| Company Three Theatre | London | 2016 |
| Company Two Tattoos Ltd | Marketplace, Shrewsbury | 2025 |
| Company Ucda Limited | Cleethorpes | 2025 |
| Comparsa Ltd | London | 2024 |
| Compass Community Arts | Eastbourne | 2003 |
| Compass Company (Glasgow) Ltd | Glasgow | 2022 |
| Compass Cricket Limited | Bromsgrove | 2018 |
| Compass Dance Studios Ltd | Worthing | 2011 |
| Compass Entertainment Ltd | Scarborough | 2004 |
| Compass Film Community Interest Company | Bristol | 2007 |
| Compass Gardens EA Limited | Great Yarmouth | 2023 |
| Compass Live Art Limited | Leeds | 2014 |
| Compass Martial Arts Goole Ltd | Castleford | 2025 |
| Compass Padel Ltd | London | 2026 |
| Compass Sea School Limited | London | 2006 |
| Compassionart Limited | Abergavenny | 2007 |
| Compassionart Publishing Limited | Abergavenny | 2007 |
| Compello Fitness Ltd | Malton | 2013 |
| Compete for Cars Ltd | Huntingdon | 2026 |
| Compete Sports Group Ltd | Basildon | 2023 |
| Competeeasy Limited | Hassocks | 2015 |
| Competidor Ltd | Haywards Heath | 2013 |
| Competition Bros Ltd | Solihull | 2020 |
| Competition Group Ltd | London | 2024 |
| Competition Line (U.K.) Limited | Darlington | 1982 |
| Competition Mania Ltd | London | 2020 |
| Competition Phoenix Ltd | Newton Abbot | 2025 |
| Competition Sisters Ltd | Stoke-On-Trent | 2023 |
| Competitions Cartel Ltd | London | 2025 |
| Competitionz Ltd | London | 2026 |
| Competitive Edge Golf Limited | Cheadle | 2009 |
| Competitive Edge Sports Ltd | New Malden | 2010 |
| Competitors Companion Limited | Telford | 2000 |
| Compleat Enterprises Ltd | Haverhill | 2011 |
| Compleat Quiz Limited | London | 2017 |
| Complete Active Christchurch Ltd | Christchurch | 2020 |
| Complete Athlete Management Ltd | York | 2026 |
| Complete CM Ltd | Norwich | 2026 |
| Complete Coaching Solutions Limited | Doncaster | 2015 |
| Complete Entertainment Ltd | Bury St. Edmunds | 2023 |
| Complete Event Management Company Limited | Hull | 2018 |
| Complete Fictions Limited | Lewes | 2006 |
| Complete Fitness Gyms Limited | Norwich | 2016 |
| Complete Fitness Ltd | Ormskirk | 2025 |
| Complete Health and Fitness Limited | Braintree | 2001 |
| Complete JIU Jitsu Limited | Dagenham | 2024 |
| Complete Landscape Garden Services Limited | Lewes | 1995 |
| Complete Leisure Services Limited | Deeside | 2021 |
| Complete Life Fitness Limited | York | 2018 |
| Complete Madness Limited | Chesterfield | 2000 |
| Complete Music and Sound Ltd | London | 2024 |
| Complete Performance Ltd | Basingstoke | 2015 |
| Complete Physique Limited | Grimsby | 2015 |
| Complete Player Football Academy Ltd | London | 2019 |
| Complete Skydiving Solutions Limited | Nottingham | 2024 |
| Complete Sports Group Ltd | Solihull | 2022 |
| Complete Staging Ltd | Nelson | 2021 |
| Complete Waste Services Limited | Rayleigh | 1996 |
| Complete Works Performance School Limited | Birkenhead | 2016 |
| Completely Content Ltd. | Milton Keynes | 2015 |
| Completely Unexpected Productions Limited | London | 1979 |
| Complex Media Ltd | London | 2025 |
| Complex Productions Ltd | London | 2018 |
| Complexity Limited | London | 1988 |
| Complicite Enterprises Limited | Gloucester | 2004 |
| Compnd Coaching Ltd | Worthing | 2025 |
| Compon Ltd | Pontypool | 2023 |
| Compose Club Ltd | London | 2025 |
| Composing AI Ltd | London | 2026 |
| Compound Arts Ltd | Birmingham | 2019 |
| Compound Coaching Ltd | Sheffield | 2023 |
| Compound CR Limited | Dumfries | 2023 |
| Compound Creations Limited | Hoddesdon | 2022 |
| Compound Creative Arts Ltd | Rochford | 2018 |
| Compound Glasgow Ltd | Glasgow | 2026 |
| Compound TC Ltd | Neath | 2025 |
| Compton Acres Limited | Poole | 2002 |
| Compton and Shawford Sports and Community Club Limited | Winchester | 2025 |
| Compton Care Lottery Limited | Wolverhampton | 1996 |
| Compton Communications Limited | London | 2007 |
| Compton's Glass Workshop Ltd | Trowbridge | 2014 |
| Comptons Tennis Club Limited | Horsham | 2011 |
| Compunity Ltd | Liverpool | 2025 |
| Computer Arts Archive CIC | Leicester | 2020 |
| Compy Comps Ltd | Broadstairs | 2025 |
| Comrie Leisure Limited | Coventry | 1997 |
| Comsept Ltd | Swindon | 2025 |
| Comunn Eachdraidh NIS | Isle Of Lewis | 2002 |
| Comyns Carr | London | 1996 |
| CON Alma CIC | Braunton | 2025 |
| CON MC Ltd | Craigavon | 2008 |
| Conah W Boxing Ltd | Dudley | 2025 |
| Conall Gormley Ltd | Manchester | 2021 |
| Conblock Ltd | Castleford | 2023 |
| Conbone Entertainment Ltd | Huntingdon | 2026 |
| Concaminchie Music Limited | Barnard Castle | 2011 |
| Concasarts Entertainment Company Limited | Wirral | 2016 |
| Concealnothing Ltd | Bury | 2019 |
| Conceived Music Management Limited | London | 2018 |
| Concentric Circles Theatre Company Ltd | Norwich | 2012 |