| Colt Mortgages Ltd | Poole | 2026 |
| Colt Self Storage JV Limited | London | 2024 |
| Coltec Finance Company Limited | Birmingham | 2002 |
| Coltec Holdings and Investments Ltd | Dudley | 2019 |
| Coltech Global Limited | Barnsley | 2019 |
| Colthrop Holdings Limited | Thatcham | 2011 |
| Coltkell Holdings Limited | Stafford | 2026 |
| Coltman Holdings Limited | Nottingham | 2020 |
| Coltman-Bland Holdings Limited | Shrewsbury | 2024 |
| Colton Edwards Limited | Morden | 2016 |
| Colton Services Limited | Ilkeston | 2020 |
| Colton UK Btls Limited | London | 2016 |
| Coltrun Limited | Cardiff | 2016 |
| Columb Group Ltd | Chelmsford | 2023 |
| Columba Europe Ltd. | Kent | 2004 |
| Columba Investments | London | 2024 |
| Columbae Group Limited | London | 2026 |
| Columbia 50TH Investment Ltd | Malvern | 2019 |
| Columbia Holdings Limited | Barnstaple | 2022 |
| Columbia Investments Limited | London | 2022 |
| Columbia Lake Partners Growth Lending (Holdings SUB), Limited | Kingston Upon Thames | 2014 |
| Columbia Metals Holdings Limited | Bedford | 2016 |
| Columbia Threadneedle (EM) Investments Limited | London | 1995 |
| Columbia Threadneedle (Europe) Limited | London | 2014 |
| Columbia Threadneedle AM (Holdings) Limited | Edinburgh | 1980 |
| Columbia Threadneedle Asset Managers Limited | London | 1990 |
| Columbia Threadneedle Capital (UK) Limited | London | 1997 |
| Columbia Threadneedle Fund Management Limited | London | 1987 |
| Columbia Threadneedle Holdings Limited | London | 1989 |
| Columbia Threadneedle Investments UK International Limited | London | 2021 |
| Columbia Threadneedle REP PM Limited | London | 2012 |
| Columbiforme Holdings Ltd | London | 2021 |
| Columbo Debt Advisory Ltd | Copthorne | 2024 |
| Columbo Software Ltd | Ipswich | 2021 |
| Columbus Energy Partners Limited | London | 2016 |
| Columbus Fifty Eight Ltd | Dromore | 2021 |
| Columbus Fifty Four Limited | Bolton | 2018 |
| Columbus Fifty Nine Ltd | Kettering | 2021 |
| Columbus Fifty One Limited | Skelmersdale | 2017 |
| Columbus Fifty SIX Limited | Tadcaster | 2018 |
| Columbus Fifty Three Limited | Chelmsford | 2018 |
| Columbus Forty Five Limited | Newport | 2016 |
| Columbus Forty SIX Limited | Moorgate | 2016 |
| Columbus Forty Three Limited | Penarth | 2016 |
| Columbus Innovations Limited | Glasgow | 1999 |
| Columbus Insurance Services Limited | London | 1991 |
| Columbus Investments Ltd | Horsham | 2021 |
| Columbus One Thousand Limited | Basildon | 2019 |
| Columbus Sixty Ltd | Ruislip, | 2021 |
| Columbus Sixty One Ltd | Harpenden | 2024 |
| Columbus TEN Limited | Ellesmere Port | 2007 |
| Columbus Thirty Three Limited | Knowlhill | 2012 |
| Columbus Twenty Eight Limited | Bristol | 2010 |
| Columbus Twenty Five Limited | Dorking | 2010 |
| Columbus Venture Ltd | Normanton | 2015 |
| Columbvs Ltd | London | 2018 |
| Columna Ltd | Lancing | 2024 |
| Columnj Ltd | London | 2022 |
| Columnwheel Global Holdings Limited | London | 2026 |
| Coluxe Infinite Holdings Limited | Prudhoe | 2025 |
| Colvestone Consulting Ltd | London | 2023 |
| Colvil Ltd | Glasgow | 2010 |
| Colvile Securities Limited | East Malling | 2013 |
| Colville Capital Partners Limited | Milton Keynes | 2012 |
| Colville Hartley & Parsons Financial Services Ltd. | Exeter | 2011 |
| Colvin Holdings Limited | London | 2021 |
| Colwell Holdings Limited | Moreton-In-Marsh | 2025 |
| Colwena Holdings Limited | Belfast | 2024 |
| Colwill Group Holdings Ltd | Bude | 2026 |
| Colwood & Tilford Holdings Ltd | Featherstone | 2023 |
| Colwood Estate Planning Services Ltd | Stourport-On-Severn | 2015 |
| Coly Investments Limited | Nottingham | 1992 |
| Colyer Holdings Limited | Woodbridge | 2025 |
| Colyer Management Services Ltd | Pickering | 2013 |
| Colyzeo Investment Advisors Limited | London | 2003 |
| Colyzeo Investment Management Limited | London | 2003 |
| COM 2026 Limited | Newtownabbey | 2022 |
| COM FIN Solutions Limited | Ipswich | 2019 |
| COM Holdings Limited | Glasgow | 2021 |
| COM Laude Group Limited | London | 2017 |
| Com-Iron Co.,Limited | Leighton Buzzard | 1928 |
| Comac Group Investments Ltd | Motherwell | 2024 |
| Comac Holdings Ltd | Holytown | 2013 |
| Comac Medical Group Ltd | London | 2025 |
| Comack Limited | North Lincolnshire | 2004 |
| Comap Control Holdings Limited | Oldbury | 2019 |
| Comar Line Limited | Surrey | 1935 |
| Comar Test Systems Ltd | Coventry | 2026 |
| Comas Group Limited | London | 2026 |
| Comash Holdings Ltd | Nuneaton | 2021 |
| Comasi Group Ltd | Pontyclun | 2021 |
| Comast Holdings Limited | Bournemouth | 2019 |
| Comb Bidco Limited | Lynchwood | 2024 |
| Comb Topco Limited | Lynchwood | 2024 |
| Combat Medical Holdings Ltd | Wheathampstead | 2017 |
| Combe Capital Limited | Abingdon | 2026 |
| Combe Estates Limited | Monkton Combe | 2025 |
| Combe Farm Limited | London | 2024 |
| Combe Holdings Limited | Abingdon | 2026 |
| Combellack Vehicle Recyclers Holdings Limited | St. Austell | 2019 |