Amarin Corp Plc (AMRN)

[ferretmoney]

When I saw the volume in the Jan $5 put my first thought was to look for similar numbers. The $21 strike is the best match. I speculate that a margin call could have been generated on the $21 short puts when the price fell and buying the 5's eliminated part of the risk and relieved the margin call. The $21's were sold for $4.15 so paying $0.11 for the relief is trivial. Certainly these trades were made by some very heavy hitters, and the strategy may be much more complex than I speculated.

The reality is that we can't deduce much if anything by looking at a single option trade.