X0508 4 2026-02-13 1 0001012477 AVADEL PHARMACEUTICALS PLC AVDL 0001357550 Weiss Asset Management LP 222 BERKELEY STREET, 16TH FLOOR BOSTON MA 02116 0 0 0 1 Former 10% Owner 0001357643 WEISS ANDREW M 222 BERKELEY STREET, 16TH FLOOR BOSTON MA 02116 0 0 0 1 Former 10% Owner 0 Ordinary Shares 2026-02-13 4 S 0 11112052 21 D 0 I See Footnote 2 Represents the cash portion of the consideration paid to shareholders upon the closing of the acquisition of the Issuer by Alkermes plc. In connection with such transaction, each outstanding share was automatically converted into the right to receive $21.00 per share in cash, plus a contingent value right to receive a payment of $1.50 in cash if a specified milestone is achieved. Shares reported herein represent shares beneficially owned by two private investment funds for which Weiss Asset Management LP serves as investment manager. WAM GP LLC is the general partner of Weiss Asset Management LP and Andrew Weiss is the Manager of WAM GP LLC. All of Weiss Asset Management LP, WAM GP LLC, and Andrew Weiss disclaim beneficial ownership of the shares reported herein except to the extent of their pecuniary interest therein. Mary Merrigan, Authorized Signatory, Weiss Asset Management LP and WAM GP LLC 2026-02-18 Mary Merrigan, duly authorized under a power of attorney by Andrew M. Weiss 2026-02-18