Second perimeter: category position in AI responses. Build through: industry-specific tier-1/2 corroboration, category-defining content (methodologies, frameworks, case studies), sustained domain attribution rate. Test with category queries (“Who are the leading [industry] firms?”). Target: ≥75% inclusion rate. More competitive than identity — multiple firms compete for same domain. Requires deeper corroboration than identity sovereignty. Measure through domain-specific retrieval preference testing. Maintain through quarterly corroboration campaigns in industry sources.