{"name":"MERCURY SECURITY SYSTEMS LTD","company_number":"03482926","status":"Active","type":"Private Limited Company","incorporated":"1997-12-18","dissolved":null,"registered_office":"9 Bridgegate Centre, Martinfield, Welwyn Garden City, Hertfordshire, AL7 1JG","postcode":"AL7 1JG","sic_codes":[{"code":25120,"description":"Manufacture of doors and windows of metal"},{"code":43210,"description":"Electrical installation"},{"code":80200,"description":"Security systems service activities"},{"code":84250,"description":"Fire service activities"}],"principal_activity":null,"previous_names":[],"warnings":[],"accounts":{"category":"Total Exemption Full","year_end":"30 September","last_made_up_to":"2025-09-30","next_due":"2027-06-30"},"employees":{"count":30,"accounts_date":"2025-09-30"},"financials":[{"financial_date":"2025-09-30","net_assets":72521,"cash":40311,"average_employees":30},{"financial_date":"2024-09-30","net_assets":11564,"cash":46107,"average_employees":36},{"financial_date":"2023-09-30","net_assets":11919,"cash":191},{"financial_date":"2022-09-30","net_assets":10681,"cash":279},{"financial_date":"2021-09-30","net_assets":4594,"cash":582}],"officers":{"current":2,"resigned":4,"complete":true,"note":"Names and details of individual officers are on the People page (subscriber-only on this site) and free at Companies House."},"charges":{"total":0,"outstanding":0},"gazette_notices":[],"insolvency_outcome":null,"ai_summary":null,"website":"https://mercurysystems.co.uk/","links":{"page":"https://www.companiesintheuk.co.uk/ltd/mercury-security-systems","people":"https://www.companiesintheuk.co.uk/company/mercury-security-systems/people","filing_history":"https://www.companiesintheuk.co.uk/company/mercury-security-systems/filing-history","companies_house":"https://find-and-update.company-information.service.gov.uk/company/03482926","financials":"https://www.companiesintheuk.co.uk/company/mercury-security-systems/financial","control":"https://www.companiesintheuk.co.uk/company/mercury-security-systems/control","charges":"https://www.companiesintheuk.co.uk/company/mercury-security-systems/charges"},"source":"CompaniesInTheUK, from Companies House, The Gazette and other public registers (see /support/about). Cite as: CompaniesInTheUK, https://www.companiesintheuk.co.uk/ltd/mercury-security-systems"}