Security key
878972108
Tectonic Therapeutic, Inc. - Common Stock, $0.0001 par value per share (TECX)
CUSIP: 878972108
Q1 2025 13F Holders as of 31 Mar 2025
- Security type / class
- Equity / Common Stock, $0.0001 par value per share
- Total 13F shares
- 11,227,627
- Total 13F value
- $198,820,413
- Share change
- +3,538,334
- SEC-reported price per share
- $17.71
- Number of holders
- 78
- Value change
- +$3,981,198
- Number of buys
- 58
- Number of sells
- 34
- Shares outstanding
- 18,867,097
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2025
Institutions
78
Top holders
10
TECX full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q3 2026
Tectonic Therapeutic, Inc. SEC filings
Tectonic Therapeutic, Inc. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 878972108
Recent filing periods:
Ownership snapshot
Top reported holders of TECX - Tectonic Therapeutic, Inc. - Common Stock, $0.0001 par value per share (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
FMR LLC
Disclosed value leader
FMR LLC
Comparable rows
1/15
Latest evidence
31 Dec 2024
13F
13D/G
3/4/5
Lead comparable stake: 15%
14 rows are not safely comparable across share classes.
13D/G row: FMR LLC
Showing 1-6 of 15 holder rows.
Quick read
FMR LLC leads the comparable SEC ownership view at 15%.
1 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens FMR LLC's linked filing trail.
Comparable ownership
Top 1
FMR LLC
15%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| FMR LLC |
13F
13D/G
Company
|
15%
Reported 13D/G
· 31 Mar 2025
|
$70,009,186
1,516,335 shares
|
— | 31 Dec 2024 |
| Braden M. Leonard |
3/4/5
Former 10% owner of AVROBIO
|
—
denominator unverified
|
$563,795
433,688 shares
|
— | 20 Jun 2024 |
| Vida Ventures Advisors, LLC |
13F
Company
|
—
denominator unverified
|
$47,493,879
1,028,674 shares
|
— | 31 Dec 2024 |
| EcoR1 Capital, LLC |
13F
Company
|
—
denominator unverified
|
$39,204,932
849,143 shares
|
— | 31 Dec 2024 |
| FARALLON CAPITAL MANAGEMENT, L.L.C. |
13F
Company
|
—
denominator unverified
|
$32,921,519
713,050 shares
|
— | 31 Dec 2024 |
| 5AM Venture Management, LLC |
13F
Company
|
—
denominator unverified
|
$27,547,792
596,660 shares
|
— | 31 Dec 2024 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q1 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
78
Shares
11,227,627
Rows available
78
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2025 vs Q1 2025 Across Filers
Q1 2025 holders
78
Q1 2025 holders
78
Holder diff
0
| Investor | Q1 2025 Shares | Q1 2025 Shares | Share Diff | Share Chg % | Q1 2025 value | Q1 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend