Greenlight Capital returned 4.3% in April, bringing its year-to-date gain to 3.1%.
New York-based Greenlight said in an investor letter last week obtained by Reuters that the firm started to short a group of momentum stocks.
Greenlight founder and president David Einhorn made headlines recently when he warned investors of a second tech bubble.
“There is a clear consensus that we are witnessing our second tech bubble in 15 years,” Einhorn said. “What is uncertain is how much further the bubble can expand, and what might pop it.”
Founded in 1996, Greenlight has about $10 billion in assets under management.