content: My guess is they are cashing out before a fall in stock prices but you make an excellent point.  Maybe with the Trump talk about regulating them and perhaps for the same reason many CEOs who were guilty but the crimes were less serious, they were allowed to testify before a video camera, cross examined, lawyers present, all legal, and given the option to escape prosecution if they also retired or stepped down.  Now, that has a ring of possible truth to it, doesn't it?  I don't know if it's true but it does make sense with all the other CEO resignations and the specter of regulation coming along.