Mirum Pharma officer plans $978K stock sale

Officer Eric Bjerkholt filed a Rule 144 notice to sell Mirum Pharmaceuticals shares mainly to cover taxes on recently vested stock units.

Available on EDGAR 09/15/2026 - 04:19 PM EDT Accepted by SEC EDGAR 09/15/2026 - 04:18 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Mirum Pharmaceuticals, Inc. (MIRM) has a planned sale of up to 9,943 shares of common stock under Rule 144 for the account of officer Eric Bjerkholt, through Morgan Stanley Smith Barney LLC. The notice describes the sale as a sell-to-cover transaction for taxes on recently vested stock unit awards.

The filing also reports prior sales by Bjerkholt in the last three months totaling 11,001 shares of Mirum common stock.

Key Figures

Planned shares to be sold: 9,943 shares Aggregate market value of planned sale: $978,092.91 Shares outstanding: 64,932,203 shares +4 more

7 metrics

Planned shares to be sold 9,943 shares Common stock covered by the new Rule 144 notice for Eric Bjerkholt

Aggregate market value of planned sale $978,092.91 Value associated with the 9,943 shares listed in the securities information section

Shares outstanding 64,932,203 shares Mirum Pharmaceuticals common stock referenced in the securities information section

Shares sold August 11, 2026 6,001 shares Common stock sold by Eric Bjerkholt with aggregate value $599,509.68

Aggregate value August 11, 2026 sale $599,509.68 Value of 6,001 shares of Mirum common stock sold

Shares sold July 6, 2026 5,000 shares Common stock sold by Eric Bjerkholt with aggregate value $611,270.00

Aggregate value July 6, 2026 sale $611,270.00 Value of 5,000 shares of Mirum common stock sold

Key Terms

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

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 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.

sell-to-cover transaction financial

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

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.

FAQ

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

What does Mirum Pharmaceuticals (MIRM) disclose in this Form 144 filing?

The notice states that officer Eric Bjerkholt plans to sell up to 9,943 shares of Mirum Pharmaceuticals common stock under Rule 144, primarily as a sell-to-cover transaction for taxes related to recently vested stock unit awards granted by the company.

How many Mirum (MIRM) shares are covered by the new Rule 144 sale?

The filing covers up to 9,943 shares of Mirum Pharmaceuticals common stock. These shares are associated with Restricted Stock Units vesting under a registered plan and are intended to be sold mainly to cover related tax obligations.

What Mirum (MIRM) insider sales occurred in the past three months?

The filing reports that Eric Bjerkholt sold 6,001 shares of Mirum common stock on August 11, 2026 for an aggregate value of $599,509.68, and 5,000 shares on July 6, 2026 for an aggregate value of $611,270.00.

Who is the broker for the Mirum (MIRM) Rule 144 sale?

The planned sale of Mirum Pharmaceuticals common stock is to be executed through Morgan Stanley Smith Barney LLC, located at 1 New York Plaza in New York. This broker is listed as handling the 9,943-share Rule 144 transaction.

What is the stated purpose of Eric Bjerkholt’s Mirum (MIRM) share sale?

The remarks describe the transaction as a sell-to-cover for taxes owed related to the recent vesting of stock unit awards granted by Mirum Pharmaceuticals, indicating the sale is linked to equity compensation rather than a standalone cash-raising decision.

How many Mirum (MIRM) shares were outstanding as referenced in the filing?

The Form 144 references 64,932,203 shares of Mirum Pharmaceuticals common stock outstanding in the section listing securities information. This figure provides context for the relative size of the planned 9,943-share sale.

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	0001197350
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	ERIC BJERKHOLT
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 Stock	Morgan Stanley Smith Barney LLC 1 New York Plaza, 8th Floor New York NY 10004	9943	978092.91	64932203	09/14/2026	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	09/11/2026	Restricted Stock Units vesting under registered plan	Issuer			9943	09/11/2026	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Eric Bjerkholt c/o Mirum Pharmaceuticals, Inc. 989 E Hillsdale Blvd., Suite 300 Foster City CA 94404	Common Stock	08/11/2026	6001	599509.68
Eric Bjerkholt c/o Mirum Pharmaceuticals, Inc. 989 E Hillsdale Blvd., Suite 300 Foster City CA 94404	Common Stock	07/06/2026	5000	611270.00

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	09/15/2026
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)