Wendy L. Yarno is CMO at MERCK & CO INC (MRK). They have made 6 open-market trades across 4 companies since 2007, most recently 2026-09-15.
CIK 0001181186
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.
2 open-market purchases totalling $100K since 2017, against 4 sales. Too few scored purchases to measure a record yet.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MYOK | BUY | 2017-08-14 | 2017-08-16 | $35.50 | $50K | +5.8% | +9.9% | -11.7% |
| ALDR | BUY | 2017-07-18 | 2017-07-18 | $10.00 | $50K | -8.0% | -24.5% | +3.8% |
| STJ | SELL | 2013-10-18 | 2013-10-22 | $56.50 | $1.3M | -9.2% | -0.4% | -0.4% |
| STJ | SELL | 2013-04-23 | 2013-04-25 | $41.18 | $231K | -9.2% | -0.4% | -0.4% |
| MRK | SELL | 2007-10-26 | 2007-10-29 | $57.37 | $8.4M | -2.6% | +0.9% | +0.9% |
| MRK | SELL | 2007-04-25 | 2007-04-26 | $51.56 | $2.1M | -2.6% | +0.9% | +0.9% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.
| $17K |
| Total | $11.2M |