Companies

History Channel is a leading cable and satellite television network owned by A&E Networks, delivering historical, documentary, and reality programming to over 90 million U.S. households.

Hitachi Vantara — recorded in ATDb as the acquirer/parent of one or more AdTech companies (s375 lineage backfill).

Hitsteps is a real-time website analytics and live chat platform designed to help businesses understand visitor behavior and engage with customers directly. It provides detailed insights into who is on your site, what they are doing, and where they came from, enabling better conversion optimization and customer support.

Hive is a collaborative work management platform purpose-built for marketing and creative teams that require sophisticated project coordination integrated with creative-specific workflows. The platform addresses the operational complexities inherent to creative work by unifying project management, digital asset management, approval workflows, and resource planning within a single workspace. By consolidating communication channels, task tracking mechanisms, and file collaboration tools, Hive e...

Hive9 was a marketing performance management platform that helped B2B marketers plan, execute, and measure marketing investments with revenue impact visibility.

Hivestack is a leading technology company specializing in programmatic digital out-of-home (DOOH) advertising, operating as a comprehensive supply-side platform (SSP) that bridges the gap between traditional outdoor advertising and modern digital advertising ecosystems. The company has developed an integrated technology stack encompassing both supply-side and demand-side platforms, along with a specialized ad server designed exclusively for DOOH environments. This end-to-end solution enables ...

Hogarth Worldwide is WPP's content production powerhouse — 10,000+ staff. Acquired by WPP 2008. Provides scaled production + adaptation services across video, digital, print. **Note: WPP announced January 2026 that Hogarth Worldwide is being retired and folded into a new "WPP Production" unit launching February 23, 2026.**

Holoxica is a pioneering technology company specializing in advanced holographic and volumetric display systems that enable true three-dimensional visualization without requiring specialized eyewear or virtual reality headsets. The company has developed proprietary optical engineering, photonics expertise, and computational imaging algorithms to create holographic displays that preserve natural depth perception, parallax effects, and spatial relationships critical for accurate interpretation ...

Home Depot's retail media network offering advertising solutions to brands and suppliers across its digital and in-store properties.

Home Depot's retail media network enabling brands to reach high-intent home improvement shoppers across its owned digital and in-store properties.

HookLogic was an early commerce-media platform acquired by Criteo in November 2016 for $250M. Pioneer of retail-media sponsored-product ads on retailer.com properties. Brand retired post-acquisition; tech became the foundation of what's now Criteo Retail Media Platform (RMP).

Hootsuite is a leading social media management platform that helps organizations and individuals manage their social media presence across multiple platforms, including Twitter, Facebook, LinkedIn, and Instagram.

Hopper is a travel booking app that uses AI and predictive analytics to help users find and book flights, hotels, and rental cars at optimal prices.

HOQU was a blockchain-based affiliate marketing platform that aimed to create a decentralized performance marketing ecosystem using smart contracts.

Horizon Media is one of the largest independent media agencies in the United States, providing media planning, buying, and marketing services across all channels.

Hotels.com is a leading online travel agency specializing in hotel bookings and accommodation reservations worldwide, operating as part of Expedia Group's portfolio of travel brands.

Hotjar is a behavior analytics platform that helps product teams and marketers understand how users interact with their websites through heatmaps, session recordings, and feedback tools. Acquired by Contentsquare in 2021, it continues to operate as a distinct brand.

Huawei is a multinational technology company that specializes in telecommunications equipment, consumer electronics, and enterprise solutions. It is one of the largest telecommunications equipment manufacturers in the world.

HubSpot is a leading CRM and inbound marketing platform that helps businesses attract, engage, and delight customers through integrated marketing, sales, and service tools.

Email marketing platform within HubSpot's comprehensive CRM and marketing automation suite, offering tools for creating, sending, and analyzing email campaigns.

Huge is a global digital agency specializing in design, technology, and marketing services for major brands, operating as a subsidiary of IPG since 2013.

Hugging Face is an AI platform and community that provides tools, models, and infrastructure for building, training, and deploying machine learning models, particularly focused on natural language processing and generative AI.

Hull.io was a customer data platform (CDP) that unified user data across tools and teams — acquired by MessageBird (now Bird) in March 2021 and subsequently absorbed into its omnichannel communications platform.

Premium streaming service offering on-demand TV shows, movies, and live TV with ad-supported and ad-free subscription tiers.