This is Marty Blue from CarGurus. I want to confirm that CarGurus does request DMS data from our partner dealers in our standard contract (and it is our understanding that many other third party sites do the same) but we always ask for permission from dealers before we access that data. As the contract language states "under no circumstances will CarGurus i) use the sales data in a manner that would disclose to a viewer of any CarGurus website or third party publisher the name of the Dealer or consumer or ii) sell or otherwise license the sales data to any other person or entity. Further "CarGurus will not access or collect any non-public personal information collected by Dealer about Dealer’s customers.” In fact, we make sure to anonymize the information so we can match up sales, but do not get any personal info out of the DMS.
We use this data to improve results for our dealers. Since all our leads to dealers comes from traffic to the CarGurus website, we can use this data to understand which leads convert the best for our dealers. We hope to increase the value of our leads and improve dealer sales by tracking this data backwards and improving our understanding of the best way to target users who are serious shoppers. If any of our customers want to discuss their contract or any specific aspect of their relationship with us, we encourage them to call their Customer Service Representative directly.