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AppNexus

AppNexus

Rebranded

New York, NY, United States · Founded 2007

1001-5000 employees · ~$290M

Sourced & current · updated Oct 26, 20261 of 5 facts verifiedWebsite

AppNexus was an American multinational technology company that operated a cloud-based software platform enabling and optimizing programmatic online advertising, founded in 2007 by former Right Media staff, CTO Brian O'Kelley, and Mike Nolet.

Where they sit

Stack tier: Core Platforms (S)

Demand Side Platform (DSP)Supply Side Platform (SSP)Programmatic Platform

One of the largest independent programmatic advertising platforms prior to acquisition, competing directly with Google DoubleClick as a full-stack buy-side and sell-side ad tech provider

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 Oct 26, 2026. Not a static screenshot.