Latest Period
Q1 2026
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
111
Shares (Excl. Options)
13,811,456
Price
$30.91
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- Security type / class
- Equity / Common Stock, $0.0001 par value per share
- Symbol
- TECX on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 13,811,456
- Total 13F value
- $426,833,189
- Portfolio coverage rank
- 0%
- Share change
- +78,131
- Value change
- +$10,638,500
- Number of holders
- 111
- Shares outstanding
- 18,867,097
- SEC-reported price per share
- $29.12
- Insider filing price
- $29.12
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- TECX - Tectonic Therapeutic, Inc. - Common Stock, $0.0001 par value per share is tracked under CUSIP 878972108.
- 111 institutions reported positions in Q1 2026.
- 5 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 105 to 111 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $288,147,446 to $426,833,189.
Research use
- 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.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 111 institutions filings for Q1 2026.
Security key
878972108
Latest holder period
Q1 2026
13F holders
111
13D/G owners
5
CIK / CUSIP context first
Open Q1 2026 holders
TECX full holder history
Tectonic Therapeutic, Inc. SEC filings
Tectonic Therapeutic, Inc. company facts
Tectonic Therapeutic, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 878972108:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
5
Security
TECX
| 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 Mar 2026, 111 institutional investors reported holding 13,811,456 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.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
65%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| FMR LLC | 15% | 2,816,494 | +0.32% | 0% | $87,057,820 |
| TCG Crossover Management, LLC | 6.4% | 1,204,891 | 1.1% | $37,243,181 | |
| Aberdeen Group plc | 6.1% | 1,141,824 | 0% | 0.06% | $35,293,780 |
| BlackRock, Inc. | 4.6% | 860,352 | +0.7% | 0% | $26,593,482 |
| BRAIDWELL LP | 4.5% | 847,151 | -8.7% | 0.87% | $26,185,437 |
| First Light Asset Management, LLC | 3.4% | 647,743 | 1.8% | $20,021,736 | |
| BAKER BROS. ADVISORS LP | 3.2% | 607,788 | -33% | 0.11% | $18,786,727 |
| 5AM Venture Management, LLC | 3.2% | 606,660 | 0% | 5.2% | $18,751,861 |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.5% | 473,532 | 0% | 0% | $14,636,874 |
| Vestal Point Capital, LP | 1.7% | 328,000 | 0% | 0.28% | $10,138,480 |
| Bollard Group LLC | 1.6% | 302,953 | 0% | 0.29% | $9,364,000 |
| KENNEDY CAPITAL MANAGEMENT LLC | 1.5% | 286,682 | +37% | 0.19% | $8,861,341 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.4% | 268,273 | +1.8% | 0% | $8,294,010 |
| MARSHALL WACE, LLP | 1.2% | 229,595 | +643% | 0.01% | $7,096,781 |
| ORBIMED ADVISORS LLC | 1.2% | 226,600 | -61% | 0.16% | $7,004,206 |
| STATE STREET CORP | 1.1% | 213,505 | +2.1% | 0% | $6,599,440 |
| Squarepoint Ops LLC | 0.87% | 164,419 | -18% | 0.01% | $5,082,191 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 0.87% | 164,055 | 0% | $5,072,000 | |
| Ikarian Capital, LLC | 0.83% | 157,537 | 0.7% | $4,869,469 | |
| AMERIPRISE FINANCIAL INC | 0.76% | 143,432 | 0% | $4,433,482 | |
| Opaleye Management Inc. | 0.65% | 123,000 | -43% | 0.53% | $3,801,930 |
| Soleus Capital Management, L.P. | 0.64% | 121,684 | 0.15% | $3,761,252 | |
| D. E. Shaw & Co., Inc. | 0.62% | 116,120 | -3.4% | 0% | $3,589,269 |
| WELLS FARGO & COMPANY/MN | 0.6% | 112,664 | -6.4% | 0% | $3,482,444 |
| Woodline Partners LP | 0.53% | 100,000 | -50% | 0.01% | $3,091,000 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
8
Latest
Q1 2026
Rows shown
1-8 of 8
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 13,811,456 | $426,833,189 | +$10,638,500 | $30.91 | 111 |
| 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 |