Greenlight CapitalGreenlight Capital | David Einhorn HoldingsThis post is being written as part of HedgeFundBlogger.com's Investment Securities Tool which analyzes the holdings of hedge fund managers.I like to track a variety of hedge funds with different strategies just to see what everyone is up to each quarter. And, while I don't necessarily go in-depth on each fund, I do like to monitor major changes to their portfolios. One main activist fund I follow is Greenlight Capital. Greenlight is a $6 billion fund ran by David Einhorn and has had an annual return of over 25%. Greenlight specializes in spin-offs and value investing. Einhorn's name has been popping up in the media a lot in recent months as he talked about his well documented short position in Lehman Brothers (LEH).So, after ...