Form
SCHEDULE 13G
Passive or exempt beneficial ownership filing.
Third Rock Ventures V, L.P. - 31 Dec 2024 SCHEDULE 13G Report for Septerna, Inc. Common Stock, $0.001 par value per share (SEPN)
- Filing manager
- Third Rock Ventures V, L.P.
- Reporting owner
- Third Rock Ventures V, L.P.
- Beneficially owned shares
- 6,215,591 shares
- Large-stake signal
-
Ownership
14%Beneficial ownership of this reported class.
Shares
6,215,591 sharesShares beneficially owned as disclosed.
Event date
31 Dec 2024Date tied to the ownership event or amendment.
Accepted by SEC
13 Feb 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
- 14%
- Symbol
- SEPN
- Shares outstanding
- 44,397,079 shares
- SEC form
- SCHEDULE 13G
- Accepted by SEC
- 13 Feb 2025, 16:15:02 UTC
- Event date
- 31 Dec 2024
- Next SEC filing
- 09 May 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
Third Rock Ventures V, L.P. disclosed 14% ownership in Septerna, Inc. Common Stock, $0.001 par value per share (SEPN) on 31 Dec 2024.
Key facts
- Third Rock Ventures V, L.P. filed SCHEDULE 13G for Septerna, Inc. Common Stock, $0.001 par value per share (SEPN).
- Disclosed ownership: 14%.
- Date of event: 31 Dec 2024.
Change
- No earlier schedule filing is available for direct comparison.
- Current filing was accepted on 13 Feb 2025, 16:15.
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 (6)
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 |
|---|---|---|---|---|---|---|---|
| Third Rock Ventures V, L.P. | 14% | 6,215,591 | 0 | 6,215,591 | /s/ Kevin Gillis | Kevin Gillis,COO of TRV GP V, LLC, general partner of Third Rock Ventures GP V, L.P., general partner of Third Rock Ventures V, L.P. | |
| Third Rock Ventures GP V, L.P. | 14% | 6,215,591 | 0 | 6,215,591 | /s/ Kevin Gillis | Kevin Gillis, COO of TRV GP VI, LLC, general partner of Third Rock Ventures GP VI, L.P | |
| TRV GP V, LLC | 14% | 6,215,591 | 0 | 6,215,591 | /s/ Kevin Gillis | Kevin Gillis, Chief Operating Officer of TRV GP V, LLC | |
| Third Rock Ventures VI, L.P. | 7.1% | 3,152,456 | 0 | 3,152,456 | /s/ Kevin Gillis | Kevin Gillis, COO of TRV GP VI, LLC, general partner of Third Rock Ventures GP VI, L.P., general partner of Third Rock Ventures VI, L.P. | |
| Third Rock Ventures GP VI, L.P. | 7.1% | 3,152,456 | 0 | 3,152,456 | /s/ Kevin Gillis | Kevin Gillis, Chief Operating Officer of TRV GP VI, LLC, general partner of Third Rock Ventures GP VI, L.P. | |
| TRV GP VI, LLC | 7.1% | 3,152,456 | 0 | 3,152,456 | /s/ Kevin Gillis | Kevin Gillis, Chief Operating Officer of TRV GP VI, LLC |
CIK / CUSIP context first