OpenX is a programmatic advertising platform that connects publishers, advertisers, and app developers to buy and sell digital ad space in real time. Ads are traded through an auction-like marketplace where advertisers bid for impressions, and the winning bids deliver ads on display, video, or mobile formats. The platform uses real-time bidding to match advertiser goals with available inventory, aiming to maximize publishers’ revenue while helping advertisers reach their target audiences efficiently. Revenue comes from transaction fees on ad placements and premium services such as advanced analytics and audience targeting. OpenX emphasizes marketplace quality and transparency and uses data and technology to combat ad fraud and improve ad performance. Its goal is to provide a reliable, efficient marketplace that improves outcomes for both publishers and advertisers.
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Industries
Company Size
501-1,000
Company Stage
Series E
Total Funding
$75.5M
Headquarters
Pasadena, CA
Founded
2007
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Total Funding
$75.5M
Below
Industry Average
Funded Over
5 Rounds
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OpenX, a supply-side platform (SSP) for digital advertising, has appointed Robert Horler as chief executive officer. The announcement came in New York on November 2, 2026. Horler, a 30-year veteran of media, advertising, and adtech, will focus on buyer-direct relationships, AI-enabled solutions, and enterprise software. He joins as OpenX posts 15 consecutive quarters of year-over-year revenue growth. He previously founded and sold the agency Diffiniti, led Dentsu Aegis Network across the US and Northern Europe, and was chief executive officer of Whalar. He has also worked at The Financial Times and News Corp. Joshua Metzger, interim chief executive officer, returns to his role as chief legal officer.
OpenX has appointed John Rogers as Senior Vice President of Global Publisher Development. Rogers joins from Roku, where he served as Director of Global Programmatic Partnerships, bringing over 25 years of experience in digital advertising and adtech. In his new role, Rogers will lead OpenX's publisher business development and account management teams globally. He will focus on expanding CTV partnerships and live-streaming capabilities whilst helping publishers maximise yield. Rogers will work with OpenX's supply-side platform, which uses audience, contextual, quality and measurement signals to match buyers with relevant inventory. OpenX marketplace data shows 17% of campaigns included supply-side measurement in 2025, indicating buyers increasingly use signals closer to impressions to tie media spend to outcomes. Supply-side targeted CTV campaigns have increased 500% since 2022.
OpenX, a supply-side platform, has launched OpenX IQ, a suite of AI and machine learning capabilities designed to improve media buying quality and performance. The platform addresses growing demand for transparent AI in advertising, with 46% of advertisers planning to use AI for media strategy whilst 35% of marketers cite concerns over AI decision-making transparency. OpenX IQ integrates high-fidelity supply-side signals into media workflows through features including inventory quality scoring, audience modelling, attention and engagement modelling, and performance optimisation. The capabilities are accessible through OpenXSelect and OpenXBuild platforms. Ranked among the largest SSPs globally for direct publisher partnerships by Jounce, OpenX aims to provide buyers with verifiable quality controls and customisable decisioning models across formats including CTV.
Chalice AI has partnered with OpenX to bring AI-powered curation to high-quality video inventory. The integration allows advertisers to deploy custom AI models and bidding agents directly within OpenXBuild, enabling real-time impression-level decisioning at the supply layer. The partnership addresses challenges in video advertising, where marketers struggle to balance quality environments with measurable outcomes amid signal loss and privacy changes. Chalice's AI models operate as always-on bidding agents within OpenX's cloud-native infrastructure, evaluating video impressions based on their likelihood to drive high-value actions. Early results from a Hyundai campaign demonstrated a 20% reduction in cost per high-value action and 67% decrease in CPMs compared to alternatives. The collaboration represents a shift from static curation to dynamic, outcome-based optimisation in premium video advertising.
OpenX, a supply-side platform, has unveiled a rebrand positioning itself as "The Intelligent SSP" with a new logo and visual identity. The company aims to simplify digital advertising by addressing industry complexity that has emerged over the past decade. OpenX introduced a streamlined product architecture comprising OpenXSelect, OpenXBuild, OpenXControl and OpenXExchange, built on three pillars: quality, performance and adaptability. The platform features direct publisher relationships, AI-powered curation and a proprietary supply-side identity graph delivering privacy-forward signals. As one of the largest SSPs globally, OpenX operates on fully cloud-based infrastructure designed to support AI-driven, agent-based buying across CTV, mobile and desktop formats. The rebrand reinforces the company's commitment to transparent supply paths and rigorous inventory standards.
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Industries
Company Size
501-1,000
Company Stage
Series E
Total Funding
$75.5M
Headquarters
Pasadena, CA
Founded
2007
Find jobs on Simplify and start your career today
Don't see your dream role? Check out thousands of other roles on Simplify.Browse all jobs