Michael Castagna - 12 Dec 2025 Form 4 Insider Report for MANNKIND CORP (MNKD)

Signature
/s/ Michael Castagna
Issuer symbol
MNKD
Transactions as of
12 Dec 2025
Net transactions value
-$61,068
Form type
4
Filing time
16 Dec 2025, 20:15:15 UTC
Previous filing
04 Dec 2025
Next filing
19 Dec 2025

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Castagna Michael Chief Executive Officer, Director 1 CASPER STREET, DANBURY /s/ Michael Castagna 16 Dec 2025 0001674282

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MNKD Common Stock, $0.01 Par Value Options Exercise $94,667 +20,806 +0.83% $4.55 2,525,598 12 Dec 2025 Direct
transaction MNKD Common Stock, $0.01 Par Value Sale $124,836 -20,806 -0.82% $6.00 2,504,792 12 Dec 2025 Direct F1
transaction MNKD Common Stock, $0.01 Par Value Options Exercise $96,960 +21,310 +0.85% $4.55 2,526,102 16 Dec 2025 Direct
transaction MNKD Common Stock, $0.01 Par Value Sale $127,860 -21,310 -0.84% $6.00 2,504,792 16 Dec 2025 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) Options Exercise $0 -7,920 -100% $0.000000 0 12 Dec 2025 Common Stock, $0.01 Par Value 7,920 $4.55 Direct
transaction MNKD Employee Stock Option (Right to Buy) Options Exercise $0 -12,886 -26% $0.000000 37,114 12 Dec 2025 Common Stock, $0.01 Par Value 12,886 $4.55 Direct
transaction MNKD Employee Stock Option (Right to Buy) Options Exercise $0 -21,310 -57% $0.000000 15,804 16 Dec 2025 Common Stock, $0.01 Par Value 21,310 $4.55 Direct
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

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).

Explanation of Responses:

Id Content
F1 Transaction occurred pursuant to Rule 10b5-1 Plan established August 8, 2025.