CHALLAIN LIMITED is an active UK overseas entity, incorporated on 15 February 2023 at Companies House (number OE026528; OpenRegistry canonical ID GB-OE026528-challain-limited). Sophymarine's OpenRegistry indexes it as one of 7,202 active companies registered in St. Helier (postcode JE2). Programmatic access via MCP at https://openregistry.sophymarine.com/mcp.