Insider txns (12m)
36
Stock / equity
MRK Merck & Co., Inc.
Company profile, contracts and lobbying: Merck & Co., Inc.
MRK (Merck & Co., Inc.) has 36 disclosed insider transactions from 8 insiders in the last 12 months (0 open-market buys, 17 sales, about $41.5M at reported prices) and 0 congressional trades from 0 members of Congress. The most recent disclosure was filed August 13, 2026.
Open-market buys / sales
0 / 17
Congress trades (12m)
0
Distinct filers (12m)
8
Insider transactions
| Filer | Side | Trade date | Disclosed | Lag | Shares | Price | Value | Flags | Source |
|---|---|---|---|---|---|---|---|---|---|
| Zachary Jennifer | Option / conversion M | August 12, 2026 | August 13, 2026 | 1d | 13,433 | — | — | derivative | Form 4 ↗ |
| Zachary Jennifer | Option / conversion M | August 12, 2026 | August 13, 2026 | 1d | 41,494 | — | — | derivative | Form 4 ↗ |
| Zachary Jennifer | Sell S | August 12, 2026 | August 13, 2026 | 1d | 80,315 | $133 | $10.7M | Form 4 ↗ | |
| Zachary Jennifer | Option / conversion M | August 12, 2026 | August 13, 2026 | 1d | 13,433 | $85 | $1.1M | Form 4 ↗ | |
| Zachary Jennifer | Option / conversion M | August 12, 2026 | August 13, 2026 | 1d | 41,494 | $118 | $4.9M | Form 4 ↗ | |
| Guindo Chirfi | Sell S | August 13, 2026 | August 13, 2026 | 0d | 10,000 | $135 | $1.4M | Form 4 ↗ | |
| DeLuca Richard R. | Sell S | August 12, 2026 | August 12, 2026 | 0d | 600 | $132 | $79K | Form 4 ↗ | |
| DeLuca Richard R. | Sell S | August 12, 2026 | August 12, 2026 | 0d | 11,099 | $132 | $1.5M | Form 4 ↗ | |
| DeLuca Richard R. | Sell S | August 11, 2026 | August 12, 2026 | 1d | 5,427 | $132 | $718K | Form 4 ↗ | |
| DeLuca Richard R. | Sell S | August 11, 2026 | August 12, 2026 | 1d | 7,410 | $131 | $973K | Form 4 ↗ | |
| DeLuca Richard R. | Sell S | August 10, 2026 | August 12, 2026 | 2d | 20,784 | $130 | $2.7M | Form 4 ↗ | |
| DeLuca Richard R. | Sell S | August 6, 2026 | August 10, 2026 | 4d | 300 | $131 | $39K | Form 4 ↗ | |
| DeLuca Richard R. | Sell S | August 6, 2026 | August 10, 2026 | 4d | 4,945 | $130 | $644K | Form 4 ↗ | |
| DeLuca Richard R. | Sell S | August 6, 2026 | August 10, 2026 | 4d | 805 | $131 | $105K | Form 4 ↗ | |
| Guindo Chirfi | Sell S | August 6, 2026 | August 7, 2026 | 1d | 15,000 | $131 | $2.0M | Form 4 ↗ | |
| Williams David Michael | Option / conversion M | August 5, 2026 | August 7, 2026 | 2d | 34,705 | — | — | derivative | Form 4 ↗ |
| Williams David Michael | Option / conversion M | August 5, 2026 | August 7, 2026 | 2d | 13,542 | — | — | derivative | Form 4 ↗ |
| Williams David Michael | Option / conversion M | August 5, 2026 | August 7, 2026 | 2d | 4,600 | — | — | derivative | Form 4 ↗ |
| Williams David Michael | Sell S | August 5, 2026 | August 7, 2026 | 2d | 34,705 | $129 | $4.5M | Form 4 ↗ | |
| Williams David Michael | Option / conversion M | August 5, 2026 | August 7, 2026 | 2d | 34,705 | $74 | $2.6M | Form 4 ↗ | |
| Williams David Michael | Sell S | August 5, 2026 | August 7, 2026 | 2d | 13,542 | $129 | $1.7M | Form 4 ↗ | |
| Williams David Michael | Option / conversion M | August 5, 2026 | August 7, 2026 | 2d | 13,542 | $75 | $1.0M | Form 4 ↗ | |
| Williams David Michael | Sell S | August 5, 2026 | August 7, 2026 | 2d | 4,600 | $129 | $592K | Form 4 ↗ | |
| Williams David Michael | Option / conversion M | August 5, 2026 | August 7, 2026 | 2d | 4,600 | $78 | $357K | Form 4 ↗ | |
| Maraldo David R. | Option / conversion M | August 5, 2026 | August 7, 2026 | 2d | 2,686 | — | — | derivative | Form 4 ↗ |
| Maraldo David R. | Option / conversion M | August 5, 2026 | August 7, 2026 | 2d | 9,709 | — | — | derivative | Form 4 ↗ |
| Maraldo David R. | Option / conversion M | August 5, 2026 | August 7, 2026 | 2d | 6,311 | — | — | derivative | Form 4 ↗ |
| Maraldo David R. | Sell S | August 5, 2026 | August 7, 2026 | 2d | 2,686 | $129 | $346K | Form 4 ↗ | |
| Maraldo David R. | Option / conversion M | August 5, 2026 | August 7, 2026 | 2d | 2,686 | $85 | $228K | Form 4 ↗ | |
| Maraldo David R. | Sell S | August 5, 2026 | August 7, 2026 | 2d | 9,709 | $129 | $1.2M | Form 4 ↗ | |
| Maraldo David R. | Option / conversion M | August 5, 2026 | August 7, 2026 | 2d | 9,709 | $87 | $846K | Form 4 ↗ | |
| Maraldo David R. | Sell S | August 5, 2026 | August 7, 2026 | 2d | 6,311 | $129 | $812K | Form 4 ↗ | |
| Maraldo David R. | Option / conversion M | August 5, 2026 | August 7, 2026 | 2d | 6,311 | $74 | $465K | Form 4 ↗ | |
| Coe Mary Ellen | Other A | June 30, 2026 | July 1, 2026 | 1d | 233 | $129 | $30K | derivative | Form 4 ↗ |
| Karsanbhai Surendralal Lanca | Other A | June 30, 2026 | July 1, 2026 | 1d | 126 | $129 | $16K | derivative | Form 4 ↗ |
| Seidman Christine E | Other A | June 30, 2026 | July 1, 2026 | 1d | 63 | $129 | $8,125 | derivative | Form 4 ↗ |
Congressional trades
No member of Congress has disclosed a trade in this ticker in the filings we have parsed (House filings since the job went live; Senate pending).
Who is filing
- Zachary Jennifer — 5 transactions
- Guindo Chirfi — 2 transactions
- DeLuca Richard R. — 8 transactions
- Williams David Michael — 9 transactions
- Maraldo David R. — 9 transactions
- Coe Mary Ellen — 1 transaction
- Karsanbhai Surendralal Lanca — 1 transaction
- Seidman Christine E — 1 transaction
Sources and method
Insider rows are Form 4 filings for this issuer from SEC EDGAR; congressional rows are periodic transaction reports parsed from the House Clerk (and Senate eFD when live). Values use the reported price for Form 4 and the disclosed range for Congress. See methodology and corrections.
Not investment advice. Disclosures are shown as filed and may lag the trade or be amended. No recommendation is made or implied.