At any point during that year, regardless of how hard you work or how well you perform, the company can terminate you and retain all of the shares you were “awarded”.
4 Hard Truths about Equity
Patrick Brodie
57420

You’re forgetting ‘good leaver’, ‘bad leaver’ agreements here. It’s unlikely they will lose their shares if the employee did nothing wrong. This differs from ‘trial’ periods of about 3 months which often have no share vesting and can be terminated easily on both sides

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