Federal Home Loan Mortgage Corporation

Federal Home Loan Mortgage Corporation, also known as Freddie Mac, is a government-sponsored enterprise that was created to expand the secondary market for mortgages in the US. It buys mortgages on the secondary market, pools them, and sells them as mortgage-backed securities. It ranks 38th on the 2018 Fortune 500 list of largest US corporations by total revenue. 

Guaranteed Rate Inc.

Guaranteed Rate, Inc. is an American residential mortgage company. It was a top 5 mortgage lender in 2016.

Nationstar Mortgage LLC

Nationstar Mortgage, LLC is a subsidiary of Nationstar Mortgage Holdings, Inc. and does business as Mr. Cooper. It provides servicing for mortgages, including reverse mortgages.

Walter Investment Management Corporation

Walter Investment Management Corporation makes and services mortgage loans and reverse mortgage loans. It also services loans for Ginnie Mae, Fannie Mae, and other US government-sponsored entities (GSEs), third-party securitization trusts, and other owners of credit. 

Quicken Loans Inc.

Quicken Loans, Inc. is one of the largest mortgage lending companies in the US, using online applications rather than traditional brick-and-mortar branch locations.