Companies
3,615 companies in the AdTech ecosystem
Cheil Worldwide
Advertising & Marketing Holding
South Korea's largest advertising and marketing agency, founded January 17, 1973 as the in-house agency for Samsung Group. Listed on the Korea Exchange (KRX: 030000); Samsung Electronics holds ~28.4% as the largest shareholder, with National Pension Service at ~12%. World's 10th-largest agency network with FY2024 revenue of ₩4.34T (~$3.1B; +4.98% YoY) and 53 offices across 44 countries staffed by ~7,000 employees. Headquartered in Seoul. CEO Kim Jong-hyun (since December 2022). Samsung remains the anchor client; over-reliance on Samsung is documented as a qualitative strategic concern but no specific revenue-share percentage is publicly disclosed. Sources: Wikipedia + MarketScreener + Nasdaq.
Chemistry
Full-Service Advertising Agency
Chemistry is an independent, full-service advertising agency that blends data-driven strategy with creative execution to help brands build meaningful connections with consumers.
CHEQ
Ad Fraud & Go-to-Market Security
CHEQ is an AI-powered cybersecurity company that provides a suite of solutions to protect businesses from online fraud, account takeover, and other digital threats.
Chewy Ads
Retail Media / E-Commerce Advertising
Chewy's retail media network offering pet-focused advertising solutions to brands looking to reach highly engaged pet owners on the Chewy platform.
Chili Piper
MarTech/SalesTech (Revenue Operations)
Chili Piper is a SaaS platform that automates meeting scheduling and lead routing for B2B sales teams, helping companies convert inbound leads faster.
Chitika
DefunctAd Networks & Publisher Monetization
Chitika was a search-targeted online advertising network that served billions of ads monthly to publishers outside of Google's ecosystem, specializing in intent-based display advertising.
Chocolate Platform
Influencer Marketing Technology / Social Commerce
Chocolate Platform is a social commerce and influencer marketing technology company that connects brands with content creators. The platform provides tools for influencer discovery, campaign management, and performance tracking with integrated e-commerce capabilities.
Choozle
Programmatic Advertising / Demand-Side Platform (DSP)
Choozle is a leading programmatic advertising platform that empowers digital marketers to plan, buy, and optimize digital ad campaigns across display, video, mobile, and social channels.
Choreograph
Data Platforms / AdTech Infrastructure
Choreograph is WPP's data company — formed April 2021 from the merger of Wunderman Thompson Data + GroupM MPlatform. Provides audience data, identity, and analytics infrastructure across all WPP agencies. Now part of WPP Media (post-2025 GroupM rebrand).
Chorus.ai
AcquiredConversation Intelligence / Sales Technology
Chorus.ai is a leading conversation intelligence platform acquired by ZoomInfo that records, transcribes, and analyzes sales calls and meetings to help revenue teams improve performance.
Churnzero
Customer Success Platform (MarTech/Customer Engagement, not AdTech)
ChurnZero is a leading Customer Success platform designed for subscription businesses to combat churn and drive growth. It provides a comprehensive suite of tools that enable customer success teams to understand customer health, automate personalized experiences, and engage proactively. The platform helps businesses manage the entire customer lifecycle, from onboarding to renewal, ensuring customers achieve value from their products.
Cimagine Media
DefunctAugmented Reality / AR Commerce
AR commerce startup acquired by Snap Dec 2016. Tech integrated into AR Try-On features.
Cincopa
Digital Asset Management / Content Delivery
Cincopa is a comprehensive digital asset management (DAM) platform that enables businesses to host, manage, and embed various media types like videos, images, audio, and documents. It provides customizable galleries, advanced analytics, and integrations to enhance online content delivery and engagement across websites and digital channels.
Cint
Market Research & Consumer Insights Technology
Cint is a global software leader in digital insights and research technology, connecting researchers with consumers through the world's largest consumer network for survey-based research.
Circana
Market Research & Analytics/Data Provider
Circana is a leading market research and analytics firm formed from the 2022 merger of IRI and NPD Group, providing consumer behavior insights and purchase data across retail and CPG industries.
CircleCI
DevOps & Continuous Integration/Continuous Delivery (CI/CD)
CircleCI is a leading continuous integration and continuous delivery (CI/CD) platform that empowers software development teams to automate their build, test, and deployment processes. The company provides cloud-native developer tools that enable engineering organizations to release code with confidence and speed, reducing the time from commit to deployment while maintaining high quality standards. CircleCI's platform is designed to integrate seamlessly into modern development workflows, suppo...
Cisco Meraki
Physical Security & Video Surveillance
Cisco Meraki provides cloud-managed IT solutions including wireless, switching, security, and IoT devices for simplified network management.
Cision
PR Technology / Earned Media Intelligence
Cision is a leading PR and earned media software platform that helps brands monitor, analyze, and amplify their communications across global media channels.
Citizen Relations
Earned-Media & Public Relations Agency
Citizen Relations is a North American earned-media + PR agency, headquartered in Toronto with offices across Canada and the US. Originally part of the Vision7 group, transferred to BlueFocus in 2017 and divested to Plus Company in May 2021. Specializes in influencer + earned-media + brand PR. Sources: Plus Company portfolio + Citizen Relations.
CitrusAd
Retail Media
CitrusAd is a retail media platform that enables retailers to monetize their digital properties through sponsored product ads, now operating as part of Publicis Groupe.
Civic
Identity Verification / Blockchain Infrastructure
Civic Technologies is a leading provider of decentralized identity verification solutions, leveraging blockchain technology to empower users with control over their personal data. Their platform enables businesses to securely verify identities, streamline onboarding processes, and reduce fraud while enhancing user privacy.
CJ Affiliate
Affiliate Marketing
CJ Affiliate is a global affiliate marketing network connecting advertisers with publishers to drive performance-based customer acquisition and sales.
Clarabridge
AcquiredCustomer Experience Management / Text Analytics
Clarabridge was a leading customer experience management (CEM) platform that used AI-powered text analytics to transform customer feedback into actionable insights — acquired by Qualtrics in 2021.
Claravine
Marketing Data Governance / MarTech
Claravine is a marketing data governance platform that helps organizations standardize, control, and connect their marketing data from the point of creation. It ensures data quality and consistency across various marketing and advertising channels, enabling more accurate analytics, better activation, and improved compliance.