I'm studying for an organisational subject and I was reading the following paragraph:
Jeffrey Skilling resigns after just six months; Ken Lay returns to day-to-day management of the company. Enron employee Sherron Watkins sends letter to Ken Lay warning of accounting irregularities that could pose a threat to the company. Ken Lay makes a presentation to employees Around the same time, he also cashes in many of his Enron share options.*
What does "cashing in many of his Enron share options" mean? Is it a bad PR stunt?