Merck & Co., Inc. (MRK) Insider Trading
Directors, officers and holders of more than 10% of MRK report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.
Recent Form 4 transactions
The 50 most recent of 275 transactions on file: 0 with code P, 17 with code S and 33 with other codes.
| Date | Insider | Title | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Nov 1, 2026 | DIAZ PAUL J | Director | A Award | 613 | $149.52 | $91,667 |
| Sep 30, 2026 | Karsanbhai Surendralal Lanca | Director | A Award | 112 | $145.31 | $16,250 |
| Sep 30, 2026 | Seidman Christine E | Director | A Award | 56 | $145.31 | $8,125 |
| Sep 30, 2026 | Coe Mary Ellen | Director | A Award | 206 | $145.31 | $30,000 |
| Aug 13, 2026 | Guindo Chirfi | EVP, Access, Policy & Comms | S Sale | 10,000 | $135.00 | $1,350,000 |
| Aug 12, 2026 | Zachary Jennifer | EVP, General Counsel | M Exercise | 13,433 | $84.71 | $1,137,909 |
| Aug 12, 2026 | Zachary Jennifer | EVP, General Counsel | M Exercise | 41,494 | $117.89 | $4,891,728 |
| Aug 12, 2026 | Zachary Jennifer | EVP, General Counsel | M Exercise | 13,433 | Not measured | Not measured |
| Aug 12, 2026 | Zachary Jennifer | EVP, General Counsel | M Exercise | 41,494 | Not measured | Not measured |
| Aug 12, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | S Sale | 11,099 | $131.61 | $1,460,770 |
| Aug 12, 2026 | Zachary Jennifer | EVP, General Counsel | S Sale | 80,315 | $133.46 | $10,718,495 |
| Aug 12, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | S Sale | 600 | $132.04 | $79,222 |
| Aug 11, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | S Sale | 5,427 | $132.35 | $718,261 |
| Aug 11, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | S Sale | 7,410 | $131.33 | $973,165 |
| Aug 10, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | S Sale | 20,784 | $130.43 | $2,710,951 |
| Aug 6, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | S Sale | 300 | $131.02 | $39,307 |
| Aug 6, 2026 | Guindo Chirfi | EVP, Access, Policy & Comms | S Sale | 15,000 | $131.00 | $1,965,000 |
| Aug 6, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | S Sale | 4,945 | $130.23 | $643,993 |
| Aug 6, 2026 | DeLuca Richard R. | EVP&Pres, Merck Animal Heallth | S Sale | 805 | $131.02 | $105,472 |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | M Exercise | 34,705 | Not measured | Not measured |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | M Exercise | 34,705 | $73.73 | $2,558,800 |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | S Sale | 6,311 | $128.72 | $812,339 |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | S Sale | 13,542 | $128.77 | $1,743,813 |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | S Sale | 2,686 | $128.72 | $345,736 |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | S Sale | 9,709 | $128.72 | $1,249,722 |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | M Exercise | 9,709 | $87.10 | $845,654 |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | S Sale | 34,705 | $128.77 | $4,468,987 |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | M Exercise | 4,600 | $77.62 | $357,052 |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | M Exercise | 4,600 | Not measured | Not measured |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | M Exercise | 13,542 | Not measured | Not measured |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | M Exercise | 6,311 | Not measured | Not measured |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | M Exercise | 9,709 | Not measured | Not measured |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | M Exercise | 6,311 | $73.73 | $465,310 |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | S Sale | 4,600 | $128.77 | $592,345 |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | M Exercise | 2,686 | $84.71 | $227,531 |
| Aug 5, 2026 | Maraldo David R. | EVP & Pres. MMD | M Exercise | 2,686 | Not measured | Not measured |
| Aug 5, 2026 | Williams David Michael | EVP,Chief Info&Digital Officer | M Exercise | 13,542 | $75.36 | $1,020,525 |
| Jun 30, 2026 | Coe Mary Ellen | Director | A Award | 233 | $128.50 | $30,000 |
| Jun 30, 2026 | Karsanbhai Surendralal Lanca | Director | A Award | 126 | $128.50 | $16,250 |
| Jun 30, 2026 | Seidman Christine E | Director | A Award | 63 | $128.50 | $8,125 |
| May 29, 2026 | THULIN INGE G | Director | A Award | 1,853 | $118.72 | $220,000 |
| May 29, 2026 | Seidman Christine E | Director | A Award | 1,853 | $118.72 | $220,000 |
| May 29, 2026 | Karsanbhai Surendralal Lanca | Director | A Award | 1,853 | $118.72 | $220,000 |
| May 29, 2026 | RUSSO PATRICIA F | Director | A Award | 1,853 | $118.72 | $220,000 |
| May 29, 2026 | Warden Kathy J | Director | A Award | 1,853 | $118.72 | $220,000 |
| May 29, 2026 | Mayo Stephen | Director | A Award | 1,853 | $118.72 | $220,000 |
| May 29, 2026 | Craig Pamela J. | Director | A Award | 1,853 | $118.72 | $220,000 |
| May 29, 2026 | BAKER DOUGLAS M JR | Director | A Award | 1,853 | $118.72 | $220,000 |
| May 29, 2026 | GLOCER THOMAS H | Director | A Award | 1,853 | $118.72 | $220,000 |
| May 29, 2026 | Coe Mary Ellen | Director | A Award | 1,853 | $118.72 | $220,000 |
The full Form 4 history is on the MRK company page (Insider Trades card, View all).
Questions about this data
Which insider transactions are open-market trades?
Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.
How quickly are insider trades reported?
A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.
Who has to file Form 4?
Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.
Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.