Cuban insists he has done nothing wrong, and I would be interested in learning about the particulars before coming to a conclusion.
In the first place he is accused of selling stock on the basis of insider information. In this case the information being that the company required additional financing and was going to issue more shares. Let's consider that for just a sec. When you buy shares in a company you are an owner of that firm, the percentage you own is the number of shares you have divided by all the common shares of stock. If the firm decides to create more shares out of nothing and sell them to the public, your percentage of ownership has declined and I don't know about you but I call that stealing!
So while the SEC is after Cuban, maybe they should be going after the company! Cuban could also argue, that he was being punished by the company, since by informing him, they in effect prevented him from taking any action regarding his holdings, since otherwise he could be prosecuted for insider trading.
There is no need to act on private information. The stock wasn't going to fall off until the word hit the street, and Cuban would not only have had time to sell his stock, but buy put options and profit from the decline, even without advance warning!
The SEC is filled with scum, as there is a lot of stuff going on in the back rooms that is illegal and the SEC does nothing. Instead they go after famous people like Martha and Mark, pretending to do something important, while more people have lost more money than ever before in a market crash, and none of the people responsible for that are under indictment.
They should be going after the president of Lehman bros. who drove a huge investment banking firm out of business and caused massive losses to share holders and Lehman employees. They should also be going after the board members who approved the executive group, since these people were obviously incompetant, and fiscally irresponsible.
So put your own personal feelings aside. (As though you really know Mark Cuban and have a right to judge him) And lets see what the SEC has. One thing I did hear, is that Cuban's case is a civil one, whereas Martha's was a criminal case.