Fwiw, I asked around and couldn't find a hire where this was the case. The schedules are different but the conversion to shares happens once just after your are hired.
This is a bit of a change from e.x. when I was hired and my offer letter said N shares, and so when I joined 6 months later my grant had increased in value significantly. But it's still not the situation in these other companies, where you vest 6.25% of the dollar value each quarter, converted to shares or whatever.
Actually that wouldn't really be compatible with googles vesting schedule, now that I think about it.
