Webster Stephen W (CIK 1438421) reported 1 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2025-04-08). Recent activity: Sell GRTS (25,000 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2025-04-08 | Gritstone bio, Inc. (GRTS) | Director | Sell | 25,000 | $0 |
Source: SEC Form 4 filings · as of 2025-04-08