Form
SCHEDULE 13D/A
Active or control-oriented beneficial ownership filing.
Terrance McGuire - 03 Apr 2025 SCHEDULE 13D/A Report for Tectonic Therapeutic, Inc. Common Stock, $0.0001 par value per share (TECX)
- Filing manager
- Terrance McGuire
- Reporting owner
- Terrance McGuire
- Beneficially owned shares
- 657,976 shares
- Large-stake signal
-
Ownership
6.3%Beneficial ownership of this reported class.
Shares
657,976 sharesShares beneficially owned as disclosed.
Event date
03 Apr 2025Date tied to the ownership event or amendment.
Accepted by SEC
07 Apr 2025EDGAR acceptance date.
How to read this large-stake filing
- Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
- Compare this filing with the holder history and issuer page before treating the percentage as a current position.
- Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
- Class ownership
- 6.3%
- Symbol
- TECX
- Shares outstanding
- 10,444,063 shares
- SEC form
- SCHEDULE 13D/A
- Accepted by SEC
- 07 Apr 2025, 17:19:24 UTC
- Event date
- 03 Apr 2025
- Prior SEC filing
- 07 Feb 2025
- Source filing
- View source filing
Ownership signal
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Subject security
Names, identifiers, and filing context for this profile.
2 source fields
Source evidence
Original filing metadata and source links for verification.
5 source fields
Key filing fact
Terrance McGuire disclosed 6.3% ownership in Tectonic Therapeutic, Inc. Common Stock, $0.0001 par value per share (TECX) on 03 Apr 2025.
Key facts
- Terrance McGuire filed SCHEDULE 13D/A for Tectonic Therapeutic, Inc. Common Stock, $0.0001 par value per share (TECX).
- Disclosed ownership: 6.3%.
- Date of event: 03 Apr 2025.
Change
- Previous schedule filing date: 07 Feb 2025.
- Current filing was accepted on 07 Apr 2025, 17:19.
Research use
- This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
- Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.
Evidence
Backed by Schedule 13D/13G
View source filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Disclosed reporting parties (8)
Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.
| Name | Ownership | Shares owned | Sole voting power | Shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Terrance McGuire | 6.3% | 657,976 | 0 | 657,976 | /s/ Lauren Crockett* | Lauren Crockett/Attorney-in-Fact | 0001117003 |
| Polaris Partners IX, L.P. | 3.1% | 573,062 | 0 | 573,062 | /s/ Lauren Crockett | Lauren Crockett/General Counsel of Polaris Partners GP IX, L.L.C. the General Partner of Polaris Partners IX, L.P. | 0001779755 |
| Polaris Partners GP IX, L.L.C. | 3.1% | 573,062 | 0 | 573,062 | /s/ Lauren Crockett | Lauren Crockett/General Counsel | 0001877150 |
| Polaris Founders Capital Fund I, L.P. | 0.1% | 20,262 | 0 | 20,262 | /s/ Gregg Rubin | Gregg Rubin/General Partner of Polaris Founders Capital Management Co. I, L.L.C. the General Partner of Polaris Founders Capital Fund I, L.P. | |
| Polaris Founders Capital Fund Management Co. I, L.L.C. | 0.1% | 20,262 | 0 | 20,262 | /s/ Gregg Rubin | Gregg Rubin/General Partner | |
| Polaris Founders Capital Fund II, L.P. | 0.3% | 64,652 | 0 | 64,652 | /s/ Harold Friedman | Harold Friedman/Vice President of Polaris Founders Capital Management Co. II, L.L.C. the General Partner of Polaris Founders Capital Fund II, L.P. | |
| Polaris Founders Capital Fund Management Co. II, L.L.C. | 0.3% | 64,652 | 0 | 64,652 | /s/ Harold Friedman | Harold Friedman/Vice President | |
| Jonathan Flint | 0.5% | 84,914 | 0 | 84,914 | /s/ Lauren Crockett* | Lauren Crockett/Attorney-in-Fact | 0001295676 |
CIK / CUSIP context first