The question is how the executives can trade their shares. Reuters reports that it is fine by Securities and Exchange Commission (SEC) rules for executives to use something called a 10b5-1 plan to trade their own stock, "even when they have access to private information." The subpoena does not seem to have anything to do with questions over whether Tesla CEO Elon Musk's recent "overzealous" Tweet was in any way illegal.
This week, analysts at Longboard Asset Management said they believe Tesla common stock will hit $100 in the next 18 months on the way to $200 per share within five years. In any case, we'll have more information ammunition for the debate when Tesla releases first quarter results May 8th.