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.

Elon Musk.HANNIBAL HANSCHKE /Getty Images

• 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.

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

George Soros, Steve Cohen, and Jim Simons' funds bought shares of Elon Musk's automaker in the three months ended December 31, Securities and Exchange Commission filings revealed this week. Meanwhile, Ray Dalio's hedge fund boosted its bets on GameStop and AMC Entertainment, two classic meme stocks.

In contrast, Jim Chanos ramped up his wager against Tesla, and revealed a slew of bearish positions in AMC and other popular stocks.