MRK Insider Trading
Merck & Co., Inc. | Pharmaceutical Preparations
Comprehensive Trading Performance Summary
The investment history of corporate insiders at Merck & Co., Inc. provides a unique lens into the internal conviction of the company's leadership. By analyzing SEC Form 4 filings, investors can track how directors and officers are allocating their own capital. High-conviction buying often signals that management believes the current market price significantly undervalues future growth prospects, while strategic selling might occur for personal liquidity or portfolio diversification. Monitoring these shifts in ownership is essential for understanding the alignment between management and shareholders in the Pharmaceutical Preparations sector.
Transactions on Chart
Open Full Chart| Filing Date | Trade Date | Reporting Person | Relationship | Type | Price | Qty | Total, $ | Owned After | Change, % |
|---|---|---|---|---|---|---|---|---|---|
| 2026-02-13 00:02 | 2026-02-12 | Guindo Chirfi | Officer - Chief Marketing Officer | SELL | $121.46 | 10,000 | $1,214,562 | 60,615 | -14.2% |
| 2026-02-11 00:04 | 2026-02-10 | Li Dean Y | Officer - Executive VP & President, MRL | SELL | $117.52 | 10,235 | $1,202,844 | 92,035 | -10.0% |
| 2026-02-10 00:01 | 2026-02-09 | Zachary Jennifer | Officer - EVP, General Counsel | OPT+S | $119.15 | 121,573 | $14,485,690 | 68,916 | 0.0% |
| 2026-02-10 00:04 | 2026-02-09 | Guindo Chirfi | Officer - Chief Marketing Officer | SELL | $118.41 | 10,000 | $1,184,101 | 70,615 | -12.4% |
| 2026-02-07 00:18 | 2026-02-04 | Smart Dalton E. III | Officer - SVP Fin. - Global Controller | OPT+S | $119.68 | 6,400 | $765,920 | 8,205 | 0.0% |
| 2026-02-07 00:15 | 2026-02-06 | Oosthuizen Johannes Jacobus | Officer - President, U.S. Market | SELL | $121.87 | 15,000 | $1,827,992 | 21,197 | -41.4% |
| 2026-02-07 00:13 | 2026-02-04 | Litchfield Caroline | Officer - EVP & CFO | OPT+S | $119.61 | 41,997 | $5,023,312 | 90,192 | 0.0% |
| 2026-02-07 00:12 | 2026-02-04 | Li Dean Y | Officer - Executive VP & President, MRL | OPT+S | $118.77 | 15,087 | $1,791,824 | 102,270 | 0.0% |
| 2026-02-07 00:20 | 2026-02-06 | Williams David Michael | Officer - EVP,Chief Info&Digital Officer | OPT+S | $121.91 | 5,000 | $609,525 | 30,838 | 0.0% |
| 2026-02-07 00:10 | 2026-02-05 | Guindo Chirfi | Officer - Chief Marketing Officer | SELL | $121.88 | 20,000 | $2,437,676 | 80,615 | -19.9% |
| 2026-02-07 00:08 | 2026-02-06 | DeLuca Richard R. | Officer - EVP&Pres, Merck Animal Heallth | SELL | $120.92 | 37,685 | $4,557,025 | 160,174 | -19.0% |
| 2026-02-07 00:05 | 2026-02-04 | Davis Robert M | Director, Officer - Chairman, CEO & President | SELL | $118.04 | 47,434 | $5,599,328 | 443,602 | -9.7% |
| 2025-11-13 00:01 | 2025-11-10 | Downing Cristal N | Officer - Chief Comm. & Public Afrs Ofcr | SELL | $87.00 | 7,085 | $616,395 | 0 | -100.0% |
| 2025-11-05 00:02 | 2025-11-03 | Williams David Michael | Officer - EVP,Chief Info&Digital Officer | SELL | $83.59 | 8,614 | $720,040 | 24,578 | -26.0% |
| 2025-04-29 23:04 | 2025-04-25 | Smart Dalton E. III | Officer - SVP Fin. - Global Controller | OPT+S | $82.76 | 4,262 | $352,723 | 7,778 | 0.0% |
| 2025-02-21 00:01 | 2025-02-19 | Oosthuizen Johannes Jacobus | Officer - President, U.S. Market | SELL | $84.09 | 8,500 | $714,745 | 30,705 | -21.7% |
| 2025-02-14 00:01 | 2025-02-13 | Williams David Michael | Officer - EVP,Chief Info&Digital Officer | SELL | $85.34 | 6,000 | $512,057 | 24,123 | -19.9% |
| 2025-02-08 00:07 | 2025-02-06 | Downing Cristal N | Officer - Chief Comm. & Public Afrs Ofcr | SELL | $88.76 | 2,361 | $209,551 | 7,085 | -25.0% |
| 2025-02-08 00:09 | 2025-02-06 | THULIN INGE G | Director | BUY | $88.25 | 2,833 | $250,000 | 2,933 | +2,832.9% |
| 2025-02-08 00:04 | 2025-02-05 | BAKER DOUGLAS M JR | Director | BUY | $88.50 | 15,000 | $1,327,500 | 16,000 | +1,500.0% |
| 2024-02-16 00:03 | 2024-02-14 | Litchfield Caroline | Officer - EVP & CFO | OPT+S | $125.50 | 38,291 | $4,805,521 | 50,908 | 0.0% |
| 2024-02-16 00:01 | 2024-02-13 | Davis Robert M | Director, Officer - Chairman, CEO & President | OPT+S | $125.69 | 235,021 | $29,538,990 | 348,327 | 0.0% |
| 2024-02-15 00:03 | 2024-02-13 | Romanelli Joseph | Officer - President, Human Health Int?l | SELL | $124.89 | 1,000 | $124,888 | 19,569 | -4.9% |
| 2024-02-13 00:03 | 2024-02-09 | Li Dean Y | Officer - Executive VP & President, MRL | OPT+S | $125.50 | 14,702 | $1,845,083 | 46,242 | 0.0% |
| 2024-02-09 00:04 | 2024-02-07 | Williams David Michael | Officer - EVP,Chief Info&Digital Officer | SELL | $127.57 | 1,451 | $185,108 | 19,812 | -6.8% |
| 2024-02-06 00:01 | 2024-02-02 | Oosthuizen Johannes Jacobus | Officer - President, U.S. Market | OPT+S | $127.18 | 18,959 | $2,411,111 | 23,327 | 0.0% |
| 2024-02-03 00:05 | 2024-02-02 | Zachary Jennifer | Officer - EVP, General Counsel | OPT+S | $126.97 | 49,499 | $6,284,779 | 29,058 | 0.0% |
| 2024-02-03 00:07 | 2024-02-02 | MIZELL STEVEN | Officer - EVP, Chief HR Officer | OPT+S | $126.65 | 50,694 | $6,420,349 | 23,619 | 0.0% |
| 2023-11-13 15:36 | 2023-11-09 | Oosthuizen Johannes Jacobus | Officer - President, U.S. Market | SELL | $102.38 | 2,081 | $213,061 | 18,191 | -10.3% |
| 2023-11-09 17:04 | 2023-11-08 | DeLuca Richard R. | Officer - EVP&Pres, Merck Animal Heallth | SELL | $105.03 | 43,823 | $4,602,668 | 111,764 | -28.2% |
| 2023-08-15 23:08 | 2023-08-14 | MIZELL STEVEN | Officer - EVP, Chief HR Officer | SELL | $109.01 | 4,250 | $463,293 | 22,935 | -15.6% |
| 2023-08-04 23:06 | 2023-08-03 | MIZELL STEVEN | Officer - EVP, Chief HR Officer | SELL | $105.49 | 4,500 | $474,701 | 27,185 | -14.2% |
| 2023-08-03 23:08 | 2023-08-02 | Romanelli Joseph | Officer - President, Human Health Int?l | SELL | $107.37 | 89 | $9,556 | 0 | -100.0% |
| 2023-06-30 23:04 | 2023-03-24 | Romanelli Joseph | Officer - President, Human Health Int?l | SELL | $104.65 | 35 | $3,663 | 20,596 | -0.2% |
| 2023-06-30 23:04 | 2022-12-02 | Romanelli Joseph | Officer - President, Human Health Int?l | BUY | $108.40 | 409 | $44,336 | 20,599 | +2.0% |
| 2023-05-06 00:13 | 2023-05-04 | Zachary Jennifer | Officer - EVP, General Counsel | SELL | $117.59 | 19,141 | $2,250,834 | 35,128 | -35.3% |
| 2023-05-05 23:54 | 2023-05-04 | Karachun Rita A | Officer - Sr. VP Fince-Global Controller | OPT+S | $117.53 | 15,875 | $1,865,843 | 45,710 | 0.0% |
| 2023-05-06 00:19 | 2023-05-03 | MIZELL STEVEN | Officer - EVP, Chief HR Officer | OPT+S | $119.01 | 53,400 | $6,355,054 | 31,685 | 0.0% |
| 2023-05-03 23:29 | 2023-05-02 | Williams David Michael | Officer - EVP,Chief Info&Digital Officer | OPT+S | $116.82 | 7,509 | $877,222 | 11,059 | 0.0% |
| 2023-05-02 18:37 | 2023-04-28 | DeLuca Richard R. | Officer - EVP&Pres, Merck Animal Heallth | OPT+S | $115.55 | 141,599 | $16,361,595 | 154,493 | 0.0% |
| 2023-04-29 00:15 | 2023-04-28 | Davis Robert M | Director, Officer - Chairman, CEO & President | OPT+S | $114.93 | 143,329 | $16,472,845 | 271,817 | 0.0% |
| 2023-04-14 23:34 | 2023-04-13 | Chattopadhyay Sanat | Officer - Exe V-P & Pres. MMD | OPT+S | $115.07 | 134,055 | $15,425,065 | 0 | 0.0% |
| 2023-02-16 19:58 | 2023-02-15 | Romanelli Joseph | Officer - President, Human Health Int?l | SELL | $108.22 | 5,000 | $541,101 | 20,284 | -19.8% |
| 2023-02-14 18:03 | 2023-02-13 | MIZELL STEVEN | Officer - EVP, Chief HR Officer | SELL | $109.10 | 1,815 | $198,017 | 33,085 | -5.2% |
| 2023-02-10 19:28 | 2023-02-09 | MIZELL STEVEN | Officer - EVP, Chief HR Officer | SELL | $107.00 | 5,000 | $535,007 | 34,900 | -12.5% |
| 2023-02-08 18:27 | 2023-02-06 | MIZELL STEVEN | Officer - EVP, Chief HR Officer | SELL | $104.25 | 4,436 | $462,473 | 39,900 | -10.0% |
| 2023-02-07 00:21 | 2023-02-03 | Zachary Jennifer | Officer - EVP, General Counsel | OPT+S | $103.17 | 75,436 | $7,782,762 | 53,920 | 0.0% |
| 2023-01-12 00:22 | 2023-01-09 | Chattopadhyay Sanat | Officer - Exe V-P & Pres. MMD | OPT+S | $112.29 | 83,994 | $9,431,913 | 29,500 | 0.0% |
| 2022-11-11 00:44 | 2022-11-09 | Oosthuizen Johannes Jacobus | Officer - President, U.S. Market | SELL | $103.21 | 1,795 | $185,262 | 16,731 | -9.7% |
| 2022-11-11 00:42 | 2022-11-09 | Davis Robert M | Director, Officer - CEO & President | OPT+S | $102.44 | 167,613 | $17,169,840 | 247,593 | 0.0% |
How to Interpret $MRK Trades
Not every insider transaction in Merck & Co., Inc. is a signal for immediate action. Professional investors look for "cluster buying"—when multiple executives simultaneously purchase $MRK shares on the open market. It is crucial to distinguish between scheduled sales (under Rule 10b5-1) and voluntary increases in ownership, which demonstrate management’s true conviction that the stock is undervalued.
Data Source & Accuracy for MRK
Insider activity data for Merck & Co., Inc. is streamed in real-time directly from the SEC EDGAR system. We analyze raw Form 4 filings, filtering out technical adjustments and complex derivative transactions. This provides a transparent view of how ownership structure is evolving in $MRK, allowing you to follow the capital of those with the most intimate knowledge of the company.
UNDERSTANDING THE DATA
FILING DATE: The date and time when the transaction was reported to the SEC. This is when the public first receives the information.
TRADE DATE: The actual day the insider executed the purchase or sale in the market.
INDUSTRY: The specific market sector the company operates in. Useful for identifying broader institutional capital flows across sectors.
OWNED AFTER: The total number of shares held by the insider following the transaction. This highlights the insider's remaining conviction in the company.
CHANGE %: The percentage increase or decrease of the insider's total position. Large percentage changes often carry more weight than the dollar amount alone.
TRADE TYPES DEFINITIONS
BUY: An open market purchase. Typically indicates an insider's belief that the stock is undervalued or poised for growth.
SELL: An open market sale. While often used for diversification or liquidity, large or unexpected sales can be a warning signal.
OPT+S (OPTION EXERCISE & SALE): This occurs when an insider exercises their stock options and sells them immediately. Often part of a structured compensation plan.