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XTX Topco Ltd

Position in UPB — Upstream Bio, Inc.

CIK 1828301 LONDON, X0

Position in UPB

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$1,677,034
-$206,459 QoQ
Shares Held
242,346
+15.8% QoQ
Ownership
0.442%
of shares outstanding
% of Portfolio
0.02%
of 13F equity value
Holder Rank
#39
of 148 holders
Holding Since
Mar 2025
4 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

XTX Topco Ltd holds $414,894,447 across 381 Biotechnology names. UPB ranks #77 (0.4% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in UPB

Export CSV
4 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $1,677,034 242,346
2026-03-31 $1,883,493 209,277
2025-12-31 $409,720 15,091
2025-03-31 $77,913 12,731