| Cunningham Audio Productions Limited | South Queensferry | 1993 |
| Cunningham Piano Services Limited | Shipley | 2003 |
| Cunswick Sporting Ltd | Wigan | 2020 |
| CUP & Ltd | London | 2018 |
| CUP Creative Limited | London | 2019 |
| CUP of Ambition Marketing Ltd | London | 2026 |
| CUP of Jojo Ltd | Woking | 2019 |
| Cupboard Studios Ltd | Saint Leonards-On-Sea | 2020 |
| Cupcake Kangaroo Ltd | High Wycombe | 2025 |
| Cupello Limited | Epsom | 2019 |
| Cupid + Thorn Ltd | London | 2022 |
| Cupid's Health Club Limited | Leigh | 2020 |
| Cupid's Wedding Shows Limited | | 2006 |
| Cupola Contemporary Art (South Yorkshire) Limited | Sheffield | 2009 |
| Cupola Contemporary Art Ltd | South Yorkshire | 2004 |
| Cuppapug Brighton Limited | London | 2026 |
| Cuppapug Scotland Limited | Edinburgh | 2026 |
| Cupple Limited | Keston | 2016 |
| Cups on Strings Limited | Stoke-On-Trent | 2026 |
| Cura Art Limited | Brentwood | 2019 |
| Cura Nostra Ltd | Sheffield | 2012 |
| Cura Therapy Ltd | High Wycombe | 2025 |
| Curadh Performance Ltd | London | 2018 |
| Curate a Day Ltd | London | 2026 |
| Curated Curiosity Ltd | Maidenhead | 2025 |
| Curated Essence & Co Ltd. | Peterborough | 2024 |
| Curated Events Ltd | Leicester | 2025 |
| Curated JIU Jitsu Limited | Holmfirth | 2020 |
| Curating a New Normal Ltd | London | 2018 |
| Curatus Arts Limited | York | 2023 |
| Curatus Experiences Limited | Stamford | 2025 |
| Cure Music International Limited | Potters Bar | 2010 |
| Cure Retreats Limited | London | 2025 |
| Curerstuff Ltd | Potters Bar | 2010 |
| Curfew London Ltd | London | 2025 |
| Curfu | Cambridge | 2016 |
| Curio Blocks Ltd | Margate | 2013 |
| Curio Exhibitions Ltd | London | 2025 |
| Curios Theatre Ltd | London | 2026 |
| Curiositas Limited | Fokestone | 2011 |
| Curiosity 360 Productions Limited | Yelverton | 2017 |
| Curiosity Corner Play Limited | Chorley | 2019 |
| Curiosity Creative C.I.C. | North Shields | 2012 |
| Curious Arts | Hartlepool | 2017 |
| Curious Charms Ltd | Oldham | 2015 |
| Curious Crafty CIC | Manchester | 2019 |
| Curious Devices Ltd | London | 2018 |
| Curious Directive | Norwich | 2010 |
| Curious EAR CIC | Manchester | 2023 |
| Curious Energy Ltd | London | 2026 |
| Curious Fabrication Ltd | Glasgow | 2023 |
| Curious Fitness Ltd | Bath | 2019 |
| Curious Inklings Ltd | Cardiff | 2021 |
| Curious Laboratories Ltd | Bodmin | 2018 |
| Curious Motion CIC | Halifax | 2019 |
| Curious Nottingham Ltd | Nottingham | 2016 |
| Curious Pheasant Theatre Limited | Ferndown | 2017 |
| Curious Space Ltd | Blackburn | 2012 |
| Curious World Limited | Rotherham | 2022 |
| Curious Yellow Events Ltd | Leeds | 2022 |
| Curiouser and Curiouser Consultancy Ltd | London | 2020 |
| Curiousity by Lilian Bach Ltd | London | 2023 |
| Curl 22 Limited | Blair Atholl | 2012 |
| Curl Aberdeen Ltd | Aberdeen | 2016 |
| Curl Ayrshire Charity | Ayr | 2024 |
| Curl Fitness Centre Limited | Pentre | 2026 |
| Curl Girl Productions CIC | West Bromwich | 2024 |
| Curl of Duty Limited | Hoddesdon | 2022 |
| Curlew Productions Limited | Chichester | 2017 |
| Curlew Rowing Club Limited(The) | Greenwich | 1982 |
| Curling Stadium Europe Ltd | Lockerbie | 2023 |
| Curly COW Design Limited | Ascot | 2024 |
| Curly Red SAM Art Ltd | Bristol | 2025 |
| Curly Riot Ltd | Enfield | 2014 |
| Curly Whirleez Bolton Limited | Bolton | 2018 |
| Curly's Athletes Limited | Scunthorpe | 2016 |
| Curmudgeons Consolidated Limited | London | 2015 |
| Curran Fitness Ltd | Denny | 2025 |
| Currie Jones Associates Limited | High Peak | 1992 |
| Currie Ltd | Manchester | 2022 |
| Currie Productions Limited | Edinburgh | 2024 |
| Currie Rugby Football Club Limited | Balerno | 2017 |
| Curry's Amusements Ltd | Londonderry | 2014 |
| Cursed Competitions Limited | Stratford-Upon-Avon | 2022 |
| Cursed Tales Ltd | Rossendale | 2021 |
| Cursing and Sobbing Limited | London | 2011 |
| Curtain Call Creative Ltd | Cowes | 2020 |
| Curtain Call Limited | Gloucester | 2022 |
| Curtain Call Studios Ltd | Shrewsbury | 2024 |
| Curtain Twitchers Theatre & Co Ltd | London | 2022 |
| Curtain UP Productions Ltd | Leeds | 2024 |
| Curtain UP Theatre Company Ltd | Barry | 2023 |
| Curtains for Radio Ltd | London | 2013 |
| Curtin & Co Creations Limited | Saffron Walden | 2025 |
| Curtis Creations Ltd | Sawbridgeworth | 2019 |
| Curtis Hutson Legacy Foundation CIC | Reading | 2023 |
| Curtis Sport Ltd | Lichfield | 2014 |
| Curtz Ltd | Cardiff | 2017 |
| Curufc | Cambridge | 2015 |
| Curva Spine Ltd | Leighton Buzzard | 2020 |