ARCH Venture Fund XII, L.P. - 13 Nov 2025 SCHEDULE 13D/A Report for Metsera, Inc. Common Stock, $0.00001 par value (MTSR)

Filing Manager
ARCH Venture Fund XII, L.P.
Reporting Manager
ARCH Venture Fund XII, L.P.
Security
Metsera, Inc. Common Stock, $0.00001 par value
Symbol
MTSR
Disclosed Ownership
0 shares
Ownership
0%
Form type
SCHEDULE 13D/A
Filing time
14 Nov 2025, 18:22:29 UTC
Date of event
13 Nov 2025
Previous filing
10 Feb 2025
SEC
View on sec.gov

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Quoteable Key Fact

"ARCH Venture Fund XII, L.P. disclosed 0% ownership in Metsera, Inc. Common Stock, $0.00001 par value (MTSR) on 13 Nov 2025."

Quick Takeaways

  • ARCH Venture Fund XII, L.P. filed SCHEDULE 13D/A for Metsera, Inc. Common Stock, $0.00001 par value (MTSR).
  • Disclosed ownership: 0%.
  • Date of event: 13 Nov 2025.

What Changed

  • Previous schedule filing date: 10 Feb 2025.
  • Current filing was accepted on 14 Nov 2025, 18:22.

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.

Source Evidence

Backed by Schedule 13D/13G

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

See Original Filing

Reporting Managers (11)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
ARCH Venture Fund XII, L.P. 0% 0 0 0 ARCH Venture Partners XII, L.P. its General Partner 0001906837
ARCH Venture Fund XIII, L.P. 0% 0 0 0 ARCH Venture Partners XIII, LLC its General Partner 0002006772
ARCH Venture Partners XII, L.P. 0% 0 0 0 ARCH Venture Partners XII, LLC its General Partner 0001979765
ARCH Venture Partners XIII, L.P. 0% 0 0 0 ARCH Venture Partners XIII, LLC its General Partner 0002016083
ARCH Venture Partners XII, LLC 0% 0 0 0 /s/ Mark McDonnell Mark McDonnell as Attorney-in-Fact for Robert Nelsen, Managing Director 0001979548
ARCH Venture Partners XIII, LLC 0% 0 0 0 /s/ Mark McDonnell Mark McDonnell as Attorny-in-Fact for Keith Crandell, Managing Director 0002016082
Robert Nelsen 0% 0 0 0 /s/ Mark McDonnell Mark McDonnell as Attorny-in-Fact for Robert Nelsen 0001219042
Keith Crandell 0% 0 0 0 /s/ Mark McDonnell Mark McDonnell as Attorny-in-Fact for Keith Crandell 0001219039
Kristina Burow 0% 0 0 0 /s/ Mark McDonnell Mark McDonnell as Attorny-in-Fact for Kristina Burow 0001569248
Steven Gillis 0% 0 0 0 /s/ Mark McDonnell Mark McDonnell as Attorny-in-Fact for Steven Gillis 0001229592
Paul Berns 0% 0 0 0 /s/ Mark McDonnell Mark McDonnell as Attorny-in-Fact for Paul Berns 0001202769

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