Michael Castagna - 11 May 2026 Form 4 Insider Report for MANNKIND CORP (MNKD)

Reporting relationship: Chief Executive Officer, Director
Issuer ticker: MNKD
Reported as of: 11 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 13 May 2026, 20:30:04 UTC
Prior SEC filing: 25 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Michael Castagna

Key filing fact

Michael Castagna filed Form 4 for MANNKIND CORP (MNKD) on 13 May 2026.

Key facts

This page summarizes Michael Castagna's Form 4 filing for MANNKIND CORP (MNKD).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 13 May 2026, 20:30.

Change

Previous filing in this sequence was filed on 25 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001674282 Primary reporting owner

Castagna Michael

Relationship: Chief Executive Officer, Director
Address: 1 CASPER STREET, DANBURY
Signature: /s/ Michael Castagna
Signature date: 13 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MNKD transaction

Common Stock, $0.01 Par Value

Tax liability

Transaction value
Shares: -34,957
Change %: -1.4%
Price: $3.52^*
Shares after: 2,442,310
Date: 11 May 2026
Ownership: Direct
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Represents shares withheld to pay tax withholding obligations due on the date of vesting of the Restricted Stock Units originally granted on May 10, 2022.

Footnote F2

Includes 1,356 shares acquired under the Issuer's Employee Stock Purchase Plan on December 31, 2025.