Profound, officially Cooper Square Technologies Inc., raised a $180M Series D at a $1.8 billion valuation on September 15, 2026, marking a follow-on late-stage round jointly led by Sequoia Capital and Kleiner Perkins. The round included Lightspeed Venture Partners, Khosla Ventures, Saga Ventures, Evantic and South Park Commons; the article did not disclose specific revenue, client count, pipeline or employee metrics beyond the valuation. The marketing technology startup plans to use the funding to expand its platform that helps brands boost visibility in AI services like ChatGPT by identifying buyer prompts, optimizing content for chatbot citations, and tracking product accuracy, consumer sentiment and competitor mentions.