Tectonic Therapeutic TECX Insider Ownership

NASDAQ TECX

$22.14 +0.31 (+1.44%)

As of: Oct 21, 2026 · 9:40 AM EDT

Insider Holdings by Owner

7.06Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

38.19%

▼-0.021% pp QoQ

Shares Held by Insiders

7.35Mn

filed for Sep 2026

▼-0.05% QoQ

Shares Outstanding

19.24Mn

19,235,221 shares

Direct Holdings

4.87Mn

Indirect: 2.48Mn

Net Shares Traded (QoQ)

-3.98K

net selling in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 10, 2026

Over the past year, TECX insiders bought $182,410 of stock (8.5K shares) and sold $651,007 (22.42K shares) on the open market.

Counted by insider, open-market buying of TECX stock in the past 12 months came from 2 insiders and selling from 2 insiders.
Among Tectonic Therapeutic's insiders, the largest open-market purchases in the past 12 months were by Daniel Lochner (Chief Financial Officer), totaling $129,660 (6K shares), most recently on February 10, 2026.
On the selling side, Marcella K. Ruddy (Chief Medical Officer) was the top open-market seller of Tectonic Therapeutic over the past 12 months, with $363,000 sold (12.06K shares) and the latest sale on May 4, 2026.
The latest open-market trade on record is a sale of 536 shares for $12,349 by Peter McNamara (Chief Scientific Officer) on September 30, 2026.
In transactions other than open-market trades, Tectonic Therapeutic insiders received 145.5K shares in stock awards, acquired 25.44K shares through option exercises and conversions and gave up 15.98K shares to cover taxes or exercise prices over the past 12 months.
According to Business Quant data, insiders at Tectonic Therapeutic reported 7.35Mn shares in total in their latest Form 4 filings, or 38.19% of the 19.24Mn shares outstanding; that total is down 0.05% from 7.35Mn shares at the end of Q2 2026 and up 1.53% from 7.23Mn shares at the end of Q3 2025.
Tectonic Therapeutic insiders hold 4.87Mn shares directly (66.28% of their total) and 2.48Mn shares (33.72%) indirectly, through entities such as trusts and partnerships.
Per Business Quant, 9 insiders of TECX hold shares, counting officers, directors and 10% owners who have filed a Form 4 in the past two years.
TECX's largest insider holders by reported holdings are Timothy A. Springer (Director and 10% owner, 6.02Mn shares), Terrance McGuire (Director, 657.98K shares) and Alise Reicin (Chief Executive Officer, 436.11K shares).
The largest insider, Timothy A. Springer, holds 82.02% of TECX's insider total.
Over the past 12 months, 11 insiders reported transactions in Tectonic Therapeutic stock in 41 Form 4 filings.
This summary of Tectonic Therapeutic insider activity covers Form 4 filings through October 2, 2026.

Form 4 Holdings

Insiders Holding TECX

Insiders 16

Shares held 7.06Mn

Of outstanding 36.69%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Timothy A Springer	Director, TenPercentOwner	4,334,846	1,503,358	5,838,204	82.7%	11 Apr, 2025
2	Terrance Mcguire	Director	0	573,062	573,062	8.1%	07 Apr, 2025
3	Alise Reicin	Chief Executive Officer	309,078	0	309,078	4.4%	02 Oct, 2026
4	Marcella K. Ruddy	Chief Medical Officer	67,157	0	67,157	1.0%	02 Oct, 2026
5	Daniel Lochner	Chief Financial Officer	58,024	0	58,024	0.8%	02 Oct, 2026
6	Peter Mcnamara	Chief Scientific Officer	54,305	0	54,305	0.8%	02 Oct, 2026
7	Geoffrey Mackay	President Ceo	15,667	37,092	52,759	0.7%	26 Jan, 2023
8	Marc Schwabish	Chief Business Officer	44,903	0	44,903	0.6%	02 Oct, 2026
9	Braden Michael Leonard	Other	2,778	33,362	36,139	0.5%	25 Jun, 2024
10	Christian Cortis	Chief Operating Officer	10,530	0	10,530	0.1%	24 Jun, 2024
11	Azadeh Golipour	Chief Technology Officer	4,656	0	4,656	0.1%	05 Feb, 2024
12	Erik Ostrowski	Interim Ceo, President And Cfo	2,440	0	2,440	0.0%	05 Feb, 2024
13	Stefan Vitorovic	Director	0	2,314	2,314	0.0%	24 Jun, 2024
14	Steven Avruch	Chief Legal Officer	1,835	0	1,835	0.0%	05 Feb, 2024
15	Essra Ridha	Chief Medical Officer	1,323	0	1,323	0.0%	05 Feb, 2024
16	Praveen P. Tipirneni	Director	253	0	253	0.0%	24 Jun, 2024

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

320 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
25 Sep, 2026	Marcella K. Ruddy	Chief Medical Officer	Disposed F	525	$23.67	$12.43K	67,157	Direct
25 Sep, 2026	Peter Mcnamara	Chief Scientific Officer	Disposed F	444	$23.67	$10.51K	54,841	Direct
25 Sep, 2026	Marc Schwabish	Chief Business Officer	Disposed F	411	$23.67	$9.73K	44,903	Direct
25 Sep, 2026	Alise Reicin	Chief Executive Officer	Disposed F	1,545	$23.67	$36.57K	309,078	Direct
25 Sep, 2026	Daniel Lochner	Chief Financial Officer	Disposed F	520	$23.67	$12.31K	58,024	Direct
30 Sep, 2026	Peter Mcnamara	Chief Scientific Officer	Disposed S	536	$23.04	$12.35K	54,305	Direct
03 Sep, 2026	Daniel Lochner	Chief Financial Officer	Acquired A	24,250	$0.00	$0	24,250	Direct
03 Sep, 2026	Alise Reicin	Chief Executive Officer	Acquired A	69,250	$0.00	$0	69,250	Direct
03 Sep, 2026	Marcella K. Ruddy	Chief Medical Officer	Acquired A	24,250	$0.00	$0	24,250	Direct
03 Sep, 2026	Peter Mcnamara	Chief Scientific Officer	Acquired A	21,000	$0.00	$0	21,000	Direct
03 Sep, 2026	Marc Schwabish	Chief Business Officer	Acquired A	17,750	$0.00	$0	17,750	Direct
25 Aug, 2026	Peter Mcnamara	Chief Scientific Officer	Acquired M	43	$14.71	$633	55,328	Direct
25 Aug, 2026	Peter Mcnamara	Chief Scientific Officer	Disposed S	43	$36.52	$1.57K	55,285	Direct
25 Aug, 2026	Peter Mcnamara	Chief Scientific Officer	Disposed M	43	$0.00	$0	7,787	Direct
12 Aug, 2026	Peter Mcnamara	Chief Scientific Officer	Acquired M	43	$14.71	$633	55,328	Direct
12 Aug, 2026	Peter Mcnamara	Chief Scientific Officer	Disposed S	43	$35.00	$1.51K	55,285	Direct
12 Aug, 2026	Peter Mcnamara	Chief Scientific Officer	Disposed M	43	$0.00	$0	7,830	Direct
30 Jun, 2026	Peter Mcnamara	Chief Scientific Officer	Acquired M	172	$14.71	$2.53K	55,457	Direct
30 Jun, 2026	Peter Mcnamara	Chief Scientific Officer	Disposed S	172	$35.00	$6.02K	55,285	Direct
30 Jun, 2026	Peter Mcnamara	Chief Scientific Officer	Disposed M	172	$0.00	$0	7,873	Direct

Showing 1 to 20 of 320 transactions