$Tesla Motors(TSLA)$ Elon Musk has exercised all of his tesla options expiring next year, signaling an end to his stock sales that triggered a fall in the share price of the world's most valuable carmaker, and meaning tesla shares may rebound sharply. In the process, tesla shares lost about a quarter of their value after Musk in November asked his followers on Twitter if he should sell 10% of his holdings. They have rebounded to $1,088.47, but are still below the record closing high of $1,229.91 in November. Tesla's stock price has been affected by Musk's share sale, there are three main factors: First, investors often view stock sales by so-called insiders, such as executives and board members, as negative because they believe insid