Tectonic Therapeutic, Inc.
Ownership
Ownership Structure
Who owns Tectonic Therapeutic, Inc. (TECX)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 60.8% of the shares are freely tradable; institutional investors hold 74.2%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| FMR Inc | 14.48 | 2,830,378 | +0.5 | 06/30/2026 |
| TCG Crossover Management, LLC | 6.16 | 1,204,891 | +0.0 | 06/30/2026 |
| Aberdeen Group PLC | 5.84 | 1,141,824 | +0.0 | 06/30/2026 |
| BlackRock Inc | 4.41 | 862,592 | +0.3 | 06/30/2026 |
| First Light Asset Management, LLC | 4.10 | 800,726 | +23.6 | 06/30/2026 |
| Baker Bros Advisors LP | 3.11 | 607,788 | +0.0 | 06/30/2026 |
| 5AM Venture Management, LLC | 3.10 | 606,660 | +0.0 | 06/30/2026 |
| BRAIDWELL LP | 3.05 | 596,900 | -29.5 | 06/30/2026 |
| Vanguard Capital Management, LLC | 2.50 | 488,805 | +3.2 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Fidelity Growth Company Fund | 3.86 | 754,390 | +4.9 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Reicin Alise | Chief Executive Officer | 319,078 | 6,573,007 $ | Oct 26, 2026 | direct |
| Ruddy Marcella K. | Chief Medical Officer | 67,157 | 1,383,434 $ | Sep 25, 2026 | direct |
| Lochner Daniel | Chief Financial Officer | 58,024 | 1,195,294 $ | Sep 25, 2026 | direct |
| McNamara Peter | Chief Scientific Officer | 54,305 | 1,118,683 $ | Sep 30, 2026 | direct |
| Schwabish Marc | Chief Business Officer | 44,903 | 925,002 $ | Sep 25, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 26, 2026 | Reicin Alise | Chief Executive Officer | Other | 10,000 | 2.38 | 23,800 |
| Sep 30, 2026 | McNamara Peter | Chief Scientific Officer | Sell | 536 | 23.04 | 12,349 |
| Sep 25, 2026 | Ruddy Marcella K. | Chief Medical Officer | Other | 525 | 23.67 | 12,427 |
| Sep 25, 2026 | McNamara Peter | Chief Scientific Officer | Other | 444 | 23.67 | 10,509 |
| Sep 25, 2026 | Schwabish Marc | Chief Business Officer | Other | 411 | 23.67 | 9,728 |
| Sep 25, 2026 | Lochner Daniel | Chief Financial Officer | Other | 520 | 23.67 | 12,308 |
| Sep 25, 2026 | Reicin Alise | Chief Executive Officer | Other | 1,545 | 23.67 | 36,570 |
| Aug 25, 2026 | McNamara Peter | Chief Scientific Officer | Sell | 43 | 36.52 | 1,570 |
| Aug 25, 2026 | McNamara Peter | Chief Scientific Officer | Other | 43 | 14.71 | 633 |
| Aug 12, 2026 | McNamara Peter | Chief Scientific Officer | Sell | 43 | 35.00 | 1,505 |
| Aug 12, 2026 | McNamara Peter | Chief Scientific Officer | Other | 43 | 14.71 | 633 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 6, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.