Tectonic Therapeutic TECX Insider Ownership

NASDAQ TECX
$29.93 +0.01 (+0.03%)
As of: Sep 4, 2026 · 10:50 AM EDT

Insider Holdings by Owner

7.79Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026
Insider Ownership
2.34%
0% pp QoQ
Shares Held by Insiders
437.65K
filed for Sep 2026
0.00% QoQ
Shares Outstanding
18.71Mn
18,712,767 shares
Direct Holdings
310.62K
Indirect: 127.03K
Net Shares Traded (QoQ)
0
no net change in Sep 2026
Insiders Holding Shares
17
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

Quarter ending 30 Sep, 2026

As of August 29, 2026, the three largest insider holders of TECX are Timothy A Springer (Director, 5.84Mn shares), Geoffrey Mackay (President Ceo, 633.13K shares), Terrance Mcguire (Director, 573.06K shares).

Form 4 Holdings

Insiders Holding TECX

Insiders 17
Shares held 7.79Mn
Of outstanding 41.61%
# 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 75.0% 11 Apr, 2025
2 Geoffrey Mackay President Ceo 188,012 445,123 633,135 8.1% 26 Jan, 2023
3 Terrance Mcguire Director 0 573,062 573,062 7.4% 07 Apr, 2025
4 Alise Reicin Chief Executive Officer 310,623 0 310,623 4.0% 23 Jun, 2026
5 Marcella K. Ruddy Chief Medical Officer 67,682 0 67,682 0.9% 06 May, 2026
6 Daniel Lochner Chief Financial Officer 58,544 0 58,544 0.8% 05 Mar, 2026
7 Azadeh Golipour Chief Technology Officer 55,872 0 55,872 0.7% 05 Feb, 2024
8 Peter Mcnamara Chief Scientific Officer 55,285 0 55,285 0.7% 26 Aug, 2026
9 Marc Schwabish Chief Business Officer 45,314 0 45,314 0.6% 05 Mar, 2026
10 Braden Michael Leonard Other 2,778 33,362 36,139 0.5% 25 Jun, 2024
11 Erik Ostrowski Interim Ceo, President And Cfo 29,285 0 29,285 0.4% 05 Feb, 2024
12 Stefan Vitorovic Director 0 27,774 27,774 0.4% 24 Jun, 2024
13 Steven Avruch Chief Legal Officer 22,022 0 22,022 0.3% 05 Feb, 2024
14 Essra Ridha Chief Medical Officer 15,881 0 15,881 0.2% 05 Feb, 2024
15 Christian Cortis Chief Operating Officer 10,530 0 10,530 0.1% 24 Jun, 2024
16 Philip J. Vickers Director 4,800 0 4,800 0.1% 08 Jul, 2021
17 Praveen P. Tipirneni Director 3,037 0 3,037 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

549 Insider Transactions

Source SEC Form 4
Latest quarter Sep 2026
Download Data
Date Insider Position Transaction Shares Price Value Shares Held After Ownership
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
20 Jun, 2026 Alise Reicin Chief Executive Officer Disposed F 924 $30.34 $28.03K 310,623 Direct
11 Jun, 2026 Daniel Lochner Chief Financial Officer Acquired A 7,500 $0.00 $0 7,500 Direct
09 Jun, 2026 Timothy A Springer Director, TenPercentOwner Acquired A 10,200 $0.00 $0 10,200 Direct
08 Jun, 2026 Jessica Caroline Chutter Director Acquired A 20,400 $0.00 $0 20,400 Direct
09 Jun, 2026 Praveen P. Tipirneni Director Acquired A 10,200 $0.00 $0 10,200 Direct
09 Jun, 2026 Phillip B. Donenberg Director Acquired A 10,200 $0.00 $0 10,200 Direct
09 Jun, 2026 Stefan Vitorovic Director Acquired A 10,200 $0.00 $0 10,200 Direct
04 May, 2026 Marcella K. Ruddy Chief Medical Officer Disposed S 1,065 $30.00 $31.95K 67,682 Direct
01 Apr, 2026 Marcella K. Ruddy Chief Medical Officer Disposed S 1,000 $31.05 $31.05K 68,747 Direct
01 Apr, 2026 Francois Nader Director Acquired A 20,400 $0.00 $0 20,400 Direct
06 Mar, 2026 Marcella K. Ruddy Chief Medical Officer Disposed S 10,000 $30.00 $300.00K 69,747 Direct