MannKind (MNKD) HR chief adds stock and performance-based options

Rhea-AI Filing Summary

MannKind Corp executive Stuart A. Tross reported acquisitions of both stock and options. He obtained 15,290 shares of common stock at $3.27 per share through MannKind’s Market Price Stock Purchase Plan, bringing his direct holdings to 1,000,297 common shares. He also acquired stock options for 20,000 and 28,143 shares after performance milestones from 2017 option grants were met on February 26, 2026, resulting in partial vesting of those 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^*

Tross Stuart A

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief People & Workpl 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	1,000,297	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)		20,000		02/26/2026	02/15/2027	Stock Options	20,000	$0.00	20,000	D
Employee Stock Option (right to buy)	$1.42	02/26/2026		A(3)		28,143		02/26/2026	05/25/2027	Stock Options	28,143	$0.00	28,143	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 February 16, 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.

3. 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/ Stuart A. Tross	03/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

What insider transactions did MannKind (MNKD) report for Stuart A. Tross?

Stuart A. Tross reported acquiring common shares and options in MannKind. He obtained 15,290 common shares through the Market Price Stock Purchase Plan and received vested stock options covering 20,000 and 28,143 shares when defined performance milestones were achieved in February 2026.

How many MannKind (MNKD) common shares does Stuart A. Tross now hold?

After the reported transaction, Stuart A. Tross directly holds 1,000,297 MannKind common shares. This figure reflects the addition of 15,290 shares purchased at $3.27 per share through the company’s Market Price Stock Purchase Plan approved by the board on March 1, 2026.

At what price did Stuart A. Tross acquire new MannKind (MNKD) common stock?

He acquired 15,290 MannKind common shares at a price of $3.27 per share. The purchase occurred through MannKind’s Market Price Stock Purchase Plan, which became effective on May 13, 2023, and this particular transaction was approved by the board on March 1, 2026.

What stock options were granted or vested for Stuart A. Tross at MannKind (MNKD)?

Tross reported acquisition of options relating to 20,000 and 28,143 MannKind shares. These stem from options originally granted in 2017 that vest upon performance milestones. On February 26, 2026, specific milestones were met, triggering partial vesting and recognition of these derivative holdings.

Were the MannKind (MNKD) insider option awards tied to performance milestones?

Yes. The options were granted in 2017 and vest only when defined performance milestones are achieved. On February 26, 2026, one milestone was met for each grant, causing partial vesting of the options covering 20,000 and 28,143 underlying MannKind common shares, respectively.

What is MannKind’s Market Price Stock Purchase Plan mentioned in the Form 4?

The Market Price Stock Purchase Plan is a program under which securities can be purchased at market price. It became effective on May 13, 2023, and the 15,290-share purchase by Stuart A. Tross at $3.27 per share was conducted under this plan with board approval.