Tectonic Therapeutic, Inc. (TECX)
Nasdaq: TECX · Biological Products, (No Diagnostic Substances) · Watertown, MA · filing with the SEC since 2016
Who owns Tectonic Therapeutic, Inc.
As filed with the SECHolders of 5% or more
6
Timothy A. Springer holds 31.5% of Common Stock, $0.0001 par value per share, as its SCHEDULE 13D/A filed Apr 7, 2025 says.
Directors and officers
11
report now, of 32 people on the record since 2018. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 6 named at left.
Holders of 5% or moreshare of the class, as filed
Timothy A. Springer
SCHEDULE 13D/A · filed Apr 7, 2025 · Common Stock, $0.0001 par value per share · 29.2% in Feb 10, 2025
Fmr LLC
SCHEDULE 13G/A · filed May 12, 2025 · COMMON STOCK · 10.3% in Jan 8, 2025
ADAR1 Partners, LP
SCHEDULE 13G · filed Feb 23, 2024 · Common Stock, $0.0001 par value per share
Terrance McGuire
SCHEDULE 13D/A · filed Apr 7, 2025 · Common Stock, $0.0001 par value per share · 6.3% in Feb 7, 2025
Chen Yu
SCHEDULE 13G · filed Feb 27, 2026 · Common Stock, $0.0001 par value per share
Aberdeen Group plc
SCHEDULE 13G · filed Jan 29, 2026 · Common Stock, $0.0001 par value per share
Deep Track Capital, LP
SCHEDULE 13G/A · filed Nov 14, 2025 · Common Stock $0.0001 par value per share · reported falling below 5%, from 7.6% in Feb 10, 2025
EcoR1 Capital, LLC
SCHEDULE 13G/A · filed Nov 14, 2025 · Common Stock · reported falling below 5%, from 5% in May 15, 2025
Vida Ventures II, LLC
SCHEDULE 13D/A · filed Apr 7, 2025 · Common Stock, $0.0001 par value per share · reported falling below 5%, from 5.6% in Feb 7, 2025
BML Investment Partners, L.P.
SCHEDULE 13G/A · filed Feb 13, 2025 · Common Stock, $0.0001 par value per share · reported falling below 5%
What TECX reports owning in othersstakes of 5% or more, and other ties
4 subsidiaries in 3 countries, from the list filed with the 10-K filed Feb 26, 2026.
Insider tradesForm 4
11sales
3purchases
11sales on a scheduled plan
2people selling
$700,000sold, in dollars
$200,000bought, in dollars
Open-market trades on Form 4 from Oct 28, 2025 to Oct 28, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Oct 28, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window4 of 52 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Ruddy Marcella K. | Chief Medical Officer | 3 | $400,000 | 3 | 0 | $0 |
| Mcnamara Peter | Chief Scientific Officer | 8 | $300,000 | 8 | 0 | $0 |
| Reicin Alise | Chief Executive Officer | 0 | $0 | 0 | 2 | $100,000 |
| Lochner Daniel | Chief Financial Officer | 0 | $0 | 0 | 1 | $100,000 |