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Mirum Pharmaceuticals (MIRM) director granted options and 1,980 deferred stock units

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Mirum Pharmaceuticals director Laura Brege reported equity awards consisting of deferred stock units and stock options. She received 1,980 deferred stock units, each representing a contingent right to one share of common stock, and 3,772 stock options to buy common stock at an exercise price of $101.00 per share.

Both the options and deferred stock units vest on the first anniversary of the June 15, 2026 grant date, and in any case will be fully vested by the company’s 2027 annual stockholder meeting. The options expire on June 14, 2036. Vested deferred stock units will be settled in common stock upon a change in control of Mirum or within 60 days after Brege’s separation from service.

Positive

  • None.

Negative

  • None.
Insider Brege Laura
Role null
Type Security Shares Price Value
Grant/Award Stock Option (right to buy) 3,772 $0.00 --
Grant/Award Deferred Stock Units 1,980 $0.00 --
Holdings After Transaction: Stock Option (right to buy) — 3,772 shares (Direct, null); Deferred Stock Units — 1,980 shares (Direct, null)
Footnotes (1)
  1. The shares vest on the first anniversary of the grant date, provided that the option will in any case be fully vested on the date of the Issuer's 2027 annual stockholder meeting. Each deferred stock unit represents a contingent right to receive one share of the Issuer's common stock and will vest on the first anniversary of the grant date, provided that it will in any case be fully vested on the date of the Issuer's 2027 annual stockholder meeting. Each vested deferred stock unit will be paid out in the Issuer's common stock upon the earliest to occur of (i) a change in control of the Issuer and (ii) within 60 days following separation from service with the Issuer.
Deferred stock units granted 1,980 units Grant to director Laura Brege on June 15, 2026
Stock options granted 3,772 options Director award on June 15, 2026
Option exercise price $101.00 per share Stock Option (right to buy) grant
Option expiration date June 14, 2036 Mirum stock options issued to director
Underlying shares for DSUs 1,980 shares Each deferred stock unit equals one common share
Underlying shares for options 3,772 shares Stock options for Mirum common stock
Deferred Stock Units financial
"Each deferred stock unit represents a contingent right to receive one share of the Issuer's common stock"
Deferred stock units are promises from a company to give an employee shares of stock at a future date, often after certain conditions are met or after leaving the company. They function like a form of delayed compensation, allowing employees to earn shares over time. For investors, they represent potential future ownership in the company, but do not provide immediate voting rights or dividends until the shares are actually received.
Stock Option (right to buy) financial
"Stock Option (right to buy) with an exercise price of 101.0000"
exercise price financial
"conversion_or_exercise_price": "101.0000""
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.
change in control financial
"paid out in the Issuer's common stock upon the earliest to occur of (i) a change in control of the Issuer"
A "change in control" occurs when the ownership or management of a company shifts significantly, such as through a merger, acquisition, or sale of a large part of its assets. This change can impact how the company is run and may influence its future direction. For investors, it matters because it can affect the company's stability, strategy, and value, often signaling potential changes in investment risk or opportunity.
separation from service financial
"within 60 days following separation from service with the Issuer"
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SEC Form 4
FORM 4UNITED 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*
Brege Laura

(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)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/15/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Stock Option (right to buy)$10106/15/2026A3,772 (1)06/14/2036Common Stock3,772$03,772D
Deferred Stock Units(2)06/15/2026A1,980 (2) (2)Common Stock1,980$01,980D
Explanation of Responses:
1. The shares vest on the first anniversary of the grant date, provided that the option will in any case be fully vested on the date of the Issuer's 2027 annual stockholder meeting.
2. Each deferred stock unit represents a contingent right to receive one share of the Issuer's common stock and will vest on the first anniversary of the grant date, provided that it will in any case be fully vested on the date of the Issuer's 2027 annual stockholder meeting. Each vested deferred stock unit will be paid out in the Issuer's common stock upon the earliest to occur of (i) a change in control of the Issuer and (ii) within 60 days following separation from service with the Issuer.
/s/ Doug Sheehy, Attorney-in-Fact06/17/2026
** Signature of Reporting PersonDate
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)

FAQ

What insider transactions did Mirum Pharmaceuticals (MIRM) report for Laura Brege?

Mirum reported that director Laura Brege received equity awards on June 15, 2026. She was granted 1,980 deferred stock units and 3,772 stock options, both tied to Mirum common stock as part of her director compensation package.

How many stock options did Laura Brege receive from Mirum Pharmaceuticals (MIRM) and at what price?

Laura Brege received 3,772 stock options from Mirum Pharmaceuticals. Each option allows her to buy one share of Mirum common stock at an exercise price of $101.00 per share, with the options expiring on June 14, 2036.

When do Laura Brege’s Mirum (MIRM) stock options and deferred stock units vest?

Both the 3,772 stock options and 1,980 deferred stock units vest on the first anniversary of the June 15, 2026 grant date. They will in any case be fully vested by the date of Mirum’s 2027 annual stockholder meeting.

What are deferred stock units in Mirum Pharmaceuticals (MIRM) Form 4 for Laura Brege?

Deferred stock units are rights to receive Mirum common shares in the future. Brege’s 1,980 units each convert into one share, vest after one year, and are paid in stock upon a change in control or within 60 days after her separation from service.

Did Laura Brege buy or sell any Mirum Pharmaceuticals (MIRM) shares on the market?

No open-market buys or sells were reported. The Form 4 shows only compensation-related grants: 1,980 deferred stock units and 3,772 stock options, both classified as award acquisitions rather than market purchases or sales.