This happened to me. My employer got sold, and only about half of my outstanding ISO's were vested at the time. However, I'd been there a pretty long time, and getting more ISO grants as time went on, so I wasn't too bent out of shape about it.
In my opinion, you should think about instruments such as RSU's and options as accruing to you at the date of vest, not the date of grant. From an accounting standpoint, that's how the company is viewing it, or at least should be.
In my opinion, you should think about instruments such as RSU's and options as accruing to you at the date of vest, not the date of grant. From an accounting standpoint, that's how the company is viewing it, or at least should be.