CALLIDUSOS LIMITED is an active UK private limited company, incorporated on 10 December 2025 at Companies House (number 16902276; OpenRegistry canonical ID GB-16902276-callidusos-limited). Sophymarine's OpenRegistry classifies it under SIC 62012 (Business and domestic software development), one of 91,186 active UK entities in that code and one of 4,672 active companies registered in Newark, Nottinghamshire (postcode NG22). Programmatic access via MCP at https://openregistry.sophymarine.com/mcp.