As of the latest Form 4 filed May 1, 2026.
What Merck & Company Inc insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 53 most recent filings for MRK.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-05-01 | 2026-04-30 | Smart Dalton E. III SVP Fin. - Global Controller | FTax | −159.00 | $110.95 | $17.6K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-30 | Smart Dalton E. III, SVP Fin. - Global Controller | MExercise | +464.00 | $110.95 | $51.5K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-30 | Larson Betty D EVP, Chief HR Officer | FTax | −5.14K | $110.95 | $571K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-30 | Larson Betty D, EVP, Chief HR Officer | MExercise | +11.3K | $110.95 | $1.26M | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Guindo Chirfi EVP, Access, Policy & Comms | FTax | −969.00 | $110.03 | $107K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Guindo Chirfi, EVP, Access, Policy & Comms | MExercise | +1.97K | $110.03 | $216K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Chattopadhyay Sanat Exe V-P & Pres. MMD | FTax | −1.13K | $110.03 | $124K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Chattopadhyay Sanat, Exe V-P & Pres. MMD | MExercise | +2.60K | $110.03 | $286K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | DeLuca Richard R. EVP&Pres, Merck Animal Heallth | FTax | −1.24K | $110.03 | $137K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | DeLuca Richard R., EVP&Pres, Merck Animal Heallth | MExercise | +2.52K | $110.03 | $277K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Williams David Michael EVP,Chief Info&Digital Officer | FTax | −679.00 | $110.03 | $74.7K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Williams David Michael, EVP,Chief Info&Digital Officer | MExercise | +1.38K | $110.03 | $152K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Smart Dalton E. III SVP Fin. - Global Controller | FTax | −324.00 | $110.03 | $35.6K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Smart Dalton E. III, SVP Fin. - Global Controller | MExercise | +944.00 | $110.03 | $104K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Li Dean Y Executive VP & President, MRL | FTax | −2.33K | $110.03 | $256K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Li Dean Y, Executive VP & President, MRL | MExercise | +4.72K | $110.03 | $520K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Zachary Jennifer EVP, General Counsel | FTax | −1.45K | $110.03 | $160K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Zachary Jennifer, EVP, General Counsel | MExercise | +2.95K | $110.03 | $325K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Larson Betty D EVP, Chief HR Officer | FTax | −715.00 | $110.03 | $78.7K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Larson Betty D, EVP, Chief HR Officer | MExercise | +2.08K | $110.03 | $229K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Litchfield Caroline EVP & CFO | FTax | −1.94K | $110.03 | $213K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Litchfield Caroline, EVP & CFO | MExercise | +3.94K | $110.03 | $433K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Davis Robert M Chairman, CEO & President | FTax | −6.55K | $110.03 | $721K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Davis Robert M, Chairman, CEO & President | MExercise | +13.3K | $110.03 | $1.46M | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Oosthuizen Johannes Jacobus EVP, Oncology & Int?l | FTax | −679.00 | $110.03 | $74.7K | No | Form 4 ↗ |
| 2026-05-01 | 2026-04-29 | Oosthuizen Johannes Jacobus, EVP, Oncology & Int?l | MExercise | +1.38K | $110.03 | $152K | No | Form 4 ↗ |
| 2026-02-12 | 2026-02-12 | Guindo Chirfi Chief Marketing Officer | SSale | −10.0K | $121.46 | $1.21M | No | Form 4 ↗ |
| 2026-02-10 | 2026-02-10 | Li Dean Y Executive VP & President, MRL | SSale | −10.2K | $117.52 | $1.20M | No | Form 4 ↗ |
| 2026-02-09 | 2026-02-09 | Guindo Chirfi Chief Marketing Officer | SSale | −10.0K | $118.41 | $1.18M | No | Form 4 ↗ |
| 2026-02-09 | 2026-02-09 | Zachary Jennifer EVP, General Counsel | SSale | −38.8K | $119.15 | $4.63M | No | Form 4 ↗ |
| 2026-02-09 | 2026-02-09 | Zachary Jennifer, EVP, General Counsel | MExercise | +38.8K | $119.15 | $4.63M | No | Form 4 ↗ |
| 2026-02-09 | 2026-02-09 | Zachary Jennifer, EVP, General Counsel | SSale | −56.8K | $119.15 | $6.77M | No | Form 4 ↗ |
| 2026-02-09 | 2026-02-09 | Zachary Jennifer, EVP, General Counsel | MExercise | +56.8K | $119.15 | $6.77M | No | Form 4 ↗ |
| 2026-02-09 | 2026-02-09 | Zachary Jennifer, EVP, General Counsel | SSale | −25.9K | $119.15 | $3.09M | No | Form 4 ↗ |
| 2026-02-09 | 2026-02-09 | Zachary Jennifer, EVP, General Counsel | MExercise | +25.9K | $119.15 | $3.09M | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-06 | Williams David Michael EVP,Chief Info&Digital Officer | SSale | −5.00K | $121.91 | $610K | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-06 | Williams David Michael, EVP,Chief Info&Digital Officer | MExercise | +5.00K | $77.62 | $388K | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-06 | Oosthuizen Johannes Jacobus President, U.S. Market | SSale | −15.0K | $121.87 | $1.83M | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-06 | DeLuca Richard R. EVP&Pres, Merck Animal Heallth | SSale | −37.7K | $120.92 | $4.56M | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-05 | Guindo Chirfi Chief Marketing Officer | SSale | −20.0K | $121.88 | $2.44M | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-04 | Smart Dalton E. III SVP Fin. - Global Controller | SSale | −2.40K | $119.68 | $287K | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-04 | Smart Dalton E. III, SVP Fin. - Global Controller | SSale | −4.00K | $119.68 | $479K | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-04 | Smart Dalton E. III, SVP Fin. - Global Controller | MExercise | +4.00K | $62.07 | $248K | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-04 | Litchfield Caroline EVP & CFO | SSale | −42.0K | $119.61 | $5.02M | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-04 | Litchfield Caroline, EVP & CFO | MExercise | +42.0K | $53.06 | $2.23M | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-04 | Li Dean Y Executive VP & President, MRL | SSale | −15.1K | $118.77 | $1.79M | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-04 | Li Dean Y, Executive VP & President, MRL | MExercise | +15.1K | $56.04 | $845K | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-04 | Davis Robert M Chairman, CEO & President | SSale | −32.5K | $118.35 | $3.84M | No | Form 4 ↗ |
| 2026-02-06 | 2026-02-04 | Davis Robert M, Chairman, CEO & President | SSale | −15.0K | $117.38 | $1.76M | No | Form 4 ↗ |
| 2024-05-02 | 2024-05-02 | Romanelli Joseph President, Human Health Int?l | FTax | −1.11K | $128.80 | $144K | No | Form 4 ↗ |
| 2024-05-02 | 2024-05-02 | Romanelli Joseph, President, Human Health Int?l | MExercise | +2.26K | $128.80 | $291K | No | Form 4 ↗ |
| 2024-05-02 | 2024-05-02 | Smart Dalton SVP Fin. - Global Controller | FTax | −131.00 | $128.80 | $16.9K | No | Form 4 ↗ |
| 2024-05-02 | 2024-05-02 | Smart Dalton, SVP Fin. - Global Controller | MExercise | +381.00 | $128.80 | $49.1K | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also MRK’s full analysis or the market-wide insider trading feed. The tabs above jump to MRK’s other SEC data.
Source: SEC Form 4 filings for MRK, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.