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DIADEMA PARTNERS LP

Position in UPB — Upstream Bio, Inc.

CIK 2026172 MORRISTOWN, NJ

Position in UPB

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$132,123
-$62,358 QoQ
Shares Held
19,093
-11.6% QoQ
Ownership
0.035%
of shares outstanding
% of Portfolio
0.05%
of 13F equity value
Holder Rank
#91
of 148 holders
Holding Since
Sep 2025
4 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in UPB Over Time

Shares Held

Position Value (USD)

Derivatives in UPB

reported options exposure · as of Sep 30, 2025
CallValue
$3,762,000
CallShares
200,000
PutValue
$0
PutShares
0

Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.

Position in Biotechnology

Healthcare · as of Jun 30, 2026

DIADEMA PARTNERS LP holds $217,374,297 across 66 Biotechnology names. UPB ranks #58 (0.1% 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 $132,123 19,093
2026-03-31 $194,481 21,609
2025-12-31 $556,575 20,500
2025-09-30 $3,762,000 200,000