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What means pro rata basis and cliff period for vested shares?

I have a contract in front of me saying:

All shares shall vest on a pro rata basis monthly over a 2year period with a 3-month cliff period. 100 % of unvested shares shall vest on closing of sale of the Company.

I understand the 2nd part - all shares are automatically fully vested in case company is sold.

I don’t understand the first part, what does “pro rata basis” mean, and what does “cliff” mean?

Answer 8368

In short:


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