Elon Musk's purchase of over 2.57 million Tesla Inc. TSLA shares totaling $1 billion is the biggest market-open insider trade for the EV giant since it went public in 2010. With that said, here's a look at some of Tesla's biggest market-open insider trades.Check out the current price of TSLA stock here.Elon Musk's Other Market-Open Tesla TradesBesides the recent insider purchase, Musk has previously made big purchases of Tesla stock on multiple occasions. According to official SEC filings, Musk bought over ...