David Michael Williams is VP at Merck & Co., Inc. (MRK). They have made 6 open-market trades across 1 company since 2023, most recently 2026-08-05.
CIK 0001820958
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 6 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| MRK | 31,716 | $4.6M |
Shares reported on the most recent Form 4, priced at the 2026-08-07 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MRK | SELL | 2026-08-05 | 2026-08-07 | $128.77 | $6.8M | +18.5% | +15.6% | — |
| MRK | SELL | 2026-02-06 | 2026-02-06 | $121.91 | $610K | +0.4% | -3.5% | -7.5% |
| MRK | SELL | 2025-11-03 | 2025-11-04 | $83.59 | $1.4M | +10.6% | +20.1% | +34.9% |
| MRK | SELL | 2025-02-13 | 2025-02-13 | $85.34 | $512K | +5.9% | +12.3% | -13.0% |
| MRK | SELL | 2024-02-07 | 2024-02-08 | $127.57 | $370K | +1.5% | -2.7% | +2.6% |
| MRK | SELL | 2023-05-02 | 2023-05-03 | $116.82 | $1.8M | -1.4% | -4.6% | -10.8% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.