🕵️ Tectonic Therapeutic, Inc. ($TECX)
SEC insider & ownership activity, last 12 months · CIK 1681087 · every row links its SEC filing
Over the last 12 months insiders sold $636K against $182K of open-market buying. Marcella K. Ruddy sold $363K through a 10b5-1 trading plan in 3 lots (Mar–May). Timothy A. Springer added 29.2% → 31.5%; TAS Partners LLC added 5.3% → 7.4%. No red-flag 8-Ks in the window.
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Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
2 buyers, $182K (2 lots) · 2 sellers, $636K (8 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Marcella K. Ruddy | 0 | – | 3 | $363K | May 4, 2026 |
| McNamara Peter | 0 | – | 5 | $273K | Jun 30, 2026 |
| Lochner Daniel | 1 | $130K | 0 | – | Feb 10, 2026 |
| Reicin Alise | 1 | $53K | 0 | – | Feb 11, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Timothy A. Springer | 31.5% | 13D | Apr 3, 2025 | filing ↗ | |
| FMR LLC | 15.0% | 13G | May 12, 2025 | filing ↗ | |
| Abigail P. Johnson | 15.0% | 13G | May 12, 2025 | filing ↗ | |
| TAS Partners LLC | 7.4% | 13D | Apr 3, 2025 | filing ↗ | |
| Terrance McGuire | 6.3% | 13D | Apr 3, 2025 | filing ↗ | |
| Chen Yu | 6.2% | 13G | Feb 27, 2026 | filing ↗ | |
| Aberdeen Group PLC | 6.1% | 13G | Jan 29, 2026 | filing ↗ | |
| Abrdn Inc | 6.1% | 13G | Jan 29, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Peter McNamara | $6K | Jun 30, 2026 | filing ↗ |
| Peter McNamara | $174K | Mar 6, 2026 | filing ↗ |
| Marcella Ruddy | $336K | Mar 6, 2026 | filing ↗ |
| Peter McNamara | $40K | Mar 4, 2026 | filing ↗ |
| Peter McNamara | $38K | Mar 3, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Shareholder vote (5.07) | Jun 8, 2026 | filing ↗ |
| Other events (8.01) | Jun 8, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 8, 2026 | filing ↗ |
| Earnings (2.02) | May 7, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 7, 2026 | filing ↗ |
| Officer/director changes (5.02) | Apr 23, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Apr 23, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Apr 23, 2026 | filing ↗ |
| Earnings (2.02) | Feb 26, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 26, 2026 | filing ↗ |
| Officer/director changes (5.02) | Feb 23, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 23, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 23, 2026 | filing ↗ |
| Earnings (2.02) | Nov 6, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 6, 2025 | filing ↗ |
| Other events (8.01) | Oct 29, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Oct 29, 2025 | filing ↗ |
| Earnings (2.02) | Aug 7, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Aug 7, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 7, 2025 | filing ↗ |