Tectonic Therapeutic
TECX · NASDAQ
$21.83+$0.675 (+3.19%)TodayMarket closed ·
Prev close $21.15
Who owns TECX
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 77.6% of TECX’s shares.
- Springer Timothy A24.0%
- Fidelity Management & Research Company LLC15.0%
- TAS Partners, L.L.C.8.0%
- TCG Crossover Management, LLC6.4%
- Next 6 largest institutions24.3%
- All other shareholders22.4%
| Holder | Shares | % of shares |
|---|---|---|
| Springer Timothy A | 4.52M | 23.96% |
| Fidelity Management & Research Company LLC | 2.83M | 15.00% |
| TAS Partners, L.L.C. | 1.50M | 7.97% |
| TCG Crossover Management, LLC | 1.20M | 6.39% |
| abrdn Inc. | 1.14M | 6.05% |
| First Light Asset Management, LLC | 800.73K | 4.24% |
| BlackRock Institutional Trust Company, N.A. | 774.54K | 4.10% |
| Polaris Partners | 657.98K | 3.49% |
| Baker Bros. Advisors LP | 607.79K | 3.22% |
| 5AM Ventures | 606.66K | 3.21% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| abrdn Healthcare Investors Fund (US) | 770.94K | 4.09% |
| Fidelity Growth Company Fund | 719.35K | 3.81% |
| Fidelity Select Biotechnology Portfolio | 405.39K | 2.15% |
| abrdn Life Sciences Investors | 370.88K | 1.97% |
| Vanguard Total Stock Market Index Fund | 364.41K | 1.93% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $53.39K (5 trades) of TECX on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| McNamara Peter | Sale | 536 | $12.35K |
| Ruddy Marcella K. | Tax withholding | 525 | $12.43K |
| McNamara Peter | Tax withholding | 444 | $10.51K |
| Schwabish Marc | Tax withholding | 411 | $9.73K |
| Lochner Daniel | Tax withholding | 520 | $12.31K |
| REICIN ALISE | Tax withholding | 1.54K | $36.57K |
| Ruddy Marcella K. | Award | 24.25K | — |
| McNamara Peter | Award | 21.00K | — |
| Schwabish Marc | Award | 17.75K | — |
| Lochner Daniel | Award | 24.25K | — |
Short interest
Settled Sep 30, 2026
- Shares short
- 2.22M
- Days to cover
- 8.07
- % of shares outstanding
- 11.78%
- Average daily volume
- 275.51K
- Change since last report
- +0.2%
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