Flock Feed Overlaps Watchlist Portfolio Insider Calendar Search Account

Feed
Overlap
Watch
Folio
Insider
Cal
Search
Me

Flock — Smart-money disclosures, made readable

Spero Therapeutics Inc

SPRONASDAQ · US

Sign in for alerts Sign in to add to portfolio

Holders

Renaissance Technologies
13F filer
$2.8M
1,189,235 sh
as-of 31 Mar 2026Quarterly
Two Sigma Investments
13F filer
$2.1M
885,631 sh
as-of 31 Mar 2026Quarterly
BlackRock
13F filer
$628.4K
483,402 sh
as-of 30 Jun 2024Stale

Ownership

Ownership data not yet available for this security.

Disclosure timeline

DISCLOSEDQuarterly
Renaissance Technologies
Spero Therapeutics Inc · NASDAQ
1,189,235 sh · $2.8M
Filed 31 Mar 2026SEC 13Fview source
DISCLOSEDQuarterly
Two Sigma Investments
Spero Therapeutics Inc · NASDAQ
885,631 sh · $2.1M
Filed 31 Mar 2026SEC 13Fview source
DISCLOSEDStale
BlackRock
Spero Therapeutics Inc · NASDAQ
483,402 sh · $628.4K
Filed 30 Jun 2024SEC 13Fview source

Announcements

No announcements on record for this security.

SPRONASDAQ · US

Sign in for alerts Sign in to add to portfolio

Latest filing31 Mar 2026Stale

3 disclosed holders · 3 disclosures · 0 announcements

Ownership

Ownership data not yet available for this security.

Announcements

No announcements on record for this security.