>1. FMV per share — In general I recommend using the most recent investor price. If it’s been a long time since your last financing round then I recommend adjusting that FMV per share by a reasonable growth rate (either tied to revenue growth or the change in your 409a value).
>2. 409a value — This will most likely be the exercise price for the option grant. Since a 409a value is calculated at least once a year (and definitely along with a round of financing), it should be relevant for the calculation.
But if the 409a value is recalculated along with a round of financing, wouldn't FMV per share equal 409 value?