| Coachedbyawf Ltd | Education | 2025 |
| Coaching 4 Community Limited | Education | 2021 |
| Coai Ltd | Information & communication | 2025 |
| Coastal Property Management and Consulting Limited | Real estate | 2023 |
| Coasts for Life Ltd | Professional & scientific | 2015 |
| Cobb's Corner Cafe Ltd | Hospitality | 2017 |
| Cockney's of Bromley Limited | Hospitality | 2024 |
| Cocktail Akademia Ltd | Hospitality | 2023 |
| Coco Birth Box Ltd | Other services | 2024 |
| Code Fish Technologies Ltd | Extraterritorial | 2021 |
| Codeclick Limited | Information & communication | 2008 |
| Codelet Ltd | Information & communication | 2017 |
| Coderware Ltd | Information & communication | 2018 |
| Codit Ltd | Hospitality | 2026 |
| Coffee Alice Ltd | Hospitality | 2019 |
| Coffee Junction Limited | Wholesale & retail | 1998 |
| Coffeebest Limited | Manufacturing | 2015 |
| Coffeereps Ltd | Manufacturing | 2021 |
| Cogency - Research for Impact Ltd | Professional & scientific | 2015 |
| Cogito IT Ltd | Information & communication | 1994 |
| Coilglow Limited | Real estate | 1978 |
| Coldface Refrigeration Limited | Manufacturing | 2015 |
| College Green Court (Freehold) Limited | Households | 2019 |
| College of Public Speaking 2006 Limited | Education | 2021 |
| Collide Limited | Real estate | 2025 |
| Colliers Insulation Limited | Construction | 2022 |
| Collin Marian Consulting Limited | Information & communication | 2023 |
| Collingbourn Limited | Households | 1983 |
| Collingham Gardens Limited | Real estate | 2012 |
| Collins Alliance Ltd | Real estate | 2026 |
| Colloquit Consultancy Limited | Health & social care | 2012 |
| Columbia Close Management Company Limited | Households | 1979 |
| Columbium Ltd | Construction | 2024 |
| Combined Services Security Ltd | Administrative & support | 2012 |
| Comed Services Limited | Health & social care | 2019 |
| Comet Cleaners Limited | Other services | 2009 |
| Comfort & Cask Limited | Wholesale & retail | 2025 |
| Command Electrical Ltd | Construction | 2012 |
| Command Z Creative Limited | Information & communication | 2011 |
| Commaz Ltd | Wholesale & retail | 2021 |
| Commepound Limited | Information & communication | 2026 |
| Commercial Tradesmen Limited | Administrative & support | 2020 |
| Common Cents Business Solution Limited | Professional & scientific | 2010 |
| Common Cents Ltd | Professional & scientific | 2020 |
| Commonside Court RTM Company Limited | Households | 2023 |
| Comms NOW Limited | Extraterritorial | 2013 |
| Commserv Limited | Professional & scientific | 2024 |
| Commspark Limited | Construction | 2012 |
| Commsult Limited | Other services | 2007 |
| Communication for ALL, Speech and Language Therapy Limited | Education | 2025 |
| Community Links Bromley | Other services | 1995 |
| Commversion International Limited | Administrative & support | 2019 |
| Compact Cooling Limited | Energy | 2002 |
| Compact Interiors Limited | Manufacturing | 2014 |
| Compassion Cloud Limited | Information & communication | 2025 |
| Compassion House Ltd | Health & social care | 2026 |
| Complete Elevators Ltd | Professional & scientific | 2018 |
| Complete Pipeline's Limited | Construction | 2021 |
| Complete Private Builder Limited | Construction | 2015 |
| Complete Sash Windows (London) Limited | Construction | 2018 |
| Compliance Learning & Development Limited | Professional & scientific | 2023 |
| COMPLIANCEM8 Ltd | Information & communication | 2017 |
| Concrete Candy Ltd | Arts & recreation | 2009 |
| Concrete KIN Limited | Arts & recreation | 2019 |
| Conduit Consulting Limited | Professional & scientific | 2019 |
| Conell Services Limited | Administrative & support | 2020 |
| Conewood Manor Care Limited | Health & social care | 2014 |
| Conflate.Digital LLP | | 2022 |
| Coniston Court (Beckenham) Residentsassociation Limited | Households | 1962 |
| Connaught Mews SE18 Management Company Limited | Households | 1997 |
| Connect Chauffeurs Ltd | Transport & logistics | 2026 |
| Connect Home Automation Limited | Information & communication | 2020 |
| Connect Relationship & Psychosexual Therapy Ltd | Extraterritorial | 2021 |
| Conrad Chess Consultancy Ltd | Information & communication | 2024 |
| Conrad Court (Beckenham) Management Limited | Households | 1977 |
| Conrad Cross Ltd | Arts & recreation | 2025 |
| Conscious Bodhi Limited | Health & social care | 2025 |
| Conscious Entrepreneurship Ltd | Information & communication | 2019 |
| Consolidated Project Management Ltd | Construction | 2006 |
| Consolidated Property Management Limited | Real estate | 2016 |
| Constitution Hill Management Company Limited | Households | 2004 |
| Construct Your Life Ltd | Education | 2024 |
| Construction & Rail Consultants Limited | Professional & scientific | 2013 |
| Construction Consulting (London) Ltd | Professional & scientific | 2011 |
| Consult Sustainability Ltd | Professional & scientific | 2021 |
| Consultancy Contractor Services UK Limited | Information & communication | 2024 |
| Consulting Aces Limited | Information & communication | 2012 |
| Consulting Mediterraneo Ltd | Professional & scientific | 2020 |
| Content Monkey Limited | Professional & scientific | 2014 |
| Content Qualified Ltd | Professional & scientific | 2022 |
| Contiki (U.K.) Holdings Limited | Administrative & support | 1985 |
| Contiki Services Limited | Administrative & support | 1981 |
| Contiki Travel (U.K.) Limited | Administrative & support | 1977 |
| Contingent Works Ltd | Other services | 2018 |
| Contingent Works Services Ltd | Information & communication | 2020 |
| Contractor JAK Ltd | Construction | 2025 |
| Control Latino UK Ltd | Information & communication | 2024 |
| Controlicz Ltd | Information & communication | 2018 |
| Conversational Studios Limited | Information & communication | 2025 |
| Conyers Road Development Limited | Construction | 2025 |