| Clifton Wealth Partnership Portishead Limited | Bristol | 2017 |
| Clik Holdings Limited | Birmingham | 2018 |
| Cliken Limited | Slough | 2021 |
| Cliking Investment Ltd | London | 2014 |
| Climacare Commissioning Holdings Limited | Erith | 2023 |
| Climacina Ltd | Totnes | 2022 |
| Climacore Ventures Ltd | Rochdale | 2026 |
| Climarsal Trustee Limited | Northampton | 1989 |
| Climastry Ltd | Cambridge | 2022 |
| Climate Asset Management Holdings Limited | London | 2021 |
| Climate Asset Management Limited | London | 2020 |
| Climate Capital Ltd | London | 2019 |
| Climate Care Solutions Limited | Coventry | 2018 |
| Climate Change Holdings Limited | Peterborough | 2002 |
| Climate Holdings Ltd | Bournemouth | 2018 |
| Climate Impact Partners (Project Bella) Limited | London | 2025 |
| Climate Impact Partners (Project Panna) Limited | London | 2024 |
| Climate Impact Partners (Projects) Limited | London | 2024 |
| Climate Impact Partners Bidco Limited | London | 2020 |
| Climate Impact Partners Finco Limited | London | 2020 |
| Climate Impact Partners Midco Limited | London | 2020 |
| Climate Investment (Anybotics) Ltd | London | 2025 |
| Climate Investment (Energy Robotics) Ltd | London | 2025 |
| Climate Investment (Oman Holdings) Limited | London | 2021 |
| Climate Investment (Xocean) Limited | London | 2024 |
| Climate Investments Limited | Bournemouth | 2022 |
| Climate Kick Ltd | London | 2023 |
| Climate Risk Metrics Ltd | Cambridge | 2020 |
| Climate Solutions International Limited | London | 2022 |
| Climate VC Syndicate Ltd | London | 2022 |
| Climatec Group Holdings Limited | Leigh-On-Sea | 2020 |
| Climatec Group Limited | Southend-On-Sea | 2024 |
| Climatech Infrastructure Leasing Ltd. | Cardiff | 2021 |
| Climavent Group Limited | St. Helens | 2021 |
| Climb Holdings Limited | Milnthorpe | 2025 |
| Climb UK Holdco 1 Limited | London | 2022 |
| Climb UK Holdco 2 Limited | London | 2022 |
| Climber Bidco Limited | London | 2022 |
| Climber FX Co 1 Limited | London | 2022 |
| Climber FX Co 2 Limited | London | 2022 |
| Climber Midco 1 Limited | London | 2022 |
| Climber Midco 2 Limited | London | 2022 |
| Climber Topco Limited | London | 2022 |
| Climbfort Property Management Limited | London | 1983 |
| Climbing Partners UK (2) Ltd | London | 2021 |
| Climbing Partners UK Ltd | London | 2021 |
| Clime Ltd | Manchester | 2025 |
| Climetrek Ltd | Ashford | 2021 |
| Climpy Co Limited | London | 2025 |
| Climsen Ltd | London | 2024 |
| Clinchplain Foam and Fibre Limited | Preston | 2025 |
| Clinic 360 Limited | Burgess Hill | 2015 |
| Clinic 95 Holdings (2) Limited | Botley | 2024 |
| Clinic 95 Holdings (3) Limited | Oxford | 2024 |
| Clinic Group Holdings Limited | Rickmansworth | 2026 |
| Clinic MAN Ltd | Dundee | 2018 |
| Clinical Holdings Ltd | Stockport | 2024 |
| Clinical Investments Limited | St. Albans | 2023 |
| Clinical Partners Group Limited | Shaftesbury | 2024 |
| Clinical Pyramid Limited | London | 2017 |
| Clinical Trials Insurance Services Limited | London | 2026 |
| Clinilinx Limited | Brentwood | 2018 |
| Clinisupplies Group Limited | London | 2022 |
| Clinisys Europe Limited | Birmingham | 2008 |
| Clinisys Information Systems (International) Limited | Birmingham | 1992 |
| Clinitek (Stoke) GP Ltd | Edinburgh | 2020 |
| Clinitek Investor GP Ltd | Edinburgh | 2019 |
| Cliniwaste Holdings Limited | Glasgow | 2021 |
| Clinkard Holdings Limited | Middlesbrough | 2023 |
| Clinsentry Holdings Limited | London | 2023 |
| Clint Limited | Taunton | 2008 |
| Clinton Drayton Wealth Management Limited | Worthing | 2014 |
| Clinton Family Holdings Limited | London | 2025 |
| Clinton Kennard Associates Ltd | Fareham | 2009 |
| Clinx Global Ltd | London | 2026 |
| Clio General Limited | London | 2021 |
| Clio Peppiatt Holdings Ltd | Leicester | 2024 |
| Clip Bidco Limited | London | 2021 |
| Clip Midco Limited | London | 2021 |
| Clip Topco Limited | London | 2021 |
| Clipeum IT (Alpha) Ltd | Bolton | 2020 |
| Clipeum IT (Beta) Ltd | Bolton | 2022 |
| Clipper Carina I Ltd | London | 2026 |
| Clipper CG Holdings Limited | Dorchester | 2016 |
| Clipper Investments Group Limited | Leeds | 2025 |
| Clipperton Finance Limited | London | 2009 |
| Clipstone Jvco Limited | London | 2025 |
| Clipway Limited | London | 2021 |
| Cliqmates Holdings (UK) Ltd | London | 2026 |
| Clique Research Ltd | London | 2016 |
| Clisk Holdings | Bridgwater | 2025 |
| Clita & Sons Supplies & Consultancy Limited | Birmingham | 2012 |
| Clitheroe Pharma Ltd | Clitheroe | 2011 |
| Clive 2025 Limited | London | 2025 |
| Clive Barrington Caddick Financial Services Ltd. | Wirral | 2005 |
| Clive Henry Group Limited | Birmingham | 2022 |
| Clive Hill GCP Investments Limited | London | 2019 |
| Clive Holdings Ltd | Birmingham | 2024 |
| Clive KAC Ltd | London | 2021 |
| Clive Ribbons Limited | Estover | 2008 |