Companies

OneView is a programmatic advertising technology platform specializing in converged TV advertising solutions that bridge traditional linear television and modern digital streaming environments. The company addresses the critical challenge of audience fragmentation across cable, satellite, over-the-air broadcast, and multiple streaming services by providing unified programmatic access to both legacy broadcast inventory and connected TV (CTV) placements through a single integrated platform. Thi...

Onfido is an AI-powered identity verification and authentication platform that helps businesses verify real user identities using document checks and biometric analysis.

Ontology is a high-performance public blockchain infrastructure provider that specializes in decentralized identity solutions and secure data management for enterprise applications. Operating as a dual-token blockchain network utilizing ONT and ONG tokens, the platform combines distributed ledger technology with digital identity verification systems to create comprehensive trust frameworks for organizations across financial services, healthcare, government, and enterprise sectors. Ontology's ...

Ontraport is a comprehensive business automation platform that combines customer relationship management (CRM), marketing automation, and e-commerce capabilities into a unified solution. The platform is designed to help small to medium-sized businesses streamline their operations by automating repetitive tasks, managing customer relationships, and executing sophisticated marketing campaigns without requiring extensive technical expertise. Ontraport serves entrepreneurs, digital marketers, and...

Oodle is a classified advertising platform and technology provider that aggregates listings from various sources and distributes them across partner networks.

AI-powered UA & monetization platform acquired by AppsFlyer December 5 2023 (all-stock).

Ooyala was a video technology platform that provided online video publishing, analytics, and monetization solutions before being acquired and eventually shut down.

Google's server-side header-bidding product within Google Ad Manager, formerly known as Exchange Bidding (or Exchange Bidding in Dynamic Allocation, EBDA). Allows third-party SSPs/exchanges to compete with Authorized Buyers in real-time auctions. The Trade Desk publicly exited Open Bidding April 2025, citing GAM transparency concerns — a notable industry signal favoring Prebid + alternatives. Distinct from header bidding (client-side); Open Bidding is server-side via GAM.

Open Web Analytics is an open-source web analytics platform that provides organizations with complete control over their website visitor data while delivering comprehensive insights into user behavior and engagement. As a self-hosted alternative to proprietary analytics solutions like Google Analytics, the platform offers extensive tracking capabilities including page views, event monitoring, e-commerce transaction analysis, and detailed visitor profiling—all while ensuring data sovereignty...

The Trade Desk's sell-side prebid wrapper / publisher auction platform. Launched October 2 2025 with first-wave publisher partners (AccuWeather, BuzzFeed, Hearst, Guardian, Ziff Davis). Forks Prebid code with mandatory TID sharing; integrates with OpenPath. Major strategic move into the sell-side — distinct from OpenPath (which is supply-path optimization for buyers).

OpenAI is the creator of ChatGPT and the GPT series of large language models, providing cutting-edge AI APIs and tools that are rapidly transforming advertising, content creation, and marketing technology.

OpenInfluence is a global influencer marketing company that connects brands with relevant creators to execute data-driven campaigns. They leverage proprietary technology and a vast network of influencers to deliver measurable results across various social media platforms, helping brands achieve their marketing objectives.

OpenPath is The Trade Desk's direct supply path to publishers via Prebid, launched February 2022. Bypasses traditional SSPs in some integrations to give TTD direct access to publisher inventory. Has had publisher pull-back in 2025 amid auction-quality concerns.

Industry consortium that develops and maintains the OpenRTB protocol, the standard specification for real-time bidding in programmatic advertising.

OpenSlate is a leading provider of brand safety and suitability solutions for digital advertising. The company's platform analyzes and classifies online content to help brands and agencies ensure their ads are placed in brand-safe and suitable environments.

Audience-engagement and conversation platform with an advertising business.

PubMatic's flagship Prebid-based header bidding wrapper for publishers across web, mobile, and CTV/OTT. Launched 2017.

OpenX is a global leader in digital advertising technology, helping publishers and buyers monetize their digital assets through a suite of programmatic tools and solutions.

OpenX's software suite for building advertising solutions. Launched January 6 2026.

OpenX advanced supply-side targeting and curation platform for brands and agencies. Launched July 16 2025.

Opera is a global web browser company with a significant advertising business, operating ad platforms and monetization solutions across mobile and desktop browsers.

Opera Ads is the advertising division of Opera, offering native advertising and performance marketing solutions across Opera's browser ecosystem and partner network.

OPPO Ads is the advertising platform of OPPO, one of the world's largest smartphone manufacturers, enabling brands to reach hundreds of millions of OPPO device users across its native app ecosystem.

Opt Inc. is a performance marketing and customer acquisition platform that helps brands optimize digital advertising spend across channels through data-driven automation and analytics.