Companies / Generation Bio Co.
Generation Bio Co.
GBIOCIK 1733294CAMBRIDGE, MA
Financials ยท FY2024
Ownership
6.7M shares outstanding ยท as of Oct 31, 2025
Ownership
| 10%+ / strategic | 7.38% | 497,255 |
| Public float | 92.62% | 6,240,644 |
% of common shares outstanding (exact, from the latest cover-page filing). Institutions are quarterly 13F snapshots; insiders reflect current officers & directors.
Insiders 18
View all โ| Insider | % of shares | Shares |
|---|---|---|
Appelhans DannielleDirector | 0.00% | 0 |
Atlas Venture Fund X, L.P.10% owner | 0.00% | 0 |
Christensen GustavDirector | 0.00% | 0 |
Conway Kevin JohnFormerCHIEF FINANCIAL OFFICER | 0.00% | 0 |
Cooper Ronald Harold WilfredFormerDirector | 0.00% | 0 |
Howze YalondaCEOFormerINTERIM CEO AND PRESIDENT | 0.00% | 0 |
McDonough GeoffDirector | 0.00% | 0 |
Nicholson Donald WilliamFormerDirector | 0.00% | 0 |
Quinn Anthony G.Director | 0.00% | 0 |
Rhodes Jason PDirector | 0.00% | 0 |
Institutional holders 0
| Holder | Value | % of shares |
|---|---|---|
| No institutional holders on file. | ||
Activity
InsidersInstitutions
What insiders are doing in this stock (Form 4).| Date | Actor | Action | Security | Value | Shares ฮ | Position after | Impact |
|---|---|---|---|---|---|---|---|
| Feb 2, 2026 | McDonough Geoff Director | Other | Common Stock | $3.1K | -550 -0.40% | 138,492 2.06% of shares | low |
| Feb 2, 2026 | Howze Yalonda CEO | Other | Common Stock | $2.8K | -495 -11.64% | 3,759 0.06% of shares | low |
| Jan 15, 2026 | McDonough Geoff Director | Other | Common Stock | $773 | -137 -0.10% | 137,460 2.04% of shares | low |
| Jan 15, 2026 | Howze Yalonda CEO | Other | Common Stock | $558 | -99 -3.69% | 2,581 0.04% of shares | low |
| Feb 2, 2026 | Conway Kevin John Executive | Other | Common Stock | $406 | -72 -3.36% | 2,072 0.03% of shares | low |
| Jan 15, 2026 | Conway Kevin John Executive | Other | Common Stock | $96 | -17 -0.88% | 1,909 0.03% of shares | low |
| Feb 9, 2026 | Howze Yalonda CEO | Other | Stock Option (right to buy) | โ | -8K -100.00% | 0 0.00% of shares | low |
| Feb 9, 2026 | Howze Yalonda CEO | Other | Stock Option (right to buy) | โ | -25K -100.00% | 0 0.00% of shares | low |
5%+ ownership events
Schedule 13D / 13G
| Filer | Stance | % of class |
|---|---|---|
| Renaissance Technologies LLC | Passive13G/A | โ |
| Baselake Partners, LP | Passive13G/A | โ |
| T. Rowe Price Associates, Inc. | Passive13G/A | โ |
| Baselake Partners, LP | Passive13G | โ |