| Clean Seas Partners UK Limited | London | 2023 |
| Clean Slate Capital Limited | Aylesbury | 2026 |
| Clean Solar Power (Eastern Europe) Limited | London | 2019 |
| Clean Spring Flower Group Limited | London | 2025 |
| Clean Valley Capital Limited | London | 2024 |
| Clean World Technology Africa Ltd | Leicester | 2025 |
| Clean World Technology Engineering Ltd | Leicester | 2024 |
| Clean World Technology TM Ltd | Leicester | 2022 |
| Cleanbridge Advisors (UK) Ltd | London | 2022 |
| Cleancap Advisory Limited | Pershore | 2019 |
| Cleancroft Ltd | Lancashire | 2000 |
| Cleaneco Group Limited | Normanton | 2019 |
| Cleaner Projects Limited | Dudley | 2018 |
| Cleanheart Finishing Limited | Chigwell | 2023 |
| Cleanheating Company Ltd | Bognor Regis | 2025 |
| Cleanova Holding Limited | London Road | 2023 |
| Cleanova Midco Limited | London Road | 2023 |
| Cleanpitt Ltd | Bridgend | 2020 |
| Cleanslate Financial Limited | Glasgow | 2026 |
| Cleanslate Group Limited | Hungerford | 2023 |
| Cleanstal Ltd | Smethwick | 2026 |
| Cleanstream Group Limited | Bristol | 2021 |
| Cleantech Building Materials PLC | London | 2014 |
| Cleantech Capital Advisors Limited | London | 2011 |
| Clear & Dynamic Solutions Limited | Oldbury | 2017 |
| Clear (Holdings) Limited | Cwmbran | 2014 |
| Clear Advice (Scotland) Limited | Glasgow | 2014 |
| Clear Advice Mortgage & Protection Ltd | Bournemouth | 2022 |
| Clear Advice Mortgage Services Limited | Newport | 2021 |
| Clear Advice Mortgages Ltd | Northampton | 2025 |
| Clear Amber Group Holdings Ltd | Kinross | 2020 |
| Clear Asset Finance Limited | Hornchurch | 2010 |
| Clear Benefits Consultancy Ltd | Coventry | 2015 |
| Clear Bookings Ltd | London | 2025 |
| Clear Books Trustee Ltd | London | 2014 |
| Clear Business Finance Limited | Hornchurch | 2019 |
| Clear Buy 2 LET Limited | Washington | 2016 |
| Clear Capital Corporate Broking Ltd. | Epsom | 2020 |
| Clear Capital Finance Limited | London | 2024 |
| Clear Capital Limited | London | 2024 |
| Clear Capital Management Limited | London | 2024 |
| Clear Capital Markets Ltd | London | 2014 |
| Clear Capital Wealth Ltd | Hereford | 2017 |
| Clear Care Solutions Holdings Limited | Stafford | 2022 |
| Clear Care Solutions Midco Limited | Brighton | 2025 |
| Clear Care Solutions Topco Limited | Stafford | 2025 |
| Clear Cashflow Solutions Ltd | Telford | 2022 |
| Clear Charge Claims Ltd | Clitheroe | 2025 |
| Clear Compliance Solutions Ltd | London | 2017 |
| Clear Construction Finance Limited | Hornchurch | 2020 |
| Clear Cost Utilities Limited | Gateshead | 2022 |
| Clear Cover 2 (UK) Limited | Croft | 2024 |
| Clear Cover Taxi Warranties Limited | Lincoln | 2026 |
| Clear Cover Warranties Limited | Lincoln | 2025 |
| Clear CUT Financial Planning Limited | Ledsham | 2012 |
| Clear CUT Ltd | Shrewsbury | 2023 |
| Clear Debt Direct Ltd | Stockton-On-Tees | 2007 |
| Clear Exit Partners Limited | Colchester | 2024 |
| Clear Finance and Insurance Ltd | Doncaster | 2016 |
| Clear Financial (Leicester) Ltd | Loughborough | 2019 |
| Clear Financial (Midlands) Ltd | Loughborough | 2017 |
| Clear Financial Advice Limited | Beckenham | 2001 |
| Clear Financial Planning Ltd | Paisley | 2025 |
| Clear Financial Services (UK) Limited | Bury St Edmunds | 2007 |
| Clear Financial Solutions (Midlands) Ltd | Belper | 2009 |
| Clear FP Limited | Ayr | 2017 |
| Clear FS Holdings Limited | Belper | 2025 |
| Clear Funding Solutions Ltd | Altrincham | 2016 |
| Clear Future Financial Planners Limited | Nr Stonehouse | 2020 |
| Clear Future Holdings Limited | Near Stonehouse | 2022 |
| Clear Future Wealth Management Limited | Sheffield | 2014 |
| Clear Glass Holding Ltd | Preston | 2026 |
| Clear Global Capital Limited | London | 2019 |
| Clear Global VG Ltd | London | 2023 |
| Clear Horizon Investments Limited | Chesterfield | 2025 |
| Clear Idea Finance Limited | Ipswich | 2020 |
| Clear IFA Limited | Billericay | 2004 |
| Clear Impact Accountancy Limited | Northfleet | 2009 |
| Clear in Cloud Ltd | Ascot | 2014 |
| Clear Independent Financial Solutions Limited | Cheddar | 2009 |
| Clear Insurance Limited | Rayleigh | 2011 |
| Clear Insurance Management Limited | London | 1999 |
| Clear Introduction Limited | Wigan | 2017 |
| Clear Investment Solutions Limited | Crewe | 2011 |
| Clear Junction Digital Limited | London | 2016 |
| Clear Junction Limited | London | 2016 |
| Clear Line Holdings Ltd | Sheffield | 2012 |
| Clear Logic Money Ltd | Bolton | 2018 |
| Clear Markets Europe Limited | London | 1999 |
| Clear Mortgage Advice Ltd | Glasgow | 2019 |
| Clear Mortgage and Protection Solutions Ltd | Birmingham | 2005 |
| Clear Mortgage Services Ltd | Walton-On-Thames | 2016 |
| Clear Mortgage Solutions Limited | Edinburgh | 2013 |
| Clear Mortgages (NW) Ltd | Ashton-Under-Lyne | 2020 |
| Clear My Credit Ltd | Halifax | 2018 |
| Clear Path Debt Solutions Limited | Manchester | 2022 |
| Clear Path Holdings Limited | Eccles | 2025 |
| Clear Path Mortgages Limited | Glasgow | 2025 |
| Clear Path Testing Limited | London | 2023 |
| Clear Pathway Financial Planning Limited | Manchester | 2025 |