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Brief
Sizmek merged into Amazon Ad Server (Jan 2024) and ceased operations on January 1, 2024
Sizmek

Sizmek

Ad Serving & Programmatic Advertisingsizmek.com

Sizmek was a global, multichannel ad server — now merged into Amazon Ad Server — used by advertisers and agencies to create, manage, and deliver digital advertising campaigns across multiple channels and screens.

Last updated Oct 5, 2026 by the ATDb Editorial Team

Founded
2000
HQ
New York, New York, United States
Parent
Connections
39

AI-drafted from public sources26 sources cited

At a glance

Employees
1001-5000
Funding
$52.8M
Revenue
$100M-$250M
Stock
NASDAQ:SZMK
20integrations11competitors2corporate family

About

Formerly one of the largest independent ad servers globally; a neutral alternative to Google's ad tech stack before being acquired by Amazon and discontinued

Sizmek was a global, multichannel ad server — now merged into Amazon Ad Server — used by advertisers and agencies to create, manage, and deliver digital advertising campaigns across multiple channels and screens. It employed a powerful AI platform to make display decisions across the customer journey, using gathered data to target individuals with relevant messages on the right content platforms at the right time, with the goal of turning impressions into conversions. The platform offered multiple options for creative authoring, streamlined campaign management, advanced dynamic creative optimization, and Media Rating Council-accredited measurement, giving customers creative control while centralizing cross-channel insights to aid in campaign optimization. Its full-funnel reporting enabled advertisers to gather detailed information about touchpoints and the customer journey to conversion, while data-driven campaign management tools allowed advertisers to gain insights into campaign performance using MRC-accredited metrics. At its peak, Sizmek operated in more than 70 countries, connecting more than 20,000 advertisers with 3,600 audiences around the globe. Sizmek went public in 2013, was delisted by NASDAQ in 2016, and ultimately ended in bankruptcy in 2019, after which its core ad server business was acquired by Amazon. Source 1: datachannel.co — Sizmek Ad Suite for Creative Building, Distribution & ... Source 2: escape-velocity.com — Sizmek Ad Suite - DCO, Ad Server and Creative Building Source 3: thebannermen.com — Amazon Ads | Sizmek Ad Server Source 4: adexchanger.com — Bye-Bye Sizmek! Amazon Advances Flashtalking And ...

Business model

SaaS

Target market

Enterprise

What they offer

  • Sizmek Ad Suite

    Core ad serving platform for managing and trafficking digital ad campaigns across display, video, mobile, and social channels

  • Dynamic Creative Optimization (DCO)

    Tools for personalizing and optimizing ad creatives in real time based on audience data and contextual signals

  • Peer39 Contextual Targeting

    Semantic and contextual data targeting solution acquired by Sizmek, enabling brand-safe and relevant ad placements

  • Rocket Fuel DMP/DSP

    Demand-side platform and data management capabilities acquired from Rocket Fuel, providing AI-driven programmatic buying

  • PointRoll Rich Media

    Rich media and interactive ad format creation tools acquired from PointRoll

Key features

Cross-channel ad serving (display, video, mobile, social)Dynamic creative optimization and personalizationProgrammatic buying via integrated DSPContextual and semantic data targetingCampaign analytics and reportingThird-party data integrationBrand safety toolsRich media ad format support

Use cases

Cross-channel digital advertising campaign managementProgrammatic media buying and optimizationDynamic creative personalization at scaleBrand safety and contextual targetingAgency ad operations and traffickingAudience data management and activation

Customer segments

Global advertising agenciesEnterprise brand advertisersMedia buying groupsPublishersAd networks

Tech & specs

Technology stack

Cloud-based ad serving infrastructureMachine learning and AI (via Rocket Fuel)Semantic analysis engine (via Peer39)Real-time bidding (RTB) infrastructureAPI-based integrations

Security & compliance

GDPRCCPAIAB standards complianceTAG Brand Safety certification

Deployment

Cloud

API

Yes

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