Einhorn: Here's what I'm still long and short

David Einhorn, president of Greenlight Capital.
Katie Young | CNBC

Widely followed hedge fund manager David Einhorn reiterated his belief in two existing positions at an investment conference Tuesday: A short bet against Athenahealth and a long play in AerCap, according to a person who witnessed the presentation.

The remarks were made at an event hosted by Grant's Interest Rate Observer in New York. A spokesman for Einhorn's Greenlight Capital declined to comment.