MERCK & CO INC (MRK) is a publicly traded company in the Unknown sector. Across all available filings, 53 corporate insiders have executed 1018 transactions totaling $1.1B, demonstrating a bearish sentiment with -$1.0B in net insider flow. The most recent transaction on Feb 10, 2026 involved a sale of 10,235 shares valued at $1.2M.
No significant insider buying has been recorded for MRK in the recent period.
No significant insider selling has been recorded for MRK in the recent period.
Based on recent SEC filings, insider sentiment for MRK is bearish with an Insider Alignment Score of 0/100 and a net flow of -$1.0B. Insiders are reducing their positions, though this can be driven by factors unrelated to company outlook.
Insider trading at MERCK & CO INC (MRK) refers to stock transactions made by corporate insiders—executives, directors, and beneficial owners holding more than 10% of the company's shares. These individuals have access to material non-public information and are required by law to report their trades to the SEC within two business days. Currently, 53 insiders are actively trading MRK stock, having executed 1018 transactions in the past 90 days. The most active insider is Kenneth C. Frazier (Executive), who has made 135 transactions totaling $615.8M.
Get notified when executives and directors at MRK file new Form 4 transactions
Date | Insider | Title | Type | Shares | Price | Value | Flags |
|---|---|---|---|---|---|---|---|
| Feb 10, 2026 | Y. Li Dean | Executive VP & President, MRL | Sale | 10,235 | $117.52 | $1.2M | Large |
| Feb 6, 2026 | Jacobus Oosthuizen Johannes | President, U.S. Market | Sale | 15,000 | $121.87 | $1.8M | Large |
| Jan 26, 2026 | Guindo Chirfi | Chief Marketing Officer | Award | 9,865 | $107.40 | $1.1M | Large |
| Jan 26, 2026 | Y. Li Dean | Executive VP & President, MRL | Award | 20,469 | $107.40 | $2.2M | Large |
| Jan 26, 2026 | Litchfield Caroline | EVP & CFO | Award | 15,852 | $107.40 | $1.7M | C-SuiteLarge |
| Jan 26, 2026 | Jacobus Oosthuizen Johannes | President, U.S. Market | Award | 5,026 | $107.40 | $539.8K | Large |
| Jan 26, 2026 | Romanelli Joseph | President, Human Health Int?l | Award | 5,703 | $107.40 | $612.5K | Large |
| Jan 26, 2026 | E. Smart Dalton III | SVP Fin. - Global Controller | Award | 1,066 | $107.40 | $114.5K | |
| Jan 26, 2026 | Michael Williams David | EVP,Chief Info&Digital Officer | Award | 6,112 | $107.40 | $656.4K | Large |
| Dec 31, 2025 | Ellen Coe Mary | Executive | Award | 285.01 | $105.26 | $30.0K | |
| Dec 31, 2025 | H. Glocer Thomas | Executive | Award | 463.14 | $105.26 | $48.8K | |
| Dec 31, 2025 | E. Seidman Christine | Executive | Award | 77.19 | $105.26 | $8.1K | |
| Nov 10, 2025 | N. Downing Cristal | Executive | Sale | 7,085 | $87.00 | $616.4K | Large |
| Nov 3, 2025 | Michael Williams David | Executive | Sale | 8,614 | $83.59 | $720.0K | Large |
| Aug 4, 2025 | Guindo Chirfi | Executive | Payment | 18,175 | $79.29 | $1.4M | Large |
| TYPE | COUNT | VALUE | % |
|---|---|---|---|
Sale(S) | 266 | $1.1B | 64.6% |
Exercise(M) | 408 | $345.8M | 21.3% |
Award(A) | 154 | $197.9M | 12.2% |
Payment(F) | 159 | $31.7M | 2.0% |
Purchase(P) | 9 | $672.4K | 0.0% |
Disposition(D) | 2 | $404.6K | 0.0% |
Discretionary(I) | 1 | $225.0K | 0.0% |
Gift(G) | 19 | $0 | 0.0% |
Insider selling pressure at MERCK & CO INC has increased, with 53 insiders executing 1018 transactions across all time. Total sales of $1.1B significantly outpace purchases of $672.4K, resulting in a net outflow of $1.0B. This selling activity appears largely discretionary, which may warrant closer attention from investors.