MRK insider trading — Merck & Co., Inc.
Over the last 90 days, insiders at Merck & Co., Inc. (MRK) made 0 open-market purchases worth $0 and 9 open-market sales worth $29.98M, making them net sellers by $29.98M. The largest sale was by Zachary Jennifer (EVP, General Counsel), who sold 80,315 shares for $10.72M on Aug 12, 2026.
Updated Oct 16, 2026.
Recent MRK insider transactions
Every Form 4 filed by Merck & Co., Inc. officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.
| Trade date | Insider | Role | Type | Ownership | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| Aug 13, 2026 | Guindo Chirfi | EVP, Access, Policy & Comms | S · Sale | Direct | 10,000 | $135.00 | $1.35M | Form 4 |
| Aug 12, 2026 | Zachary Jennifer | EVP, General Counsel | M · Option exercise | Direct | 54,927 | $109.78 | $6.03M | Form 4 |
| Aug 12, 2026 | Zachary Jennifer | EVP, General Counsel | S · Sale | Direct | 80,315 | $133.46 | $10.72M | Form 4 |
| Aug 12, 2026 | Deluca Richard R. | EVP&Pres, Merck Animal Heallth | S · Sale | Direct | 11,699 | $131.63 | $1.54M | Form 4 |
| Aug 11, 2026 | Deluca Richard R. | EVP&Pres, Merck Animal Heallth | S · Sale | Direct | 12,837 | $131.76 | $1.69M | Form 4 |
| Aug 10, 2026 | Deluca Richard R. | EVP&Pres, Merck Animal Heallth | S · Sale | Direct | 20,784 | $130.43 | $2.71M | Form 4 |
| Aug 6, 2026 | Deluca Richard R. | EVP&Pres, Merck Animal Heallth | S · Sale | Direct | 6,050 | $130.38 | $789K | Form 4 |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | M · Option exercise | Direct | 18,706 | $82.25 | $1.54M | Form 4 |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | S · Sale | Direct | 18,706 | $128.72 | $2.41M | Form 4 |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | M · Option exercise | Direct | 52,847 | $74.49 | $3.94M | Form 4 |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | S · Sale | Direct | 52,847 | $128.77 | $6.81M | Form 4 |
| Aug 6, 2026 | Guindo Chirfi | EVP, Access, Policy & Comms | S · Sale | Direct | 15,000 | $131.00 | $1.97M | Form 4 |
MRK insider trading FAQ
Are insiders buying MRK stock?
Not on the open market. In the last 90 days, Merck & Co., Inc. insiders made no open-market purchases, and 9 open-market sales totaling $29.98M. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).
Who are the insiders trading MRK?
Recent sellers: Deluca Richard R., Guindo Chirfi, Maraldo David R., Williams David Michael, Zachary Jennifer.
Where does MRK insider trading data come from?
Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.
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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.