I'm thinking it's a minuscule leak as in like a plane ticket has been booked somewhere fancy or normal for a DMC meeting or something where it pops on a company event planner not made to public. But someone has seen this and taken it to be good news
Leak is a bit strong. Yesterday's volume appeared to be the beginning of a potential run-up. We shall see over the next couple of weeks. The price action should continue to rise with volume. If it does that might say "There are people in the know" rather than a leak! If it continues could be a good sign for things to come.
Obviously the IBB rise has provided a lots of wind beneath biotech wings, but the huge volume with AMRN would suggest something more. Rise into 80% perhaps. I don't like the tried and true "leak" theory myself. I suppose the TA people may be jumping in as well.