MannKind (MNKD) CFO has shares withheld for RSU tax obligations

Rhea-AI Filing Summary

MannKind Corp Chief Financial Officer Christopher B. Prentiss reported a routine tax-withholding share disposition. On April 22, 2026, 12,267 shares of common stock at $2.74 per share were withheld to cover taxes on Restricted Stock Units that vested from a grant dated May 15, 2024. After this, he directly held 338,924 shares, including 2,337 shares acquired through the Employee Stock Purchase Plan on December 31, 2025.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Prentiss Christopher B

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock, $0.01 Par Value	12,267	$2.74	$34K

Holdings After Transaction: Common Stock, $0.01 Par Value — 338,924 shares (Direct, null)

Footnotes (1)

1. Represents shares withheld to pay tax withholding obligations due on the date of vesting of the Restricted Stock Units originally granted on May 15, 2024. Includes 2,337 shares acquired under the Issuer's Employee Stock Purchase Plan on December 31, 2025.

Key Figures

Tax-withholding shares: 12,267 shares Withholding price: $2.74 per share Shares after transaction: 338,924 shares +2 more

5 metrics

Tax-withholding shares 12,267 shares Withheld on April 22, 2026 to cover RSU tax obligations

Withholding price $2.74 per share Price used for tax-withholding disposition on 12,267 shares

Shares after transaction 338,924 shares Direct MannKind common stock holdings following the April 22, 2026 event

ESPP shares included 2,337 shares Acquired under the Employee Stock Purchase Plan on December 31, 2025

RSU grant date May 15, 2024 Original grant date of Restricted Stock Units that vested, triggering tax withholding

Key Terms

Restricted Stock Units, tax withholding obligations, Employee Stock Purchase Plan, Common Stock, $0.01 Par Value

4 terms

Restricted Stock Units financial

"vesting of the Restricted Stock Units originally granted on May 15, 2024"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligations financial

"shares withheld to pay tax withholding obligations due on the date of vesting"

Employee Stock Purchase Plan financial

"Includes 2,337 shares acquired under the Issuer's Employee Stock Purchase Plan"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

Common Stock, $0.01 Par Value financial

"security_title": "Common Stock, $0.01 Par Value""

Form 4 Insider Transactions: What Each Field Means →

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Prentiss Christopher B

(Last) (First) (Middle)

1 CASPER STREET

(Street)

DANBURY CONNECTICUT 06810

(City) (State) (Zip)

UNITED STATES

(Country)

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 Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/22/2026

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

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

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

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	04/22/2026		F		12,267(1)	D	$2.74	338,924(2)	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

Explanation of Responses:

1. Represents shares withheld to pay tax withholding obligations due on the date of vesting of the Restricted Stock Units originally granted on May 15, 2024.

2. Includes 2,337 shares acquired under the Issuer's Employee Stock Purchase Plan on December 31, 2025.

	/s/ Christopher Prentiss	04/24/2026
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What did MannKind (MNKD) CFO Christopher Prentiss report in this Form 4?

He reported a tax-related share disposition, not an open-market trade. On April 22, 2026, 12,267 MannKind common shares were withheld at $2.74 per share to satisfy tax obligations on vesting Restricted Stock Units granted on May 15, 2024.

Was the MannKind (MNKD) CFO’s Form 4 transaction a stock sale on the market?

No, it was a tax-withholding event, not an open-market sale. Shares were automatically withheld by the company to cover tax obligations when Restricted Stock Units vested, which is a common administrative step in equity compensation.

How many MannKind (MNKD) shares does the CFO hold after this Form 4 transaction?

After the tax-withholding disposition, Christopher B. Prentiss directly held 338,924 MannKind common shares. This total includes 2,337 shares previously acquired through the company’s Employee Stock Purchase Plan on December 31, 2025, according to the filing footnotes.

What triggered the tax withholding for the MannKind (MNKD) CFO’s shares?

The withholding was triggered by the vesting of Restricted Stock Units originally granted on May 15, 2024. When these RSUs vested, 12,267 shares were withheld on April 22, 2026 to cover the associated tax withholding obligations at a reported price of $2.74 per share.

What is mentioned about MannKind (MNKD) Employee Stock Purchase Plan in this Form 4?

The filing notes that the CFO’s holdings include 2,337 shares acquired under MannKind’s Employee Stock Purchase Plan on December 31, 2025. This ESPP participation adds to his direct ownership position beyond the Restricted Stock Unit awards.