| Croydon Crest Property Services Ltd | Real estate | 2015 |
| Croydon DIY Ltd | Wholesale & retail | 2023 |
| Croydon Drinks Cash and Carry Limited | Extraterritorial | 2023 |
| Croydon Ductwork Limited | Construction | 1989 |
| Croydon Enterprise Agency Ltd | Administrative & support | 2007 |
| Croydon Enterprise Loan Fund Limited | Financial services | 2007 |
| Croydon Express Limited | Wholesale & retail | 2026 |
| Croydon FM C.I.C. | Information & communication | 2018 |
| Croydon Food Centre Limited | Wholesale & retail | 2024 |
| Croydon Food House Ltd | Hospitality | 2018 |
| Croydon Foods Ltd | Hospitality | 2021 |
| Croydon Frame Express Ltd | Manufacturing | 2017 |
| Croydon Fresh Fish & Meat Ltd | Wholesale & retail | 2021 |
| Croydon Fulani Cultural Centre C.I.C. | Education | 2024 |
| Croydon Holdings Limited | Financial services | 2017 |
| Croydon Hotels Limited | Hospitality | 2010 |
| Croydon House (Commercial) Ltd | Real estate | 2015 |
| Croydon House (Residential) Ltd | Real estate | 2015 |
| Croydon House Ltd | Real estate | 2014 |
| Croydon Hybrid Parts Ltd | Wholesale & retail | 2022 |
| Croydon Indians Group Limited | Arts & recreation | 2016 |
| Croydon International Film Festival Ltd | Administrative & support | 2024 |
| Croydon Kebab Centre Ltd | Hospitality | 2020 |
| Croydon Landscaping Ltd | Administrative & support | 2025 |
| Croydon Logistics Surrey Ltd | Transport & logistics | 2022 |
| Croydon Makers & Creators CIC | Other services | 2025 |
| Croydon Market Fishmongers Ltd | Wholesale & retail | 2019 |
| Croydon Mencap | Health & social care | 1998 |
| Croydon Mixed Martial Arts Academy CIC | Education | 2024 |
| Croydon MOT Hub Limited | Wholesale & retail | 2026 |
| Croydon Neighbourhood Care Association | Other services | 2000 |
| Croydon Optical Ltd | Wholesale & retail | 2025 |
| Croydon Orchard Limited | Hospitality | 2018 |
| Croydon Outlet Trading Ltd | Wholesale & retail | 2019 |
| Croydon Oystercard Ltd | Transport & logistics | 2015 |
| Croydon Property Services Ltd | Real estate | 2011 |
| Croydon Quality Fish Ltd | Manufacturing | 2018 |
| Croydon Refugee Community | Other services | 2019 |
| Croydon Salon Ltd | Other services | 2015 |
| Croydon Sellers Ltd | Wholesale & retail | 2020 |
| Croydon Shawarma Ltd | Hospitality | 2019 |
| Croydon Supplementary Education Project (Csep) | Education | 2012 |
| Croydon Tax Centre Limited | Professional & scientific | 2019 |
| Croydon Tech City Limited | Administrative & support | 2014 |
| Croydon TH Commercial Ltd | Administrative & support | 2019 |
| Croydon TH Ltd | Administrative & support | 2019 |
| Croydon Therapy Rooms Limited | Other services | 2019 |
| Croydon Town Centre BID Limited | Other services | 2007 |
| Croydon Trading Limited | Hospitality | 2020 |
| Croydon Tutorial College Community Interest Company | Education | 2021 |
| Croydon Tyre Centre Ltd | Wholesale & retail | 2025 |
| Croydon Used Car Parts Limited | Wholesale & retail | 2018 |
| Croydon Vape Centre Limited | Wholesale & retail | 2025 |
| Croydon Vape Ltd | Wholesale & retail | 2025 |
| Croydon Vapes 35 Ltd | Wholesale & retail | 2026 |
| Croydon Vehicle Autocentre Ltd | Wholesale & retail | 2026 |
| Croydon Vision Care Ltd | Wholesale & retail | 2017 |
| Croydon Voluntary Action | Health & social care | 1996 |
| Croydon Wholesale Furniture Ltd | Wholesale & retail | 2022 |
| Croydon Wine Bars Limited | | 1977 |
| Croydon With Talent Ltd | Education | 2015 |
| Croydon Youth Zone | Arts & recreation | 2016 |
| Croydonist CIC | Information & communication | 2020 |
| Croydonites Festival of New Theatre CIC | Arts & recreation | 2015 |
| Croydonsam Training Ltd | Education | 2011 |
| Croyquant Services Limited | Administrative & support | 1975 |
| Croyx Legal Consultancy Limited | Professional & scientific | 2003 |
| Crrash Auto Limited | Wholesale & retail | 2015 |
| Crunchinfinity Limited | Information & communication | 2004 |
| Crvv Solutions Limited | Transport & logistics | 2025 |
| CRW Electrical Solutions Ltd. | Energy | 2015 |
| Cryptactic Limited | Information & communication | 2018 |
| Crystal Agency Ltd | Administrative & support | 2019 |
| Crystal Bench Ltd | Professional & scientific | 2021 |
| Crystal Capital Consultancy Ltd | Information & communication | 2026 |
| Crystal Capital Consultants Limited | Real estate | 2026 |
| Crystal Clear Commercial Services Limited | Administrative & support | 2023 |
| Crystal Compliance Water Ltd | Professional & scientific | 2018 |
| Crystal Consulting (Airports) Ltd | Professional & scientific | 2011 |
| Crystal Damp Proofing & Basements Ltd | Construction | 2021 |
| Crystal High-Tech Ltd | Wholesale & retail | 2016 |
| Crystal Palace Gymnastics Limited | Arts & recreation | 2012 |
| Crystal Platforms Ltd | Wholesale & retail | 2025 |
| Crystal Recruitment Ltd | Administrative & support | 2021 |
| Crystaldesign Limited | Wholesale & retail | 2000 |
| Crystalfere Enterprises Limited | Other services | 2023 |
| Crystalwood Consultancy Limited | Construction | 2016 |
| CS Futures Ltd | Financial services | 2003 |
| Csatrina Holdings Ltd | Manufacturing | 2017 |
| CSD UK Ventures Ltd | Financial services | 2024 |
| CSL by Design Limited | Professional & scientific | 2013 |
| CSL Law Limited | Professional & scientific | 2013 |
| CSX Ltd | Information & communication | 2023 |
| CTB Property Estates Ltd | Real estate | 2021 |
| CTB Support Services Ltd | Real estate | 2025 |
| CTC Payroll Limited | Administrative & support | 2022 |
| CTG Advisory Limited | Professional & scientific | 2025 |
| CTI Expo Ltd | Construction | 2013 |
| CTK Residential Care Homes 2 Ltd | Health & social care | 2011 |
| Ctmp Accountants Ltd | Professional & scientific | 2013 |