Summary
Updated Aug 30, 2026
Cynthia Smith files SEC Form 4 reports at Spero Therapeutics, Inc. (SPRO). 6 SEC Form 4 filings on record going back to 2025, most recently on 25 June 2026.
Recent Transactions
4Every recent SEC Form 4 transaction Cynthia Smith has reported, most recent first.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Cynthia Smith files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Sarah Gheuens - $1.55M of AGIO open-market activity in the last 12 months
- Brian Goff - $1.18M of AGIO open-market activity in the last 12 months
- John P. Butler - $561K of AKBA open-market activity in the last 12 months
- Theodore James Washburn Jr. - $532K of AGIO open-market activity in the last 12 months
- Esther Rajavelu - $407K of SPRO open-market activity in the last 12 months
- Cecilia Jones - $389K of AGIO open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is Cynthia Smith?
Cynthia Smith is a corporate insider of Spero Therapeutics, Inc. (SPRO). InsiderAlpha holds 6 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has Cynthia Smith submitted recently?
5 primary Form 4 filings in the last 90 days, covering 5 companies.
Where can I see all of Cynthia Smith's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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