Christopher J. Twomey is President & VP at BIOSITE INC (BSTE). They have made 16 open-market trades across 3 companies since 2007, most recently 2026-05-21.
CIK 0001238935
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 $211K since 2018, against 14 sales. Too few scored purchases to measure a record yet.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| TNDM | SELL | 2022-05-05 | 2022-05-10 | $111.73 | $28K | +4.5% | -8.9% | -12.7% |
| TNDM | SELL · 10b5-1 | 2021-09-07 | 2021-09-09 | $123.00 | $37K | -1.6% | +2.2% | +11.6% |
| TNDM | SELL | 2021-09-02 | 2021-09-03 | $115.01 | $1.5M | +0.1% | -3.9% | +3.7% |
| TNDM | SELL | 2021-07-29 | 2021-07-30 | $105.00 | $840K | -5.4% | +4.0% | +24.0% |
| TNDM | SELL | 2021-05-19 | 2021-05-20 | $89.03 | $24K | +1.5% | +11.1% | +31.9% |
| TNDM | SELL | 2021-04-21 | 2021-04-23 | $95.01 | $760K | -6.1% | -10.2% | +9.4% |
| TNDM | SELL | 2020-07-31 | 2020-08-04 | $110.04 | $825K | -8.1% | +4.1% | +2.8% |
| TNDM | SELL | 2020-07-02 | 2020-07-07 | $100.33 | $1.3M | +1.0% | +3.3% | +11.3% |
| TNDM | SELL | 2020-05-07 | 2020-05-08 | $90.03 | $1.1M | -0.1% | -3.8% | +23.8% |
| TNDM | SELL | 2020-04-30 | 2020-05-04 | $80.00 | $345K | +2.9% | -0.7% | +28.0% |
| BNGO | BUY | 2018-08-23 | 2018-08-27 | $6.13 | $61K | -23.7% | -34.7% | -35.0% |
| TNDM | BUY | 2018-02-09 | 2018-02-13 | $2.00 | $150K | +20.2% | +49.6% | +332.0% |
| BSTE | SELL | 2007-06-20 | 2007-06-21 | $92.33 | $277K | N/A | N/A | N/A |
| BSTE | SELL | 2007-06-07 | 2007-06-07 | $92.02 | $14.5M | N/A | N/A | N/A |
| BSTE | SELL | 2007-06-06 | 2007-06-06 | $92.00 | $570K | N/A | N/A | N/A |
| BSTE | SELL | 2007-06-05 | 2007-06-05 | $92.01 | $653K | N/A | N/A | N/A |
| BSTE | SELL | 2007-06-04 | 2007-06-04 | $92.00 | $5.0M | 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.