Is this amount vested over 4 years after the acquisition?
I have not been here 4 years, but that's the full amount assuming the current Amazon price. I don't have any strong opinion about where Amazon's price is headed.
A dead sibling comment claims that $0 is $0, which might be a relevant thing to say if I had not vested any shares yet.
Not sure you answered my question. I was asking whether the $500k - $1m was paid as a lump sum on acquisition.
Sorry about that. I did not receive any lump sum. I have the standard options setup and I received a (much smaller) equity grant that vests over 4 years starting at the date of the acquisition.