Generation Bio Co. (GBIO) Insider Trading & SEC Filings

Updated Jul 16, 2026 · Last SEC filing 2026-02-09

Generation Bio Co. (GBIO) — no SEC Form 4 insider filings recorded in the last 90 days. InsiderAlpha tracks every GBIO SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.

About Generation Bio Co. (GBIO)

SIC classification	Pharmaceutical Preparations (SIC 2834)
SEC CIK	0001733294

Recent GBIO Insider Transactions (Form 4)

Date	Insider	Role	Transaction	Shares	Price	Value	Filing
2026-02-09	Quinn Anthony G.	Director	J — Other acquisition / disposition	7.3K	—	—	SEC
2026-02-09	Nicholson Donald William	Director	J — Other acquisition / disposition	21.4K	—	—	SEC
2026-02-09	Rhodes Jason P	Director	J — Other acquisition / disposition	711.2K	—	—	SEC
2026-02-09	Quinn Anthony G.	Director	J — Other acquisition / disposition	29.9K	—	—	SEC
2026-02-09	Rowland Charles A Jr	Director	J — Other acquisition / disposition	53.5K	—	—	SEC
2026-02-09	Stehman-Breen Catherine	Director	J — Other acquisition / disposition	4.8K	—	—	SEC
2026-02-09	Appelhans Dannielle	Director	J — Other acquisition / disposition	736	—	—	SEC
2026-02-09	Atlas Venture Fund X, L.P.	Insider	J — Other acquisition / disposition	711.2K	—	—	SEC
2026-02-09	Rhodes Jason P	Director	J — Other acquisition / disposition	116.7K	—	—	SEC
2026-02-09	Rhodes Jason P	Director	J — Other acquisition / disposition	60	—	—	SEC
2026-02-09	Atlas Venture Fund X, L.P.	Insider	J — Other acquisition / disposition	116.7K	—	—	SEC
2026-02-09	Appelhans Dannielle	Director	J — Other acquisition / disposition	1.3K	—	—	SEC
2026-02-09	Christensen Gustav	Director	J — Other acquisition / disposition	13.1K	—	—	SEC
2026-02-09	Atlas Venture Fund X, L.P.	Insider	J — Other acquisition / disposition	60	—	—	SEC
2026-02-09	MCDONOUGH GEOFF	Director	J — Other acquisition / disposition	138.5K	—	—	SEC

All transactions sourced from SEC EDGAR Form 4 filings for Generation Bio Co. (GBIO). Updated in real time as new filings are submitted to the SEC.

Recent Insider Filings

2026-02-09 — Atlas Venture Fund X, L.P. (Insider)
2026-02-09 — Stehman-Breen Catherine (Director)
2026-02-09 — Rowland Charles A Jr (Director)
2026-02-09 — Rhodes Jason P (Director)
2026-02-09 — Quinn Anthony G. (Director)

Form 4 Transaction Code Reference

SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in GBIO insider filings:

P	Open-market purchase by the insider
S	Open-market sale by the insider
A	Grant, award, or other acquisition from the issuer
M	Exercise or conversion of derivative security (e.g. options)
F	Payment of exercise price or tax liability via share withholding
G	Bona-fide gift of securities
D	Disposition to the issuer (e.g. share buyback participation)
J	Other acquisition or disposition
X	Exercise of in-the-money or at-the-money derivative security
C	Conversion of derivative security
V	Transaction voluntarily reported earlier than required

GBIO Insider Trading — FAQ

What is the latest insider trade for GBIO?: Generation Bio Co. (GBIO) had 0 insider filings in the last 90 days, with the most recent on 2026-02-09. InsiderAlpha tracks every Form 4, 10-K, 10-Q, and 8-K filing in real time.
How many insiders are buying GBIO stock?: 0 insider purchases of GBIO were filed in the last 90 days.
How many insiders are selling GBIO stock?: 0 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)?: InsiderAlpha aggregates every GBIO SEC filing — Form 4 insider transactions, 10-K and 10-Q quarterly reports, and 8-K material event disclosures — in one timeline.

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