| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
| Insider | Role | Shares | Value | Buys | Sells |
|---|---|---|---|---|---|
| Date | Ticker | Insider | Role | Type | Shares | Price | Value | Chg% | SEC |
|---|---|---|---|---|---|---|---|---|---|
Chief Scientific Officer | Chief Strategy Officer
1 company
Phillip Samayoa last filed a Form 4 in October 2025, as Chief Scientific Officer at GBIO. Phillip Samayoa's net worth is not public. Form 4 filings only show shares in the companies where this person was an insider, as of the last filing.
Our model assigns Phillip Samayoa a middling insider score of 67/100, based on 3 past trades. Over a 12-month horizon, all 3 of those trades were profitable, with an average 12-month return of +50.8%.
Phillip Samayoa has 20 Form 4 filings on record from September 2022 to October 2025, all as Chief Scientific Officer at Generation Bio (GBIO), 2022–2025.
The 37 reported transactions were 14 option exercises, 14 tax withholdings, 6 option or other derivative awards and 3 open-market sales.
Counted by filing, the open-market trades come to no purchases and 3 sales worth about $30K.
The largest open-market sale was 3,116 shares of GBIO at an average $5.29 on July 3, 2023, about $16K. Twelve months later GBIO was down 54%.
Both sales since April 2023 were made under a Rule 10b5-1 trading plan, set up in advance.
Shares as reported in the last Form 4 for each company; the most recent is from October 2025. Values use today's prices. Any trades after the last filing were not reported, so current holdings may differ.
| Date | Ticker | Role | Type | Shares | Price | Value | Chg% | 3M | 12M | SEC |
|---|---|---|---|---|---|---|---|---|---|---|
| Jan 2, 2024 | GBIO Generation Bio Co. | Chief Strategy Officer | Sell10b5-1 | 2,445 | $1.62 | $3,960.90 | -2.2% | +130.6% | -40.3% | |
| Jul 3, 2023 | GBIO Generation Bio Co. | Chief Strategy Officer | Sell10b5-1 | 3,116 | $5.29 | $16,483.64 | -3.0% | -37.2% | -54.2% | |
| Jan 9, 2023 | GBIO Generation Bio Co. | Chief Strategy Officer | Sell | 1,865 | $5.11 | $9,530.15 | -1.9% | -7.1% | -57.8% |