[ptmcc]

Yes. There is usually a base retention grant every year, which is roughly one quarter of a new hire grant, with a 4 year vest.

Then there are tiers of additional performance grants on top of the retention grant, which can be significant, perhaps as much or more as an entire new hire grant.

In a well-designed RSU grant system, employees basically end up on an RSU vesting treadmill that always has that carrot on a stick in front of them. The golden handcuffs to keep them around.

Specifics vary by company, but that's the template most start from.