Summary
Updated Aug 31, 2026
Michael Castagna is Chief Executive Officer of MANNKIND CORP (MNKD). 11 SEC Form 4 filings on record going back to 2025, most recently on 18 July 2026. Most recent open-market trade: bought $259K of MNKD on 11 March 2026. Lifetime open-market purchases: $259K. Lifetime open-market sales: $1.25M.
Recent Transactions
18Every recent SEC Form 4 transaction Michael Castagna has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Michael Castagna go back to 2025: 11 primary Form 4 filings, an average of 5.5 per year. The typical open-market purchase is $259K (1 buy totaling $259K). The largest single buy on record is $259K of MNKD in 2026. Sales side: 4 recorded sales totaling $1.25M, so the filing history runs sell-heavy by dollar value. 15 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Michael Castagna 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.
- David Thomson - $931K of MNKD open-market activity in the last 12 months
- Stuart A. Tross - $549K of MNKD open-market activity in the last 12 months
- Steven B. Binder - $427K of MNKD open-market activity in the last 12 months
- Sanjay R. Singh - $94K of MNKD 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 Michael Castagna?
Michael Castagna is a corporate insider, tracked as Chief Executive Officer of MANNKIND CORP (MNKD). InsiderAlpha holds 11 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 Michael Castagna submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Has Michael Castagna been buying or selling stock?
Recorded transactions: 1 open-market purchase ($259K) and 4 open-market sales ($1.25M) across all tracked filings.
Where can I see all of Michael Castagna'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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