Michael Castagna - 17 Dec 2025 Form 4 Insider Report for MANNKIND CORP (MNKD)

Signature
/s/ Michael Castagna
Issuer symbol
MNKD
Transactions as of
17 Dec 2025
Net transactions value
-$96,074
Form type
4
Filing time
19 Dec 2025, 20:00:03 UTC
Previous filing
16 Dec 2025
Next filing
29 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 19 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 $299,408 +65,804 +2.6% $4.55 2,570,596 17 Dec 2025 Direct
transaction MNKD Common Stock, $0.01 Par Value Sale $395,482 -65,804 -2.6% $6.01 2,504,792 17 Dec 2025 Direct F1, F2

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 -15,804 -100% $0.000000 0 17 Dec 2025 Common Stock, $0.01 Par Value 15,804 $4.55 Direct
transaction MNKD Employee Stock Option (Right to Buy) Options Exercise $0 -50,000 -100% $0.000000 0 17 Dec 2025 Common Stock, $0.01 Par Value 50,000 $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.
F2 The weighted average sales price of the reported transaction was $6.01 based on a range of prices between $6.00 and $6.04. Upon request by the SEC staff, the Issuer, or any security holder of the Issuer, full information regarding the number of shares sold at each separate price will be provided.