stock option
US /ˈstɑːk ˌɑːp.ʃən/
UK /ˈstɑːk ˌɑːp.ʃən/

1.
the right to buy or sell a stock at a specified price within a specified period of time
:
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Many tech companies offer stock options to their employees as part of their compensation package.
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Exercising a stock option allows an employee to purchase company shares at a predetermined price.