(8)

Equity

Common stock

On July 12, 2013, the Company completed a public offering of 21,700,000 ADSs. The underwriters purchased the ADSs from Amarin at a price of $5.60 per ADS, resulting in net proceeds to Amarin of approximately $121.2 million, after deducting estimated offering expenses payable by the Company. Amarin also granted the underwriters a 30-day option to purchase an additional 3,255,000 ADSs, which was not exercised. The stated use of proceeds in connection with this offering were as follows: primarily to continue the commercial launch of Vascepa capsules in the MARINE indication, prepare for and commercially launch Vascepa in the ANCHOR indication, if approved, advance the Company’s REDUCE-IT cardiovascular outcomes trial, and for general corporate and working capital purposes.

During the nine months ended September 30, 2013 and 2012, the Company issued 386,000 and 3,107,913 shares, respectively, as a result of the exercise of stock options. Gross and net proceeds resulting from the exercise of stock options amounted to $0.6 million for the nine months ended September 30, 2013. For the nine months ended September 30, 2012, gross proceeds amounted to $7.9 million and net proceeds amounted to $7.8 million resulting from the exercise of stock options. In addition, during the nine months ended September 30, 2013 and 2012, the Company issued 120,000 and 10,881,276 shares, respectively, as a result of the exercise of warrants. Gross and net proceeds resulting from the exercise of warrants amounted to $0.1 million for the nine months ended September 30, 2013. For the nine months ended September 30, 2012, gross proceeds amounted to $16.6 million and net proceeds amounted to $16.5 million resulting from the exercise of warrants.

In August and September of 2013, the Company granted a total of 44,000 restricted stock units (“RSUs”) to several employees under the Amarin Corporation plc 2011 Stock Incentive Plan (“2011 Plan”). As of September 30, 2013, no RSU’s were forfeited and no shares were issued as a result of vesting. These RSUs vest upon the achievement of certain operational milestones and expire on December 31, 2013 if none of the milestones are achieved by such date. The RSUs will become fully vested upon a change of control of the Company. Upon vesting of each RSU, the participant shall be entitled to a payment equal to the fair market value of one share of Amarin common stock. The payment shall be paid to the participant in cash, or at the sole discretion of the Compensation Committee in shares or a combination of cash or shares. The fair value of the RSUs was determined on the date of grant, and compensation expense related to the RSUs is recognized once the related milestone is deemed probable. The Company recorded no expense during the nine months ended September 30, 2013 related to the vesting of these RSUs.

In July of 2013, the Company granted a total of 54,000 deferred stock units (“DSUs”) to members of the Company’s Board of Directors under the Amarin Corporation plc 2011 Stock Incentive Plan (“2011 Plan”). As of September 30, 2013, no DSU’s were forfeited and no shares were issued as a result of vesting. The DSU’s vest over a three year period. The DSUs will become fully vested upon a change of control of the Company. Upon termination of service to the Company, each Director shall be entitled to a payment equal to the fair market value of one share of Amarin common stock, which is required to be made in shares. The Company recorded expense during the nine months ended September 30, 2013 of $47,000 related to the vesting of these DSUs.

In January 2013, the Company granted 454,875 RSUs to several employees under the 2011 Plan. As of September 30, 2013, 32,500 RSUs were forfeited and no shares were issued as a result of vesting. These RSUs vest upon the achievement of certain operational milestones and expire on August 3, 2015 if none of the milestones are achieved by such date. The RSUs will become fully vested upon a change of control of the Company. Upon vesting of each RSU, the participant shall be entitled to a payment equal to the fair market value of one share of Amarin common stock. The payment shall be paid to the participant in cash, or at the sole discretion of the Compensation Committee in shares or a combination of cash or shares. The fair value of the RSUs was determined on the date of grant, and compensation expense related to the RSUs is recognized once the related milestone is deemed probable. The Company recorded no expense during the nine months ended September 30, 2013 related to the vesting of these RSUs.

In February 2012, the Company granted 584,400 RSUs to several employees under the 2011 Plan. As of September 30, 2013, a total of 90,684 RSUs were forfeited. These RSUs vest upon the achievement of certain regulatory and time-based milestones. The RSUs will become fully vested upon a change of control of the Company. Upon vesting of each RSU, the participant shall be entitled to a payment equal to the fair market value of one share of Amarin common stock. The payment shall be paid to the participant in cash, or at the sole discretion of the Compensation Committee in shares or a combination of cash or shares. During the nine months ended September 30, 2013 and 2012, the Company issued 93,048 and 97,398 shares, respectively, as a result of the vesting of these RSUs. The fair value of the RSUs was determined on the date of grant, and compensation expense related to the RSUs is recognized once the related milestone is deemed probable. During the nine months ended September 30, 2013 and 2012, the Company recorded expense of $0.3 million and $1.2 million, respectively, related to the vesting of these RSUs.