AgenticOS provides a system-level layer that allows agents to plan, transact, and optimise programmatic advertising with speed, consistency, and control. PubMatic is launching AgenticOS in close partnership with a group of forward-leaning advertisers, agencies, and publishers actively engaged in testing, shaping, and deploying agent-led workflows, providing real-world validation and innovation for the next phase of AI-native advertising. Advertising is compounding across new devices and formats, hundreds of thousands of new entrant advertisers, and billions of global users, placing increasing pressure on legacy programmatic systems.