| Collyer Consulting Limited | Shifnal | 2023 |
| Collyer Holdings Limited | Southampton | 2020 |
| Collyers Fresh Limited | Gerrards Cross | 2015 |
| Collyers TMA Limited | Gerrards Cross | 1981 |
| Colman Group Holdings Ltd | Bristol | 2026 |
| Colman Holdings Limited | Weston-Super-Mare | 2020 |
| Colmers Capital Ltd | Bridport | 2023 |
| Colmor Holdings Ltd | Solihull | 2022 |
| Colmore AA Holdings Limited | Redditch | 2021 |
| Colmore AS Holdings Limited | Redditch | 2021 |
| Colmore Capital Ventures II Limited | Warwick | 2020 |
| Colmore Capital Ventures IV Limited | Warwick | 2021 |
| Colmore Capital Ventures Limited | Warwick | 2017 |
| Colmore Capital Ventures V Limited | Warwick | 2023 |
| Colmore Capital Ventures VI Ltd | Warwick | 2025 |
| Colmore Capital Ventures Viii Ltd | Warwick | 2025 |
| Colmore IB Holdings Ltd | Redditch | 2020 |
| Colmore Insurance Brokers Ltd | Redditch | 2014 |
| Colmore Intermediate Ltd | Birmingham | 2015 |
| Colmore Investments Ltd | London | 2015 |
| Colmore Partners Limited | Birmingham | 2018 |
| Colmore PS Ltd | Birmingham | 2016 |
| Colmore Trust Limited | London | 1982 |
| Colmot Ltd | Salisbury | 1998 |
| Colmount Holdings Limited | Milton Keynes | 2020 |
| Coln Residential EOT Limited | Bristol | 2025 |
| Coln Ventures Limited | London | 2023 |
| Colnaghi Holding Ltd | London | 2019 |
| Colnaghi Insurance Brokers Ltd | London | 2021 |
| Colnbrook Homes Ltd | Egham | 2022 |
| Colne 4 Limited | Hertford | 2003 |
| Colne Investment Management Ltd | Chelmsford | 2014 |
| Colne Valley Aviation Holdings Ltd | Earls Colne | 2019 |
| Colne Valley Group Holdings Ltd | Colchester | 2025 |
| Colne Valley Holdings Ltd | Colchester | 2019 |
| Colne Valley Road Holdings Limited | Haverhill | 2025 |
| Colomb Holdings Limited | Swansea | 2020 |
| Colombey Capital Limited | London | 2024 |
| Colombia Girder Capital UK Limited | London | 2020 |
| Colombia Pipelines Limited | London | 1956 |
| Colombian Anglo Limited | Thornton Heath | 2025 |
| Colombo Bidco Limited | Leeds | 2018 |
| Colombo Capital Ltd | London | 2023 |
| Colombo Exchange Company Limited | Hounslow | 2001 |
| Colombo Holdco Limited | Leeds | 2018 |
| Colombo Investment Holdings Limited | Leeds | 2019 |
| Colombo Topco Limited | London | 2018 |
| Colonia Investments Limited | Barnsley | 2024 |
| Colonial Equipment Finance Ltd. | Wokingham | 2008 |
| Colonial Finance (UK) Limited | Solihull | 1986 |
| Colonial Luxury Ltd | London | 2025 |
| Colonial Marketing Ltd | Bromsgrove | 2013 |
| Colonial Rock Limited | Hailsham | 2016 |
| Colonie Brands Ltd | London | 2024 |
| Colonna Global Holdings Limited | Mildenhall | 2023 |
| Colonna Industries Group Limited | Yate | 2016 |
| Colonnade Services Limited | London | 2021 |
| Colonnades Leasehold Limited | London | 2024 |
| Colonsay Capital Limited | Fareham | 2011 |
| Colony Cowork Limited | Manchester | 2018 |
| Colony Operations Limited | Theale | 2018 |
| Color Box Investment Ltd | Hemsworth | 2022 |
| Colorado Holdings Limited | Belfast | 2020 |
| Colorcon European Holdings (NO.5) Limited | Dartford | 2012 |
| Colorlites Holdings Limited | Gateshead | 2018 |
| Colorplas Holdings Limited | Stockport | 2025 |
| Colossus Associates (UK) Holdings Limited | Horsham | 2024 |
| Colossus Bidco Limited | London | 2020 |
| Colossus Financial Solutions Limited | Harrow | 2019 |
| Colossus Midco Limited | London | 2020 |
| Colossus Topco Limited | London | 2020 |
| Colour Data Holdings Limited | Crawley | 2019 |
| Colour Holdings Ltd | London | 2019 |
| Colour Investments Ltd | Belfast | 2006 |
| Colour Mortgages Ltd | London | 2023 |
| Colour Panther Holdings Limited | London | 2025 |
| Colour Supplies (2024) Limited | Eastbourne | 2024 |
| Colourfast World Holdings Ltd | Colchester | 2020 |
| Colourful Concepts Holdings Limited | Coventry | 2020 |
| Colourgem Designs Ltd. | Pinner | 2009 |
| Colourmart Holdings Ltd | Shrewsbury | 2022 |
| Colourmart Software Ltd | Shrewsbury | 2023 |
| Colours Dyers Holdings Limited | Leicester | 2020 |
| Colourvision Holdings Limited | Ilford | 2026 |
| Colpitts Holdings Ltd | Durham | 2026 |
| Colrock Group Ltd | Tonbridge | 2025 |
| Colron Limited | Great Yarmouth | 2024 |
| Colshaw Construction Holdings Limited | Newcaslte Under Lyme | 2020 |
| Colshaw Hall Majorca Ltd | Knutsford | 2016 |
| Colson Group Limited | Heanor | 2025 |
| Colson Holdings Limited | Kettering | 2009 |
| Colson X-Cel Holdings Limited | Stoke On Trent | 2019 |
| Colstar Investments Ltd | Enfield | 2023 |
| Colsterworth Holdings (2018) Limited | Peterborough | 2018 |
| Colstock Holdings Ltd | Worthing | 2015 |
| Colston Trustees Limited | Salisbury | 2009 |
| Colt Capital Investments Ltd | London | 2021 |
| Colt Car Company Limited (the) | London | 1974 |
| Colt Group Limited | Petersfield | 1967 |
| Colt International Holdings Limited | Petersfield | 1985 |