Form 4 - Statement of changes in beneficial ownership of securities:
SEC Accession No. 0000950170-25-016467
Filing Date
2025-02-07
Accepted
2025-02-07 17:29:56
Documents
2
Period of Report
2025-02-06

Document Format Files

Seq Description Document Type Size
1 4 ownership.html 4  
1 4 ownership.xml 4 3909
2 EX-24.2 ck0002022626-ex24_2.htm EX-24.2 8334
  Complete submission text file 0000950170-25-016467.txt   13666
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)

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

Mailing Address UPSTREAM BIO, INC. 460 TOTTEN POND ROAD, SUITE 420 WALTHAM MA 02451
Business Address
Houghton Adam (Reporting) CIK: 0002031691 (see all company filings)

Type: 4 | Act: 34 | File No.: 001-42366 | Film No.: 25602987