| Congueror Yachting Ltd | London | 2023 |
| Conibear Consulting Limited | Exeter | 2021 |
| Conington 1966 Limited | Beverley | 2013 |
| Conisholme Farms (Holdings) Limited | Louth | 1988 |
| Coniston Court Management Company Limited | Earl Shilton | 1989 |
| Coniston Flats Freehold Limited | London | 2009 |
| Conita Ltd | London | 2025 |
| Conker IT Ltd | Ulverston | 2023 |
| Conker Marine Limited | Totnes | 2016 |
| Conlupo Ltd | Manchester | 2023 |
| Conmec Limited | Carnoustie | 2018 |
| Connaught Coachworks Ltd | Preston | 2014 |
| Connaught House Management Limited | Woking | 1985 |
| Connaught Leisure Investments Ltd | Worthing | 2012 |
| Connaught Media and PR Limited | Peterborough | 2012 |
| Connaught Media Limited | Kings Lynn | 2016 |
| Connaught Motor Co. (1932) Ltd | Preston | 2014 |
| Connaught Properties Manchester Ltd | Salford | 2024 |
| Connaught ST James Limited | Reading | 1995 |
| Connaught Training Services Limited | Warrington | 2002 |
| Connect 2 Electrical Services Ltd | Wigan | 2011 |
| Connect A.D. Limited | Glasgow | 2001 |
| Connect Air Limited | East Horsley | 2021 |
| Connect Live Associates Limited | Weybridge | 2026 |
| Connect Media Ltd | London | 2004 |
| Connect My Car Ltd | Glossop | 2016 |
| Connect Recruitment Services Limited | Hailsham | 2020 |
| Connect Relationship & Psychosexual Therapy Ltd | Bromley | 2021 |
| Connect Through Community Ltd | London | 2024 |
| Connect Training Limited | Gloucester | 2015 |
| Connect UP Ltd | London | 2020 |
| Connected Care Bidco Limited | Guildford | 2022 |
| Connected Care Holdings Limited | Guildford | 2022 |
| Connected Collective Holdings Limited | Chippenham | 2009 |
| Connected Compliance Ltd | Deddington | 2023 |
| Connected Conservation Foundation | London | 2018 |
| Connected Light Limited | Bristol | 2016 |
| Connected Pictures Ltd | London | 2022 |
| Connected Place Limited | Berkshire | 1995 |
| Connecting Gate Ltd | London | 2021 |
| Connecting the Spectrum Ltd | Isleworth | 2016 |
| Connections (AML) Limited | Newbury | 1982 |
| Connections (Group) Limited | Watford | 2025 |
| Connectivity Team Coaching Limited | London | 2025 |
| Connectr Limited | Leatherhead | 2021 |
| Connectskies Limited | East Horsley | 2020 |
| Connectsmusic Limited | Harrow On The Hill | 2025 |
| Connectstream Innovations Ltd | Edinburgh | 2026 |
| Connecturelations Ltd | Haverfordwest | 2025 |
| Connells (MIH) Limited | Leighton Buzzard | 2008 |
| Connellycomms Ltd | Glasgow | 2012 |
| Connetu Ltd | London | 2026 |
| Connexions West of England Limited | Bristol | 2000 |
| Connick Tree Care (Brighton) Limited | Reigate | 2003 |
| Connick Tree Care (Reigate) Limited | Reigate | 2003 |
| Connies Kinikk Investment Limited | London | 2025 |
| Connislow Investments Limited | Chesterfield | 2012 |
| Conniston Limited | Liverpool | 2011 |
| Connoisseur Cards Limited | Bradford | 1967 |
| Connoisseur International Wines Limited | Woking | 2014 |
| Connoisseur of Malvern Limited | Richmond | 2015 |
| Connolly Associates Limited | Romford | 1990 |
| Connor and Graham Limited | Newcastle Upon Tyne | 1955 |
| Connor David George Taylor Ltd | London | 2024 |
| Connor's Doagh Limited | Belfast | 2011 |
| Connubio Ltd | London | 2019 |
| Connys Rivningstjanster Limited | London | 2024 |
| Conon Bridge Takeaway Limited | Glasgow | 2021 |
| Conquest OIL NRG Ltd | Hartlepool | 2018 |
| Conrad Designer Bathrooms Limited | Wokingham | 2010 |
| Conradd Limited | Harrogate | 2012 |
| Conradi Ltd | Dartford | 2006 |
| Conscious Accessories Ltd | Bristol | 2022 |
| Conscious Consultancy Limited | Macclesfield | 2022 |
| Conscious Occasions Ltd | Stevenage | 2020 |
| Consensus Capital Trustee Limited | Edinburgh | 2017 |
| Consensus Henson Limited | Colchester | 2015 |
| Consensus Newco Limited | Colchester | 2013 |
| Consently Ltd | Southport | 2015 |
| Conseq Invest Limited | London | 2017 |
| Conservation Building Renovation Limited | Wednesbury | 2012 |
| Conservation Canine UK Limited | Holywell | 2012 |
| Conservation Dogs.Com Limited | Holywell | 2012 |
| Conservativesvoicesme Ltd | Bristol | 2025 |
| Conservativevoiceltdme.Uk Ltd | Bristol | 2025 |
| Conservatory Blinds Ltd | Epsom | 2022 |
| Conservatory Solid Roofs Limited | Halstead | 2010 |
| Conservatory World Ltd | Port Talbot | 2026 |
| Conservatree Print & Design Limited | Reading | 2020 |
| Conserve Global | London | 2020 |
| Conserve Management Limited | London | 2021 |
| Consetec Holding Ltd | Manchester | 2023 |
| Considered Media Group Limited | London | 2023 |
| Consiglieri Limited | Harrow | 2024 |
| Consilium Advisory & Management Consulting Limited | Isleworth | 2018 |
| Consilium Corporate Finance Limited | Glasgow | 2013 |
| Consilium Investments Limited | London | 2015 |
| Consilium Property Limited | London | 2014 |
| Consilium RE Specialty Limited | London | 2021 |
| Consoleting Ltd | Coalville | 2021 |