Tectonic Therapeutic TECX Institutional Ownership

Updated Oct 11, 2026

Tectonic Therapeutic, Inc. (NASDAQ:TECX) was held by 124 institutional investors that filed 13F reports for the quarter ended June 30, 2026.

• Collectively, these holders controlled 72.61% of Tectonic Therapeutic's outstanding shares in Q2 2026, down from 72.93% in Q1 2026.
• Total shares held in Tectonic Therapeutic rose 1.70% versus Q1 2026, while the number of holders rose 56.96% versus Q2 2025.
• Of these 124 holders, 66 added to their positions, 39 reduced their stakes and 19 left their positions unchanged.
• Combined, institutional investors held 13.97Mn shares of TECX as of Q2 2026, up 233.78K from the prior quarter and up 2.41Mn from a year earlier.
• As of June 30, 2026, the biggest holder of Tectonic Therapeutic was FMR LLC with 2.83Mn shares, or 14.71% of shares outstanding.
• Among existing holders, the largest additions to Tectonic Therapeutic in Q2 2026 came from First Light Asset Management, LLC (+152.98K shares), Millennium Management LLC (+107.18K shares), Vestal Point Capital, LP (+97K shares), D. E. Shaw & Co., Inc. (+70.43K shares) and Sectoral Asset Management Inc (+51.95K shares).
• Holders that trimmed the most shares of Tectonic Therapeutic in Q2 2026 while keeping a position were Braidwell LP (-250.25K shares), T. Rowe Price Associates Inc (-116.05K shares), Marshall Wace, LLP (-57.49K shares), ExodusPoint Capital Management, LP (-48.44K shares) and Soleus Capital Management, L.P. (-20K shares).
• Per Business Quant data, the 10 largest holders of Tectonic Therapeutic at the end of Q2 2026 were FMR LLC (2.83Mn shares), TCG Crossover Management, LLC (1.2Mn shares), Aberdeen Group plc (1.14Mn shares), BlackRock, Inc. (862.59K shares), First Light Asset Management, LLC (800.73K shares), Baker Bros. Advisors LP (607.79K shares), 5AM Venture Management, LLC (606.66K shares), Braidwell LP (596.9K shares), Vanguard Capital Management LLC (488.81K shares) and Vestal Point Capital, LP (425K shares).