Merck & Co., Inc. insider trading
MRK$144.30+0.49 (+0.34%)
“Insiders might sell their shares for any number of reasons, but they buy them for only one: they think the price will rise.”
Insider Trading vs Stock Price
Insider Trading vs Stock Price data
Showing the 1Y range: Oct 2, 2025 to Oct 2, 2026. Price (+61.2%). 0 insider transactions plotted in this window as 0 markers; nearby trades of the same kind are grouped.
| Date | Category | Person | Role | Action | Amount | Change in holding |
|---|
Open market purchase
Open market sellNet dollar flow · Buy / Sell balance
PremiumQ2 '25Q3 '25Q4 '25Q1 '26Q2 '26Q3 '26
Unlock quarterly net flowKey players
- RMRobert M. Davis0.0183%
- SCSanat Chattopadhyay0.0081%
- RRRichard R. DeLuca0.0045%
- DYDean Y. Li0.0038%
- CLCaroline Litchfield0.0037%
- JZJennifer Zachary0.0018%
- CGChirfi Guindo0.0015%
- DMDavid Michael Williams0.0013%
- JRJoseph Romanelli0.0012%
- JJJohannes Jacobus Oosthuizen0.0009%
AI Activity Analysis
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Insider activity
Fromto
| Company | Insider / role | Action | ΔOwn | Avg price | Amount | ||
|---|---|---|---|---|---|---|---|
| MRK | Chirfi Guindo | Open market sell$1.35M | -21.5% | $135.00 | $1.35M | Aug 13, 2026 | Aug 13, 2026 |
| MRK | Richard R. DeLuca | Open market sell$79.2K | -0.5% | $132.04 | $79.2K | Aug 12, 2026 | Aug 12, 2026 |
| MRK | Richard R. DeLuca | Open market sell$1.46M | -9.1% | $131.61 | $1.46M | Aug 12, 2026 | Aug 12, 2026 |
| MRK | Richard R. DeLuca | Open market sell$718K | -4.3% | $132.35 | $718K | Aug 11, 2026 | Aug 12, 2026 |
| MRK | Richard R. DeLuca | Open market sell$973K | -5.5% | $131.33 | $973K | Aug 11, 2026 | Aug 12, 2026 |
| MRK | Richard R. DeLuca | Open market sell$2.71M | -13.4% | $130.43 | $2.71M | Aug 10, 2026 | Aug 12, 2026 |
| MRK | Richard R. DeLuca | Open market sell$39.3K | -0.2% | $131.02 | $39.3K | Aug 6, 2026 | Aug 10, 2026 |
| MRK | Richard R. DeLuca | Open market sell$644K | -3.1% | $130.23 | $644K | Aug 6, 2026 | Aug 10, 2026 |
| MRK | Richard R. DeLuca | Open market sell$105K | -0.5% | $131.02 | $105K | Aug 6, 2026 | Aug 10, 2026 |
| MRK | Chirfi Guindo | Open market sell$1.97M | -24.4% | $131.00 | $1.97M | Aug 6, 2026 | Aug 7, 2026 |
| MRK | Chirfi Guindo | Open market sell$1.21M | -14.2% | $121.46 | $1.21M | Feb 12, 2026 | Feb 12, 2026 |
| MRK | Dean Y. Li | Open market sell$1.2M | -10.0% | $117.52 | $1.2M | Feb 10, 2026 | Feb 10, 2026 |
| MRK | Chirfi Guindo | Open market sell$1.18M | -12.4% | $118.41 | $1.18M | Feb 9, 2026 | Feb 9, 2026 |
| MRK | Johannes Jacobus Oosthuizen | Open market sell$1.83M | -41.4% | $121.87 | $1.83M | Feb 6, 2026 | Feb 6, 2026 |
| MRK | Richard R. DeLuca | Open market sell$4.56M | -19.1% | $120.92 | $4.56M | Feb 6, 2026 | Feb 6, 2026 |
| MRK | Chirfi Guindo | Open market sell$2.44M | -19.9% | $121.88 | $2.44M | Feb 5, 2026 | Feb 6, 2026 |
| MRK | Robert M. Davis | Open market sell$3.84M | -6.8% | $118.35 | $3.84M | Feb 4, 2026 | Feb 6, 2026 |
| MRK | Robert M. Davis | Open market sell$1.76M | -3.1% | $117.38 | $1.76M | Feb 4, 2026 | Feb 6, 2026 |
| MRK | Cristal N. Downing | Open market sell$616K | -100.0% | $87.00 | $616K | Nov 10, 2025 | Nov 12, 2025 |
| MRK | David Michael Williams | Open market sell$720K | -26.0% | $83.59 | $720K | Nov 3, 2025 | Nov 4, 2025 |