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TECX · NASDAQ · Biotechnology

Tectonic Therapeutic (TECX)

Develops GPCR-targeted biologics for pulmonary vascular and rare vascular diseases.

$30.39

Pre-market+0.01 (+0.03%)

At close$30.38(−2.69%)

Watchlist

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Breakdown13F · 13D/G · Form 4

Institutions128 holders · as of Jun 30, 2026 · largest filers plus last quarter's tail	≈ 71.58%	13.99M shares
Insiders7 holders · as of Aug 26, 2026	37.15%	7.26M shares
Strategic holders2 holders · as of Jan 29, 2026	11.10%	2.17M shares
Adds to	119.83%

19.55M company shares as of Sep 3, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing

This quarter's institutional total failed a plausibility check; shown: the largest filers plus last quarter's remainder.

These groups come from separate filings that can overlap, so they add to 119.83%; nothing is left for Other.

Top shareholders13F · 13D/G · Form 4

Holder	Stake	Shares	Evidence
Timothy A. Springer^1,2Insiderdirector, 10 percent owner	30.82%	4.24M	13Dfiled Apr 11, 2025 ↗
FMR LLCInstitution	14.48%	2.83M	13Fas of Jun 30, 2026
TCG Crossover Management, LLCInstitution	6.16%	1.20M	13Fas of Jun 30, 2026
Abrdn PLCInstitution	5.84%	1.14M	13Fas of Jun 30, 2026
Aberdeen Group plcStrategic	5.84%	1.14M	13Gfiled Jan 29, 2026 ↗
VV Manager II, LLCStrategic	5.26%	1.03M	13Dfiled Jun 27, 2024 ↗
BlackRock, Inc.Institution	4.41%	862,592	13Fas of Jun 30, 2026
First Light Asset Management, LLCInstitution	4.10%	800,726	13Fas of Jun 30, 2026
Baker Bros. Advisors LPInstitution	3.11%	607,788	13Fas of Jun 30, 2026
5Am Venture Management, LLCInstitution	3.10%	606,660	13Fas of Jun 30, 2026
Braidwell LPInstitution	3.05%	596,900	13Fas of Jun 30, 2026
Terrance McguireInsiderdirector	2.93%	573,062	Form 4filed Apr 7, 2025 ↗
Vanguard Capital Management LLCInstitution	2.50%	488,805	13Fas of Jun 30, 2026
Alise ReicinInsiderdirector, officer: Chief Executive Officer	2.24%	437,653	Form 4filed Jun 23, 2026 ↗
Vestal Point Capital, LPInstitution	2.17%	425,000	13Fas of Jun 30, 2026
Bollard Group LLCInstitution	1.55%	302,953	13Fas of Jun 30, 2026
Kennedy Capital Management LLCInstitution	1.44%	282,202	13Fas of Jun 30, 2026
Geode Capital Management, LLCInstitution	1.38%	270,461	13Fas of Jun 30, 2026
Orbimed Advisors LLCInstitution	1.16%	226,600	13Fas of Jun 30, 2026
State Street CorpInstitution	1.12%	219,908	13Fas of Jun 30, 2026
Ikarian Capital, LLCInstitution	1.05%	205,837	13Fas of Jun 30, 2026
D. E. Shaw & Co., Inc.Institution	0.95%	186,550	13Fas of Jun 30, 2026
Marshall Wace, LLPInstitution	0.88%	172,101	13Fas of Jun 30, 2026
Millennium Management LLCInstitution	0.85%	165,525	13Fas of Jun 30, 2026
Squarepoint Ops LLCInstitution	0.74%	145,028	13Fas of Jun 30, 2026

Timothy A. Springer's transaction reports restate only vehicles that traded; the 2024 ownership statement (4.24M) plus the 1.78M net shares acquired since is used instead.
Timothy A. Springer reports a block also reported by another filer; it is counted once, under that filer.

13F — a manager's quarterly holdings · 13D/13G — an ownership statement filed at 5% or more · Form 4 — an insider's transaction report

Institutions13F, as of Jun 30, 2026

128 holders · 13.99M shares · 25 new positions · 65 increased · 42 reduced · 12 closed

Holder	Shares	% outstanding	Chg q/q	Filed
FMR LLC	2.83M	14.48%	+13.9K	Aug 13, 2026
TCG Crossover Management, LLC	1.20M	6.16%	0	Aug 14, 2026
Abrdn PLC	1.14M	5.84%	0	Jul 31, 2026
BlackRock, Inc.	862.6K	4.41%	+2.2K	Aug 7, 2026
First Light Asset Management, LLC	800.7K	4.10%	+153.0K	Aug 14, 2026
Baker Bros. Advisors LP	607.8K	3.11%	0	Aug 14, 2026
5Am Venture Management, LLC	606.7K	3.10%	0	Aug 14, 2026
Braidwell LP	596.9K	3.05%	−250.3K	Aug 14, 2026

Ownership statements13D/G · 5% or more, as filed

Holder	% of class	Shares	Form	Filed
FMR LLC	15.00%	2.80M	13G	May 12, 2025 ↗
Aberdeen Group plc	6.10%	1.14M	13G	Jan 29, 2026 ↗

Insider tradesForm 4

Latest trades

Date	Insider	Type	Shares	Avg price	Owned after
Aug 25, 2026	Peter McNamaraofficer: Chief Scientific Officer	Sale	43	$36.52	55,285
Aug 12, 2026	Peter McNamaraofficer: Chief Scientific Officer	Sale	43	$35.00	55,285
Jun 30, 2026	Peter McNamaraofficer: Chief Scientific Officer	Sale	172	$35.00	55,285
May 4, 2026	Marcella K. Ruddyofficer: Chief Medical Officer	Sale	1,065	$30.00	67,682
Apr 1, 2026	Marcella K. Ruddyofficer: Chief Medical Officer	Sale	1,000	$31.05	68,747
Mar 6, 2026	Peter McNamaraofficer: Chief Scientific Officer	Sale · 2 lots	6,262	$30.17	55,285
Mar 6, 2026	Marcella K. Ruddyofficer: Chief Medical Officer	Sale	10,000	$30.00	69,747
Feb 11, 2026	Alise Reicindirector, officer: Chief Executive Officer	Purchase · 2 lots	5,000	$21.10	364,577
Mar 3, 2026	Peter McNamaraofficer: Chief Scientific Officer	Sale	1,649	$22.06	37,482
Mar 4, 2026	Peter McNamaraofficer: Chief Scientific Officer	Sale	1,650	$25.00	58,832

CongressHouse and Senate disclosures

Not reported.