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Equibles

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP

Position in UPB — Upstream Bio, Inc.

CIK 1164508 BOSTON, MA
Back to UPB Full portfolio

Position in UPB

as of Jun 30, 2026 · filed Aug 13, 2026
Position Value
$2,475,671
+$809,888 QoQ
Shares Held
357,756
+93.3% QoQ
Ownership
0.653%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#29
of 148 holders
Holding Since
Mar 2026
2 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

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP holds $2,515,799,583 across 71 Biotechnology names. UPB ranks #53 (0.1% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 VRTX
Vertex Pharmaceuticals Inc / Ma
 738,378 $366,774,503
2 INCY
Incyte Corp
 2,744,958 $311,168,438
3 REGN
Regeneron Pharmaceuticals, Inc.
 393,685 $245,478,344
4 EXEL
Exelixis, Inc.
 4,365,926 $237,550,033
5 GMAB
Genmab A/S
 4,975,324 $136,672,150
6 RPRX
Royalty Pharma plc
 2,435,341 $136,549,569
7 HALO
Halozyme Therapeutics, Inc.
 1,704,623 $133,420,842
8 ONC
BeOne Medicines Ltd.
 249,758 $71,173,537

All Filings in UPB

Export CSV
2 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $2,475,671 357,756
2026-03-31 $1,665,783 185,087