Only a few companies offer a mobile retargeting self-serve solution. Silverpush is one of the first companies that offer this to their clients. Their offices are located in the US and India. It gives a chance to people to retarget and analyze their users across screens.
There is in built RTB platform that enables them to accept billions of request every month. They also make sure reach and brand recall. With that it can be used on multiple devices, both web, and apps, enabling to identify and retarget the clients.