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Shay Capital LLC

Position in UPB — Upstream Bio, Inc.

CIK 1723643 NEW YORK, NY

Position in UPB

as of Mar 31, 2026 · filed May 15, 2026
Position Value
$90,000
New position
Shares Held
10,000
first reported quarter
Ownership
0.018%
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 100% Shared 0% None 0%

Position in Biotechnology

Healthcare · as of Mar 31, 2026

Shay Capital LLC holds $19,019,662 across 39 Biotechnology names. UPB ranks #34 (0.5% 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 $90,000 10,000