Stacker, the first content distribution platform built for earned reach, announced the launch of GEO Reporting, a new feature embedded directly in the Stacker portal that tracks how distributed stories perform across AI search platforms. The feature tracks story-level and aggregated performance across six AI platforms: ChatGPT, Perplexity, Google AI Overviews, Google AI Mode, Gemini, and Claude. Each story is tracked across 30 prompts over four weeks post-syndication, surfacing response presence, citation rates, and how Stacker's network of 3,500+ vetted publishers amplifies a brand's visibility. The launch also includes the GEO Analytics dashboard and Competitive GEO Reporting, which tracks share of voice and citation share against competitors. "Brands have been asking how to measure the actual impact of earned distribution on their visibility in AI search," said Noah Greenberg, CEO of Stacker. "GEO Reporting gives them that answer, story by story."