Mirum Pharmaceuticals' Howe exercises 16,112 options

After the exercise, SVP, Global Controller Jolanda Howe reported 16,728 common shares and 8,888 options.

Rhea-AI Filing Summary

Mirum Pharmaceuticals, Inc. SVP, Global Controller Jolanda Howe exercised 16,112 employee stock options on October 16, 2026, acquiring 16,112 common shares at an exercise price of $19.24 per share. The option was fully vested. After the transaction, the option row lists 8,888 options, and Howe’s reported common-stock holdings were 16,728 shares.

Insider Trade Summary

16,112 shares exercised/converted

Exercise 2 txns

Insider Howe Jolanda

Role SVP, GLOBAL CONTROLLER

Type	Security	Shares	Price	Value
Exercise	Employee Stock Option (right to buy) F1	16,112	$0.00	$0.00
Exercise	Common Stock	16,112	$19.24	$310K

Holdings After Transaction: Employee Stock Option (right to buy) — 8,888 contracts (Direct); Common Stock — 16,728 shares (Direct)

Footnotes (1)

1. F1. The stock option is fully vested.

Key Figures

Employee stock options exercised: 16,112 options Exercise price: $19.24 per share Common shares acquired: 16,112 shares +2 more

5 metrics

Employee stock options exercised 16,112 options October 16, 2026

Exercise price $19.24 per share Employee stock option exercise on October 16, 2026

Common shares acquired 16,112 shares October 16, 2026

Options following transaction 8,888 options Reported after the October 16, 2026 exercise

Common shares following transaction 16,728 shares Reported after the October 16, 2026 exercise

Key Terms

Employee Stock Option, fully vested, exercise price

3 terms

Employee Stock Option financial

"the 16,112-share employee stock option exercise"

An employee stock option is a promise that lets a worker buy company shares later at a predetermined price, often after they stay for a certain period or meet performance goals — think of it like a coupon that locks in today's price for a future purchase. It matters to investors because options align employees’ incentives with company performance, can increase the number of shares outstanding (dilution) when exercised, and represent a compensation cost that affects reported profits and shareholder value.

fully vested financial

"the stock option is fully vested"

exercise price financial

"the options exercised at $19.24 per share"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

FAQ

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

How many MIRM options did Jolanda Howe exercise, and at what price?

Jolanda Howe exercised 16,112 employee stock options on October 16, 2026, at an exercise price of $19.24 per share, acquiring 16,112 shares of common stock. The option was fully vested.

How many MIRM shares did Jolanda Howe hold after the option exercise?

After the October 16, 2026 transaction, Jolanda Howe reported 16,728 shares of common stock. The option transaction also lists 8,888 options following the exercise.

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

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Available on EDGAR 10/19/2026 - 04:10 PM EDT Accepted by SEC EDGAR 10/19/2026 - 04:10 PM EDT 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^*

Howe Jolanda

(Last) (First) (Middle)

C/O MIRUM PHARMACEUTICALS, INC.

989 E HILLSDALE BLVD., SUITE 300

(Street)

FOSTER CITY CALIFORNIA 94404

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Mirum Pharmaceuticals, Inc. [ MIRM ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP, GLOBAL CONTROLLER

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/16/2026

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	10/16/2026		M		16,112	A	$19.24	16,728	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
Employee Stock Option (right to buy)	$19.24	10/16/2026		M			16,112	(1)	01/09/2030	Common Stock	16,112	$0	8,888	D

Explanation of Responses:

1. The stock option is fully vested.

	/s/ Judit Ryvkin, Attorney-in-Fact	10/19/2026
	** 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)