Latest Period
Q4 2025
Security Snapshot
Tectonic Therapeutic, Inc. - Common Stock, $0.0001 par value per share (TECX) Institutional Ownership
CUSIP: 878972108
13F Institutional Holders and Ownership History from Q2 2024 to Q1 2026
Institutions Reporting
105
Shares (Excl. Options)
13,814,358
Price
$20.86
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- Type / Class
- Equity / Common Stock, $0.0001 par value per share
- Symbol
- TECX on Nasdaq
- Shares outstanding
- 18,867,097
- Price per share
- $30.06
- All holders as of 31 Dec 2025
- Q4 2025
- Total 13F shares
- 13,814,358
- Total reported value
- $288,147,446
- % of total 13F portfolios
- 0%
- Share change
- +1,619,551
- Value change
- +$44,832,425
- Number of holders
- 105
- Price from insider filings
- $30.06
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Quick Takeaways
- TECX - Tectonic Therapeutic, Inc. - Common Stock, $0.0001 par value per share is tracked under CUSIP 878972108.
- 105 institutions reported positions in Q4 2025.
- 5 significant owners is listed from Schedule 13D/13G reporting.
What Changed
- Holder count moved from 105 to 21 between Q4 2025 and Q1 2026.
- Reported value moved from $288,147,446 to $39,134,202.
Why This Matters
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Source Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 105 institutions filings for Q4 2025.
Investment Quick Answers
What is CUSIP 878972108?
CUSIP 878972108 identifies TECX - Tectonic Therapeutic, Inc. - Common Stock, $0.0001 par value per share in SEC 13F datasets.
Where can I see the latest institutional holders?
Review the Q4 2025 holders report and the ownership history table below.
Next ownership checks
Use the next link that matches the question you still need to answer about this security.
- Latest 13F filings when you want to inspect fresh institutional portfolio moves.
- Latest Schedule 13D/13G reports when you need large-owner changes outside the 13F cycle.
- All institutional ownership pages to compare this security with other holder-history pages.
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 878972108:
Significant Owners of Tectonic Therapeutic, Inc. - Common Stock, $0.0001 par value per share (TECX) based on Schedule 13D/G filings
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| SPRINGER TIMOTHY A | 32% | +7.9% | $96,537,428 | +$1,958,250 | 4,313,558 | +2.1% | Timothy A. Springer | 03 Apr 2025 |
| FMR LLC | 15% | +47% | $62,650,568 | +$28,714,995 | 2,799,400 | +85% | FMR LLC | 31 Mar 2025 |
| TCG Crossover GP II, LLC | 6.2% | $24,202,334 | 1,169,760 | Chen Yu | 12 Feb 2026 | |||
| Aberdeen Group plc | 6.1% | $23,818,449 | 1,141,824 | Aberdeen Group plc | 31 Dec 2025 | |||
| MCGUIRE TERRANCE | 6.3% | 0% | $14,725,503 | -$11,190,022 | 657,976 | -43% | Terrance McGuire | 03 Apr 2025 |
As of 31 Dec 2025, 105 institutional investors reported holding 13,814,358 shares of Tectonic Therapeutic, Inc. - Common Stock, $0.0001 par value per share (TECX). This represents 73% of the company’s total 18,867,097 outstanding shares.
Top 25 Institutional Shareholders
The largest institutional shareholders of Tectonic Therapeutic, Inc. - Common Stock, $0.0001 par value per share (TECX) together control 66% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| FMR LLC | 15% | 2,807,442 | +0.02% | 0% | $58,563,233 |
| Aberdeen Group plc | 6.1% | 1,141,824 | +221% | 0.04% | $23,818,449 |
| BRAIDWELL LP | 4.9% | 927,524 | +26% | 0.62% | $19,348,151 |
| BAKER BROS. ADVISORS LP | 4.8% | 903,400 | +803% | 0.11% | $18,844,924 |
| BlackRock, Inc. | 4.5% | 854,363 | +3.2% | 0% | $17,822,013 |
| 5AM Venture Management, LLC | 3.2% | 606,660 | +19% | 4% | $12,654,928 |
| VANGUARD GROUP INC | 3.2% | 599,898 | +5.3% | 0% | $12,513,872 |
| ORBIMED ADVISORS LLC | 3% | 574,600 | 0.26% | $11,986,156 | |
| Point72 Asset Management, L.P. | 2.6% | 492,332 | +17% | 0.02% | $10,270,046 |
| Vestal Point Capital, LP | 1.7% | 328,000 | 0.25% | $6,842,080 | |
| CITADEL ADVISORS LLC | 1.7% | 317,617 | +6.4% | 0% | $6,625,491 |
| Bollard Group LLC | 1.6% | 302,953 | 0% | 0.17% | $6,320,000 |
| MILLENNIUM MANAGEMENT LLC | 1.6% | 300,820 | +26% | 0% | $6,275,105 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.4% | 263,560 | -2.2% | 0% | $5,498,708 |
| Pale Fire Capital SE | 1.4% | 261,026 | +0.5% | 0.7% | $5,445,002 |
| Prosight Management, LP | 1.2% | 235,000 | -38% | 1% | $4,902,100 |
| Opaleye Management Inc. | 1.1% | 214,747 | 0.6% | $4,479,622 | |
| KENNEDY CAPITAL MANAGEMENT LLC | 1.1% | 209,225 | +0.22% | 0.09% | $4,364,434 |
| STATE STREET CORP | 1.1% | 209,125 | +26% | 0% | $4,362,348 |
| Woodline Partners LP | 1.1% | 200,000 | 0% | 0.02% | $4,172,000 |
| Squarepoint Ops LLC | 1.1% | 199,646 | +205% | 0.01% | $4,164,616 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 0.8% | 151,713 | 0% | $3,164,733 | |
| WELLS FARGO & COMPANY/MN | 0.64% | 120,411 | +18% | 0% | $2,511,774 |
| D. E. Shaw & Co., Inc. | 0.64% | 120,250 | 0% | $2,508,415 | |
| ExodusPoint Capital Management, LP | 0.59% | 111,188 | +754% | 0.03% | $2,319,382 |
Institutional Holders of Tectonic Therapeutic, Inc. - Common Stock, $0.0001 par value per share (TECX) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 1,266,070 | $39,134,202 | +$153,113 | $30.91 | 21 |
| 2025 Q4 | 13,814,358 | $288,147,446 | +$44,832,425 | $20.86 | 105 |
| 2025 Q3 | 12,105,071 | $189,928,399 | -$10,912,119 | $15.69 | 99 |
| 2025 Q2 | 12,112,699 | $240,681,548 | +$18,199,970 | $19.87 | 82 |
| 2025 Q1 | 11,227,627 | $198,820,413 | +$3,981,198 | $17.71 | 78 |
| 2024 Q4 | 7,686,866 | $354,905,739 | +$30,548,457 | $46.17 | 70 |
| 2024 Q3 | 7,175,807 | $217,428,427 | +$53,307,772 | $30.30 | 52 |
| 2024 Q2 | 5,345,881 | $88,045,301 | +$88,041,200 | $16.47 | 39 |