Mirum Pharmaceuticals: Quan plans $1.42M share sale

The notice describes the sale as covering taxes tied to stock unit awards that vested November 2, 2026.

Available on EDGAR 11/04/2026 - 08:42 PM EST Accepted by SEC EDGAR 11/04/2026 - 08:41 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Mirum Pharmaceuticals, Inc. (MIRM) is identified as the issuer in a notice for former officer Joanne Quan’s planned sale of 14,684 common shares, listed at an aggregate market value of $1,423,907.48 and an approximate sale date of November 4, 2026. Morgan Stanley Smith Barney LLC is listed as broker. The notice describes the sale as a sell-to-cover transaction for taxes owed on recently vested stock unit awards; 14,684 restricted stock units vested November 2, 2026, as compensation for services to the issuer. Judit Ryvkin signed as attorney-in-fact.

Key Figures

Shares to be sold: 14,684 shares Aggregate market value: $1,423,907.48 Shares outstanding: 65,282,044 shares +1 more

4 metrics

Shares to be sold 14,684 shares Common Stock; approximate sale date November 4, 2026

Aggregate market value $1,423,907.48 Shares to be sold

Shares outstanding 65,282,044 shares Issuer securities information

Restricted stock units vesting 14,684 units November 2, 2026; compensation for services to the issuer

Key Terms

sell-to-cover transaction, Restricted Stock Units, Rule 144

3 terms

sell-to-cover transaction financial

"This is a sell-to-cover transaction for taxes owed"

A sell-to-cover transaction is when a person granted company stock (for example as part of compensation or option exercise) immediately sells enough of those shares to pay required taxes or exercise costs and keeps the rest. Think of it like cashing part of a bonus to cover the tax bill; it provides necessary cash without the holder needing outside funds. Investors watch these sales because they increase trading volume and slightly reduce insider holdings, but they often reflect routine tax or cost management rather than a judgment on the company’s prospects.

Restricted Stock Units financial

"Restricted Stock Units vesting under registered plan"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Rule 144 regulatory

"sales required by paragraph (e) 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.

FAQ

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

How many MIRM shares does Joanne Quan plan to sell?

Joanne Quan’s notice lists a planned sale of 14,684 common shares, with an aggregate market value of $1,423,907.48. The approximate sale date is November 4, 2026.

Why is Joanne Quan selling MIRM shares?

The notice describes the planned sale as a sell-to-cover transaction for taxes owed related to recently vested stock unit awards. It lists 14,684 restricted stock units vesting November 2, 2026, as compensation for services to the issuer.

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

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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	0001670138
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 E HILLSDALE BLVD., SUITE 300 FOSTER CITY CALIFORNIA 94404
Phone	650-667-4085
Name of Person for Whose Account the Securities are To Be Sold	Joanne Quan
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	Former 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 Stock	Morgan Stanley Smith Barney LLC 1 New York Plaza, 8th Floor New York NY 10004	14684	1423907.48	65282044	11/04/2026	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 Stock	11/02/2026	Restricted Stock Units vesting under registered plan	Issuer			14684	11/02/2026	Compensation for services rendered to Issuer

* 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

Nothing to Report

144: Remarks and Signature

Remarks	This is a sell-to-cover transaction for taxes owed related to recent vesting of stock unit awards granted by the Issuer.
Date of Notice	11/04/2026
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/ Judit Ryvkin, Attorney-in-Fact
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)