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Sizmek

Defunct

New York, New York, United States · Founded 2000

1001-5000 employees · NASDAQ:SZMK

Sourced & current · updated May 29, 20260 of 5 facts verifiedWebsite

Sizmek was a leading independent ad serving and programmatic advertising platform that powered campaigns across display, video, mobile, and social channels before filing for bankruptcy in 2019.

Where they sit

Stack tier: Ecosystem Services (A)

Creative Management PlatformVideo Advertising PlatformProgrammatic Platform

Was one of the largest independent buy-side ad platforms globally, competing directly with Google Campaign Manager as a neutral, non-walled-garden alternative for agencies and advertisers.

Ownership

Parent: Amazon

Subsidiaries

Competitors

Recent moves

In their space

Pre-call brief from ATDb — sourced from the live database, current as of May 29, 2026. Not a static screenshot.