SUPERNUS PHARMACEUTICALS INC

This Proxy Statement is furnished with the attached Notice of Annual Meeting on or about April 29, 2024, to each stockholder of record of Supernus Pharmaceuticals, Inc. (Supernus or the Company) as of the close of business on April 18, 2024 (Record Date), in connection with the solicitation of proxies by the Board of Directors to be voted at the Annual Meeting of Stockholders (Annual Meeting) of the Company to be held virtually via a webcast on June 14, 2024, at 10:00 A.M. Eastern Daylight Time, and at any adjournment or adjournments thereof for the purposes stated below.

Only stockholders of record as of the close of business on the Record Date will be entitled to vote on all matters presented for vote at the Annual Meeting. At the close of business on April 18, 2024, the total number of shares of our common stock (Common Stock) outstanding was 54,973,754 shares. Each share of Common Stock will be entitled to one vote per share on all business to come before the Annual Meeting.