Sanat Chattopadhyay is President at Merck & Co., Inc. (MRK). They have made 8 open-market trades across 1 company since 2018, most recently 2026-04-29.
CIK 0001670690
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 8 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| MRK | 15,347 | $2.2M |
Shares reported on the most recent Form 4, priced at the 2026-05-01 close.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MRK | SELL | 2023-04-13 | 2023-04-14 | $115.07 | $30.9M | -2.0% | +0.6% | -8.1% |
| MRK | SELL | 2023-01-09 | 2023-01-11 | $112.29 | $18.9M | -2.2% | -2.1% | +1.4% |
| MRK | SELL | 2022-10-28 | 2022-11-01 | $100.10 | $20.1M | -1.7% | +10.2% | +6.5% |
| MRK | SELL | 2021-10-29 | 2021-11-02 | $87.32 | $4.3M | -5.4% | -16.8% | -8.2% |
| MRK | SELL | 2020-08-13 | 2020-08-17 | $83.01 | $1.7M | +1.1% | +0.8% | -5.5% |
| MRK | SELL | 2019-02-12 | 2019-02-14 | $78.62 | $11.6M | +1.2% | +2.1% | -2.6% |
| MRK | SELL | 2019-02-12 | 2019-02-14 | $78.62 | $5.8M | +1.2% | +2.1% | -2.6% |
| MRK | SELL | 2018-08-03 | 2018-08-06 | $65.20 | $3.8M | +4.2% | +3.8% | +10.6% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.