| Crushing Spares International Limited | Leicester | 2008 |
| Crushing Spares Limited | Leicester | 2008 |
| Cruspedin Limited | Salford | 2018 |
| Cruto Ltd | Stourbridge | 2024 |
| Crux London Ltd | Tunbridge Wells | 2014 |
| Cruz and Greyson Group Ltd | Fareham | 2019 |
| CRW Guildford Limited | Guildford | 2014 |
| CRW Limited | Suffolk | 1993 |
| CRY GOD 4 Harry Limited | High Wycombe | 2016 |
| Crydon Limited | Bury | 2021 |
| Crying Wolf Ltd | Hereford | 2012 |
| Cryo Home Ltd | Exmouth | 2024 |
| Cryo MOD Ltd | Newtownabbey | 2023 |
| Cryocom Ltd | Middlesbrough | 2017 |
| Cryogen Limited | Keston | 2020 |
| Cryolec Ltd | London | 2025 |
| Cryomagnetic Systems Limited | Long Eaton | 1968 |
| Cryon Limited | Wantage | 2012 |
| Cryostar Limited | Woking | 1954 |
| Cryotech Limited | Gwent | 1998 |
| Cryptec Ltd | Bexleyheath | 2024 |
| Cryptic Mind Tech Limited | Liverpool | 2025 |
| Cryptkey Investments Limited | Shipston-On-Stour | 2023 |
| Crypto Commodity Group Limited | Henley In Arden | 2015 |
| Crypto EFX Ltd | London | 2017 |
| Crypto Ltd | London | 2016 |
| Crypto News Ltd | Bristol | 2024 |
| Cryptocurrency Ltd | Doncaster | 2019 |
| Cryptofin Ltd | London | 2014 |
| CRYPTONB1 Ltd | Addlestone | 2022 |
| Cryptoshell Ltd | Gloucester | 2018 |
| Crystal Advisory Limited | Leighton Buzzard | 2012 |
| Crystal Brook Realty Management Ltd | Manchester | 2026 |
| Crystal Building Developments Limited | Coventry | 2022 |
| Crystal Clean Windows Limited | Spalding | 2019 |
| Crystal Clear Home Solutions Limited | London | 2023 |
| Crystal Clear Windows and Conservatories Limited | Bristol | 2010 |
| Crystal CUT Lingerie Limited | Liverpool | 2024 |
| Crystal Grove Ltd | London | 2025 |
| Crystal Heaven Ltd | Maldon | 2011 |
| Crystal Industrial Co., Ltd. | Beckenham | 2014 |
| Crystal Light Ltd | Cardiff | 2019 |
| Crystal Luxury Events Ltd | Cwmbran | 2020 |
| Crystal Path Services Ltd | London | 2026 |
| Crystal Point Support Team Ltd | Manchester | 2026 |
| Crystal Property Holdings Limited | Solihull | 2015 |
| Crystal Security Trustee Limited | Sunderland | 2015 |
| Crystal Vanguard Capital Ltd | Manchester | 2025 |
| Crystalgrid Ltd | Haverfordwest | 2022 |
| Crystalhaven Services Ltd | London | 2025 |
| Crystalline Health & Beauty From the Dead Sea UK Ltd | Brighton | 2019 |
| Crystalrain Limited | Stockport | 2002 |
| Crystalwave Cleaners Ltd | London | 2026 |
| CS 2 Energy Limited | Wantage | 2014 |
| CS Amenities Limited | Huntingdon | 2002 |
| CS and LW Ltd | Bristol | 2017 |
| CS Automation (Telford) Limited | Telford | 2020 |
| CS Business Connexions Limited | Telford | 2022 |
| CS Civil Engineering Limited | Bolton | 2021 |
| CS Civils Limited | Bolton | 2020 |
| CS Company Restorations (UK) Limited | Telford | 2024 |
| CS Designandintuition Ltd | London | 2022 |
| CS Display Co., Ltd | Kenilworth | 2018 |
| CS Event Hire Limited | Jarrow | 2015 |
| CS Groundworks Limited | Bolton | 2021 |
| CS Legal Wills & Probate Limited | Telford | 2025 |
| CS Medical Aesthetics Ltd | Newtownards | 2021 |
| CS Randhawa Enterprise Ltd | Wantage | 2023 |
| CS Windows Limited | Birkenhead | 2017 |
| CS2 Retail Limited | Norwich | 2017 |
| CSA Accountants UK Limited | Peterborough | 2017 |
| CSA Global (UK) Limited | London | 2008 |
| CSA Systems Ltd | Birkenhead | 2021 |
| CSC (Specialised Vehicles) Limited | Hull | 1995 |
| CSC Investment Limited | London | 2018 |
| CSC Vision Limited | Stafford | 2016 |
| CSE Ltd | Alfreton | 2022 |
| CSG Car Sales Limited | Gerrards Cross | 2014 |
| CSH Consulting Limited | Corby | 2024 |
| CSH Recycling Limited | Colchester | 2009 |
| CSH Services Limited | Norwich | 2021 |
| Cshc Limited | Wrexham | 2014 |
| CSI Solutions Limited | Winsford | 2024 |
| Csilab Ltd | London | 2021 |
| CSJ (UK) Limited | Derby | 2012 |
| CSJ Fiduciary Management Ltd | Cradley Heath | 2019 |
| CSJ Joinery Limited | Edinburgh | 2025 |
| CSK Bespoke Kitchens Limited | Bo'Ness | 2023 |
| CSK Broadcast Engineering Ltd | Leatherhead | 2010 |
| Cskr Ltd | Southampton | 2017 |
| Cskrt Ltd | Southampton | 2021 |
| CSL Entertainment Belfast Ltd | Dungannon | 2019 |
| Csln Education Ltd | King'S Lynn | 2026 |
| CSM Beasley Holdings Ltd | Stourport-On-Severn | 2025 |
| CSM Management Ltd | Coventry | 2023 |
| Csms Ltd | London | 2009 |
| CSP (Coventry) 2017 Limited | Balsall Common | 2003 |
| CSP Homes Ltd | Hitchin | 2020 |
| CSP Industries Co., Ltd. | Ruislip | 2023 |
| CSP Promotions Limited | Saltash | 2001 |