Castagna Michael purchased ~$259K in MannKind Corporation stock
MannKind Corporation (MNKD) · Chief Executive Officer · Data via SEC EDGAR Form 4
Price Performance · 10 days before → 90 days after trade
▲ = insider buy date
Trade Details · Public SEC Filing
Insider
Castagna Michael
Role
Chief Executive Officer
Transaction
Open-Market Purchase
Approx. Value
~$259K
Trade Date
Mar 10, 2026
Company
MannKind Corporation
Ticker
MNKDSource
SEC EDGAR Form 4
Why This Trade Stands Out
Strong conviction signal
Scored above average across multiple factors. Roughly 15% of insider trades qualify as Strong.
~$259K purchase
A meaningful investment of personal capital. The average insider purchase is around $150K, putting this in the typical range for serious positions.
Chief Executive Officer
CEOs have the deepest knowledge of company operations. Academic research shows CEO purchases outperform other insider trades by a wide margin.
How good is Castagna Michael at picking stocks?
Full track record: win rate, average return, and performance vs S&P 500
On March 10, 2026, Castagna Michael — Chief Executive Officer of MannKind Corporation — filed a Form 4 with the SEC disclosing an open-market purchase of approximately ~$259K in MannKind Corporation (MNKD) stock.
Under Section 16(a) of the Securities Exchange Act of 1934, corporate insiders must report all open-market stock transactions to the SEC within two business days. These filings — known as Form 4s — are publicly available on the SEC's EDGAR database. VeritySignals filters and scores the full Form 4 stream to surface high-conviction signals like this one.
VeritySignals Conviction Analysis
Full Conviction Analysis
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All data sourced from publicly available SEC Form 4 filings via EDGAR · Not financial advice · Past performance does not guarantee future results.
At a Glance
More MNKD Insider Activity
Castagna Michael
Mar 10, 2026
~$1.0M
VS
Castagna Michael
Mar 10, 2026
~$1.0M
VS
Castagna Michael
Jul 31, 2022
~$40K
STRONG
Castagna Michael
Feb 28, 2022
~$683K
VS
How to Read Insider Trades
What is this?
When company executives buy or sell their own stock, they must report it to the SEC within 2 days. These public filings reveal what the people who know the company best are doing with their own money.
Why does it matter?
Insiders can sell for many reasons (taxes, diversification, expenses), but they generally only buy for one: they think the stock is going up. That's why insider purchases are more predictive than sales.
What makes a trade "strong"?
We score trades on 15+ factors: the insider's role (CEO > director), trade size relative to their salary, whether other insiders also bought (clusters), and historical accuracy of the insider.
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