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SCHEDULE Filed 2026-01-27 Event 2026-01-23 SEC 0001231919-26-000093 →

Frazier Life Sciences IX, L.P. Mirum Pharmaceuticals, Inc. MIRM

Stake: 6.80% Shares: 4,108,404 CUSIP: 604749101 Class: Common Stock, par value $0.0001 per share

Item 4 — Purpose of Transaction

Item 4 is hereby amended and restated in its entirety to read as follows: Each of FLS IX, FLS X, FLSPF, FLS XI and FLS XII acquired the FLS IX Shares, the FLS X Shares, the FLSPF Shares, the FLS XI Shares and the FLS XII Shares, as the case may be, for investment purposes. Depending on market conditions, its continuing evaluation of the business and prospects of the Issuer and other factors, FLS IX, FLS X, FLSPF, FLS XI and FLS XII and the other Reporting Persons may dispose of or acquire additional shares of the Issuer. Except as set forth above, none of the Reporting Persons has any present plans which relate to or would result in: (a) The acquisition by any person of additional securities of the Issuer, or the disposition of securities of the Issuer; (b) An extraordinary corporate transaction, such as a merger, reorganization or liquidation, involving the Issuer or any of its subsidiaries; (c) A sale or transfer of a material amount of assets of the Issuer or any of its subsidiaries; (d) Any change in the present board of directors or management of the Issuer, including any plans or proposals to change the number or term of directors or to fill any existing vacancies on the board; (e) Any material change in the present capitalization or dividend policy of the Issuer; (f) Any other material change in the Issuer's business or corporate structure; (g) Changes in the Issuer's charter, bylaws or instruments corresponding thereto or other actions which may impede the acquisition of control of the Issuer by any person; (h) Causing a class of securities of the Issuer to be delisted from a national securities exchange or to cease to be authorized to be quoted in an inter-dealer quotation system of a registered national securities association; (i) A class of equity securities of the Issuer becoming eligible for termination of registration pursuant to Section 12(g)(4) of the Securities Exchange Act of 1934, as amended; or (j) Any action similar to any of those enumerated above.

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Short Interest · settle 2026-03-31
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