AppNexus

Rebranded

New York, New York, United States · Founded 2007

1001-5000 employees · N/A

Sourced & current · updated Jul 3, 2026Website

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 one of the largest independent programmatic ad exchanges and ad tech platforms globally before being rebranded as Xandr under AT&T and later absorbed into Microsoft Advertising.