Here are some examples:

Ohio billionaire #AugustTroendle, CEO of #Medpace, repeatedly bought and sold shares of $Syneos - his company's archrival, timing the transactions with a management shakeup that dropped the stock by 16% in one day, and an SEC investigation that crushed Syneos's stock by 25%. His precision timing made him at least $2.3m in profit.

12/