Michel Vounatsos is CEO at BIOGEN INC. (BIIB). They have made 5 open-market trades across 1 company since 2017, most recently 2026-06-17.
CIK 0001672709
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.
5 open-market purchases totalling $4.5M since 2017, never a sale. Across 5 scored buys the stock is down 3.3% at ninety days, and 5.0 points behind the S&P over the same stretch.
5 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 20% | 20% | 60% |
| Avg Move | -1.9% | -3.0% | -3.3% |
| Alpha | -1.9% | -3.3% | -5.0% |
| Scored | 5 | 5 | 5 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| BIIB | BUY | 2020-11-30 | 2020-12-01 | $241.31 | $748K | -2.2% | -0.8% | +10.7% |
| BIIB | BUY | 2019-05-01 | 2019-05-02 | $231.48 | $2.0M | -1.5% | -4.0% | +2.2% |
| BIIB | BUY | 2017-12-29 | 2018-01-02 | $320.55 | $250K | +0.7% | +3.8% | -20.0% |
| BIIB | BUY | 2017-05-01 | 2017-05-02 | $271.35 | $761K | -6.1% | -7.0% | +6.7% |
| BIIB | BUY | 2017-02-27 | 2017-03-01 | $285.39 | $761K | -0.2% | -6.9% | -16.0% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.