MIRM files Form 144 for 2,000-share sale

MIRM submitted Form 144 notices reporting sales of Common Stock.

Rhea-AI Filing Summary

MIRM submitted Form 144 notices reporting sales of Common Stock. The filing lists a 2,000-share sale tied to a stock option exercise dated 05/15/2026. It also records two sales in the prior three months: 2,000 shares on 04/15/2026 for $193,800 and 2,000 shares on 03/16/2026 for $181,520.

Insights

Insider Transactions Analyst

Form 144 lists recent sales tied to an option exercise and two prior dispositions.

The excerpt shows a 2,000-share sale dated 05/15/2026 described as a Stock Option Exercise. Two additional dispositions are recorded: 2,000 shares on 04/15/2026 for $193,800 and 2,000 shares on 03/16/2026 for $181,520.

Cash‑flow treatment and beneficiary details are not provided in the excerpt; subsequent filings or broker confirmations would state how proceeds were received. Timing and motives are not disclosed in the provided content.

Key Figures

Sale on 05/15/2026: 2,000 shares Sale on 04/15/2026: 2,000 shares for $193,800 Sale on 03/16/2026: 2,000 shares for $181,520 +1 more

4 metrics

Sale on 05/15/2026 2,000 shares Stock Option Exercise dated <date>05/15/2026</date>

Sale on 04/15/2026 2,000 shares for $193,800 Disposition dated <date>04/15/2026</date>

Sale on 03/16/2026 2,000 shares for $181,520 Disposition dated <date>03/16/2026</date>

Reference price/amount near 05/15/2026 $218,940.00 Figure shown in securities information line near <date>05/15/2026</date>

Key Terms

Rule 144 / Form 144, Stock Option Exercise, Issuer

3 terms

Rule 144 / Form 144 regulatory

"Lines labeled "144: Securities To Be Sold" and "144: Securities Sold During The Past 3 Months""

Stock Option Exercise financial

"Entry: "05/15/2026 | 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.

Issuer regulatory

"Entry shows disposition method as "ISSUER" on 05/15/2026 line"

FAQ

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

What does MIRM's Form 144 filing report?

It reports sales of Common Stock totaling 2,000 shares on 05/15/2026. The filing also notes two prior three‑month dispositions: 2,000 shares on 04/15/2026 for $193,800 and 2,000 shares on 03/16/2026 for $181,520.

Was the 05/15/2026 sale part of an option exercise for MIRM?

Yes — the 05/15/2026 entry is labeled as a Stock Option Exercise. The excerpt describes the security disposition method as "Stock Option Exercise" and lists the principal party as the issuer on that line.

How many shares were sold by the reporting person in the past three months?

The excerpt lists two past dispositions of 2,000 shares each. Those are dated 04/15/2026 (proceeds $193,800) and 03/16/2026 (proceeds $181,520), as shown in the filing extract.

Does the filing state who received the sale proceeds?

The provided excerpt does not state who received proceeds. The lines show sale amounts and dates but do not disclose the recipient or the allocation of cash proceeds in the visible content.

What trading venue is referenced in the filing for these shares?

The excerpt includes a reference to NASDAQ on 05/15/2026. That date and exchange appear in the securities information line accompanying the 05/15/2026 entry.

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

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Accepted by SEC EDGAR 05/15/2026 - 04:07 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	0001547959
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	SAIRA RAMASASTRY
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	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	2000	218940.00	60981227	05/15/2026	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	05/15/2026	Stock Option Exercise	ISSUER			2000	05/15/2026	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
SAIRA RAMASASTRY 989 East Hillsdale Boulevard, Suite 300 Foster City CA 94404	Common	04/15/2026	2000	193800.00
SAIRA RAMASASTRY 989 East Hillsdale Boulevard, Suite 300 Foster City CA 94404	Common	03/16/2026	2000	181520.00

144: Remarks and Signature

Remarks
Date of Notice	05/15/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/18/2025
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/ Saira Ramasastry
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)