$TECX

$20.34 +$0.39 (1.95%) Close

$TECX Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 19.5M shares outstanding

Who owns TECX?

By type of holder

Institutions 71.4% Insiders 28.6% Everyone else 0.0%

Concentration Top 10 holders own 73.7%

Timothy A. Springer 22.1% · FMR LLC 14.5%

Institutional ownership

71.4%

+0.8 pts vs last qtr

Institutional holders

122

+11 vs last qtr

Net shares bought

+153.4K

by institutions in Q2 2026

New / sold out

24 / 13

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

First Light Asset Management, LLC +153.0K
Millennium Management LLC +107.2K

Biggest sellers in Q2 2026

Braidwell LP −250.3K
Opaleye Management Inc. SOLD OUT −123.0K

Who is planning to sell?

Notices of proposed sale, last 12 months

$1.27M

9 notices from 3 people

Shares covered

40.1K

0.21% of the company

Arranged in advance

48%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Terrance Mcguire Former director $660K
Marcella Ruddy Officer 10b5-1 $336K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2024–FY2025

+115.8%

+115.81% a year

Each share's claim on the business

−53.7%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $14M

over 2 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years16% 3–5 years0% 1–3 years40% Under 1 year44%

Quarterly turnover

7.0%

of institutional shares changed hands

Top 10 managers, median time held

1.3 years

Super Investors

Investment managers reporting TECX on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
F FMR LLC	2.8M	14.48%	+13.9K (+0.5%)	2024	0.0%
Shares held by quarter Peak holding2.8M (Q2'26) Change over 8 quarters+1.6M Share of the company14.480% FMR LLC's full portfolio →
TC TCG Crossover Management, LLC	1.2M	6.16%	Unchanged	Q1 '26	1.0%
Shares held by quarter Peak holding1.2M (Q1'26) Change over 8 quarters+1.2M Share of the company6.160% TCG Crossover Management, LLC's full portfolio →

FMR LLC

2.8M

% of company

14.48%

Change vs last qtr

+13.9K (+0.5%)

Held since

2024

TCG Crossover Management, LLC

1.2M

% of company

6.16%

Change vs last qtr

Unchanged

Held since

Q1 '26

28 more super investors behind a free account

See every manager holding Tectonic Therapeutic, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting TECX on Form N-PORT; together they hold 23.7% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
AH abrdn Healthcare Investors abrdn Healthcare Investors	$26.5M	770.9K	3.94%	1.95%	June 30, 2026
FG Fidelity Growth Company Fund Fidelity Mt. Vernon Street Trust	$22.6M	754.4K	3.86%	0.02%	August 31, 2026

abrdn Healthcare Investors

Position value

$26.5M

% of company

3.94%

% of the fund

1.95%

As of

June 30, 2026

Fidelity Growth Company Fund

Fidelity Mt. Vernon Street Trust

Position value

$22.6M

% of company

3.86%

% of the fund

0.02%

As of

August 31, 2026

23 more funds behind a free account

See every fund holding Tectonic Therapeutic, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
TA Timothy A. Springer 5%+ holder 13D · 31.5%	4.3M	22.06%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company22.060% Disclosed stake13D · 31.5% View the 13D/G filing →
TP TAS Partners LLC 5%+ holder 13D · 7.4%	1.4M	7.07%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company7.070% Disclosed stake13D · 7.4% View the 13D/G filing →

Timothy A. Springer

5%+ holder13D · 31.5%

4.3M

% of company

22.06%

Change vs last qtr

—

Held since

—

TAS Partners LLC

5%+ holder13D · 7.4%

1.4M

% of company

7.07%

Change vs last qtr

—

Held since

—

9 more holders behind a free account

See every insider and 5%+ holder of Tectonic Therapeutic, Inc..

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