Generation Bio Co. (GBIO)

Latest Insider Confidence Score

2026Q1

48.0
Bearish

Company insider confidence (by quarter)

2020Q2 2026Q1

Largest shareholders

Insider Role (last 12 mo) Shares held Filed at
Atlas Venture Associates Opportunity I, LLC 10% Owner 8,278,876 Sep 29, 2021
Atlas Venture Opportunity Fund I, L.P. 10% Owner 8,278,876 Sep 29, 2021
Atlas Venture Associates X, L.P. 10% Owner 8,278,876 Sep 29, 2021
Atlas Venture Associates X, LLC 10% Owner 8,278,876 Sep 29, 2021
Patel Rajiv A 10% Owner 4,956,457 Jun 17, 2020

Recent buy/sell transactions

Exec date Filing date Insider Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Feb 9, 2026 Feb 9, 2026 Atlas Venture Fund X, L.P. 10% Owner Neutral 47.5 -827,946 -100.00% ✗ -
Feb 9, 2026 Feb 9, 2026 Stehman-Breen Catherine Director Neutral 47.5 -4,752 -100.00% ✗ -
Feb 9, 2026 Feb 9, 2026 Rowland Charles A Jr Director Neutral 47.5 -53,475 -100.00% ✗ -
Feb 9, 2026 Feb 9, 2026 Rhodes Jason P Director Neutral 47.5 -827,946 -100.00% ✗ -
Feb 9, 2026 Feb 9, 2026 Quinn Anthony G. Director Neutral 47.5 -37,211 -100.00% ✗ -
Feb 9, 2026 Feb 9, 2026 Nicholson Donald William Director Neutral 47.5 -21,357 -100.00% ✗ -
Feb 9, 2026 Feb 9, 2026 MCDONOUGH GEOFF Director Neutral 47.5 -188,638 -100.00% ✗ -
Feb 9, 2026 Feb 9, 2026 JONAS JEFFREY M Director Neutral 52.5 - 0.00% ✗ -
Feb 9, 2026 Feb 9, 2026 Howze Yalonda CEO Neutral 47.5 -3,759 -100.00% ✗ -
Feb 9, 2026 Feb 9, 2026 Cooper Ronald Harold Wilfred Director Neutral 47.5 -950 -100.00% ✗ -
Feb 9, 2026 Feb 9, 2026 Conway Kevin John CFO Neutral 47.5 -2,072 -100.00% ✗ -
Feb 9, 2026 Feb 9, 2026 Christensen Gustav Director Neutral 47.5 -13,142 -100.00% ✗ -
Feb 9, 2026 Feb 9, 2026 Appelhans Dannielle Director Neutral 47.5 -1,999 -100.00% ✗ -
Feb 2, 2026 Feb 4, 2026 Conway Kevin John CFO Sell 27.5 -72 -3.36% ✗ $406.1
Feb 2, 2026 Feb 4, 2026 MCDONOUGH GEOFF Director Sell 45.0 -550 -0.29% ✗ $3.1K
Feb 2, 2026 Feb 4, 2026 Howze Yalonda CEO Sell 27.5 -495 -11.64% ✗ $2.8K
Jan 15, 2026 Jan 16, 2026 Conway Kevin John CFO Sell 37.5 -17 -0.88% ✗ $95.9
Jan 15, 2026 Jan 16, 2026 MCDONOUGH GEOFF Director Sell 52.5 -137 -0.07% ✗ $772.7
Jan 15, 2026 Jan 16, 2026 Howze Yalonda CHIEF LEGAL OFFICER Sell 27.5 -99 -3.69% ✗ $558.4
Oct 31, 2025 Nov 21, 2025 MCDONOUGH GEOFF Director Sell 52.5 -293 -0.16% ✗ $1.6K
Oct 31, 2025 Samayoa Phillip CHIEF SCIENTIFIC OFFICER Neutral 52.5 - 0.00% ✗ -
Oct 31, 2025 Paone Antoinette COO Neutral 52.5 - 0.00% ✗ -
Oct 15, 2025 Oct 17, 2025 Samayoa Phillip CHIEF SCIENTIFIC OFFICER Sell 45.0 -34 -0.24% ✗ $228.1
Oct 15, 2025 Oct 17, 2025 MCDONOUGH GEOFF CEO Sell 52.5 -155 -0.08% ✗ $1K
Oct 15, 2025 Oct 17, 2025 Howze Yalonda CHIEF LEGAL OFFICER Sell 27.5 -99 -4.05% ✗ $664.3
Oct 15, 2025 Oct 17, 2025 Paone Antoinette COO Sell 27.5 -47 -1.27% ✗ $315.4
Oct 15, 2025 Oct 17, 2025 Conway Kevin John CFO Sell 37.5 -18 -0.95% ✗ $120.8
Jul 15, 2025 Jul 17, 2025 Howze Yalonda CHIEF LEGAL OFFICER Sell 27.5 -983 -4.45% ✗ $418.8
Jul 15, 2025 Jul 17, 2025 Conway Kevin John CFO Sell 37.5 -173 -0.94% ✗ $73.7
Jul 15, 2025 Jul 17, 2025 Paone Antoinette COO Sell 27.5 -468 -1.30% ✗ $199.4
Jul 15, 2025 Jul 17, 2025 Samayoa Phillip CHIEF SCIENTIFIC OFFICER Sell 45.0 -337 -0.24% ✗ $143.6
Jul 15, 2025 Jul 17, 2025 MCDONOUGH GEOFF CEO Sell 52.5 -1,548 -0.08% ✗ $659.5
Jun 4, 2025 Jun 6, 2025 Cooper Ronald Harold Wilfred Director Neutral 52.5 - 0.00% ✗ -
Jun 4, 2025 Jun 6, 2025 Christensen Gustav Director Neutral 52.5 - 0.00% ✗ -
Jun 4, 2025 Jun 6, 2025 Quinn Anthony G. Director Neutral 52.5 - 0.00% ✗ -
Jun 4, 2025 Jun 6, 2025 JONAS JEFFREY M Director Neutral 52.5 - 0.00% ✗ -
Jun 4, 2025 Jun 6, 2025 Nicholson Donald William Director Neutral 52.5 - 0.00% ✗ -
Jun 4, 2025 Jun 6, 2025 Stehman-Breen Catherine Director Neutral 52.5 - 0.00% ✗ -
Jun 4, 2025 Jun 6, 2025 Rhodes Jason P Director Neutral 52.5 - 0.00% ✗ -
Jun 4, 2025 Jun 6, 2025 Rowland Charles A Jr Director Neutral 52.5 - 0.00% ✗ -
Jun 4, 2025 Jun 6, 2025 Appelhans Dannielle Director Neutral 52.5 - 0.00% ✗ -
Apr 15, 2025 Apr 17, 2025 Samayoa Phillip CHIEF SCIENTIFIC OFFICER Sell 45.0 -337 -0.26% ✗ $124
Apr 15, 2025 Apr 17, 2025 MCDONOUGH GEOFF CEO Sell 52.5 -1,548 -0.08% ✗ $569.4
Apr 15, 2025 Apr 17, 2025 Paone Antoinette COO Sell 27.5 -468 -1.99% ✗ $172.1
Apr 15, 2025 Apr 17, 2025 Howze Yalonda CHIEF LEGAL OFFICER Sell 27.5 -983 -4.98% ✗ $361.6
Apr 15, 2025 Apr 17, 2025 Conway Kevin John CFO Sell 37.5 -173 -0.96% ✗ $63.6
Jan 15, 2025 Jan 17, 2025 Conway Kevin John CFO Sell 27.5 -204 -1.16% ✗ $181.2
Jan 15, 2025 Jan 17, 2025 Howze Yalonda CHIEF LEGAL OFFICER Sell 27.5 -1,160 -6.62% ✗ $1K
Jan 15, 2025 Jan 17, 2025 Samayoa Phillip CHIEF SCIENTIFIC OFFICER Sell 45.0 -398 -0.31% ✗ $353.4
Jan 15, 2025 Jan 17, 2025 Paone Antoinette COO Sell 27.5 -552 -2.45% ✗ $490.2
Jan 15, 2025 Jan 17, 2025 MCDONOUGH GEOFF CEO Sell 52.5 -1,828 -0.10% ✗ $1.6K
Jan 10, 2025 Jan 14, 2025 Conway Kevin John CFO Neutral 52.5 - 0.00% ✗ -
Jan 14, 2025 Conway Kevin John CFO Neutral 52.5 - 0.00% ✗ -
Jan 10, 2025 Jan 14, 2025 Quinn Anthony G. Director Buy 95.0 +210,791 238.20% ✗ $203.2K
Jan 10, 2025 Jan 14, 2025 Samayoa Phillip CHIEF SCIENTIFIC OFFICER Neutral 52.5 - 0.00% ✗ -
Jan 10, 2025 Jan 14, 2025 Paone Antoinette COO Neutral 52.5 - 0.00% ✗ -
Jan 10, 2025 Jan 14, 2025 MCDONOUGH GEOFF CEO Neutral 52.5 - 0.00% ✗ -
Jan 10, 2025 Jan 14, 2025 Howze Yalonda CHIEF LEGAL OFFICER Neutral 52.5 - 0.00% ✗ -
Jan 10, 2025 Norkunas Matthew CFO Neutral 52.5 - 0.00% ✗ -
Jan 10, 2025 Stanton Matthew CHIEF SCIENTIFIC OFFICER Neutral 52.5 - 0.00% ✗ -
Oct 15, 2024 Oct 17, 2024 Stanton Matthew CHIEF SCIENTIFIC OFFICER Sell 52.5 -492 -0.20% ✗ $1.2K
Oct 15, 2024 Oct 17, 2024 Samayoa Phillip CHIEF STRATEGY OFFICER Sell 45.0 -337 -0.28% ✗ $815.5
Oct 15, 2024 Oct 17, 2024 Norkunas Matthew CFO Sell 37.5 -984 -0.86% ✗ $2.4K
Oct 15, 2024 Oct 17, 2024 MCDONOUGH GEOFF CEO Sell 52.5 -1,548 -0.08% ✗ $3.7K
Oct 15, 2024 Oct 17, 2024 Paone Antoinette COO Sell 27.5 -468 -2.83% ✗ $1.1K
Oct 15, 2024 Oct 17, 2024 Howze Yalonda CHIEF LEGAL OFFICER Neutral 27.5 -983 -6.48% ✗ -
Jul 15, 2024 Jul 17, 2024 Howze Yalonda CHIEF LEGAL OFFICER Sell 27.5 -983 -7.68% ✗ $2.9K
Jul 15, 2024 Jul 17, 2024 MCDONOUGH GEOFF CEO Sell 52.5 -1,548 -0.08% ✗ $4.5K
Jul 15, 2024 Jul 17, 2024 Norkunas Matthew CFO Sell 37.5 -984 -0.90% ✗ $2.9K
Jul 15, 2024 Jul 17, 2024 Samayoa Phillip CHIEF STRATEGY OFFICER Sell 45.0 -337 -0.28% ✗ $987.4
Jul 15, 2024 Jul 17, 2024 Paone Antoinette COO Sell 27.5 -468 -3.04% ✗ $1.4K
Jul 15, 2024 Jul 17, 2024 Stanton Matthew CHIEF SCIENTIFIC OFFICER Sell 52.5 -492 -0.20% ✗ $1.4K
Jul 1, 2024 Jul 3, 2024 Paone Antoinette COO Sell 13.8 -6,719 -32.73% ✓ $18.4K
Jun 6, 2024 Jun 10, 2024 Rhodes Jason P Director Neutral 52.5 - 0.00% ✗ -
Jun 6, 2024 Jun 10, 2024 Stehman-Breen Catherine Director Neutral 52.5 - 0.00% ✗ -
Jun 6, 2024 Jun 10, 2024 Rowland Charles A Jr Director Neutral 52.5 - 0.00% ✗ -
Jun 6, 2024 Jun 10, 2024 Quinn Anthony G. Director Neutral 52.5 - 0.00% ✗ -
Jun 6, 2024 Jun 10, 2024 Cooper Ronald Harold Wilfred Director Neutral 52.5 - 0.00% ✗ -
Jun 6, 2024 Jun 10, 2024 Christensen Gustav Director Neutral 52.5 - 0.00% ✗ -
Jun 6, 2024 Jun 10, 2024 JONAS JEFFREY M Director Neutral 52.5 - 0.00% ✗ -
Jun 6, 2024 Jun 10, 2024 Nicholson Donald William Director Neutral 52.5 - 0.00% ✗ -
Jun 6, 2024 Jun 10, 2024 Appelhans Dannielle Director Neutral 52.5 - 0.00% ✗ -
Apr 15, 2024 Apr 17, 2024 Stanton Matthew CHIEF SCIENTIFIC OFFICER Sell 45.0 -492 -0.20% ✗ $1.8K
Apr 15, 2024 Apr 17, 2024 Samayoa Phillip CHIEF STRATEGY OFFICER Sell 45.0 -337 -0.30% ✗ $1.2K
Apr 15, 2024 Apr 17, 2024 Paone Antoinette COO Sell 27.5 -468 -3.28% ✗ $1.7K
Apr 15, 2024 Apr 17, 2024 Norkunas Matthew CFO Sell 37.5 -984 -0.94% ✗ $3.6K
Apr 15, 2024 Apr 17, 2024 MCDONOUGH GEOFF CEO Sell 52.5 -1,548 -0.08% ✗ $5.7K
Apr 15, 2024 Apr 17, 2024 Howze Yalonda CHIEF LEGAL OFFICER Sell 26.3 -3,930 -29.35% ✗ $14.5K
Jan 29, 2024 Jan 31, 2024 Zimmermann Tracy CHIEF DEVELOPMENT OFFICER Sell 27.5 -1,476 -2.91% ✗ $2.8K
Jan 29, 2024 Jan 31, 2024 Kerr Douglas CHIEF MEDICAL OFFICER Sell 45.0 -1,476 -0.38% ✗ $2.8K
Jan 15, 2024 Jan 17, 2024 Zimmermann Tracy CHIEF DEVELOPMENT OFFICER Sell 27.5 -4,897 -5.34% ✗ $9.4K
Jan 15, 2024 Jan 17, 2024 Kerr Douglas CHIEF MEDICAL OFFICER Sell 37.5 -4,897 -0.64% ✗ $9.4K
Jan 15, 2024 Jan 17, 2024 Stanton Matthew CHIEF SCIENTIFIC OFFICER Sell 27.5 -4,897 -1.00% ✗ $9.4K
Jan 15, 2024 Jan 17, 2024 Norkunas Matthew CFO Sell 26.3 -5,478 -3.66% ✗ $10.5K
Jan 15, 2024 Jan 17, 2024 MCDONOUGH GEOFF CEO Sell 43.8 -15,431 -0.49% ✗ $29.5K
Jan 15, 2024 Jan 17, 2024 Samayoa Phillip CHIEF STRATEGY OFFICER Sell 27.5 -3,020 -1.34% ✗ $5.8K
Jan 15, 2024 Jan 17, 2024 Paone Antoinette COO Sell 27.5 -3,637 -14.64% ✗ $6.9K
Jan 2, 2024 Jan 3, 2024 Paone Antoinette COO Sell 15.0 -2,445 -29.55% ✓ $4K
Jan 2, 2024 Jan 3, 2024 Stanton Matthew CHIEF SCIENTIFIC OFFICER Neutral 52.5 - 0.00% ✗ -
Jan 2, 2024 Jan 3, 2024 Samayoa Phillip CHIEF STRATEGY OFFICER Sell 46.3 -2,445 -2.23% ✓ $4K