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[Form 4] Mirum Pharmaceuticals, Inc. Insider Trading Activity

Filing Impact
(Neutral)
Filing Sentiment
(Positive)
Form Type
4
Rhea-AI Filing Summary

Insider transactions by a company director: Mirum Pharmaceuticals director Saira Ramasastry exercised a stock option and sold the resulting shares on 09/08/2025. The reporting shows an exercise (code M) of 17,000 shares at a conversion/exercise price of $23.51, followed the same day by a sale (code S) of 17,000 common shares at a weighted average sale price of $77.042178 (range: $76.835�$77.29). The derivative disclosure notes the option is fully vested. The Form 4 was signed by an attorney-in-fact on behalf of the reporting person.

Operazioni interne da parte di un dirigente della società: La dirigente di Mirum Pharmaceuticals, Saira Ramasastry, ha esercitato un'opzione su azioni e ha venduto le azioni risultanti il 09/08/2025. La segnalazione indica un esercizio (codice M) di 17.000 azioni a un prezzo di conversione/esercizio di $23,51, seguito nello stesso giorno da una vendita (codice S) di 17.000 azioni ordinarie a un prezzo medio ponderato di vendita di $77,042178 (range: $76,835�$77,29). La dichiarazione sui derivati segnala che l'opzione è completamente maturata. Il Modulo 4 è stato firmato da un procuratore in nome della persona segnalante.

Operaciones internas por parte de un directivo de la compañía: La directora de Mirum Pharmaceuticals, Saira Ramasastry, ejerció una opción sobre acciones y vendió las acciones resultantes el 09/08/2025. El informe muestra un ejercicio (código M) de 17.000 acciones a un precio de conversión/ejercicio de $23,51, seguido el mismo día por una venta (código S) de 17.000 acciones ordinarias a un precio medio ponderado de venta de $77,042178 (rango: $76,835�$77,29). La divulgación sobre derivados indica que la opción está totalmente consolidada. El Formulario 4 fue firmado por un apoderado en nombre de la persona que informa.

회사 임원� 내부� 거래: Mirum Pharmaceuticals 이사� 사이� 라마사스트리(Saira Ramasastry)� 2025-09-08� 스톡옵션� 행사하고 그에 따른 주식� 매각했습니다. 보고서에� 전환/행사가격이 $23.51� 17,000주를 행사(코드 M)� � 같은 � 가중평� 매도가� $77.042178 (범위: $76.835�$77.29)으로 17,000 보통주를 매도(코드 S)했다� 기재되어 있습니다. 파생상품 공시에는 해당 옵션� 완전� 베스�(vested)되었음이 명시되어 있습니다. Form 4� 보고자를 대리한 대리인� 서명했습니다.

Transactions d'initiés par un dirigeant de la société : La directrice de Mirum Pharmaceuticals, Saira Ramasastry, a exercé une option d'achat d'actions et a vendu les actions obtenues le 09/08/2025. Le rapport indique un exercice (code M) de 17 000 actions à un prix de conversion/exercice de $23,51, suivi le même jour d'une vente (code S) de 17 000 actions ordinaires à un prix de vente moyen pondéré de $77,042178 (intervalle : $76,835�$77,29). La divulgation relative aux dérivés précise que l'option est entièrement acquise (fully vested). Le formulaire 4 a été signé par un mandataire au nom de la personne déclarante.

Insider-Transaktionen durch ein Vorstandsmitglied: Die Direktorin von Mirum Pharmaceuticals, Saira Ramasastry, übte am 09.08.2025 eine Aktienoption aus und verkaufte die daraus resultierenden Aktien. Die Meldung weist eine Ausübung (Code M) von 17.000 Aktien zu einem Ausübungskurs/Umrechnungskurs von $23,51 aus, gefolgt am selben Tag von einem Verkauf (Code S) von 17.000 Stammaktien zu einem gewichteten durchschnittlichen Verkaufspreis von $77,042178 (Spanne: $76,835�$77,29). Die Derivateangabe vermerkt, dass die Option vollständig unverfallbar ist. Das Formular 4 wurde von einem Bevollmächtigten im Namen der meldenden Person unterzeichnet.

Positive
  • None.
Negative
  • None.

Insights

TL;DR: Director exercised a vested option and sold all acquired shares the same day, yielding a material realized gain per share.

The filing documents a standard option exercise (exercise price $23.51) and immediate disposition of 17,000 shares at a weighted average sale price of $77.042178. This represents a clear, reportable insider liquidity event without additional context on intent. The disclosure includes the sale price range and offers provision for providing per-price quantities on request, which supports transparency.

TL;DR: Routine, compliant Section 16 filing showing a director's vested-option exercise and contemporaneous sale; fully vested option disclosed.

The Form 4 identifies the reporting person as a director and confirms the stock option is fully vested. The document is properly signed by an attorney-in-fact and supplies the weighted-average sale price plus the range, meeting common disclosure expectations. No amendment or additional linked arrangements are disclosed in this filing.

Operazioni interne da parte di un dirigente della società: La dirigente di Mirum Pharmaceuticals, Saira Ramasastry, ha esercitato un'opzione su azioni e ha venduto le azioni risultanti il 09/08/2025. La segnalazione indica un esercizio (codice M) di 17.000 azioni a un prezzo di conversione/esercizio di $23,51, seguito nello stesso giorno da una vendita (codice S) di 17.000 azioni ordinarie a un prezzo medio ponderato di vendita di $77,042178 (range: $76,835�$77,29). La dichiarazione sui derivati segnala che l'opzione è completamente maturata. Il Modulo 4 è stato firmato da un procuratore in nome della persona segnalante.

Operaciones internas por parte de un directivo de la compañía: La directora de Mirum Pharmaceuticals, Saira Ramasastry, ejerció una opción sobre acciones y vendió las acciones resultantes el 09/08/2025. El informe muestra un ejercicio (código M) de 17.000 acciones a un precio de conversión/ejercicio de $23,51, seguido el mismo día por una venta (código S) de 17.000 acciones ordinarias a un precio medio ponderado de venta de $77,042178 (rango: $76,835�$77,29). La divulgación sobre derivados indica que la opción está totalmente consolidada. El Formulario 4 fue firmado por un apoderado en nombre de la persona que informa.

회사 임원� 내부� 거래: Mirum Pharmaceuticals 이사� 사이� 라마사스트리(Saira Ramasastry)� 2025-09-08� 스톡옵션� 행사하고 그에 따른 주식� 매각했습니다. 보고서에� 전환/행사가격이 $23.51� 17,000주를 행사(코드 M)� � 같은 � 가중평� 매도가� $77.042178 (범위: $76.835�$77.29)으로 17,000 보통주를 매도(코드 S)했다� 기재되어 있습니다. 파생상품 공시에는 해당 옵션� 완전� 베스�(vested)되었음이 명시되어 있습니다. Form 4� 보고자를 대리한 대리인� 서명했습니다.

Transactions d'initiés par un dirigeant de la société : La directrice de Mirum Pharmaceuticals, Saira Ramasastry, a exercé une option d'achat d'actions et a vendu les actions obtenues le 09/08/2025. Le rapport indique un exercice (code M) de 17 000 actions à un prix de conversion/exercice de $23,51, suivi le même jour d'une vente (code S) de 17 000 actions ordinaires à un prix de vente moyen pondéré de $77,042178 (intervalle : $76,835�$77,29). La divulgation relative aux dérivés précise que l'option est entièrement acquise (fully vested). Le formulaire 4 a été signé par un mandataire au nom de la personne déclarante.

Insider-Transaktionen durch ein Vorstandsmitglied: Die Direktorin von Mirum Pharmaceuticals, Saira Ramasastry, übte am 09.08.2025 eine Aktienoption aus und verkaufte die daraus resultierenden Aktien. Die Meldung weist eine Ausübung (Code M) von 17.000 Aktien zu einem Ausübungskurs/Umrechnungskurs von $23,51 aus, gefolgt am selben Tag von einem Verkauf (Code S) von 17.000 Stammaktien zu einem gewichteten durchschnittlichen Verkaufspreis von $77,042178 (Spanne: $76,835�$77,29). Die Derivateangabe vermerkt, dass die Option vollständig unverfallbar ist. Das Formular 4 wurde von einem Bevollmächtigten im Namen der meldenden Person unterzeichnet.

SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Ramasastry Saira

(Last) (First) (Middle)
C/O MIRUM PHARMACEUTICALS, INC.
989 E HILLSDALE BLVD., SUITE 300

(Street)
FOSTER CITY CA 94404

(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
Mirum Pharmaceuticals, Inc. [ MIRM ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director 10% Owner
Officer (give title below) Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
09/08/2025
4. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 09/08/2025 M 17,000 A $23.51 17,000 D
Common Stock 09/08/2025 S 17,000 D (1) 0 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (right to buy) $23.51 09/08/2025 M 17,000 (2) 06/01/2032 Common Stock 17,000 $0 17,000 D
Explanation of Responses:
1. The weighted average sale price for the transaction reported was $77.042178, and the range of prices were between $76.835 and $77.29. Upon request by the SEC staff, the Issuer, or any security holder of the Issuer, full information regarding the number of shares sold at each separate price will be provided.
2. The stock option is fully vested.
/s/ Judit Ryvkin, Attorney-in-Fact 09/10/2025
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
Mirum Pharmaceuticals

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MIRM Stock Data

3.89B
42.27M
1.86%
114.53%
13.25%
Biotechnology
Pharmaceutical Preparations
United States
FOSTER CITY