David Einhorn may write in his latest quarterly letter to investors that "from a portfolio perspective, this quarter was a quiet one" but based on his activity the famous poker playing hedge fund manager was quite busy.

Among his various moves, Greenlight added a new position in Perrigo in the first quarter, after several large guidance cuts, and now sees the company's earnings forecast as achievable. He also took a new long position in Conduent, as he believes the company as burdened with "underearning" contracts that it can renegotiate and exit. He also took a new long in unidentified European financial institution. On the other side, Greenlight closed shorts in Signet Jewelers, LyondelBasell, and RPC and also closed out shorts in three Canadian banks at a loss after oil and credit loss thesis didn't "sufficiently" materialize.

Einhorn said he still likes Apple, which is a "superior company that still trades for less than a market multiple" while trimming his short position in Rite Aid after initially expecting deal with Walgreens to close at $9-share with FTC approval, and is watching the RAD situation "carefully" as original thinking was incorrect.