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Flock — Smart-money disclosures, made readable

Upstream Bio Inc

UPBNASDAQ · US

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Holders

Renaissance Technologies
13F filer
$558.9K
62,100 sh
as-of 31 Mar 2026Quarterly

Ownership

Ownership data not yet available for this security.

Disclosure timeline

DISCLOSEDQuarterly
Renaissance Technologies
Upstream Bio Inc · NASDAQ
62,100 sh · $558.9K
Filed 31 Mar 2026SEC 13Fview source

Announcements

No announcements on record for this security.

UPBNASDAQ · US

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Latest filing31 Mar 2026Stale

1 disclosed holder · 1 disclosure · 0 announcements

Ownership

Ownership data not yet available for this security.

Announcements

No announcements on record for this security.