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VANGUARD PORTFOLIO MANAGEMENT LLC

Position in UPB — Upstream Bio, Inc.

CIK 2100121 MALVERN, PA

Position in UPB

as of Jun 30, 2026 · filed Aug 13, 2026
Position Value
$4,931,655
-$1,617,744 QoQ
Shares Held
712,667
-2.1% QoQ
Ownership
1.30%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#17
of 148 holders
Holding Since
Mar 2026
2 quarters on record
Voting authority Sole 0% Shared 0% None 100%

Common Shares in UPB Over Time

Shares Held

Position Value (USD)

Position in Biotechnology

Healthcare · as of Jun 30, 2026

VANGUARD PORTFOLIO MANAGEMENT LLC holds $29,186,942,856 across 295 Biotechnology names. UPB ranks #183 (0.0% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in UPB

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2 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $4,931,655 712,667
2026-03-31 $6,549,399 727,711