The company's founder has been selling billions of stock of the AI server-maker all year. It's always an interesting time when a notable shareholder or executive at a major company buys or sells a lot of stock. Unfortunately for Dell Technologies (DELL 0.27%) shareholders, founder, chairman, and CEO Michael Dell disclosed a massive share sale on Monday. Dell had been thought of as a recent AI winner, and a relatively low-valued one at that. The stock, while up 57% on the year, is still more than 33% below i ...