Jolanda Howe - Aug 7, 2025 Form 4 Insider Report for Mirum Pharmaceuticals, Inc. (MIRM)

Signature
/s/ Judit Ryvkin, Attorney-in-Fact
Stock symbol
MIRM
Transactions as of
Aug 7, 2025
Transactions value $
-$517,300
Form type
4
Date filed
8/8/2025, 04:50 PM
Previous filing
Jul 3, 2025

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Howe Jolanda SVP, GLOBAL CONTROLLER C/O MIRUM PHARMACEUTICALS, INC., 989 E HILLSDALE BLVD., SUITE 300, FOSTER CITY /s/ Judit Ryvkin, Attorney-in-Fact 2025-08-08 0001974200

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MIRM Common Stock Options Exercise $62.7K +10K +412.2% $6.27 12.4K Aug 7, 2025 Direct
transaction MIRM Common Stock Sale -$580K -10K -80.48% $58.00 2.43K Aug 7, 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 MIRM Employee Stock Option (right to buy) Options Exercise $0 -10K -20% $0.00 40K Aug 7, 2025 Common Stock 10K $6.27 Direct F2
* 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 Reported transaction occurred pursuant to a Rule 10b5-1 Plan adopted by the reporting person on December 16, 2024.
F2 The stock option is fully vested.