Stonepine Capital Management, LLC

Position in UPB — Upstream Bio, Inc.

CIK 1440771 BEND, OR

Position in UPB

as of Jun 30, 2026 · filed Aug 17, 2026 Compact

Position Value

$231,349

-$83,651 QoQ

Shares Held

33,432

-4.5% QoQ

Ownership

0.061%

of shares outstanding

% of Portfolio

0.18%

of 13F equity value

Holder Rank

#72

of 148 holders

Holding Since

Mar 2026

2 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Healthcare · as of Jun 30, 2026

Stonepine Capital Management, LLC holds $108,574,607 across 61 Biotechnology names. UPB ranks #50 (0.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	VSTM	Verastem, Inc.	3,349,627	$12,795,575
2	TENX	Tenax Therapeutics, Inc.	660,000	$9,603,000
3	NKTR	Nektar Therapeutics	120,654	$8,422,855
4	ADMA	Adma Biologics, Inc.	740,000	$6,193,800
5	CAMP	Camp4 Therapeutics Corp	1,389,622	$6,072,648
6	ELOX	Eloxx Pharmaceuticals, Inc.	397,160	$5,512,580
7	KZIA	Kazia Therapeutics Ltd	345,179	$4,860,120
8	CRBP	Corbus Pharmaceuticals Holdings, Inc.	425,000	$3,986,500

2 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$231,349	33,432	-4.5%	Shares	Sole	2026-08-17
2026-03-31	$315,000	35,000	—	Shares	Sole	2026-05-14
No filing history on record for this holder in this stock.