A
AppNexus
RebrandedNew York, New York, United States · Founded 2007
1001-5000 employees · N/A
AppNexus was a leading independent programmatic advertising technology platform that powered real-time bidding and ad exchanges before being acquired by AT&T in 2018.
Where they sit
Stack tier: Core Platforms (S)
Demand Side Platform (DSP)Supply Side Platform (SSP)Programmatic Platform
Was the largest independent programmatic ad tech platform globally, competing directly with Google's DoubleClick as a neutral, open-stack alternative for publishers, advertisers, and agencies.