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

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