JOINT FILING AGREEMENT
Exhibit 1
The undersigned hereby agree that the Statement on Schedule 13D, dated June 29, 2010, with
respect to the shares of Amarin Corporation PLC Ordinary Shares, 50 xxxxx par value, is, and any
amendments thereto executed by each of us shall be, filed on behalf of each of us pursuant to and
in accordance with the provisions of Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as
amended, and that this Agreement shall be included as an Exhibit to the Schedule 13D and each such
amendment. Each of the undersigned agrees to be responsible for the timely filing of the Schedule
13D and any amendments thereto, and for the completeness and accuracy of the information concerning
itself contained therein. This Agreement may be executed in any number of counterparts, all of
which taken together shall constitute one and the same instrument.
IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the 29th day of June,
2010.
| BOXER CAPITAL, LLC |
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| By: | /s/ Xxxxx Xxxxx | |||
| Name: | Xxxxx Xxxxx | |||
| Title: | Authorized Signatory | |||
| BOXER ASSET MANAGEMENT INC. |
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| By: | /s/ Xxxxxxxxx X. Xxxx | |||
| Name: | Xxxxxxxxx X. Xxxx | |||
| Title: | Director | |||
| XXXXXX XXXXX |
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| By: | /s/ Xxxxxx Xxxxx | |||
| Xxxxxx Xxxxx, Individually | ||||
