Existing Homes Sales 
The most closely followed housing statistic by the markets is Existing Homes sales compiled by the NAR (National Association of Realtors). Existing-Home Sales data come out On or about the 25th of each month. The report contains statistics on sales and prices of existing single-family homes for the nation and the four regions. These figures include condos and co-ops, in addition to single-family homes.

Pending Homes Sales
The Pending Homes sales index is produced monthly by the NAR. Pending Home Sales become Existing-Home Sales one-to-two months later. 

The index derived from Pending Home Sales is used to predict Existing Home Sales, which is the most important U.S. housing statistic.