Explicación en inglés: When employees are given stock options or restricted stock, they often do not gain control over the stock or options for a period of time. This period is known as the vesting period and is usually 3 to 5 years. During the vesting period the employee cannot sell or transfer the stock or options. source: http://management.about.com/cs/adminaccounting/g/vesting.htm

Se trata de tener derecho a la rendencion en la hora de jubilarse.