The SEC web site has a searchable interface for mutual fund data.
Bloomberg provides mutual fund information, including Mutual Fund Performance and Mutual Fund Rankings. Additionally, it is an excellent source for hedge fund data. Start with their Hedge Fund Home Page (HFND) and get more information from their hedge fund rankings (WHF) and news (HEDN).
Johnson students can use Bigdough to screen for fund companies and traders (Available only to Johnson students.)