| Curry 2 Night Limited | Hospitality | 2012 |
| Curry Corner (Leic) Ltd | Hospitality | 2024 |
| Curry HUT Delights Ltd | Hospitality | 2024 |
| Curry on Cocktails Lounge Limited | Hospitality | 2023 |
| Curry Palace Syston Limited | Hospitality | 2021 |
| Curtis and Wakeling Limited | Construction | 2022 |
| Curtis BTL Property Limited | Real estate | 2025 |
| Curtis Electrical Services Limited | Construction | 2017 |
| Curtis Projects and Consulting Limited | Professional & scientific | 2025 |
| Curve Productions Limited | Arts & recreation | 2014 |
| CURVES4EVER Limited | Manufacturing | 2020 |
| Curvomatic Limited | Wholesale & retail | 2012 |
| Curvynchic Limited | Wholesale & retail | 2020 |
| Cushing IP and Co Limited | Professional & scientific | 2016 |
| Cusp Holdings Limited | Real estate | 2025 |
| Custodian (Inland RCF) Limited Partnership | | 2020 |
| Custodian Capital (101) Limited Partnership | | 2012 |
| Custodian Capital (102) Limited Partnership | | 2011 |
| Custodian Capital (103) Limited Partnership | | 2011 |
| Custodian Capital (104) Limited Partnership | | 2011 |
| Custodian Capital (105) Limited Partnership | | 2011 |
| Custodian Capital (106) Limited Partnership | | 2012 |
| Custodian Capital (107) Limited Partnership | | 2012 |
| Custodian Capital (108) Limited Partnership | | 2012 |
| Custodian Capital Limited | Real estate | 2008 |
| Custodian Property Income Reit PLC | Financial services | 2014 |
| Custodian Real Estate Light Industrial LP | | 2011 |
| Custodian Reit Limited | Extraterritorial | 2014 |
| Custom Heating & Electrics Ltd | Construction | 2022 |
| Custom Junkies Ltd | Manufacturing | 2024 |
| Custom Maid Limited | Administrative & support | 2014 |
| Custom Mortgage Solutions Limited | Administrative & support | 2010 |
| Custom Wood Works Ltd | Construction | 2020 |
| Custom X Builds Ltd | Information & communication | 2025 |
| Custom-Eyes (Midlands) Ltd | Health & social care | 2021 |
| Customizeco Ltd | Wholesale & retail | 2024 |
| CUT & Run Limited | Arts & recreation | 1997 |
| CUT 'N' Bite Ltd | Manufacturing | 2025 |
| CUT 48 Ltd | Other services | 2026 |
| CUT Above (UK) Limited | Manufacturing | 2005 |
| CUT in IT Fine Limited | Manufacturing | 2009 |
| CUT Through Design Limited | Professional & scientific | 2017 |
| Cute Girl Fashion Ltd | Manufacturing | 2019 |
| Cute Pet UK Limited | Real estate | 2020 |
| Cutesy IT Limited | Wholesale & retail | 2025 |
| Cuts Both Ways Limited | Other services | 2002 |
| Cuttle CIC | Water & waste | 2026 |
| Cvalentino Plumber Ltd | Construction | 2022 |
| CVC Electrical & Automation Engineering Ltd | Manufacturing | 2024 |
| CVE Services Limited | Administrative & support | 2022 |
| CVG Salon Ltd | Other services | 2009 |
| CVI Laser Limited | Manufacturing | 2007 |
| CW 2016 Limited | Financial services | 2016 |
| CW Express Limited | Transport & logistics | 2026 |
| CW Investments & Asset Management Ltd | Financial services | 2026 |
| CW JBR Holdings Ltd | Construction | 2017 |
| CW Property Lettings Limited | Real estate | 2021 |
| CW Sweet Holding Ltd | Financial services | 2026 |
| CWA Creative Limited | Financial services | 2001 |
| Cweng Ltd | Professional & scientific | 2024 |
| CWR Holdings Limited | Agriculture & fishing | 2008 |
| CWS Brickwork Ltd | Construction | 2022 |
| CWS Groundworks & Civil Contractors Limited | Construction | 2020 |
| CWT Blanks Limited | Manufacturing | 2024 |
| CWT Clothing Limited | Extraterritorial | 2022 |
| Cxscout Ltd | Administrative & support | 2025 |
| CY Bloom Ltd | Hospitality | 2026 |
| CY Cafe Ltd | Hospitality | 2023 |
| Cyanpear Limited | Professional & scientific | 2013 |
| Cybellium Ltd | Professional & scientific | 2024 |
| Cyber Health Limited | Information & communication | 2025 |
| Cyber Response Limited | Professional & scientific | 2018 |
| Cyber Root Ltd | Information & communication | 2022 |
| Cyber Sales Success Limited | Information & communication | 2021 |
| Cyber Sausage Ltd | Administrative & support | 2017 |
| Cybercomply AI Ltd | Information & communication | 2026 |
| Cybercore Systems Ltd | Information & communication | 2025 |
| Cyberion Solutions Ltd | Information & communication | 2025 |
| Cybermorph Consulting Limited | Information & communication | 2025 |
| Cybernetics Solutions PVT Ltd | Professional & scientific | 2026 |
| Cybersoji Ltd | Information & communication | 2023 |
| Cyberstep Ltd | Education | 2024 |
| Cyblico Ltd | Information & communication | 2026 |
| Cycle-Tri Ltd | Wholesale & retail | 2024 |
| Cyclobarr Limited | Wholesale & retail | 2012 |
| CYF Management Ltd | Information & communication | 2020 |
| CYF Spain Ltd | Information & communication | 2024 |
| Cygnet Mechanical Services Limited | Construction | 2002 |
| Cylindr UK Ltd | Wholesale & retail | 2025 |
| Cymer Marketing Solutions Limited | Professional & scientific | 2019 |
| Cynet Limited | Professional & scientific | 2011 |
| Cypan Developments Ltd | Construction | 2020 |
| Cypan Electrical Contractors Limited | Construction | 2013 |
| Cyps Limited | Professional & scientific | 2004 |
| Cyraeon Ltd | Wholesale & retail | 2019 |
| Cyrus Travels Limited | Transport & logistics | 2022 |
| Czekaj-Trans Ltd | Transport & logistics | 2013 |
| D "N" a Care Services Limited | Health & social care | 2009 |
| D & a Building Services Limited | Construction | 2004 |
| D & a Design Contracts Limited | Arts & recreation | 1990 |