13D Filing: Caxton Corp and Strongbridge Biopharma PLC (SBBP)

The Warrants held by the Reporting Persons
are exercisable at any time, and from time to time, until June 28, 2022 at an exercise price of $2.50 per share. The applicable
per share purchase price and the number of Ordinary Shares issuable upon exercise of the Warrants are subject to adjustment for
the occurrence of certain events, including stock dividends, splits, subdivisions, combinations, reorganizations and reclassifications.
The foregoing description of the Warrants is qualified in its entirety by reference to the form of Warrant, which is filed as an
exhibit to this Schedule 13D and is incorporated by reference herein.

CDK Associates, L.L.C. has entered into
a registration rights agreement with the Company, as described in the Reporting Persons Schedule 13D filed on December 30, 2017.

Exhibit A: Joint Filing
Agreement.

Exhibit B: Power of Attorney
of Bruce Kovner

Exhibit C: Form of Warrant
to purchase Ordinary Shares (incorporated by reference to Exhibit 10.3 to the Issuer’s Form 6-K filed on December 23, 2016).