| Curiosity Services Limited | Health & social care | 2022 |
| Curious Crafty CIC | Arts & recreation | 2019 |
| Curious EAR CIC | Arts & recreation | 2023 |
| Curious Jackalope Limited | Manufacturing | 2022 |
| Curious PR and Events (Cheltenham) Ltd | Health & social care | 2019 |
| Curis Tech Services Ltd | Administrative & support | 2013 |
| Curly Cars Ltd | Wholesale & retail | 2023 |
| Curly Locks Ltd | Other services | 2009 |
| Curlyviva Ltd | Other services | 2025 |
| Curo Blackpool Limited | Health & social care | 2014 |
| Curran Brothers Electrical Ltd | Construction | 2020 |
| Curran Construction Services Ltd | Construction | 2017 |
| Curran Contracting Services Ltd | Construction | 2024 |
| Curran Investments Limited | Professional & scientific | 2022 |
| Current Electrical Systems Ltd | Construction | 2025 |
| Currentis Global Limited | Wholesale & retail | 2026 |
| Curricular Tuition Ltd | Education | 2015 |
| Currie Ltd | Arts & recreation | 2022 |
| Curried Away Limited | Hospitality | 2018 |
| Currock Avenue Limited | Construction | 2020 |
| Curry and Cream Ltd | Hospitality | 2025 |
| Curry Atherton Limited | Hospitality | 2017 |
| Curry Centre (Bolton) Ltd | Hospitality | 2023 |
| Curry Cottage Sussex Ltd | Hospitality | 2020 |
| Curry Express Limited | Hospitality | 2025 |
| Curry Food Ltd | Hospitality | 2019 |
| Curry for YOU Ltd | Hospitality | 2024 |
| Curry House Kerala Ltd | Hospitality | 2025 |
| Curry Lounge Swinton Limited | Hospitality | 2024 |
| Curry POT PVT Ltd | Hospitality | 2025 |
| Curry Trap Ltd | Hospitality | 2025 |
| Curry's House Ltd | Hospitality | 2026 |
| Curryosity Indian Kitchen Ltd | Hospitality | 2024 |
| Currys Elevator Holding (UK) Ltd | Manufacturing | 2022 |
| Curt Lamberth Ltd | Wholesale & retail | 2025 |
| Curtain Clearance Warehouse Limited | Wholesale & retail | 1995 |
| Curtis Maxwell Limited | Other services | 2021 |
| Curtis Pearson Ltd | Administrative & support | 2025 |
| Curtis Shaw Limited | Administrative & support | 2002 |
| Curvalux UK Limited | Manufacturing | 2019 |
| Curve Retail Ltd | Extraterritorial | 2022 |
| Curvebyklb Ltd | Wholesale & retail | 2023 |
| Curved Hall Limited | Professional & scientific | 2009 |
| Curves Design Limited | Wholesale & retail | 2017 |
| Curzon Avenue Ltd | Real estate | 2019 |
| Curzon Oral Health Limited | Health & social care | 2024 |
| Curzon Place Management Company Limited | Real estate | 2002 |
| Curzon Tech & Consulting Ltd | Information & communication | 2025 |
| Cushy Creations Limited | Wholesale & retail | 2025 |
| Cuss Contractors Limited | Professional & scientific | 1962 |
| Cussons Estates Ltd | Real estate | 2005 |
| Custodia IP Holdings Ltd | Administrative & support | 2025 |
| Custodia Technology Group Limited | Information & communication | 2021 |
| Custodia Technology Limited | Information & communication | 2017 |
| Custodian Security Ltd | Administrative & support | 2025 |
| Custom Automotive Tech Ltd | Wholesale & retail | 2025 |
| Custom Bifolds Ltd | Manufacturing | 2021 |
| Custom Built Homes (North West) Ltd | Construction | 2013 |
| Custom Cars Limited | Wholesale & retail | 2016 |
| Custom Design & Projects Ltd | Manufacturing | 2014 |
| Custom Funky Ltd | Wholesale & retail | 2025 |
| Custom Glass Manchester Ltd | Construction | 2026 |
| Custom Gym Interiors Limited | Construction | 2025 |
| Custom LED Neon Ltd | Manufacturing | 2023 |
| Custom Made Projects Ltd | Manufacturing | 2020 |
| Custom Process Engineers Ltd | Professional & scientific | 2007 |
| Custom Teamwear Limited | Wholesale & retail | 2017 |
| Custom Wood Creations Limited | Manufacturing | 2024 |
| Customer Insight Limited | Professional & scientific | 2001 |
| Customform Limited | Transport & logistics | 1991 |
| Customfront Property Management Limited | Administrative & support | 1992 |
| Customifeel Ltd | Administrative & support | 2023 |
| Customised Packaging Limited | Administrative & support | 2004 |
| Customono Company for Food Meals Ltd | Wholesale & retail | 2026 |
| Customs & Clowes Limited | Professional & scientific | 2025 |
| Customs Connect Digital Limited | Information & communication | 2018 |
| Customs Connect Digital Solutions Limited | Information & communication | 2018 |
| Customs Connect Europe Limited | Professional & scientific | 2016 |
| Customs Connect Group Limited | Financial services | 2015 |
| Customs Connect Limited | Professional & scientific | 2009 |
| Customtrade T/As Nouveau Jewellers Ltd | Wholesale & retail | 1992 |
| CUT a Drink Ltd | Wholesale & retail | 2025 |
| CUT Labz Ltd | Other services | 2024 |
| CUT NO Corners Joinery Limited | Construction | 2025 |
| Cut&Thread Ltd | Wholesale & retail | 2025 |
| Cute Bird Ltd | Wholesale & retail | 2025 |
| Cute Cubs Ltd | Health & social care | 2025 |
| Cute D&C Pet Food Ltd | Manufacturing | 2020 |
| Cuteehk Limited | Hospitality | 2026 |
| Cuteesclothing Ltd | Wholesale & retail | 2026 |
| Cuteilities Limited | Information & communication | 2026 |
| Cuteness Children Fashion Limited | Wholesale & retail | 2019 |
| Cuthbert & Stafford Hulme Limited | Professional & scientific | 2008 |
| Cutisadvance Ltd | Professional & scientific | 2006 |
| Cutlass Communications Limited | Professional & scientific | 2012 |
| Cutlers View Management Company Limited | Real estate | 2013 |
| Cutting Etch Designs Ltd | Manufacturing | 2026 |
| Cutting Lounge Swinton Limited | Other services | 2021 |
| Cutz 24/7 Ltd | Other services | 2023 |
| Cutz Co Ltd | Other services | 2023 |