According to Options-Monster they were sells and not buys so more likely covered calls, someone buying in with an upside target of 11 and getting a little bonus if it meets their target. it's possible a Short play as they mention but logically makes little sense as upside is onlt the 20 cents and you risk quite a bit.
Here is from OptionsMonster
Shares of Amarin bounced off a 52-week low this morning, but one trader is selling the upside.
The June 11 calls dominate the options trade. Our data systems show that a trader sold 5,000 of those calls for $0.18. The volume is twice the open interest, so this is a new position. The call selling is well out of the money, so it could be done naked with an initial bearish bias.
The naked short call has a negative delta, but can make a profit with shares anywhere below $11 at expiration. (See our Education Section.) It is also possible that the calls were sold against long shares as a covered call. That would be bullish up to the strike, but not beyond.