L.P. Frazier Life Sciences IX - 23 Jan 2026 SCHEDULE 13D/A Report for MIRUM PHARMACEUTICALS, INC. Common Stock, par value $0.0001 per share (MIRM)

Filing Manager
L.P. Frazier Life Sciences IX
Reporting Manager
Patrick J. Heron
Security
MIRUM PHARMACEUTICALS, INC. Common Stock, par value $0.0001 per share
Symbol
MIRM
Shares outstanding
60,417,706 shares
Disclosed Ownership
4,108,404 shares
Ownership
6.8%
Form type
SCHEDULE 13D/A
Filing time
27 Jan 2026, 16:12:31 UTC
Date of event
23 Jan 2026
Previous filing
04 Nov 2025
SEC
View on sec.gov

Reporting Managers (17)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Frazier Life Sciences IX, L.P. 5.9% 3,566,912 0 3,566,912 /s/ Jennifer Martin By Jennifer Martin, CFO of FHMLS IX, L.L.C., GP of FHMLS IX, L.P., GP of Frazier Life Sciences IX, L.P. 0001720320
FHMLS IX, L.P. 5.9% 3,566,912 0 3,566,912 /s/ Jennifer Martin By Jennifer Martin, CFO of FHMLS IX, L.L.C., GP of FHMLS IX, L.P. 0001782789
FHMLS IX, L.L.C. 5.9% 3,566,912 0 3,566,912 /s/ Jennifer Martin By Jennifer Martin, CFO of FHMLS IX, L.L.C. 0001782791
Frazier Life Sciences X, L.P. 0.8% 459,010 0 459,010 /s/ Jennifer Martin By Jennifer Martin, CFO of FHMLS X, L.L.C., GP of FHMLS X, L.P., GP of Frazier Life Sciences X, L.P. 0001790879
FHMLS X, L.P. 0.8% 459,010 0 459,010 /s/ Jennifer Martin By Jennifer Martin, CFO of FHMLS X, L.L.C., GP of FHMLS X, L.P. 0001790880
FHMLS X, L.L.C. 0.8% 459,010 0 459,010 /s/ Jennifer Martin By Jennifer Martin, CFO of FHMLS X, L.L.C. 0001790811
Frazier Life Sciences Public Fund, L.P. 4.2% 2,514,947 0 2,514,947 /s/ Jennifer Martin By Jennifer Martin, CFO of FHMLSP, L.L.C., GP of FHMLSP, L.P., GP of Frazier Life Sciences Public Fund, L.P. 0001863769
FHMLSP, L.P. 4.2% 2,514,947 0 2,514,947 /s/ Jennifer Martin By Jennifer Martin, CFO of FHMLSP, L.L.C., GP of FHMLSP, L.P. 0001879466
FHMLSP, L.L.C. 4.2% 2,514,947 0 2,514,947 /s/ Jennifer Martin By Jennifer Martin, CFO of FHMLSP, L.L.C. 0001879465
Frazier Life Sciences XI, L.P. 1.8% 1,075,884 0 1,075,884 /s/ Jennifer Martin By Jennifer Martin, CFO of FHMLS XI, L.L.C., GP of FHMLS XI, L.P., GP of Frazier Life Sciences XI, L.P. 0001911592
FHMLS XI, L.P. 1.8% 1,075,884 0 1,075,884 /s/ Jennifer Martin By Jennifer Martin, CFO of FHMLS XI, L.L.C., GP of FHMLS XI, L.P. 0001911580
FHMLS XI, L.L.C. 1.8% 1,075,884 0 1,075,884 /s/ Jennifer Martin By Jennifer Martin, CFO of FHMLS XI, L.L.C. 0001911623
Frazier Life Sciences XII, L.P. 0.1% 62,931 0 62,931 /s/ Jennifer Martin By Jennifer Martin, CFO of FHMLS XII, L.L.C., GP of FHMLS XII, L.P., GP of Frazier Life Sciences XII, L.P. 0002052255
FHMLS XII, L.P. 0.1% 62,931 0 62,931 /s/ Jennifer Martin By Jennifer Martin, CFO of FHMLS XII, L.L.C., GP of FHMLS XII, L.P. 0002052246
FHMLS XII, L.L.C. 0.1% 62,931 0 62,931 /s/ Jennifer Martin By Jennifer Martin, CFO of FHMLS XII, L.L.C. 0002052177
James N. Topper 6.7% 4,025,922 0 4,025,922 /s/ Jennifer Martin By Jennifer Martin, Attorney-in-Fact for Patrick J. Heron, pursuant to Power of Attorney 0001341382
Patrick J. Heron 6.8% 4,108,404 82,482 4,025,922 /s/ Jennifer Martin By Jennifer Martin, Attorney-in-Fact for Patrick J. Heron, pursuant to Power of Attorney 0001365617