Federal Home Loan Mortgage Corporation is a government-sponsored enterprise (GSE). The Company is engaged in purchasing residential mortgage loans originated by lenders. The Company also invests in mortgage loans and mortgage-related securities. Its segments include Single-family Guarantee, Multifamily, Investments and All Other. The Single-family Guarantee segment includes the purchase, securitization and guarantee of single-family loans and the management of single-family credit risk. The Multifamily segment includes the purchase, securitization and guarantee of multifamily loans and securities; its investments in these loans and securities, and the management of multifamily mortgage credit risk and mortgage market spread risk. The Investments segment manages its mortgage-related investments portfolio (excluding Multifamily segment investments, single-family seriously delinquent loans, and the credit risk of single-family performing loans), treasury function and interest-rate risk.