Chaitan Khosla Ph.D. is Director at KOSAN BIOSCIENCES INC (KOSN). They have made 4 open-market trades across 1 company since 2006, most recently 2024-06-11.
CIK 0001135139
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 4 sales. Too few scored purchases to measure a record yet.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| PTGX | SELL · 10b5-1 | 2020-08-11 | 2020-08-12 | $17.19 | $43K | +27.5% | +17.9% | +33.4% |
| KOSN | SELL | 2007-03-26 | 2007-03-28 | $5.26 | $263K | N/A | N/A | N/A |
| KOSN | SELL | 2006-04-17 | 2006-04-19 | $5.55 | $36K | N/A | N/A | N/A |
| KOSN | SELL | 2006-03-14 | 2006-03-16 | $5.92 | $38K | N/A | N/A | N/A |
| KOSN | SELL | 2006-02-08 | 2006-02-10 | $5.00 | $20K | 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.