Amarin Corp Plc (AMRN)

[ferretmoney]

I think he was referring to the fact that the option prices changed to a much greater extent than the share price. This is due to change in volatility. When uncertainty Is high the implied volatility skyrockets. The price of a call with a strike price which is above the current share price is all premium (Zero intrinsic value). The premium is mostly volatility premium plus a little bit of time premium. When the uncertainty is removed the volatility will collapse and prices will collapse to intrinsic plus time premium plus a much smaller volatility premium.

During trading hours you can get a close idea of the market value of your options by looking at the bid and ask. As long as there is any size behind them then the ‘mark‘ or current value is the approximate midpoint. To buy an option you have to pay a penny or two or sometimes a nickel more than the midpoint, and to sell an option you can ask a penny or two or sometimes a nickel less than the midpoint.

Outside of trading hours the bid and the ask are not accurate and therefore the mark is not accurate.