Marcella K. Ruddy

Companies

• Sionna Therapeutics, Inc.Board member Feb 6, 2025 to now¹
• Upstream Bio, Inc.Board member Oct 10, 2024 to now²
• Tectonic Therapeutic, Inc.Chief Medical Officer Jun 24, 2024 to now³

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• TTTectonic Therapeutic, Inc. TECX67,682 shares⁴$1.4M at $21.36May 4, 2026

As of each latest filing. The line shows shares held over time.

Recent filings

• May 4, 2026Sold 1,065 shares at $30.00 of Tectonic Therapeutic, Inc.⁴
• Apr 1, 2026Sold 1,000 shares at $31.05 of Tectonic Therapeutic, Inc.⁵
• Mar 6, 2026Sold 10,000 shares at $30.00 of Tectonic Therapeutic, Inc.⁶
• Mar 4, 2026Granted 26,500 shares of Tectonic Therapeutic, Inc.⁷
• Feb 4, 2026Shares withheld for tax 2,064 shares at $23.22 of Tectonic Therapeutic, Inc.⁸
• Sep 25, 2025Granted 5,370 shares of Tectonic Therapeutic, Inc.⁹
• Feb 4, 2025Granted 17,876 shares of Tectonic Therapeutic, Inc.¹⁰
• Jun 20, 2024Granted 32,065 shares of Tectonic Therapeutic, Inc.¹¹