SPRO Insider Buying — Recent SEC Form 4 Activity
Track insider buying activity for Spero Therapeutics, Inc. ($SPRO). See every SEC Form 4 purchase by CEOs, CFOs, directors, and 10% owners over the last 90 days — sourced directly from EDGAR.
No insider purchases recorded for Spero Therapeutics, Inc. (SPRO) in the past 90 days.
Recent Insider Purchases at Spero Therapeutics, Inc.
Frequently Asked — SPRO Insider Buying
What is SPRO insider buying?
$SPRO insider buying refers to open-market purchases of Spero Therapeutics, Inc. stock by corporate insiders — officers, directors, and shareholders owning more than 10% of the company. Every purchase is disclosed to the SEC on Form 4 within two business days and is shown on this page.
Why does SPRO insider activity matter?
Insiders have the best view into Spero Therapeutics, Inc.'s operations. When they buy their own stock with personal money — rather than selling option grants — it signals conviction. Clusters of insider buying (two or more insiders purchasing within 14 days) have historically preceded above-market returns.
Where does this SPRO insider data come from?
Every transaction on this page is sourced directly from SEC EDGAR Form 4 filings. InsiderAct ingests these filings in near real time and filters for open-market purchases (transaction code P).
How do I get alerts when SPRO insiders buy?
Add $SPRO to your InsiderAct watchlist and enable email alerts. You'll be notified when a new Form 4 purchase is filed — usually within hours of the transaction.
What is a "cluster buy" signal?
InsiderAct flags a cluster buy when two or more independent insiders at the same company buy on the open market within a 14-day window. Cluster buys are the highest-conviction insider signal we track.
Related Insider Activity
Other stocks with recent insider buying on SEC Form 4
Want alerts when SPRO insiders buy?
Add $SPRO to your watchlist and get notified the moment a new Form 4 is filed.
Data sourced from SEC Form 4 filings via EDGAR. Read more: What is SEC Form 4?