AppNexus

AppNexus is an American multinational technology company operating a cloud-based software platform that enables and optimizes programmatic online advertising. Headquartered in the Flatiron District of New York City, the company has 23 offices in North America, Latin America, Europe, Asia and Australia. Wikipedia*

On the C-SPAN Networks:
AppNexus has hosted 1 event in the C-SPAN Video Library; the first program was a 2018 Speech.