Companies

Havas PR is a global public relations network operating under the Havas Group umbrella, delivering integrated communications, media relations, and reputation management services.

Hawk (formerly TabMo) is a French omnichannel advertising technology company and demand-side platform (DSP), headquartered in Paris. Its buying platform lets media agencies and advertisers plan, activate, and optimize campaigns across display, video, audio, digital out-of-home (DOOH), connected TV (CTV), and in-game inventory from a single interface. Hawk was acquired by Azerion in October 2023.

Home Box Office (HBO) is the premium cable TV brand under Warner Bros. Discovery. Launched 1972. Notable shows: Game of Thrones, The Sopranos, Succession, The Last of Us. Distinct from HBO Max streaming (the streaming service brand).

HBO Max is Warner Bros. Discovery's flagship premium streaming service. Complex naming history: HBO Max launched May 2020 → renamed Max May 2023 (when Discovery+ was merged in) → renamed BACK to HBO Max July 9, 2025. Major CTV ad surface (ad-supported tier launched June 2021).

Healthgrades is a leading online platform connecting patients with healthcare providers through physician ratings, reviews, and appointment scheduling.

Healthline FindCare is a healthcare provider directory and patient acquisition platform that connects consumers with healthcare providers through Healthline Media's health information network.

Healthline Media is a leading digital health publisher providing consumer health information and operating advertising-supported health content websites.

Healthcare real-world-data and identity company; acquired Symphony Health from ICON in 2026.

Heap is a digital insights platform that automatically captures every user interaction on web and mobile apps, eliminating the need for manual event tracking instrumentation.

Heap Premier is the enterprise-tier offering of Heap's advanced digital analytics platform, designed specifically for large-scale organizations that require comprehensive user behavior intelligence without manual event tracking constraints. The platform's revolutionary approach centers on automatic event capture technology that retroactively collects and indexes every user interaction across digital properties, enabling analysts to query historical data for events that weren't explicitly defi...

Data-led media agency built for AT&T account 2016; specialist scale, smaller than OMD/PHD. Operates under Omnicom Media post-merger.

San Francisco creative agency, founded 2004, acquired by Deloitte Digital Feb-Mar 2016 (11th Deloitte Digital acquisition). Multi-Cannes-Lions winner. Operates under Heat brand within Deloitte Digital; opened NYC office post-acquisition. Sources: PR Newswire + The Drum + AdWeek.

Hedera Hashgraph is an enterprise-grade public distributed ledger technology platform that provides a fundamentally different approach to blockchain consensus mechanisms. Unlike traditional blockchain architectures, Hedera utilizes the patented Hashgraph consensus algorithm, which enables high-throughput transaction processing with low latency, fair transaction ordering, and enhanced security guarantees. The platform is designed to support a wide range of decentralized applications, including...

Heepsy is a specialized influencer marketing platform that empowers brands, agencies, and marketers to discover, analyze, and evaluate influencers across Instagram and YouTube. The platform combines advanced search functionality with comprehensive analytics capabilities, enabling users to filter potential influencer partners based on critical criteria including audience demographics, engagement rates, follower authenticity, geographic location, and niche categories. By providing transparent a...

Heimat Berlin is an independent German creative agency known for bold, culturally resonant advertising campaigns with a strong strategic and creative foundation.

Helium 10 is a comprehensive software suite for Amazon sellers, offering tools for product research, keyword optimization, listing management, and analytics — now operating under the Thrasio umbrella.

Indian-market social platform (regional Indian languages, multi-format), launched June 2018. ~40M users at peak. Banned by India June 2020 along with TikTok; India business officially shuttered January 2021.

Help Scout is a customer service software platform designed to help growing businesses deliver exceptional customer support experiences. The company provides a comprehensive suite of tools including shared inbox management, knowledge base software, and customer communication features that enable support teams to collaborate effectively while maintaining personalized interactions with customers. Help Scout's platform emphasizes simplicity and user experience, making it particularly popular amo...

Helpshift is an AI-powered customer service platform specializing in in-app and digital support, acquired by Keywords Studios in 2023 to serve mobile gaming and consumer app companies.

Asia-Pacific digital media network acquired by Publicis Groupe for influencer + creator-economy capabilities.

HERE Technologies is a global leader in location data and mapping technology, providing precise geospatial intelligence and location services to enterprises, automotive OEMs, and developers worldwide.

Hevo Data is a no-code data pipeline platform that helps businesses integrate data from various sources into their data warehouses or destinations. It automates the process of data extraction, transformation, and loading (ETL/ELT), enabling data teams to focus on analytics rather than pipeline maintenance.

Hex Technologies is a collaborative, AI-powered data-analytics workspace (hex.tech) that unifies SQL, Python, R and agentic AI for data teams. Founded 2020, San Francisco. (Distinct from WPP's creative studio HEX.)

HEX is WPP's AI-driven creative studio — part creative production studio, part R&D lab, part consultancy — launched June 2026 within WPP Production, staffed by ~50 Gen-Z creative technologists. (Distinct from Hex Technologies, the data-analytics company.)