Caesars Entertainment, one of the world's largest casino entertainment providers owned by TPG and Apollo, filed on Tuesday with the SEC to raise up to $50 million in an initial public offering. The company formerly known as Harrah's Entertainment had originally tried to go public in late 2010, but was unsuccessful due in part to concerns over its massive debt load. Caesars had aimed to raise up to $500 million in its previous IPO attempt. The Las Vegas, NV-based company, which was founded in 1989 and booked $8.8 billion in sales for the 12 months ended September 30, 2011, plans to list under the symbol CZR but has yet to determine an exchange. No underwriters were listed in the initial filing. No pricing terms were disclosed.