Vesting an option gives you the option, but not the requirement, to purchase the shares. Typically, you retain that option for as long as you are employed. So y

Vesting an option gives you the option, but not the requirement, to purchase the shares. Typically, you retain that option for as long as you are employed. So you shouldn't have to do anything as long as you are employed - you may have to make this decision if/when you part ways with the company. The employer has very little to gain from you purchasing the options. If your employer puts any pressure on you to purchase the options, you can 1) remind them why they are called options - it's your option to purchase them, and 2) look for a better employer. Of course, IANAL, and perhaps your situation is not typical.