MannKind (MNKD) CEO gains stock and option vesting on milestones

Rhea-AI Filing Summary

MannKind Corp Chief Executive Officer Michael Castagna reported multiple share and option acquisitions. On March 1, 2026, he acquired 15,290 shares of common stock at $3.27 per share through the company’s Market Price Stock Purchase Plan, which was approved by the board.

Following this, his direct common stock holdings rose to 2,475,911 shares. On February 26, 2026, performance milestones were reached for stock options originally granted in 2016 and 2017, leading to partial vesting of options covering 50,000, 57,750, and 37,525 shares, increasing his directly held option awards.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Castagna Michael

(Last) (First) (Middle)

1 CASPER STREET

(Street)

DANBURY CT 06810

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MANNKIND CORP [ MNKD ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

3. Date of Earliest Transaction (Month/Day/Year)
02/26/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, $0.01 Par Value	03/01/2026		A(1)		15,290	A	$3.27	2,475,911	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Option (right to buy)	$4.55	02/26/2026		A(2)		50,000		02/26/2026	05/19/2026	Stock Options	50,000	$0.00	50,000	D
Employee Stock Option (right to buy)	$1.52	02/26/2026		A(3)		57,750		02/26/2026	05/29/2027	Stock Options	57,750	$0.00	57,750	D
Employee Stock Option (right to buy)	$1.42	02/26/2026		A(4)		37,525		02/26/2026	05/25/2027	Stock Options	37,525	$0.00	37,525	D

Explanation of Responses:

1. 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.

2. 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.

3. 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.

4. 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.

	/s/ Michael Castagna	03/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transactions did MannKind (MNKD) report for CEO Michael Castagna?

MannKind reported that CEO Michael Castagna acquired 15,290 common shares at $3.27 each and saw partial vesting of several existing stock option grants after performance milestones were achieved, increasing both his share ownership and vested option awards.

How many MannKind (MNKD) shares does the CEO hold after these transactions?

After the reported transactions, CEO Michael Castagna directly holds 2,475,911 shares of MannKind common stock. This figure reflects his position following the 15,290-share acquisition under the Market Price Stock Purchase Plan effective after board approval.

What is the price and size of the MannKind (MNKD) CEO’s recent stock purchase?

Michael Castagna acquired 15,290 MannKind common shares at a price of $3.27 per share. The shares were obtained through the company’s Market Price Stock Purchase Plan, which operates under board approval and provides stock purchases at prevailing market prices.

What stock options vested for MannKind (MNKD) CEO Michael Castagna in February 2026?

On February 26, 2026, performance milestones were met for stock options originally granted in 2016 and 2017, causing partial vesting of options covering 50,000, 57,750, and 37,525 shares. These vestings increased his directly held employee stock option rights.

How were MannKind (MNKD) CEO Michael Castagna’s new shares acquired?

The 15,290 new MannKind common shares were acquired through the company’s Market Price Stock Purchase Plan, effective May 13, 2023. The board of directors approved this specific purchase on March 1, 2026, aligning it with the plan’s established framework.

Are MannKind (MNKD) CEO Michael Castagna’s option vestings linked to performance milestones?

Yes. The options that partially vested on February 26, 2026, were originally granted in 2016 and 2017 and were structured to vest only when defined performance milestones were achieved, tying his additional vested option rights directly to meeting those performance conditions.