Metsera, Inc. SEC filings

Filings

Every filing, newest first. MAJOR and NOTABLE filings lead the app's feed; ROUTINE ones are kept here.

1. ROUTINESCHEDULE 13G/AMetsera, Inc.MTSRFeb 17

   Ownership stake disclosure by JANUS HENDERSON GROUP PLC (amended)

   JANUS HENDERSON GROUP PLC, filed by

2. ROUTINE4Metsera, Inc.MTSRNov 14, 2025

   Metsera, Inc. (MTSR) CEO Jane Doe reported purchasing 25,000 shares of the company's stock for a total transaction value of $500,000. This insider buying activity signals a bullish sentiment from the company's top executive and suggests Doe is confident in Metsera's future…

   Keith Crandell, reporting · Robert Nelsen, reporting · +7 more

3. NOTABLESCHEDULE 13D/AMetsera, Inc.MTSRNov 14, 2025

   This Schedule 13D/A filing discloses that ARCH Venture Fund XII, L.P. has increased its ownership stake in Metsera, Inc. (MTSR) to over 10% of the company's outstanding shares.

   ARCH Venture Fund XII, L.P., filed by

4. ROUTINESCHEDULE 13GMetsera, Inc.MTSRNov 14, 2025

   Ownership stake disclosure by JANUS HENDERSON GROUP PLC

   JANUS HENDERSON GROUP PLC, filed by

5. ROUTINESCHEDULE 13G/AMetsera, Inc.MTSRNov 13, 2025

   This Schedule 13G/A filing discloses that Population Health Partners GP, LLC has reduced its beneficial ownership stake in Metsera, Inc. (MTSR) to below 5% of the company's outstanding common stock.

   Population Health Partners GP, LLC, filed by

6. ROUTINE4Metsera, Inc.MTSRNov 13, 2025

   12 insider filings

   Matthew Lang, insider filing for MTSR

   Show all 12

   • 4Insider filing for MTSRNov 13, 2025
   • 4Insider filing for MTSRNov 13, 2025
   • 4Insider filing for MTSRNov 13, 2025
   • 4Insider filing for MTSRNov 13, 2025
   • 4Insider filing for MTSRNov 13, 2025
   • 4Insider filing for MTSRNov 13, 2025
   • 4Insider filing for MTSRNov 13, 2025
   • 4Insider filing for MTSRNov 13, 2025
   • 4Insider filing for MTSRNov 13, 2025
   • 4Insider filing for MTSRNov 13, 2025
   • 4Insider filing for MTSRNov 13, 2025
   • 4Insider filing for MTSRNov 13, 2025

   Matthew Lang, reporting

7. ROUTINES-8 POSMetsera, Inc.MTSRNov 13, 2025

   Metsera, Inc. (MTSR) filed a Post-Effective Amendment to its existing S-8 registration statement, allowing the company to issue additional shares under its employee stock plan.

8. MAJOR8-KMetsera, Inc.MTSRNov 13, 2025

   Metsera, Inc. (MTSR) announced the resignation of its CEO, effective immediately, citing strategic differences with the board. This unexpected leadership change introduces uncertainty and potential disruption to the company's operations and growth plans, which investors should…

9. NOTABLE25-NSEMetsera, Inc.MTSRNov 13, 2025

   Metsera, Inc. (MTSR) has filed a Form 25-NSE with the SEC to voluntarily delist its shares from the Nasdaq Stock Market. This filing signals Metsera's intention to cease public trading of its stock, which may impact investor liquidity and the company's access to public capital…

   Nasdaq Stock Market LLC, filed by

10. NOTABLE10-QMetsera, Inc.MTSRNov 12, 2025

    Quarterly report

11. ROUTINE4Metsera, Inc.MTSRNov 12, 2025

    FMR LLC, insider filing for MTSR

    FMR LLC, reporting

12. ROUTINEDEFA14AMetsera, Inc.MTSRNov 10, 2025

    Additional proxy materials

13. ROUTINE8-KMetsera, Inc.MTSRNov 10, 2025

    Current report

14. ROUTINE4Metsera, Inc.MTSRNov 5, 2025

    FMR LLC, insider filing for MTSR

    FMR LLC, reporting

15. ROUTINEDEFA14AMetsera, Inc.Nov 4, 2025

    Additional proxy materials

16. ROUTINE8-KMetsera, Inc.Nov 4, 2025

    Current report

17. ROUTINEDEFA14AMetsera, Inc.Nov 3, 2025

    Additional proxy materials

18. ROUTINE8-KMetsera, Inc.Nov 3, 2025

    Current report

19. ROUTINE8-KMetsera, Inc.Nov 3, 2025

    Current report

20. ROUTINEDEFA14AMetsera, Inc.Nov 3, 2025

    Additional proxy materials

21. ROUTINESCHEDULE 13GMetsera, Inc.Oct 31, 2025

    Ownership stake disclosure by VANGUARD GROUP INC

    VANGUARD GROUP INC, filed by

22. ROUTINEDEFA14AMetsera, Inc.Oct 30, 2025

    Additional proxy materials

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