| Cumin Lounge Limited | Hospitality | 2013 |
| Cumulus Business Solutions Ltd | Information & communication | 2018 |
| Cunliffe Buck Holdings Limited | Extraterritorial | 2013 |
| Cunliffe Building Services Limited | Construction | 2007 |
| Cupboard Games Limited | Information & communication | 2015 |
| Cupel Landholdings Ltd | Real estate | 2005 |
| Cupel Solutions Limited | Information & communication | 2001 |
| Cura Wellness Clinic Ltd | Other services | 2022 |
| Curaco Ltd | Education | 2025 |
| Curate IT Travel Limited | Administrative & support | 2023 |
| Curatile Limited | Manufacturing | 2025 |
| Curator Technologies Limited | Information & communication | 2016 |
| Curatorspace Limited | Information & communication | 2015 |
| Curbar Project Investments Limited | Administrative & support | 2019 |
| Curiomart NFT Ltd | Information & communication | 2025 |
| Curiosity Allotment Limited | Construction | 2019 |
| Curious Edge Limited | Professional & scientific | 2022 |
| Curious Events Ltd | Hospitality | 2026 |
| Curious Libations Limited | Wholesale & retail | 2019 |
| Curious Planets Ltd | Wholesale & retail | 2023 |
| Curious Yellow Events Ltd | Arts & recreation | 2022 |
| Curl Power Ltd | Other services | 2021 |
| Curls Inc. Limited | Wholesale & retail | 2022 |
| Curlyben Limited | Information & communication | 2013 |
| Curlyjazz Ltd | Professional & scientific | 2024 |
| Curo Developments Limited | Real estate | 2013 |
| Curo Fulfilment Limited | Transport & logistics | 2021 |
| Currach Consulting Limited | Professional & scientific | 2012 |
| Currack Limited | Information & communication | 2000 |
| Currencywave Ltd | Financial services | 2008 |
| Current Connections Electrical Limited | Construction | 2026 |
| Currently Hair Ltd | Other services | 2018 |
| Currie Medical Services Limited | Health & social care | 2018 |
| Curry & Co Ltd | Hospitality | 2024 |
| Curry and Crown Limited | Hospitality | 2024 |
| Curry Kitchen Ltd | Hospitality | 2017 |
| Curry Leaf Mobile Ltd | Hospitality | 2025 |
| Curryz House Ltd | Hospitality | 2022 |
| Curtain UP Productions Ltd | Arts & recreation | 2024 |
| Curtis Cleaning Services Ltd | Administrative & support | 2016 |
| Curtis Furniture Holdings Limited | Financial services | 2019 |
| Curtis Furniture Limited | Manufacturing | 1997 |
| Curtis Lawns & Gardens Ltd | Administrative & support | 2018 |
| Curveblock Ltd | Information & communication | 2018 |
| Curveblock Real Estate General Partner Ltd | Professional & scientific | 2022 |
| Curveblock Services Ltd | Professional & scientific | 2022 |
| Curveblock Technologies Ltd | Professional & scientific | 2021 |
| Curved Growth Limited | Construction | 2002 |
| Curwen Bank Management Company Limited | Households | 2007 |
| Custard Software Ltd. | Information & communication | 2015 |
| Custodial Holdings (PA) Limited | Administrative & support | 2017 |
| Custodian Healthcare Ltd | Health & social care | 2023 |
| Custom Accounting Limited | Professional & scientific | 2026 |
| Custom Air Fresheners Limited | Manufacturing | 2021 |
| Custom Cabinetry Ltd | Manufacturing | 2021 |
| Custom Engineering Services Ltd | Professional & scientific | 2020 |
| Custom Fittings Limited | Manufacturing | 1981 |
| Custom Plant Engineering & Design Ltd | Professional & scientific | 2026 |
| Custom Print Leeds Ltd | Manufacturing | 2021 |
| Custom Securities Limited | Professional & scientific | 1999 |
| Custom Stitch Ltd | Wholesale & retail | 2018 |
| Customer Experience Live Ltd | Professional & scientific | 2021 |
| Customer Services UK Numbers Limited | Information & communication | 2015 |
| Customerist Ltd | Professional & scientific | 2025 |
| CUT 'N' Edge Garden Services Ltd | Administrative & support | 2023 |
| CUT Above Gents Hairstylist Ltd | Wholesale & retail | 2012 |
| CUT and Edge Ltd | Manufacturing | 2023 |
| Cute Electrical Supplies Ltd | Transport & logistics | 2008 |
| Cutexkiss Ltd | Information & communication | 2022 |
| Cutie POP Limited | Wholesale & retail | 2017 |
| Cutler & Co Limited | Professional & scientific | 2011 |
| Cuts by Hash Limited | Other services | 2026 |
| Cutsbysamad Ltd | Other services | 2024 |
| Cutsmith Limited | Other services | 2019 |
| Cuttin' Room Limited | Other services | 2017 |
| Cutting Technologies Holdings Limited | Financial services | 2024 |
| Cutts Motor Services Limited | Manufacturing | 2010 |
| Cutz by Shibzz Ltd | Other services | 2024 |
| CUX Culinary Company Ltd | Hospitality | 2013 |
| CV Compliance Ltd | Professional & scientific | 2025 |
| CV Logistics Limited | Construction | 2024 |
| CV Muscle Ltd | Administrative & support | 2015 |
| CV Stairlifts Ltd | Wholesale & retail | 2026 |
| CV Support Services Limited | Construction | 2014 |
| CVM Trans Ltd | Transport & logistics | 2025 |
| Cvtronics Ltd | Wholesale & retail | 2021 |
| CW Aromas Ltd | Wholesale & retail | 2021 |
| CW Assessments Limited | Construction | 2016 |
| CW Motorhomes Ltd | Wholesale & retail | 2025 |
| CW Projects (Integrated Services) Ltd | Construction | 2015 |
| CW Projects Limited | Construction | 2019 |
| CW Properties (Leeds) Holdings Limited | Financial services | 2024 |
| CW Properties (Leeds) LLP | | 2006 |
| CW Sprayers Limited | Professional & scientific | 2024 |
| CWC Leisure Ltd | Other services | 2014 |
| CWH Accountancy Services Limited | Professional & scientific | 2024 |
| CWI Trading Limited | Wholesale & retail | 2021 |
| CWM Investment Management Limited | Financial services | 2016 |
| Cwmpas Consulting Limited | Education | 1999 |
| CWP (Leeds) Limited | Financial services | 2024 |