Third Rock Ventures V, L.P. - 31 Mar 2025 SCHEDULE 13G/A Report for Septerna, Inc. Common Stock, $0.001 par value per share (SEPN)

Filing Manager
Third Rock Ventures V, L.P.
Reporting Manager
Third Rock Ventures V, L.P.
Security
Septerna, Inc. Common Stock, $0.001 par value per share
Symbol
SEPN
Shares outstanding
44,397,079 shares
Disclosed Ownership
6,215,591 shares
Ownership
14%
Form type
SCHEDULE 13G/A
Filing time
09 May 2025, 16:15:03 UTC
Date of event
31 Mar 2025
Previous filing
13 Feb 2025
SEC
View on sec.gov

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Quoteable Key Fact

"Third Rock Ventures V, L.P. disclosed 14% ownership in Septerna, Inc. Common Stock, $0.001 par value per share (SEPN) on 31 Mar 2025."

Quick Takeaways

  • Third Rock Ventures V, L.P. filed SCHEDULE 13G/A for Septerna, Inc. Common Stock, $0.001 par value per share (SEPN).
  • Disclosed ownership: 14%.
  • Date of event: 31 Mar 2025.

What Changed

  • Previous schedule filing date: 13 Feb 2025.
  • Current filing was accepted on 09 May 2025, 16:15.

Why This Matters

  • This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
  • You can verify ownership claims directly against the original SEC filing.

Official SEC Source

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

See Original Filing

Reporting Managers (6)

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, Chief O.O 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, Chief Operating Officer of TRV GP V, LLC, general partner of Third Rock Ventures GP V, 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. 9.5% 4,211,659 0 4,211,659 /s/ Kevin Gillis Kevin Gillis, Chief O.O 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. 9.5% 4,211,659 0 4,211,659 /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 9.5% 4,211,659 0 4,211,659 /s/ Kevin Gillis Kevin Gillis, Chief Operating Officer of TRV GP VI, LLC

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