| Catalyzt Limited | Hull | 2023 |
| Catapult Design Limited | Lytham St. Annes | 2002 |
| Catapult Theatre London Ltd | London | 2022 |
| Catcher Media Limited | Hereford | 2006 |
| Catching Bees Ltd | London | 2024 |
| Catchpoint Security Ltd | Blackburn | 2023 |
| Catchpro Limited | Manchester | 2008 |
| Catchum 88 Limited | Burnham | 1988 |
| Catchymonkey Ltd | Lymington | 2003 |
| Category Driver Limited | Wisbech | 2023 |
| Catenae Innovation Ltd | London | 2023 |
| Cater Allen Holdings Limited | London | 1943 |
| Cater Allen International Limited | London | 1991 |
| Cater Allen Syndicate Management Limited | London | 1991 |
| Cater Clean 24SEVEN Ltd | Saffron Walden | 2011 |
| Cater Waste Holdings Limited | Toomebridge | 2010 |
| Cater-Kwik Investments Limited | Ulverston | 2016 |
| Caterbe Plant Sales Ltd | London | 2024 |
| Catercheck Holdings Limited | Norwich | 1999 |
| Caterclad Limited | Cranbrook | 2002 |
| Caterexchange Limited | Rubery Birmingham | 1984 |
| Caterflow AI Limited | Cheltenham | 2025 |
| Caterfresh Limited | Buxton | 2011 |
| Caterham Fireplaces Limited | Stoke-On-Trent | 2004 |
| Caterinello Limited | Rochdale | 2016 |
| Catering & KOK Limited | London | 2020 |
| Catering Equipment Clearance Limited | Peterborough | 2012 |
| Catering Parts (UK) Limited | Wakefield | 2006 |
| Catering Productions Limited | Lewes | 2014 |
| Cateron Ltd | Gloucester | 2025 |
| Caterpillar Pension Trust Limited | Peterborough | 2000 |
| Caterpillar UK Employee Trust Limited | Leicester | 2000 |
| Caterpillar UK Group Limited | Peterborough | 2005 |
| Caters Media Group Limited | Birkenhead | 2015 |
| Caterskill Group Limited | Rubery | 1987 |
| Caterskill Management Limited | Rubery Birmingham | 1986 |
| Caterways Limited | Birmingham | 2002 |
| Catfoss DBT Limited | Driffield | 2018 |
| Catfoss Renewable Energy Limited | Beverley | 2018 |
| Catharsis Publishing Limited | Polegate | 2011 |
| Cathay Foods Limited | Middlesex | 2006 |
| Cathay Industrial Ltd | Manchester | 2012 |
| Cathcart Ltd | London | 2025 |
| Cathedral Court (Llandaff) Limited | Cardiff | 1997 |
| Cathedral Flooring Limited | Romford | 2004 |
| Cathedral Funeral Services (ELY) Limited | Bishop'S Stortford | 1997 |
| Cathedral Park Management Company Limited | Wells | 2008 |
| Cathedral Turf Limited | Durham | 2005 |
| Cathedral View Management Company Limited | Belfast | 2007 |
| Catherine Farm Investments Limited | Brighouse | 2007 |
| Catherine FAY Edwards Ltd Ltd | Newark | 2024 |
| Catherine MAY Hannaford Ltd | Gillingham | 2025 |
| Catherine Sharon Hughes Ltd | Neath | 2022 |
| Catherine Street 1967 Limited | Wymeswold | 2014 |
| Cathesolo Healthcare Ltd | Milton Keynes | 2022 |
| Cathy Industrial & Trade Co., Ltd | Beckenham | 2021 |
| Cation IT Consulting Limited | Edinburgh | 2014 |
| Catley Brothers Limited | Frome | 2013 |
| Catmj Limited | Newmarket | 2012 |
| Cator Estate (Beckenham) Limited | Surrey | 1991 |
| Catriona Miranda Joy Mclean Ltd | Petersfield | 2022 |
| Catrisa Ltd | Weston-Super-Mare | 2020 |
| Cats and Owls Ltd | Manchester | 2025 |
| Catsec 401 Limited | London | 1994 |
| Catter Properties (Scotland) Limited | Glasgow | 2012 |
| Cattlin Consulting Limited | London | 2023 |
| Cattogs Lane Residents Limited | Newtownards | 2008 |
| Cattol Ltd | Romsey | 2024 |
| Catton Properties (Isle of Wight) Limited | Solihull | 2006 |
| Catvisa Ltd | Weston-Super-Mare | 2020 |
| Catwalk Nearly New Ltd | London | 2021 |
| Catwalking Limited | Hexham | 2000 |
| Caught Lookin Limited | London | 2024 |
| Caulfield Search (Europe) Ltd. | Woking | 2015 |
| Caunters Solicitors Limited | Liskeard | 2008 |
| Cause & Effect Media Limited | Nottingham | 2013 |
| Cause and Effect Publicity Ltd | Gateshead | 2010 |
| Causeway Coast Projects Limited | Coleraine | 2016 |
| Causeway Garage Wiltshire Limited | Trowbridge | 1991 |
| Causeway Home Improvement Group Limited | Warrington | 2016 |
| Causeway Lofts Management Ltd | Portstewart | 2014 |
| Cautionary Tale C.I.C. | Penzance | 2023 |
| Cavaland Limited | St Albans | 1986 |
| Cavalier Bathrooms Limited | Leicestershire | 2012 |
| Cavalier Smart Security Ltd | Milton Keynes | 2023 |
| Cavallone Integrated Public Services Group Limited | London | 2024 |
| Cavalok Building Products Limited | Alfreton | 2008 |
| Cavalry Design Limited | Nottingham | 2024 |
| Cavani Furniture Ltd | Nottingham | 2011 |
| Cavanna Developments Limited | Nicholson Road Torquay | 2001 |
| Cavanna Holiday Camp Limited | Nicholson Road Torquay | 1961 |
| Cavatore Limited | London | 2012 |
| Cavco Limited | Sutton | 1990 |
| Cave 1972 Limited | Ossett | 2014 |
| Cave Industries Ltd | London | 2010 |
| Cave Innovations Limited | Spennymoor | 2011 |
| Cave Projects Ltd | London | 2022 |
| Cave Worldwide Limited | Tunbridge Wells | 2004 |
| Caveat UK Ltd | Norwich | 2025 |
| Cavegn Ltd | London | 2023 |