William Hunt "Bill" Gross is an American investor and fund manager, best known for co-founding Pacific Investment Management Co. PIMCO is a global fixed income investment company. Gross ran their $270 billion Total Return Fund (PTTRX), before leaving to join Janus Capital Group in September 2014.

Pacific Investment Management Company, LLC is an American investment management firm focusing on active fixed income management worldwide. PIMCO manages investments in many asset classes such as fixed income, equities, commodities, asset allocation, ETFs, hedge funds, and private equity. PIMCO is one of the largest investment managers, actively managing more than $2 trillion in assets for central banks, sovereign wealth funds, pension funds, corporations, foundations and endowments, and individual investors around the world. According to the Sovereign Wealth Fund Institute, PIMCO is the 6th-largest asset manager in the world by managed AUM.