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RHUMBLINE ADVISERS

Position in UPB — Upstream Bio, Inc.

CIK 1115418 BOSTON, MA

Position in UPB

as of Jun 30, 2026 · filed Aug 12, 2026
Position Value
$293,297
-$77,530 QoQ
Shares Held
42,384
+2.9% QoQ
Ownership
0.077%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#67
of 148 holders
Holding Since
Dec 2024
7 quarters on record
Voting authority Sole 16% Shared 0% None 84%

Common Shares in UPB Over Time

Shares Held

Position Value (USD)

Position in Biotechnology

Healthcare · as of Jun 30, 2026

RHUMBLINE ADVISERS holds $1,414,750,230 across 329 Biotechnology names. UPB ranks #220 (0.0% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in UPB

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7 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $293,297 42,384
2026-03-31 $370,827 41,203
2025-12-31 $1,127,349 41,523
2025-09-30 $929,326 49,406
2025-06-30 $527,764 48,066
2025-03-31 $81,561 13,327
2024-12-31 $274,893 16,721