Mirum Pharmaceuticals (MIRM) Form 144: 40,000 Shares, $2.48M Value

Mirum Pharmaceuticals, Inc. (MIRM) filed a Form 144 reporting the proposed sale of 40,000 common shares acquired by stock option exercise on 08/11/2025.

Rhea-AI Filing Summary

Mirum Pharmaceuticals, Inc. (MIRM) filed a Form 144 reporting the proposed sale of 40,000 common shares acquired by stock option exercise on 08/11/2025. The sale is to be executed through Morgan Stanley Smith Barney LLC with an aggregate market value of $2,480,000 based on the filing and the company has 50,237,647 shares outstanding as shown.

The filing also records a prior sale during the past three months: Christopher Peetz sold 40,000 shares on 08/07/2025 for $2,210,040. The filer certifies they have no undisclosed material adverse information and notes the securities were paid for in cash at acquisition.

Insights

Financial Analyst

TL;DR: Insider notice for 40,000 shares (~0.08% of outstanding) from an option exercise; transaction size appears modest relative to company equity.

The Form 144 documents a proposed sale of 40,000 common shares acquired on 08/11/2025 via a stock option exercise, to be brokered by Morgan Stanley Smith Barney. The filing lists an aggregate market value of $2,480,000 and total shares outstanding of 50,237,647. From a capital-markets perspective, this represents a small percentage of the company's float, limiting likely market impact. The disclosure of a prior 40,000-share sale on 08/07/2025 for $2,210,040 provides recent pricing context. The form’s attestation about no undisclosed material information is standard.

Corporate Governance Expert

TL;DR: Routine insider sale notice; compliance with Rule 144 is documented and the filer affirms no undisclosed material information.

The submission is a standard Rule 144 notice disclosing an insider-related sale following a stock option exercise. It names the executing broker and records a recent related sale by Christopher Peetz. The form includes the required attestation regarding material nonpublic information and notes cash payment at acquisition. From a governance standpoint, the filing satisfies disclosure obligations; no governance irregularities are evident in the document itself.

FAQ

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

What does the Mirum (MIRM) Form 144 report?

The Form 144 reports a proposed sale of 40,000 common shares acquired via a stock option exercise on 08/11/2025, to be sold through Morgan Stanley Smith Barney LLC.

What is the aggregate market value and outstanding share count disclosed?

The filing lists an aggregate market value of $2,480,000 for the shares to be sold and reports 50,237,647 shares outstanding.

Was there any related sale in the past three months for MIRM?

Yes. The filing shows Christopher Peetz sold 40,000 shares on 08/07/2025 for $2,210,040.

How were the acquired shares paid for according to the filing?

The securities acquired on 08/11/2025 were paid for in cash, following a stock option exercise.

Does the filer attest to possession of any undisclosed material information?

Yes. The filer represents by signing the notice that they do not know any material adverse information about the issuer that has not been publicly disclosed.

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

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Accepted by SEC EDGAR 08/11/2025 - 04:06 PM 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	40000	2480000.00	50237647	08/11/2025	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	08/11/2025	Stock Option Exercise	ISSUER			40000	08/11/2025	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	08/07/2025	40000	2210040.00

144: Remarks and Signature

Remarks
Date of Notice	08/11/2025
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/22/2024
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)