BALTIMORE ( Stockpickr) -- Professional investors are mad (or scared) right now. And they've got a handful of stocks to blame for their troubles.It hasn't been a good time to be a pro investor lately -- just rewind back to 2011, when hedge funds (and other pro portfolios) posted their second worst year ever. The managers who took risk off the table at the end of the year missed the rally at the start of 2012, and the ones who put it back on late got hammered when Mr. Market corrected. But of all the stocks out there, these institutional investors are focusing their hatred on just four. Yes, the pros hate these four stocks right now, but that doesn't mean you should. Today, we'll take a closer look at each of them. >>5 Stocks Insiders Are Jumping Into To do that, we're focusing in on 13Fs for the last quarter. Institutional investors with more than $100 million in assets are required to file a 13F -- a form that breaks down their stock positions for public consumption. From hedge funds to mutual funds to insurance companies, any professional investors who manage more than that $100 million watermark are required to file a 13F. By comparing one quarter's filing to another, we can see how any single fund manager is moving their portfolio around -- and what investments are faring the best for them. More important, we can figure out what names are getting unloaded from institutional portfolios en masse or lost the most value for the quarter; they're the stocks that the group agrees they hate. >>ACTIVE STOCK TRADERS: Check out Stockpickr's special offer for Real Money, headlined by Jim Cramer, now! Today, we'll focus on institutional investors' five most hated stocks for the first quarter of 2012.