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Stonepine Capital Management, LLC

Position in UPB — Upstream Bio, Inc.

CIK 1440771 BEND, OR

Position in UPB

as of Mar 31, 2026 · filed May 14, 2026
Position Value
$315,000
New position
Shares Held
35,000
first reported quarter
Ownership
0.064%
of shares outstanding
% of Portfolio
0.28%
of 13F equity value
Holder Rank
not a current holder
Holding Since
Mar 2026
1 quarter on record
Voting authority Sole 100% Shared 0% None 0%

Position in Biotechnology

Healthcare · as of Mar 31, 2026

Stonepine Capital Management, LLC holds $96,227,473 across 56 Biotechnology names. UPB ranks #36 (0.3% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in UPB

Export CSV
1 filing row on record
Report Date Value (USD) Shares
2026-03-31 $315,000 35,000