Academic

According to the SEC, the answer is yes, and he has been so charged for selling his entire stock in an internet company to avoid a loss ... because the company was getting more financing?  Strange.  Anyway, Mark Cuban is the thinking person's billionaire.  He has views that aren't anodyne, he knows how to speak (and to blog), and he is making Dallas a better place ... but he will never be a senator now. 

In my view, the real surprise is that the case didn't settle.  I wouldn't want to take something against Cuban to a Dallas jury.  And if I were Cuban, I wouldn't want to be labeled an insider trader.

UPDATE: Here's Bainbridge with a timely analysis - he thinks it wasn't about the money, among other things - and he wrote the book on insider trading, literally.