David Einhorn has a clear warning for technology investors: we're in a bubble.
"Now there is a clear consensus that we are witnessing our second tech bubble in 15 years," Greenlight Capital said in an investor letter Tuesday. "What is uncertain is how much further the bubble can expand, and what might pop it."
The firm said there were several indications of the over-exuberance, including the rejection of conventional valuation methods; short sellers forced to cover their positions because of losses; and "huge" first-day stock appreciations after their initial public offerings.
"The current bubble is an echo of the previous tech bubble, but with fewer large capitalization stocks and much less public enthusiasm," the letter said. The firm said it was shorting a group of undisclosed "high-flying momentum stocks."