MannKind CEO buys 100,000 shares in open market

MannKind Corp CEO Michael Castagna purchased 100,000 shares of common stock in an open-market transaction at a weighted average price of $2.59 per share on March 10, 2026.

Rhea-AI Filing Summary

MannKind Corp CEO Michael Castagna purchased 100,000 shares of common stock in an open-market transaction at a weighted average price of $2.59 per share on March 10, 2026. Following this purchase, he directly owns 2,575,911 shares. An additional 1,500 shares are held indirectly through his spouse.

Insider Trade Summary

Net Buyer: 100,000 shares

Net Buy 2 txns

Insider Castagna Michael

Role Chief Executive Officer

Bought 100,000 shs ($259K)

Type	Security	Shares	Price	Value
Purchase	Common Stock, $0.01 Par Value	100,000	$2.59	$259K
holding	Common Stock $0.01 Par Value	--	--	--

Holdings After Transaction: Common Stock, $0.01 Par Value — 2,575,911 shares (Direct); Common Stock $0.01 Par Value — 1,500 shares (Indirect, By Spouse)

Footnotes (1)

1. F1. The weighted average purchase price of the reported transaction was $2.59 based on a range of prices between $2.58 and $2.60. Upon request by the SEC staff, the Issuer, or any security holder of the Issuer, full information regarding the number of shares purchased at each separate price will be provided.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

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

Michael Castagna bought 100,000 MannKind shares in the open market. The purchase occurred on March 10, 2026, and involved common stock with a par value of $0.01 per share, reflecting a direct increase in his personal equity stake.

At what price did the MannKind (MNKD) CEO buy his recent shares?

The weighted average purchase price was $2.59 per share, based on trades executed in a range between $2.58 and $2.60. Detailed breakdowns by exact price level are available upon request from the company, the SEC staff, or any MannKind security holder.

How many MannKind (MNKD) shares does Michael Castagna own after this trade?

After the transaction, Michael Castagna directly holds 2,575,911 shares of MannKind common stock. The Form 4 also shows an additional 1,500 shares held indirectly through his spouse, reflecting total reported direct and indirect positions in the company.

Was the MannKind (MNKD) CEO’s recent share purchase an open-market transaction?

Yes, the filing classifies the transaction as an open-market purchase under code P. This means the CEO bought 100,000 MannKind common shares on the market rather than through an option exercise, grant, or other non-market mechanism.

Does the MannKind (MNKD) Form 4 show any insider share sales?

No insider sales are reported in this Form 4. The transaction summary shows one open-market purchase of 100,000 shares and no sales, with a net-buy direction, indicating only buying activity in the reported period.

How are the MannKind (MNKD) CEO’s spouse-held shares reported?

The Form 4 reports 1,500 shares held indirectly by the CEO’s spouse. These are classified as indirect ownership with the nature of ownership noted as “By Spouse,” separate from his 2,575,911 directly held MannKind common shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/10/2026 - 09:30 PM Learn about SEC filing dates

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^*

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)
03/10/2026

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	03/10/2026		P		100,000	A	$2.59(1)	2,575,911	D
Common Stock $0.01 Par Value								1,500	I	By Spouse

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. The weighted average purchase price of the reported transaction was $2.59 based on a range of prices between $2.58 and $2.60. Upon request by the SEC staff, the Issuer, or any security holder of the Issuer, full information regarding the number of shares purchased at each separate price will be provided.

	/s/ Michael Castagna	03/10/2026
	** 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.