| Cobleclean Ltd | Administrative & support | 2023 |
| Coco Nail Welling Ltd | Other services | 2024 |
| Cognitive Minds Ltd | Education | 2013 |
| Cole Lifts Ltd | Professional & scientific | 2025 |
| Collaboration Network Ltd | Other services | 2020 |
| Collingbourne Medical Limited | Health & social care | 2026 |
| Colour Superior Limited | Manufacturing | 2018 |
| Comfort Keys Limited | Real estate | 2026 |
| Comfort Richard Limited | Administrative & support | 2018 |
| Compare Card Processing Limited | Information & communication | 2017 |
| Complete Building and Home Improvements Limited | Construction | 2013 |
| Compliance Software Technology Limited | Information & communication | 2024 |
| Compliance View Ltd | Administrative & support | 2020 |
| Compoundify Ltd | Wholesale & retail | 2026 |
| Confident Holdings Ltd | Real estate | 2020 |
| Connectedmenu Limited | Information & communication | 2026 |
| Constrati Advisory & Build Limited | Professional & scientific | 2022 |
| Controlled Electrics Ltd | Construction | 2020 |
| Cooke Enterprise Ltd | Wholesale & retail | 2023 |
| Copyright Rescue International Limited | Other services | 1998 |
| Coremindsuk Ltd | Wholesale & retail | 2025 |
| Cosdec Alpha Ltd | Information & communication | 2022 |
| Countdown Coder Ltd | Information & communication | 2025 |
| CPD Validation Services Limited | Education | 2025 |
| Craftio Group Ltd | Information & communication | 2024 |
| Creamytee Luxury Strand Ltd | Other services | 2025 |
| Creative Deer Ltd | Professional & scientific | 2018 |
| Crescent Commercial Management Limited | Professional & scientific | 2021 |
| Cresta Advisors Limited | Professional & scientific | 2025 |
| Croak & Dagger Games Ltd | Information & communication | 2026 |
| Crosspath Cctv Ltd | Construction | 2015 |
| Crown Data Intelligence Ltd | Administrative & support | 2025 |
| Crowne Print Finishers Limited | Manufacturing | 2010 |
| Croydon School of Performing Arts CIC | Arts & recreation | 2026 |
| Cruffins Limited | Wholesale & retail | 2018 |
| Crush Productions Limited | Administrative & support | 2021 |
| Crystal Cleaning London Ltd | Real estate | 2020 |
| CRZ Investment Properties Limited | Real estate | 2024 |
| CTV M3DIA Ltd | Arts & recreation | 2024 |
| Cullerful Life Limited | Health & social care | 2021 |
| Curiesearch Labs Ltd | Professional & scientific | 2025 |
| Curious CFO Limited | Professional & scientific | 2023 |
| Curry Hall Ltd | Hospitality | 2024 |
| Cussens Electrical Services Ltd | Construction | 2008 |
| Custodia Limited | Administrative & support | 2012 |
| Cutty Sark International Ltd | Wholesale & retail | 2021 |
| Cypherinvest Ltd | Real estate | 2022 |
| Cyphersoft Limited | Information & communication | 2011 |
| Czns Dream Ltd | Wholesale & retail | 2026 |
| D C (UK) Limited | Construction | 1999 |
| D Pieed Limited | Wholesale & retail | 2024 |
| D Projects Ltd | Construction | 2017 |
| D Singh Construction Ltd | Construction | 2025 |
| D-Able Ltd | Construction | 2020 |
| D1B Ltd | Real estate | 2023 |
| D365 Labs Limited | Information & communication | 2023 |
| DA Infotech Ltd | Information & communication | 2025 |
| DA6 Holdings Ltd | Real estate | 2024 |
| DA6 Properties Ltd | Construction | 2021 |
| Daasom Limited | Transport & logistics | 2024 |
| Dadawideworld.Co.Uk Ltd | Wholesale & retail | 2026 |
| Dahal Care UK Ltd | Health & social care | 2021 |
| Daimon Mediation Ltd | Professional & scientific | 2015 |
| Daisy's Health and Beauty Ltd | Other services | 2025 |
| Dami Group Limited | Wholesale & retail | 2019 |
| Danaj Construction Ltd | Construction | 2017 |
| Danaj Homes Ltd | Real estate | 2024 |
| Dancrianga Ltd | Construction | 2024 |
| Dandu Enterprises Ltd | Real estate | 2006 |
| Danmar Delivery Ltd | Transport & logistics | 2018 |
| Dannails Ltd | Other services | 2021 |
| DAPHE2024 Ltd | Wholesale & retail | 2024 |
| Daria Concept Ltd | Construction | 2018 |
| Darkdan Ltd | Construction | 2015 |
| Dars 1512 Ltd | Financial services | 2025 |
| Dartiloci Limited | Real estate | 2025 |
| Darwin Electrical Maintenance Limited | Manufacturing | 2009 |
| Dave Gordon Limited | Construction | 2013 |
| Davio Ltd | Construction | 2026 |
| Davitro Ltd | Wholesale & retail | 2023 |
| Dawn Star Productions (London) Ltd. | Professional & scientific | 2017 |
| Daxab Ltd | Professional & scientific | 2013 |
| DB Bexley Ltd | Education | 2018 |
| DB Contract Services Ltd | Construction | 2026 |
| DB Salons Limited | Other services | 2012 |
| Dbclshed Ltd | Other services | 2025 |
| Dd-Tek Ltd | Information & communication | 2018 |
| DDB Solutions Limited | Real estate | 2011 |
| Ddeel Limited | Health & social care | 2014 |
| DDK Group Ltd | Manufacturing | 2025 |
| DE Vigil Limited | Administrative & support | 2014 |
| Deadsheepgolf Ltd | Arts & recreation | 2025 |
| Decho Travel Limited | Administrative & support | 2021 |
| DEE Blossom Enterprise Ltd | Health & social care | 2018 |
| DEE Licious Fish Ltd | Hospitality | 2025 |
| Define & Sculpt Limited | Other services | 2025 |
| Della Alarm Systems Ltd | Public administration | 2025 |
| Dellys Couture Limited | Manufacturing | 2019 |
| Delta Sierra Echo Limited | Information & communication | 2023 |
| Delta Technologies Ltd | Information & communication | 2024 |