Blackstone Credit, formerly known as GSO Capital Partners (GSO) is an American hedge fund and the credit investment arm of The Blackstone Group. Blackstone Credit is one of the largest credit-oriented alternative asset managers in the world and a major participant in the leveraged finance marketplace. The firm invests across a variety of credit oriented strategies and products including collateralized loan obligation vehicles investing in secured loans, hedge funds focused on special situations investments, mezzanine debt funds and private equity funds focused on rescue financing.