallth | Disposed S | 4,945 | $130.23 | $643.99K | 155,787 | Direct |
| 06 Aug, 2026 | Richard R. Deluca | Evppres, Merck Animal Heallth | Disposed S | 300 | $131.02 | $39.31K | 155,487 | Direct |
| 05 Aug, 2026 | David R. Maraldo | Evp Pres. Mmd | Acquired M | 6,311 | $73.73 | $465.31K | 24,523 | Direct |
| 06 Aug, 2026 | Chirfi Guindo | Evp, Access, Policy Comms | Disposed S | 15,000 | $131.00 | $1.97Mn | 46,613 | Direct |
| 05 Aug, 2026 | David R. Maraldo | Evp Pres. Mmd | Disposed S | 6,311 | $128.72 | $812.34K | 18,212 | Direct |
| 05 Aug, 2026 | David R. Maraldo | Evp Pres. Mmd | Acquired M | 9,709 | $87.10 | $845.65K | 27,921 | Direct |
| 05 Aug, 2026 | David R. Maraldo | Evp Pres. Mmd | Disposed S | 9,709 | $128.72 | $1.25Mn | 18,212 | Direct |
| 05 Aug, 2026 | David R. Maraldo | Evp Pres. Mmd | Acquired M | 2,686 | $84.71 | $227.53K | 20,898 | Direct |
| 05 Aug, 2026 | David R. Maraldo | Evp Pres. Mmd | Disposed S | 2,686 | $128.72 | $345.74K | 18,212 | Direct |
| 05 Aug, 2026 | David R. Maraldo | Evp Pres. Mmd | Disposed M | 6,311 | $0.00 | $0 | 3,154 | Direct |
| 05 Aug, 2026 | David R. Maraldo | Evp Pres. Mmd | Disposed M | 9,709 | $0.00 | $0 | 0 | Direct |
| 05 Aug, 2026 | David R. Maraldo | Evp Pres. Mmd | Disposed M | 2,686 | $0.00 | $0 | 5,374 | Direct |
| 30 Jun, 2026 | Christine E Seidman | Director | Acquired A | 63 | $128.50 | $8.13K | 21,291 | Direct |
| 30 Jun, 2026 | Mary Ellen Coe | Director | Acquired A | 233 | $128.50 | $30.00K | 31,999 | Direct |
| 30 Jun, 2026 | Surendralal Lanca Karsanbhai | Director | Acquired A | 126 | $128.50 | $16.25K | 5,519 | Direct |
| 29 May, 2026 | Stephen Mayo | Director | Acquired A | 1,853 | $118.72 | $220.00K | 14,825 | Direct |
| 29 May, 2026 | Surendralal Lanca Karsanbhai | Director | Acquired A | 1,853 | $118.72 | $220.00K | 5,392 | Direct |
| 29 May, 2026 | Paul Rothman | Director | Acquired A | 1,853 | $118.72 | $220.00K | 34,945 | Direct |