George Soros, Steve Cohen, and Jim Simons' funds piled into Tesla and other trendy names last quarter, while Jim Chanos took aim at meme stocks. Here's a roundup of 5 key trades.

• Several elite investors took positions in Tesla and other trendy stocks last quarter.
• George Soros, Steve Cohen, and Jim Simons' funds bet big on Elon Musk's car company.
• Short seller Jim Chanos placed wagers against Tesla, AMC, and other high-flying stocks.

Some of the world's top investors piled into Tesla and other trendy stocks last quarter, while a notable short seller bet against them.