| Carnegie Group (Scotland) Limited | Dunfermline | 2017 |
| Carnegie Investment Asset Management Limited | Bristol | 1998 |
| Carnegie Mortgage and Protection Ltd | Dunfermline | 2017 |
| Carnelian Capital Management Limited | Birmingham | 2013 |
| Carnell Group Holdings Limited | Leeds | 2016 |
| Carnet.Uk.Com Limited | Merseyside | 2000 |
| Carney Consultancy Holdings Limited | Whitley Bay | 2022 |
| Carnie & Gardiner Holding Company Ltd | Blairgowrie | 2025 |
| Carnigo Ltd | London | 2025 |
| Carningli Partners Limited | Felindre Farchog | 2013 |
| Carno Holdings Limited | Caersws | 2015 |
| Carnoustie Golf Heritage and Hospitality Group Limited | London | 2021 |
| Carnovis Specialty Limited | London | 2025 |
| Carnrig Holdings Limited | Newtownabbey | 2025 |
| Carns Company Holdings Ltd | Stourbridge | 2026 |
| Carnweather Limited | Coventry | 2013 |
| Carnwyllon Wealth Management Limited | Llanelli | 2009 |
| Caro Capital Markets Limited | London | 2014 |
| Caro Holdings Ltd | Liverpool | 2019 |
| Carobbio Holdings Limited | Colchester | 2022 |
| Carobo Holdings Ltd | Glasgow | 2026 |
| Carobyn Holdings Ltd | Alford | 2007 |
| Carocelle Holdings Limited | Walsall Wood | 2017 |
| Carodan Ltd | Birmingham | 2018 |
| Carol Holdings Ltd | Dudley | 2025 |
| Carol Joan Holdings Ltd | Newport | 2025 |
| Carol Mitchell Financial Services Limited | Stockton-On-Tees | 2012 |
| Carol Smith Mortgage Services Ltd | Northwich | 2018 |
| Carolbank Holdings Limited | Motherwell | 2019 |
| Carole Nash Insurance Consultants Limited | Salford | 1991 |
| Carole Tonkiss Properties Limited | Ringwood | 2015 |
| Carole Waghorne Limited | Leicester | 2012 |
| Carolean Holdings Ltd | London | 2022 |
| Carolina Invest Private Ltd | London | 2018 |
| Caroline Anderson IFA Ltd | Newcastle Upon Tyne | 2018 |
| Caroline Banks & Associates Limited | Horsham | 1994 |
| Caroline Clare Ltd | Exeter | 2024 |
| Caroline Ellis Mortgages Ltd | Stone | 2025 |
| Caroline Gardner Holdings Limited | London | 2020 |
| Caroline Hughes Mortgage Services Limited | | 2002 |
| Caroline Jones Mortgage Services Ltd | Benfleet | 2018 |
| Caroline Nicholls Limited | Colchester | 2023 |
| Caroline Pearson Limited | Derby | 2015 |
| Caroline Penn Holdings Limited | Hereford | 2022 |
| Carolon Capital UK Limited | London | 2018 |
| Carolyn House (General Partner) Limited | London | 2016 |
| Caromatullo for Trade Ltd | Harrogate | 2024 |
| Carousel Management Holdings (UK) Limited | Waterlooville | 2012 |
| Carousel Ventures Limited | London | 2015 |
| Carow Medical Ltd | Pershore | 2024 |
| Carp Industries Limited | Accrington | 2015 |
| Carp Midco Limited | London | 2022 |
| Carp Topco Limited | London | 2022 |
| Carpa Knightsbridge Limited | London | 2019 |
| Carpanini Group Ltd | Abergavenny | 2026 |
| Carpanini Ltd | Nr Cowbridge | 2024 |
| Carpathia Holdings Limited | Chippenham | 2021 |
| Carpathian Finance Limited | Bedfordshire | 1995 |
| Carpathian Group Limited | Shildon | 2015 |
| Carpathian VC Ltd | London | 2026 |
| Carpe Diem 13 Limited | Castlewellan | 2025 |
| Carpe Diem Holdings (South West) Ltd | Shepton Mallet | 2026 |
| Carpe Diem Management | Wadhurst | 2017 |
| Carpe Diem Portfolio Ltd | Warrington | 2026 |
| Carpe Diem Private Client Ltd | Warwick | 2017 |
| Carpe Momentum Limited | Treharris | 2016 |
| Carpe Omina Holdings Ltd | Cardiff | 2025 |
| Carpe Vinum Cellars Limited | Ballater | 2022 |
| Carpegna Ltd | London | 2017 |
| Carpenia Holdings Ltd | Manchester | 2022 |
| Carpenter & Sons (Holdings) Limited | Dudley | 2024 |
| Carpenter Additive (U.K.) Ltd | London | 2018 |
| Carpenter Box Professional Services Limited | London | 2023 |
| Carpenter Davies Partnership Holdings Limited | Denbigh | 2018 |
| Carpenter Enterprises Limited | Ampthill | 2021 |
| Carpenter Europe Limited | Altrincham | 2026 |
| Carpenter Farraday Holdings Limited | London | 2024 |
| Carpenter Hotels Limited | Truro | 2017 |
| Carpenter John Financial Services Ltd | Port Talbot | 2008 |
| Carpenter One Limited | Altrincham | 2026 |
| Carpenter Rees Consulting Limited | Manchester | 2015 |
| Carpenter Rees Limited | Manchester | 1996 |
| Carpenter Two Limited | Altrincham | 2026 |
| Carpenter Wealth Management Limited | Ashford | 2015 |
| Carpenters Group Limited | London | 2020 |
| Carpenters Holdings Limited | Liverpool | 2012 |
| Carpenters Resolver Limited | Liverpool | 2018 |
| Carpentry Consultancy Limited | Greenford | 2026 |
| Carpet & Latex Holdings Ltd | Bolton | 2022 |
| Carpet Mill (Coventry) Limited | Coventry | 2020 |
| Carpet News Holdings Limited | Southampton | 2025 |
| Carpo Holdings & Investments Ltd | Dudley | 2026 |
| Carpol Insurance Consultants Limited | Worthing | 1977 |
| Carr & Co (NE) Holding Limited | Blyth | 2021 |
| Carr Financial Limited | Lincoln | 2006 |
| Carr Financial Planning Ltd | North Shields | 2023 |
| Carr Grange Holdings Limited | Doncaster | 2003 |
| Carr Holdings International Limited | Islington | 2021 |
| Carr Holdings Limited | Leeds | 2021 |
| Carr Int'L Ltd | Tewkesbury | 2014 |