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Form 4 - Statement of changes in beneficial ownership of securities:
SEC Accession No. 0000950170-24-137213
Filing Date
2024-12-17
Accepted
2024-12-17 16:18:03
Documents
1
Period of Report
2024-12-16

Document Format Files

Seq Description Document Type Size
1 4 ownership.html 4  
1 4 ownership.xml 4 3868
  Complete submission text file 0000950170-24-137213.txt   5291
Mailing Address 890 WINTER STREET, SUITE 200 WALTHAM MA 02451
Business Address 890 WINTER STREET, SUITE 200 WALTHAM MA 02451 781-208-2466
Upstream Bio, Inc. (Issuer) CIK: 0002022626 (see all company filings)

IRS No.: 000000000 | State of Incorp.: DE | Fiscal Year End: 1231
SIC: 2834 Pharmaceutical Preparations
(CF Office: 03 Life Sciences)

Mailing Address UPSTREAM BIO, INC. 890 WINTER STREET, SUITE 200 WALTHAM MA 02451
Business Address
Ambrose Allison (Reporting) CIK: 0002047381 (see all company filings)

Type: 4 | Act: 34 | File No.: 001-42366 | Film No.: 241555891