We are going through our first annual audit. We have granted employee stock options. The first tranche was granted at a $100 strike (at the time it was at-the-money). That was on Dec 31, 2013. We valued them then (10 year expiration, 80% vol, ~2% rate, $100 strike and share price) for around $90/option with a a 4 year vesting schedule. The shares are now valued at around $600. As I understand it, we do not revalue the options and simply continue to expense them over the 4 year vest period (so we continue to use the $90 valuation, rather than repricing with the much higher stock price). Is this correct? Thanks so much for your expertise.