| CPW Property Maintenance Limited | Construction | 2008 |
| Crafty Endeavours Limited | Wholesale & retail | 2021 |
| Craigwdecorating Limited | Construction | 2024 |
| CRB Berkshire Ltd | Wholesale & retail | 2015 |
| CRE8HEIR Ltd | Other services | 2014 |
| Creative HUG Limited | Professional & scientific | 2016 |
| Creative Little Footsteps Limited | Education | 2014 |
| Creative MB Limited | Professional & scientific | 2024 |
| Creighton-Ward Luxury Cars Ltd | Administrative & support | 2002 |
| Crest Roofing Limited | Construction | 1990 |
| Crewe & Co Estates Ltd | Real estate | 2025 |
| Cristian Vicol Limited | Construction | 2017 |
| Croft Electric Ltd | Construction | 2012 |
| Croitor Ltd | Construction | 2014 |
| Cronus Holdings Limited | Financial services | 2026 |
| Crossfit Bracknell Ltd | Arts & recreation | 2020 |
| Crown & Casa Living Limited | Real estate | 2025 |
| Crown Corner Management Company Limited | Households | 2018 |
| Crown DC Services Limited | Professional & scientific | 2009 |
| Crown Decorating Ltd | Construction | 2022 |
| Crown Dental Staff Limited | Administrative & support | 2015 |
| Crown Haven Homes Ltd | Real estate | 2025 |
| Crown Roofing (Centres) Limited | Construction | 1993 |
| Crown Technology Solutions Ltd | Administrative & support | 2025 |
| Crownshield Developments Ltd | Real estate | 2023 |
| Crownstone Property Group Ltd | Real estate | 2025 |
| Crownwood Holdings Ltd | Financial services | 2026 |
| Crownwood Real Estates Ltd | Real estate | 2026 |
| CRS Business Solutions Ltd | Professional & scientific | 2013 |
| Cryptic Cabin Ltd | Wholesale & retail | 2022 |
| Crystal Cleaners Great Holland Ltd | Other services | 2025 |
| Crystal Exteriors Limited | Administrative & support | 2026 |
| Crystle Clean Limited | Administrative & support | 2024 |
| CSN Ingredients Ltd | Wholesale & retail | 2026 |
| CSS IT Solutions Ltd | Information & communication | 2016 |
| CTH Engineering Limited | Manufacturing | 2012 |
| Cubic Partners Limited | Professional & scientific | 2009 |
| Culture IS Digital Ltd | Professional & scientific | 2024 |
| Curtland Limited | Real estate | 2018 |
| Curve Workplaces Limited | Construction | 2006 |
| Curvee Ltd | Wholesale & retail | 2024 |
| Cus-Com Ltd | Transport & logistics | 2015 |
| Custom Made Building Limited | Construction | 2019 |
| Cutandjacked Limited | Health & social care | 2011 |
| CW Leasing Ltd | Wholesale & retail | 2013 |
| CWF Tech Limited | Construction | 2015 |
| Cyberdoq Digital Ltd | Information & communication | 2025 |
| Cyberdoq Ltd | Financial services | 2026 |
| Cyberprotect Solution Ltd | Information & communication | 2025 |
| Cypher Consult Ltd | Information & communication | 2025 |
| D & D Driveways and Resurfacing Limited | Construction | 2019 |
| D & D Landscaping and Fencing Limited | Administrative & support | 2019 |
| D & G Wheeler Limited | Construction | 2003 |
| D E C Commercial Ltd | Other services | 2021 |
| D M Roofing Services Limited | Construction | 2023 |
| D&B Stone Worktops Ltd | Construction | 2024 |
| D&G Accommodation Limited | Real estate | 2025 |
| D&Jcatering Ltd | Hospitality | 2026 |
| D.A Electronic Consultancy Ltd | Information & communication | 2020 |
| D.A.R Property Investments Ltd | Real estate | 2023 |
| D.I.M Construction Solutions Limited | Construction | 2026 |
| D2X Limited | Information & communication | 2002 |
| DA Capo Music Ltd | Arts & recreation | 2019 |
| Dabdah Holdings Limited | Administrative & support | 2018 |
| Dachi's Restaurant to YOU Ltd | Hospitality | 2014 |
| Dacica Ltd | Administrative & support | 2023 |
| Daddy Medcal Services Limited | Health & social care | 2017 |
| Dado MK Ltd | Wholesale & retail | 2023 |
| Daler-Rowney Limited | Manufacturing | 1923 |
| Dalmatian Group Ltd | Information & communication | 2023 |
| Dalvi Wealth Management Limited | Financial services | 2016 |
| Damara Health Care Ltd | Administrative & support | 2025 |
| Damiano Consulting Ltd | Professional & scientific | 2018 |
| DAN Division-Uk Ltd | Wholesale & retail | 2019 |
| DAN Mills Plumbing & Heating Ltd | Construction | 2022 |
| Dan's Plans Ltd | Wholesale & retail | 2025 |
| Dance Decor Ltd | Construction | 2025 |
| Dancenergy Limited | Arts & recreation | 2022 |
| Dancexite Community Interest Company | Education | 2015 |
| Dandelion Day Nursery Limited | Health & social care | 2024 |
| Dani Harmer Academy Ltd | Arts & recreation | 2013 |
| Daniel Baxter Ltd | Households | 2024 |
| Daniel James Construction Services Limited | Water & waste | 2019 |
| Daniel RM Ltd | Transport & logistics | 2020 |
| Danjoli Capital - Property Investments Ltd | Financial services | 2022 |
| Dannybrid Limited | Administrative & support | 2019 |
| Dantech Services Ltd | Manufacturing | 2026 |
| Daphne’S Dining Ltd | Hospitality | 2021 |
| DAR Alma Ltd | Wholesale & retail | 2026 |
| Darby Literary Rights Agency Ltd | Information & communication | 2024 |
| Databird IT Solutions Limited | Information & communication | 2015 |
| Dataphoenix Ltd | Information & communication | 2020 |
| Datarole Consultancy Limited | Information & communication | 1995 |
| Datatate Ltd | Information & communication | 2017 |
| Datatech Innovations Ltd | Information & communication | 2024 |
| Datatrust Services Limited | Information & communication | 2020 |
| Dato Consulting Ltd | Administrative & support | 2019 |
| Daughter of the Soil Limited | Wholesale & retail | 2015 |
| Dave Higgs Trading Limited | Extraterritorial | 2016 |
| Dave Painter Building Consultancy Ltd | Professional & scientific | 2025 |