SPRO
−$43.1K
55,260 sh @ $1
SPRO
Spero Therapeutics, Inc.
SEC CIK 1701108
$2.85
+24.5% · 90 days
90-day buys
$0
0 open-market
90-day sells
$63.4K
1 open-market
Net insider flow
−$63.4K
Net selling
Filings shown
39
Most recent
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At a glance
Over the last 90 days, insiders at SPRO have sold a net $63.4K of stock (0 open-market buys vs 1 sell).
Largest recent trade: Rajavelu Esther sold $119.9K of SPRO, trimming their stake 5%.
Most active filer: Rajavelu Esther, with 11 transactions among the recent filings shown.
Insider transaction history
Form 4 filings for SPRO, newest firstSPRO
+$0
266,139 sh
SPRO
+$0
100,000 sh
SPRO
+$0
751,407 sh
SPRO
−$22.4K
17,245 sh @ $1
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SPRO
−$30.6K
23,351 sh @ $1
SPRO
−$8K
5,912 sh @ $1
SPRO
−$3K
2,213 sh @ $1
SPRO
−$3.7K
2,757 sh @ $1
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About SPRO insider activity
This page tracks every recent Form 4 filed for Spero Therapeutics, Inc. with the U.S. Securities and Exchange Commission. Form 4 is the disclosure that company insiders — officers, directors, and holders of more than 10% of the stock — must file within two business days of buying or selling shares.
The summary above nets open-market purchases against open-market sales over the trailing 90 days. Open-market trades (codes P and S) tend to carry the most signal because they reflect a deliberate choice to put money in or take it out, as opposed to routine grants, option exercises, or tax-withholding events. Use the badges on each row to tell them apart, and always confirm details against the original filing before drawing conclusions.
Frequently asked questions
How often is SPRO insider data updated?
Continuously. We read from SEC EDGAR, so new Form 4 filings for Spero Therapeutics, Inc. usually appear here within minutes of being accepted by the SEC.
What does "net insider flow" mean?
It is the total dollar value of open-market insider purchases minus open-market sales over the last 90 days. A positive number (green) means insiders bought more than they sold; a negative number (red) means the reverse.
Why do some rows show grants or option exercises instead of buys?
Insiders receive stock through compensation as well as buying it outright. Form 4 captures all of these. We label each transaction by its SEC code so you can focus on open-market activity if you prefer.
Is this investment advice?
No. InsiderSource presents public filing data for informational purposes only. Insider activity is one of many factors to consider and is never a recommendation to buy or sell.