Generation Bio Co. (GBIO)
Data as of , from SEC Form 4 filings.
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About Generation Bio Co. (GBIO)
Generation Bio Co. is an SEC registrant, filing under CIK 0001733294, classified as pharmaceutical preparations. We track it alongside the rest of the Health Care sector.
GBIO Form 4 activity by transaction type, last 90 days
No Form 4 activity for GBIO in the last 90 days.
GBIO insider transactions (Form 4)
2839 Form 4 filings on record, the earliest from Oct 17, 2024, newest first. Filing history page 2 of 2.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
 Phillip Samayoa - Officer | Option exercise | Common Stock | 1,147 | - | - | |
| Phillip Samayoa - Officer | Tax withholding / forfeiture | Common Stock | 337 | $4.26 | $144 | |
| Phillip Samayoa - Officer | Option exercise | Restricted Stock Units | 1,147 | $0.00 | - | |
 Geoff McDonough - Officer | Option exercise | Common Stock | 5,273 | - | - | |
| Geoff McDonough - Officer | Tax withholding / forfeiture | Common Stock | 1,548 | $4.26 | $659 | |
| Geoff McDonough - Officer | Option exercise | Restricted Stock Units | 5,273 | $0.00 | - | |
| Jeffrey M. Jonas | Grant or award | Stock Option (right to buy) | 30,000 | $0.00 | - | |
| Matthew Stanton - Officer | Option exercise | Common Stock | 1,674 | - | - | |
| Matthew Stanton - Officer | Tax withholding / forfeiture | Common Stock | 492 | $24.20 | $1K | |
| Matthew Stanton - Officer | Option exercise | Restricted Stock Units | 1,674 | $0.00 | - | |
| Phillip Samayoa - Officer | Option exercise | Common Stock | 1,147 | - | - | |
| Phillip Samayoa - Officer | Tax withholding / forfeiture | Common Stock | 337 | $24.20 | $816 | |
| Phillip Samayoa - Officer | Option exercise | Restricted Stock Units | 1,147 | $0.00 | - | |
| Matthew Norkunas - Officer | Option exercise | Common Stock | 1,674 | - | - | |
| Matthew Norkunas - Officer | Tax withholding / forfeiture | Common Stock | 492 | $24.20 | $1K | |
| Matthew Norkunas - Officer | Option exercise | Common Stock | 1,673 | - | - | |
| Matthew Norkunas - Officer | Tax withholding / forfeiture | Common Stock | 492 | $24.20 | $1K | |
| Matthew Norkunas - Officer | Option exercise | Restricted Stock Units | 1,674 | $0.00 | - | |
| Matthew Norkunas - Officer | Option exercise | Restricted Stock Units | 1,673 | $0.00 | - | |
 Yalonda Howze - Officer | Option exercise | Common Stock | 3,347 | $24.20 | $8K | |
| Yalonda Howze - Officer | Tax withholding / forfeiture | Common Stock | 983 | - | - | |
| Yalonda Howze - Officer | Option exercise | Restricted Stock Units | 3,347 | $0.00 | - | |
 Antoinette Paone - Officer | Option exercise | Common Stock | 1,592 | - | - | |
| Antoinette Paone - Officer | Tax withholding / forfeiture | Common Stock | 468 | $24.20 | $1K | |
| Antoinette Paone - Officer | Option exercise | Restricted Stock Units | 1,592 | $0.00 | - | |
| Geoff McDonough - Officer | Option exercise | Common Stock | 5,274 | - | - | |
| Geoff McDonough - Officer | Tax withholding / forfeiture | Common Stock | 1,548 | $24.20 | $4K | |
| Geoff McDonough - Officer | Option exercise | Restricted Stock Units | 5,274 | $0.00 | - |
GBIO insider trading FAQ
What is the latest insider trade for GBIO?
Generation Bio Co. (GBIO) has filed no insider reports in the last 90 days. The most recent on record is dated 2026-02-09. The full record for GBIO runs to 39 Form 4 filings, the earliest from 2024-10-17. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying GBIO stock?
No insider purchases of GBIO were filed in the last 90 days.
How many insiders are selling GBIO stock?
No insider sales of GBIO were filed in the last 90 days.
Where can I see GBIO SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects GBIO Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Health Care companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - Atlas Venture Fund X, L.P. view on EDGAR
- - Catherine Stehman-Breen view on EDGAR
- - Charles A. Rowland Jr. view on EDGAR
- - Jason P. Rhodes view on EDGAR
- - Anthony G. Quinn view on EDGAR
- - Donald William Nicholson view on EDGAR
- - Geoff McDonough view on EDGAR
- - Jeffrey M. Jonas view on EDGAR
- - Yalonda Howze view on EDGAR
Related companies with recent insider activity
Learn more
- What the Form 4 transaction codes mean
- Grants, option exercises, gifts and tax withholding are not trades on the market. The codes say which is which.
- Insider activity in Health Care
- Where GBIO's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
Follow GBIO with a 7-day demo
- GBIO on your watchlist
- Every GBIO Form 4 filing on record
- Up to 3 months of GBIO price history
- The daily trading plan of ranked insider buys, on a delay, with the plan archive
