Michael John Tomsicek is CFO at CUBIST PHARMACEUTICALS INC (CBST). They have made 10 open-market trades across 3 companies since 2013, most recently 2026-05-18.
CIK 0001570392
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.
1 open-market purchase totalling $80K since 2022, against 9 sales. Too few scored purchases to measure a record yet.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| MIST | BUY | 2022-10-19 | 2022-10-21 | $5.32 | $80K | -8.0% | -13.3% | -31.4% |
| CRSP | SELL | 2021-08-06 | 2021-08-10 | $138.52 | $6.9M | -13.4% | -10.2% | -30.4% |
| CRSP | SELL | 2020-09-01 | 2020-09-03 | $92.43 | $1.4M | -1.0% | +0.3% | +52.1% |
| CRSP | SELL | 2020-08-03 | 2020-08-05 | $86.92 | $1.5M | -5.5% | -15.4% | -10.5% |
| CBST | SELL | 2014-08-18 | 2014-08-18 | $63.68 | $26K | N/A | N/A | N/A |
| CBST | SELL | 2014-05-14 | 2014-05-14 | $69.00 | $34K | N/A | N/A | N/A |
| CBST | SELL | 2014-04-16 | 2014-04-16 | $64.00 | $28K | N/A | N/A | N/A |
| CBST | SELL | 2014-02-18 | 2014-02-19 | $75.00 | $42K | N/A | N/A | N/A |
| CBST | SELL | 2013-09-03 | 2013-09-05 | $64.08 | $26K | N/A | N/A | N/A |
| CBST | SELL | 2013-05-14 | 2013-05-15 | $49.18 | $24K | N/A | N/A | N/A |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.