Mirum Pharma CEO exercises 5,305 and 6,892 options

The CEO also reported 187,500 common shares held indirectly through The Peetz Family Trust.

Rhea-AI Filing Summary

Mirum Pharmaceuticals, Inc. CEO Christopher Peetz exercised fully vested options on October 6, 2026, to acquire 5,305 common shares at an exercise price of $19.19 per share and 6,892 common shares at $15.87 per share. The reported transactions dispose of the options and acquire the underlying shares. A separate holding entry reports 187,500 common shares held indirectly through The Peetz Family Trust.

Insider Trade Summary

12,197 shares exercised/converted

Exercise 5 txns

Insider Peetz Christopher

Role CHIEF EXECUTIVE OFFICER

Type	Security	Shares	Price	Value
Exercise	Employee Stock Option (right to buy) F1	5,305	$0.00	$0.00
Exercise	Employee Stock Option (right to buy) F1	6,892	$0.00	$0.00
Exercise	Common Stock	5,305	$19.19	$102K
Exercise	Common Stock	6,892	$15.87	$109K
holding	Common Stock	--	--	--

Holdings After Transaction: Employee Stock Option (right to buy) — 402,803 contracts (Direct); Common Stock — 206,637 shares (Direct); Common Stock — 187,500 shares (Indirect, By The Peetz Family Trust)

Footnotes (1)

1. F1. The stock option is fully vested.

Key Figures

Options exercised: 5,305 options Exercise price: $19.19 per share Options exercised: 6,892 options +2 more

5 metrics

Options exercised 5,305 options October 6, 2026; expiration January 6, 2031

Exercise price $19.19 per share For the 5,305 options exercised October 6, 2026

Options exercised 6,892 options October 6, 2026; expiration January 5, 2032

Exercise price $15.87 per share For the 6,892 options exercised October 6, 2026

Common shares held indirectly 187,500 shares Through The Peetz Family Trust

Key Terms

Employee Stock Option (right to buy), fully vested, derivative security

3 terms

Employee Stock Option (right to buy) financial

"Employee Stock Option (right to buy)"

fully vested financial

"The stock option is fully vested."

derivative security technical

"Exercise or conversion of derivative security"

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

FAQ

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

What MIRM stock options did CEO Christopher Peetz exercise?

Christopher Peetz exercised 5,305 options at $19.19 per share and 6,892 options at $15.87 per share on October 6, 2026, acquiring the same respective numbers of common shares.

When do Christopher Peetz's exercised MIRM options expire?

The 5,305 options expire January 6, 2031, and the 6,892 options expire January 5, 2032.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Available on EDGAR 10/06/2026 - 08:38 PM Accepted by SEC EDGAR 10/06/2026 - 08:38 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^*

Peetz Christopher

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CHIEF EXECUTIVE OFFICER

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/06/2026

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	10/06/2026		M		5,305	A	$19.19	199,745	D
Common Stock	10/06/2026		M		6,892	A	$15.87	206,637	D
Common Stock								187,500	I	By The Peetz Family Trust

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)	$19.19	10/06/2026		M			5,305	(1)	01/06/2031	Common Stock	5,305	$0	169,695	D
Employee Stock Option (right to buy)	$15.87	10/06/2026		M			6,892	(1)	01/05/2032	Common Stock	6,892	$0	233,108	D

Explanation of Responses:

1. The stock option is fully vested.

	/s/ Judit Ryvkin, Attorney-in-Fact	10/06/2026
	** 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)