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BlackRock, Inc.

Position in UPB — Upstream Bio, Inc.

CIK 2012383 New York, NY

Position in UPB

as of Jun 30, 2026 · filed Aug 7, 2026
Position Value
$25,973,232
-$4,362,969 QoQ
Shares Held
3,753,358
+11.4% QoQ
Ownership
6.85%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#4
of 148 holders
Holding Since
Dec 2024
7 quarters on record
Voting authority Sole 97% Shared 0% None 3%

Common Shares in UPB Over Time

Shares Held

Position Value (USD)

Position in Biotechnology

Healthcare · as of Jun 30, 2026

BlackRock, Inc. holds $85,603,777,939 across 474 Biotechnology names. UPB ranks #213 (0.0% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in UPB

Export CSV
7 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $25,973,232 3,753,358
2026-03-31 $30,336,201 3,370,689
2025-12-31 $90,803,279 3,344,504
2025-09-30 $48,975,706 2,603,706
2025-06-30 $23,019,633 2,096,506
2025-03-31 $7,256,897 1,185,768
2024-12-31 $18,376,630 1,117,800