Mirum officer plans sale of 658 restricted shares

An officer associated with Mirum Pharmaceuticals, Inc. files a Rule 144 notice to sell 658 restricted shares and discloses over 46,000 shares sold in the prior three months.

Rhea-AI Filing Summary

Mirum Pharmaceuticals, Inc. (MIRM) is the issuer in a Rule 144 notice covering proposed sales of its common stock for the account of officer Jolanda Marie Howe. The planned sale involves 658 shares of common stock through a broker, Morgan Stanley Smith Barney LLC Executive Financial Services, with a stated dollar amount of $65,800.00 as of September 2, 2026.

The shares to be sold are identified as restricted stock acquired from the issuer on January 23, 2026. The notice also lists prior sales by Jolanda Marie Howe over the preceding three months, including 40,000 shares for $4,000,000.00 on August 18, 2026 and several smaller transactions in June, July, and early August 2026.

Key Figures

Shares proposed for sale: 658 shares Stated dollar amount for proposed sale: $65,800.00 Largest recent sale: 40,000 shares for $4,000,000.00 +3 more

6 metrics

Shares proposed for sale 658 shares Common stock under Rule 144 notice for Jolanda Marie Howe

Stated dollar amount for proposed sale $65,800.00 Corresponding to 658 shares with broker Morgan Stanley Smith Barney LLC Executive Financial Services as of September 2, 2026

Largest recent sale 40,000 shares for $4,000,000.00 Sale of Mirum common stock by Jolanda Marie Howe on August 18, 2026

Other recent sale on August 3, 2026 1,840 shares for $193,733.60 Mirum common stock sold by Jolanda Marie Howe

Sale on July 1, 2026 2,721 shares for $326,520.00 Mirum common stock sold by Jolanda Marie Howe

Sale on June 17, 2026 2,594 shares for $264,458.30 Mirum common stock sold by Jolanda Marie Howe

Key Terms

Rule 144, Restricted Stock, issuer

3 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.

Restricted Stock financial

"Common | 01/23/2026 | Restricted Stock | ISSUER"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

issuer regulatory

"Restricted Stock | ISSUER | | | 658 | 01/23/2026"

FAQ

What does the Form 144 filing disclose for Mirum Pharmaceuticals, Inc. (MIRM)?

It discloses a planned sale under Rule 144 of 658 shares of Mirum Pharmaceuticals, Inc. common stock for the account of officer Jolanda Marie Howe, along with details of her recent sales of Mirum common stock during the past three months.

How many Mirum Pharmaceuticals (MIRM) shares are proposed to be sold and through which broker?

The notice covers a proposed sale of 658 shares of Mirum Pharmaceuticals common stock through Morgan Stanley Smith Barney LLC Executive Financial Services, with the trading venue identified as NASDAQ and a stated dollar amount of $65,800.00 on September 2, 2026.

What type of Mirum Pharmaceuticals (MIRM) shares are being sold by Jolanda Marie Howe?

The securities to be sold are Mirum Pharmaceuticals common stock classified as Restricted Stock, acquired from the issuer on January 23, 2026. The filing ties the 658 shares proposed for sale to this restricted stock acquisition.

What Mirum Pharmaceuticals (MIRM) stock sales has Jolanda Marie Howe made in the past three months?

The notice lists four sales of Mirum common stock: 40,000 shares for $4,000,000.00 on August 18, 2026; 1,840 shares for $193,733.60 on August 3, 2026; 2,721 shares for $326,520.00 on July 1, 2026; and 2,594 shares for $264,458.30 on June 17, 2026.

Who is the person selling Mirum Pharmaceuticals (MIRM) shares in this Form 144?

The selling person is Jolanda Marie Howe, identified in the filing as an Officer of Mirum Pharmaceuticals, Inc. The notice provides her name and address and aggregates her sales that are subject to Rule 144 requirements.

What dates are associated with the Mirum Pharmaceuticals (MIRM) restricted stock being sold?

The restricted Mirum Pharmaceuticals common stock to be sold is shown as acquired on January 23, 2026, with 658 shares listed in the securities-to-be-sold section and a related date of January 23, 2026 noted again in that section.

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

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Available on EDGAR 09/02/2026 - 04:07 PM Accepted by SEC EDGAR 09/02/2026 - 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	0001974200
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	JOLANDA MARIE HOWE
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

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	658	65800.00	64932203	09/02/2026	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	01/23/2026	Restricted Stock	ISSUER			658	01/23/2026	Not Applicable

* 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
JOLANDA MARIE HOWE 989 East Hillsdale Boulevard, Suite 300 Foster City CA 94404	Common	08/18/2026	40000	4000000.00
JOLANDA MARIE HOWE 989 East Hillsdale Boulevard, Suite 300 Foster City CA 94404	Common	08/03/2026	1840	193733.60
JOLANDA MARIE HOWE 989 East Hillsdale Boulevard, Suite 300 Foster City CA 94404	Common	07/01/2026	2721	326520.00
JOLANDA MARIE HOWE 989 East Hillsdale Boulevard, Suite 300 Foster City CA 94404	Common	06/17/2026	2594	264458.30

144: Remarks and Signature

Remarks
Date of Notice	09/02/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	03/18/2026
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/ Jolanda Howe
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)