X0508 4 2026-02-17 0001816736 Disc Medicine, Inc. IRON 0001951849 Yu Jonathan Yen-Wen C/O DISC MEDICINE, INC. 321 ARSENAL STREET, SUITE 101 WATERTOWN MA 02472 false true false false Chief Operating Officer false Common Stock 2026-02-17 4 S false 3231 62.86 D 54324 D This transaction represents shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of certain restricted stock units previously reported in Table I. This sale is a "sell to cover" transaction and does not represent a discretionary transaction by the Reporting Person. By: /s/ Rahul Khara, as Attorney-in-Fact 2026-02-17