Fannie Mae and Freddie Mac
Also called Fannie Mae, Freddie Mac, the Enterprises.
Two companies that buy home loans from lenders and package many of them into securities. FHFA regulates them.
The FHFA House Price Index uses the mortgages they bought or securitized, going back to 1975. Source 1
FHFA, created in 2008, regulates both companies and the Federal Home Loan Banks, and has been the conservator of Fannie Mae and Freddie Mac since September 2008. Source 2
Freddie Mac also publishes the weekly mortgage rate survey. Source 3