Michael Castagna - 26 Feb 2026 Form 4 Insider Report for MANNKIND CORP (MNKD)

Role: Chief Executive Officer, Director
Signature: /s/ Michael Castagna
Issuer symbol: MNKD
Transactions as of: 26 Feb 2026
Net transactions value: +$49,998
Form type: 4
Filing time: 02 Mar 2026, 21:50:07 UTC
Previous filing: 29 Dec 2025
Next filing: 10 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Castagna Michael	Chief Executive Officer, Director	1 CASPER STREET, DANBURY	/s/ Michael Castagna	02 Mar 2026	0001674282

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	MNKD	Common Stock, $0.01 Par Value	Award	$49,998	+15,290	+0.62%	$3.27	2,475,911	01 Mar 2026	Direct	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	MNKD	Employee Stock Option (right to buy)	Award	$0	+50,000		$0.000000	50,000	26 Feb 2026	Stock Options	50,000	$4.55	Direct	F2
transaction	MNKD	Employee Stock Option (right to buy)	Award	$0	+57,750		$0.000000	57,750	26 Feb 2026	Stock Options	57,750	$1.52	Direct	F3
transaction	MNKD	Employee Stock Option (right to buy)	Award	$0	+37,525		$0.000000	37,525	26 Feb 2026	Stock Options	37,525	$1.42	Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The securities were purchased through the Issuer's Market Price Stock Purchase Plan effective May 13, 2023. The purchase was approved by the Company's Board of Directors on March 1, 2026.
F2	On May 19, 2016, the reporting person was granted an option that vests upon the achievement of certain defined performance milestones. On February 26, 2026, one of the defined performance milestones was met, resulting in the partial vesting of the option.
F3	On May 29, 2017, the reporting person was granted an option that vests upon the achievement of certain defined performance milestones. On February 26, 2026, one of the defined performance milestones was met, resulting in the partial vesting of the option.
F4	On May 25, 2017, the reporting person was granted an option that vests upon the achievement of certain defined performance milestones. On February 26, 2026, one of the defined performance milestones was met, resulting in the partial vesting of the option.