SEC Seal
SEC Banner
Search the Next-Generation EDGAR System
Filing Detail
Form S-1MEF - Registration adding securities to prior Form S-1 registration [Rule 462(b)]:
SEC Accession No. 0001193125-24-236086
Filing Date
2024-10-10
Accepted
2024-10-10 18:59:02
Documents
4
Effectiveness Date
2024-10-10

Document Format Files

Seq Description Document Type Size
1 S-1MEF d847845ds1mef.htm S-1MEF 29889
2 EX-5.1 d847845dex51.htm EX-5.1 5598
3 EX-23.1 d847845dex231.htm EX-23.1 2098
4 EX-FILING FEES d847845dexfilingfees.htm EX-FILING FEES 25471
  Complete submission text file 0001193125-24-236086.txt   64114
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. (Filer) CIK: 0002022626 (see all company filings)

IRS No.: 000000000 | State of Incorp.: DE | Fiscal Year End: 1231
Type: S-1MEF | Act: 33 | File No.: 333-282592 | Film No.: 241366074
SIC: 2834 Pharmaceutical Preparations
(CF Office: 03 Life Sciences)