Tectonic Therapeutic, Inc. (TECX) Institutional Ownership

Ownership Summary

A total of 99 institutions have reported a stake in Tectonic Therapeutic, Inc. (NASDAQ:TECX) as of September 2025, according to recent 13F filings with the SEC.

• These investors collectively held 65.2% of the company's total shares outstanding in September 2025, up from 62.8% in June 2025.
• Quarterly data indicates a 28.11% shift in institutional share volume, and the annual owner count reflects an increase of 94.12%.
• During the quarter, 53 institutions bought more Tectonic Therapeutic shares, 24 sold shares, and 22 of the 99 total investors held their position steady.
• The aggregate institutional position in Tectonic Therapeutic now stands at 12.19Mn shares as of September 2025, after investors increased their holdings (up by 2.68Mn shares quarter on quarter which is up 5.02Mn shares year over year).
• The top institutional stake in Tectonic Therapeutic as of September 30, 2025 belongs to FMR LLC, which owns 2.81Mn shares, or 15.00% of the company.
• Among the most significant buyers of Tectonic Therapeutic during September 2025 were BRAIDWELL LP (736.87K), Aberdeen Group plc (356.18K), Pale Fire Capital SE (259.73K), KENNEDY CAPITAL MANAGEMENT LLC (208.78K), CITADEL ADVISORS LLC (204.91K).
• Leading sellers of Tectonic Therapeutic stock in September 2025 included FARALLON CAPITAL MANAGEMENT LLC (213.05K), Woodline Partners LP (121.64K), Prosight Management, LP (62.80K), MORGAN STANLEY (55.70K), Soleus Capital Management, L.P. (51.84K).
• The top 10 institutional holders of Tectonic Therapeutic for the quarter ending September 2025 included FMR LLC (2.81Mn), BlackRock, Inc. (827.85K), BRAIDWELL LP (736.87K), FARALLON CAPITAL MANAGEMENT LLC (640.00K), VANGUARD GROUP INC (569.48K), 5AM Venture Management, LLC (511.66K), Point72 Asset Management, L.P. (421.75K), Prosight Management, LP (379.25K), Aberdeen Group plc (356.18K), Bollard Group LLC (302.95K).