David B. Singer is Director at OSCIENT PHARMACEUTICALS CORP (OSCI). They have made 8 open-market trades across 2 companies since 2006, most recently 2026-05-29.
CIK 0001240366
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 8 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| INFQ | 2,429,980 | $20.8M |
| SEER | 1,934,954 | $3.3M |
| CSLT | 405,184 | $831K |
| ONEM | 264 | $4K |
| OSCI | 164,633 | — |
| Total | $24.9M |
Shares reported on the most recent Form 4, priced at the 2026-05-29 close. 1 holding could not be priced and is excluded from the total.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| INFQ | SELL | 2026-05-29 | 2026-05-29 | $16.10 | $28.9M | -15.0% | -13.6% | -10.5% |
| INFQ | SELL | 2026-05-27 | 2026-05-29 | $15.50 | $47.6M | -15.0% | -13.6% | -10.5% |
| INFQ | SELL | 2026-05-21 | 2026-05-27 | $15.63 | $181.6M | -6.4% | -13.8% | -12.6% |
| OSCI | SELL | 2006-06-07 | 2006-06-09 | $1.22 | $44K | N/A | N/A | N/A |
| OSCI | SELL | 2006-06-01 | 2006-06-05 | $1.25 | $56K | N/A | N/A | N/A |
| OSCI | SELL | 2006-05-26 | 2006-05-31 | $1.31 | $58K | N/A | N/A | N/A |
| OSCI | SELL | 2006-05-25 | 2006-05-26 | $1.32 | $98K | N/A | N/A | N/A |
| OSCI | SELL | 2006-05-22 | 2006-05-26 | $1.36 | $84K | 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.