Gradial, a Seattle-based startup deploying AI agents to automate enterprise marketing workflows, has raised $65 million in Series C funding, CEO Doug Tallmadge exclusively tells Axios. Insight Partners led the Series C, which values Gradial at $675 million, with participation from existing investors VMG Partners, Madrona and Pruven; the company has raised more than $120 million in total. Gradial is building an operating system for marketing where AI agents can execute work across tools such as Adobe, Salesforce, ServiceNow and Databricks, identifying where brands are missing from AI-generated answers and drafting updates through approval processes. Clients include AWS, Prudential, T-Mobile, Vanguard, Kaiser Permanente and U.S. Bank, with T-Mobile cutting its execution time for marketing campaigns by 80%–90% with an accuracy rate of 99%. Tallmadge and his three co-founders met at Dartmouth and launched Gradial in 2023 shortly after the debut of ChatGPT. Gradial plans to use the new funding to grow its 100-person company, hiring across engineering, sales and marketing.