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AppNexus

AppNexus

Rebranded

New York, NY, United States · Founded 2007

1001-5000 employees · N/A

Sourced & current · updated Aug 24, 20261 of 5 facts verifiedWebsite

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 prior to acquisition, serving as a neutral open alternative to Google's DoubleClick and other walled garden platforms.

Ownership

Parent: Microsoft (via Xandr acquisition)

Competitors

Recent moves

In their space

Pre-call brief from ATDb — sourced from the live database, current as of Aug 24, 2026. Not a static screenshot.