Michael Burry big short
Michael Burry.
  • Michael Burry issued a grim warning to investors by simply tweeting: "Sell."
  • The "Big Short" legend was likely responding to the stock market's astounding comeback in January.
  • Burry recently compared the S&P 500's rebound to its short-lived rally during the dot-com crash.

Michael Burry appears to have serious doubts about the stock market's stunning start to the year. He tweeted a single word on Tuesday: "Sell."

The fund manager of "The Big Short" fame was likely urging investors not to be fooled by the recent rebound in stocks. The benchmark S&P 500 index gained 6.2% in January, while the tech-heavy Nasdaq Composite surged 11%, marking its best January performance since 2001.