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MARTINGALE ASSET MANAGEMENT L P

Position in UPB — Upstream Bio, Inc.

CIK 936944 BOSTON, MA

Position in UPB

as of Mar 31, 2026 · filed May 13, 2026
Position Value
$236,007
New position
Shares Held
26,223
first reported quarter
Ownership
0.048%
of shares outstanding
% of Portfolio
0.01%
of 13F equity value
Holder Rank
not a current holder
Holding Since
Mar 2026
1 quarter on record
Voting authority Sole 13% Shared 0% None 87%

Position in Biotechnology

Healthcare · as of Mar 31, 2026

MARTINGALE ASSET MANAGEMENT L P holds $113,855,318 across 56 Biotechnology names. UPB ranks #45 (0.2% 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 $236,007 26,223