Mirum holder plans sale of up to 30,000 shares

Rhea-AI Filing Summary

Mirum Pharmaceuticals, Inc. (MIRM) received a Rule 144 notice from stockholder Christopher Peetz covering a planned sale of up to 30,000 shares of common stock, to be sold through Morgan Stanley Smith Barney LLC on or after 09/01/2026, following a stock option exercise. The notice also lists sales during the prior three months totaling 40,000 shares of Mirum common stock.

Key Figures

Planned shares to be sold: 30,000 shares of common stock Sale on 08/10/2026: 20,000 shares; 1,978,346.00 Sale on 07/06/2026: 20,000 shares; 2,445,434.00 +1 more

4 metrics

Planned shares to be sold 30,000 shares of common stock Securities To Be Sold on or after 09/01/2026

Sale on 08/10/2026 20,000 shares; 1,978,346.00 Securities Sold During The Past 3 Months

Sale on 07/06/2026 20,000 shares; 2,445,434.00 Securities Sold During The Past 3 Months

Issuer phone number (650) 667-4085 Contact number for Mirum Pharmaceuticals, Inc.

Key Terms

Rule 144, Securities To Be Sold, Stock Option Exercise, Securities Sold During The Past 3 Months

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Securities To Be Sold financial

"144: Securities To Be Sold Common | 09/01/2026 | Stock Option"

Stock Option Exercise financial

"Common | 09/01/2026 | Stock Option Exercise | ISSUER"

A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.

Securities Sold During The Past 3 Months financial

"144: Securities Sold During The Past 3 Months CHRISTOPHER"

FAQ

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

What does the Form 144 filed for MIRM disclose about upcoming stock sales?

The Form 144 discloses that Christopher Peetz plans to sell up to 30,000 shares of Mirum Pharmaceuticals common stock, to be effected through Morgan Stanley Smith Barney LLC on or after 09/01/2026, in connection with a stock option exercise.

How many MIRM shares has Christopher Peetz sold in the last three months?

The filing lists two sales in the past three months: 20,000 shares of Mirum common stock on 07/06/2026 and another 20,000 shares on 08/10/2026, for aggregate consideration of 1,978,346.00 and 2,445,434.00, respectively.

Who is the selling security holder identified in the MIRM Form 144?

The selling security holder identified is Christopher Peetz, for whose account the Mirum Pharmaceuticals common stock is to be sold under Rule 144. His address is given as 989 East Hillsdale Boulevard, Suite 300, Foster City, California 94404.

What type of MIRM security is covered by this Form 144 notice?

The notice covers sales of Mirum Pharmaceuticals common stock. The planned sale of 30,000 shares is associated with a stock option exercise and is to be executed for cash through Morgan Stanley Smith Barney LLC.

On which market is Mirum Pharmaceuticals (MIRM) stock listed according to the filing?

The securities referenced in the Form 144 are listed as trading on NASDAQ, as indicated in the securities information section associated with Mirum Pharmaceuticals common stock.

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

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Available on EDGAR 09/01/2026 - 04:13 PM EDT Accepted by SEC EDGAR 09/01/2026 - 04:12 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001614740
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	MIRUM PHARMACEUTICALS, INC.
SEC File Number	001-38981
Address of Issuer	989 East Hillsdale Boulevard, Suite 300 Foster City CALIFORNIA 94404
Phone	(650) 667-4085
Name of Person for Whose Account the Securities are To Be Sold	CHRISTOPHER PEETZ
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	30000	2960319.00	64932203	09/01/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	09/01/2026	Stock Option Exercise	ISSUER			30000	09/01/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
CHRISTOPHER PEETZ 989 East Hillsdale Boulevard, Suite 300 Foster City CA 94404	Common	08/10/2026	20000	1978346.00
CHRISTOPHER PEETZ 989 East Hillsdale Boulevard, Suite 300 Foster City CA 94404	Common	07/06/2026	20000	2445434.00

144: Remarks and Signature

Remarks
Date of Notice	09/01/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	03/02/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Christopher James Peetz
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)