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MILLENNIUM MANAGEMENT LLC

Position in UPB — Upstream Bio, Inc.

CIK 1273087 NEW YORK, NY

Position in UPB

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$7,914,923
-$520,984 QoQ
Shares Held
1,143,775
+22.0% QoQ
Ownership
2.09%
of shares outstanding
% of Portfolio
0.01%
of 13F equity value
Holder Rank
#8
of 148 holders
Holding Since
Mar 2025
5 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in UPB Over Time

Shares Held

Position Value (USD)

Position in Biotechnology

Healthcare · as of Jun 30, 2026

MILLENNIUM MANAGEMENT LLC holds $4,631,421,099 across 322 Biotechnology names. UPB ranks #135 (0.2% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in UPB

Export CSV
5 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $7,914,923 1,143,775
2026-03-31 $8,435,907 937,323
2025-12-31 $14,043,717 517,264
2025-09-30 $754,525 40,113
2025-03-31 $378,191 61,796