Tectonic Therapeutic, Inc. - Common Stock, $0.0001 par value per share (TECX)

Q: What does CUSIP 878972108 represent in this 13F holders report?

CUSIP 878972108 is the security identifier for TECX - Tectonic Therapeutic, Inc. - Common Stock, $0.0001 par value per share used to aggregate holder disclosures.

Q: How many institutions held TECX - Tectonic Therapeutic, Inc. - Common Stock, $0.0001 par value per share in Q1 2025?

78 institutional investors reported TECX - Tectonic Therapeutic, Inc. - Common Stock, $0.0001 par value per share for Q1 2025. Use the holders table for investor-level position and value details.

CUSIP: 878972108

Q1 2025 13F Holders as of 31 Mar 2025

Security type / class: Equity / Common Stock, $0.0001 par value per share
Total 13F shares: 11,227,627
Total 13F value: $198,820,413
Share change: +3,538,334
SEC-reported price per share: $17.71
Number of holders: 78
Value change: +$3,981,198
Number of buys: 58
Number of sells: 34
Shares outstanding: 18,867,097

Security key

878972108

Report period

Q1 2025

Institutions

Top holders

TECX full security history Ownership snapshot Full 13F holder table Tectonic Therapeutic, Inc. SEC filings Tectonic Therapeutic, Inc. company facts

Broader feeds

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Ownership snapshot

Top reported holders of TECX - Tectonic Therapeutic, Inc. - Common Stock, $0.0001 par value per share (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

FMR LLC

Disclosed value leader

FMR LLC

Comparable rows

15/15

Latest evidence

31 Dec 2024

13F 13D/G Lead comparable stake: 15% 13D/G row: FMR LLC Showing 1-6 of 15 holder rows.

Quick read

FMR LLC leads the comparable SEC ownership view at 15%.

15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens FMR LLC's linked filing trail.

Comparable ownership Top 5

FMR LLC 15%

Vida Ventures Advisors, LLC 5.5%

EcoR1 Capital, LLC 4.5%

FARALLON CAPITAL MANAGEMENT, L.L.C. 3.8%

5AM Venture Management, LLC 3.2%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
FMR LLC	13F 13D/G Company 13F 13D/G	15% from 13D/G	$70,009,186 1,516,335 shares	—	31 Dec 2024
Vida Ventures Advisors, LLC	13F Company 13F	5.5%	$47,493,879 1,028,674 shares	—	31 Dec 2024
EcoR1 Capital, LLC	13F Company 13F	4.5%	$39,204,932 849,143 shares	—	31 Dec 2024
FARALLON CAPITAL MANAGEMENT, L.L.C.	13F Company 13F	3.8%	$32,921,519 713,050 shares	—	31 Dec 2024
5AM Venture Management, LLC	13F Company 13F	3.2%	$27,547,792 596,660 shares	—	31 Dec 2024
Paradigm Biocapital Advisors LP	13F Company 13F	2.6%	$22,397,298 485,105 shares	—	31 Dec 2024

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q1 2025

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

11,227,627

Rows available

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q1 2025 vs Q1 2025 Across Filers

Q1 2025 holders

Holder diff

Investor	Q1 2025 Shares	Q1 2025 Shares	Share Diff	Share Chg %	Q1 2025 value	Q1 2025 value	Value change	Value Chg %