Form 3 - Initial statement of beneficial ownership of securities:
SEC Accession No. 0000950170-25-011345
Filing Date
2025-01-30
Accepted
2025-01-30 21:25:33
Documents
2
Period of Report
2025-01-30

Document Format Files

Seq Description Document Type Size
1 3 ownership.html 3  
1 3 ownership.xml 3 19865
2 EX-24.1 ck0002040807-ex24_1.htm EX-24.1 40799
  Complete submission text file 0000950170-25-011345.txt   66435
Mailing Address 8755 W. HIGGINS ROAD SUITE 1025 CHICAGO IL 60631
Business Address
CRANDELL KEITH (Reporting) CIK: 0001219039 (see all company filings)

Type: 3 | Act: 34 | File No.: 001-42489 | Film No.: 25575524

Mailing Address 8755 W. HIGGINS ROAD SUITE 1025 CHICAGO IL 60631
Business Address
NELSEN ROBERT (Reporting) CIK: 0001219042 (see all company filings)

Type: 3 | Act: 34 | File No.: 001-42489 | Film No.: 25575522

Mailing Address 8755 W. HIGGINS ROAD SUITE 1025 CHICAGO IL 60631
Business Address
GILLIS STEVEN (Reporting) CIK: 0001229592 (see all company filings)

Type: 3 | Act: 34 | File No.: 001-42489 | Film No.: 25575523

Mailing Address 8755 W. HIGGINS ROAD, SUITE 1025 CHICAGO IL 60631
Business Address 8755 W. HIGGINS ROAD, SUITE 1025 CHICAGO IL 60631 773-380-6600
ARCH Venture Fund XII, L.P. (Reporting) CIK: 0001906837 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 001-42489 | Film No.: 25575529

Mailing Address 8755 W HIGGINS ROAD SUITE 1025 CHICAGO IL 60631
Business Address 8755 W HIGGINS ROAD SUITE 1025 CHICAGO IL 60631 7733806600
ARCH Venture Partners XII, LLC (Reporting) CIK: 0001979548 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 001-42489 | Film No.: 25575530

Mailing Address 8755 W HIGGINS ROAD SUITE 1025 CHICAGO IL 60631
Business Address 8755 W HIGGINS ROAD SUITE 1025 CHICAGO IL 60631 7733806600
ARCH Venture Partners XII, L.P. (Reporting) CIK: 0001979765 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 001-42489 | Film No.: 25575528

Mailing Address 8755 W. HIGGINS ROAD, SUITE 1025 CHICAGO IL 60631
Business Address 8755 W. HIGGINS ROAD, SUITE 1025 CHICAGO IL 60631 773-380-6600
ARCH Venture Fund XIII, L.P. (Reporting) CIK: 0002006772 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 001-42489 | Film No.: 25575527

Mailing Address 8755 W HIGGINS ROAD SUITE 1025 CHICAGO IL 60631
Business Address 8755 W HIGGINS ROAD SUITE 1025 CHICAGO IL 60631 773-380-6600
ARCH Venture Partners XIII, LLC (Reporting) CIK: 0002016082 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 001-42489 | Film No.: 25575525

Mailing Address 8755 W HIGGINS ROAD SUITE 1025 CHICAGO IL 60631
Business Address 8755 W HIGGINS ROAD SUITE 1025 CHICAGO IL 60631 773-380-6600
ARCH Venture Partners XIII, L.P. (Reporting) CIK: 0002016083 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 001-42489 | Film No.: 25575526

Mailing Address 3 WORLD TRADE CENTER 175 GREENWICH STREET NEW YORK NY 10007
Business Address 3 WORLD TRADE CENTER 175 GREENWICH STREET NEW YORK NY 10007 (212) 784-6595
Metsera, Inc. (Issuer) CIK: 0002040807 (see all company filings)

EIN.: 000000000 | State of Incorp.: DE | Fiscal Year End: 1231
SIC: 2834 Pharmaceutical Preparations
(CF Office: 03 Life Sciences)