Page 5 of 11 – SEC Filing
| ITEM 1. | Security and Issuer |
This Schedule 13D relates to the ordinary
shares (the “Ordinary Shares”), of Strongbridge Biopharma plc (the “Company”). The principal executive office
of the Company is located at 900 Northbrook Drive, Suite 200, Trevose, Pennsylvania 19053.
| ITEM 2. | Identity and Background |
(a)
This statement is being filed by Caxton Corporation, a Delaware Corporation, CDK Associates, L.L.C., a Delaware limited
liability company and Mr. Bruce Kovner (each a “Reporting Person” and collectively the “Reporting
Persons”).
| (b) (i) | The address of Caxton Corporation is 731 Alexander Road, Bldg. 2, Suite 500 Princeton, NJ 08540. |
| (ii) | The address of CDK Associates, L.L.C. is 731 Alexander Road, Bldg. 2, Suite 500 Princeton, NJ 08540. |
| (iii) | The business address of Mr. Kovner is c/o Caxton Corporation, 731 Alexander Road, Bldg. 2, Suite 500 Princeton, NJ 08540. |
| (c) (i) | The principal business of Caxton Corporation is to serve as the manager of certain investment vehicles controlled by Mr. Kovner, including CDK Associates, L.L.C., and as general partner of Caxton Alternative Management LP, an affiliate of Caxton Corporation. |
| (ii) | The principal business of CDK Associates, L.L.C. is to serve as an investment vehicle for investments in securities. |
| (iii) | The present principal occupation of Mr. Kovner is Chairman of Caxton Corporation and Caxton Alternative Management LP. |
(d) No
person filing this statement has during the past five years, been convicted in a criminal proceeding (excluding traffic violations
or similar misdemeanors).
(e) No
person filing this statement has during the last five years been a party to a civil proceeding of a judicial or administrative
body of competent jurisdiction and as a result of such a proceeding was or is subject to a judgment, decree or final order enjoining
future violations of, or prohibiting or mandating activities subject to Federal or state securities laws or finding any violation
with respect to such laws.
| (f) | Citizenship: |
| (i) | Caxton Corporation – Delaware. |
| (ii) | CDK Associates, L.L.C. – Delaware. |
| (iii) | Mr. Kovner – United States. |
| ITEM 3. | Source and Amount of Funds or Other Consideration. |
As of the date hereof Caxton Corporation
may be deemed to beneficially own 7,614,994 Ordinary Shares.
As of the date hereof CDK Associates,
L.L.C. may be deemed to beneficially own 7,202,433 Ordinary Shares.
As of the date hereof Mr. Kovner may be
deemed to beneficially own 7,614,994 Ordinary Shares.
The funds for the purchase of the Ordinary
Shares beneficially owned by the Reporting Persons (other than Ordinary Shares owned by employees of an affiliate of Caxton Corporation)
came from working capital.
