Bismarck Lepe left almost immediately after his options fully vested on their four-year anniversary.

FORBES: Close to the Vest

The employee is then fully vested in all of the options in the sixth year from grant.

FORBES: Introduction To Incentive Stock Options

Moreover, that 3% doesn't have to be fully vested until an employee has been with the company two years.

FORBES: Must You Work Until You Drop?

Two big batches of stock options granted before the company went public in August 2004 have fully vested in the last 12 months.

FORBES: Close to the Vest

Even under Enron's option plan, in which options fully vested in three years, an unusually quick rate, Skilling wound up holding many Enron shares he couldn't legally sell.

FORBES: Did Enron Execs 'Dump' Shares?

The standard three-year cliff schedule is used in some cases, where the employee becomes fully vested in all of the options issued to him or her at that time.

FORBES: Introduction To Incentive Stock Options

TixToGo offered employees their deferred salaries in the form of fully-vested stock or cash (their choice), contingent on the company's ability to land financing.

FORBES: Hire now, pay later