BALTIMORE ( Stockpickr) -- It's 13F season -- that magical time each quarter when we get to sneak a peek into the portfolios of Wall Street's most well-known money managers. But while most investors concern themselves with the stocks that the pros love, they're ignoring a group that's just as important: the stocks they hate. >>5 Stocks Warren Buffet Is Buying in 2013 After all, if you'd consider adding a stock because institutions are buying with both hands, then the names portfolio managers are cutting loose are throwing up some serious red flags. To figure out which names hedge funds, pensions, mutual funds and other groups of professional investors are shedding, we're taking a look at the aggregated 13F filings that 3,325 firms just submitted for the second quarter of 2013. 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. And I'll give you a hint: Funds' sell list is skewed against tech, pharma and gold names this quarter. >>5 Stocks Under $10 Hedge Funds Love Without further ado, here's a look at seven stocks fund managers hate.