| Chykestallion Logistics Ltd | Wholesale & retail | 2026 |
| CI Financial Holdings Ltd. | Financial services | 2025 |
| CI Implementation Limited | Arts & recreation | 2018 |
| Ciao Bella Aesthetics Limited | Other services | 2018 |
| Ciao Bologna Limited | Hospitality | 2019 |
| Ciao Bristol Ltd | Hospitality | 2020 |
| Ciao Burger Limited | Hospitality | 2003 |
| Cibc (10OS) Limited | Real estate | 2021 |
| Cibc Offices Limited | Real estate | 2014 |
| Cibo Continental Limited | Real estate | 1986 |
| Cibo Developments Limited | Construction | 2023 |
| Cibo Holdings Limited | Financial services | 2023 |
| Cibo Properties Limited | Construction | 2023 |
| Ciccio's Kitchen Ltd | Hospitality | 2018 |
| Cider House Properties Limited | Real estate | 2025 |
| Cider Press Plymouth Limited | Hospitality | 2021 |
| Ciderhead Ltd | Manufacturing | 2019 |
| Ciel Consulting Ltd | Professional & scientific | 2012 |
| Cierto Ltd | Professional & scientific | 2026 |
| CIG SW Ltd | Construction | 2021 |
| Cigar Factory Apartments Limited | Real estate | 2018 |
| Cilo Innovations Ltd | Information & communication | 2020 |
| Cimpa Limited | Information & communication | 2003 |
| Cimpor UK Limited | Wholesale & retail | 2024 |
| Cinal Ltd | Health & social care | 2015 |
| Cinaz Limited | Hospitality | 2025 |
| Cinc Consulting Limited | Information & communication | 2017 |
| Cinderella's Team Cleaning Service LLP | | 2025 |
| Cinegy Limited | Information & communication | 2010 |
| Cinelux Ltd | Manufacturing | 2023 |
| Cinemaworks Ltd | Wholesale & retail | 2022 |
| Cinemetix Solutions Limited | Information & communication | 2025 |
| Cinerpg CIC | Information & communication | 2024 |
| Cinevra Studio Ltd | Information & communication | 2026 |
| Cinibom Limited Partnership | | 2018 |
| Cinnamon Holistic Massage Ltd | Health & social care | 2023 |
| Cinnamon Keynsham Limited | Wholesale & retail | 2020 |
| Cino’S Ltd | Hospitality | 2022 |
| Cintek Limited | Professional & scientific | 2016 |
| Cintra Corporation UK Limited | Information & communication | 2000 |
| Cintre | Health & social care | 1980 |
| Cioco Mego DUT Ltd | Transport & logistics | 2026 |
| CIP Recovary Limited | Wholesale & retail | 2026 |
| Cipher Hunt Ltd | Financial services | 2007 |
| Cipherme Technology Ltd | Wholesale & retail | 2017 |
| Circa 5 Limited | Administrative & support | 2015 |
| Circadian BTS Limited | Other services | 2025 |
| Circadian Nest Nursery Limited | Education | 2025 |
| Circadian Rhythms World Wide Limited | Professional & scientific | 2017 |
| Circadian Trust | Arts & recreation | 2005 |
| Circle Bidco Limited | Financial services | 2021 |
| Circle Construct Group Ltd | Financial services | 2025 |
| Circle Electrical Ltd | Construction | 2018 |
| Circle Interactive Ltd | Information & communication | 2005 |
| Circle Midco 1 Limited | Financial services | 2021 |
| Circle Midco 2 Limited | Financial services | 2021 |
| Circle Squared Ltd | Real estate | 2018 |
| Circle Theatre Ltd | Arts & recreation | 2019 |
| Circle Topco Limited | Financial services | 2021 |
| Circlera Limited | Information & communication | 2018 |
| Circles Events Ltd | Hospitality | 2025 |
| Circomedia Enterprises Ltd | Arts & recreation | 2008 |
| Circuit Break Retreats Limited | Other services | 2023 |
| Circuitry Ltd | Wholesale & retail | 2024 |
| CIRCUL8TION Ltd | Professional & scientific | 2024 |
| Circulairity Ltd | Information & communication | 2022 |
| Circular Artspace CIC | Wholesale & retail | 2022 |
| Circular Climbing Collective CIC | Arts & recreation | 2024 |
| Circular Composites Ltd | Professional & scientific | 2023 |
| Circular Productions Ltd | Hospitality | 2016 |
| Circular Waste Solutions Limited | Water & waste | 2019 |
| Circus Antics Ltd | Arts & recreation | 2025 |
| Circus Smith Ltd | Education | 2025 |
| Circus Software Solutions Ltd | Information & communication | 2014 |
| Circusbb Ltd | Extraterritorial | 2020 |
| Cirencester CG Limited | Health & social care | 2025 |
| Cirqqle Ltd | Information & communication | 2025 |
| Cirque Bijou Limited | Arts & recreation | 2004 |
| Cirrus Core Networks UK Ltd | Information & communication | 2022 |
| Cirrus Inns Holdings Limited | Hospitality | 2011 |
| Cirrus Inns Limited | Hospitality | 2011 |
| Cirrus Kitchens Ltd | Hospitality | 2023 |
| CIRU26 Ltd | Health & social care | 2017 |
| CIS Properties Limited | Extraterritorial | 1983 |
| Cistaxreturns.Co.Uk Limited | Professional & scientific | 2009 |
| Citadel Maritime Limited | Administrative & support | 2011 |
| Citadel Source Limited | Administrative & support | 2023 |
| Citizen Medtech Ltd | Professional & scientific | 2024 |
| Citizens Advice South Gloucestershire | Health & social care | 1992 |
| Citoruha Limited | Health & social care | 2017 |
| Citric Acid Productions Limited | Arts & recreation | 2007 |
| Citrus Digital Limited | Extraterritorial | 2009 |
| Citrus Projects Ltd. | Education | 2013 |
| Citrus Research Limited | Information & communication | 2010 |
| City & Coast Property Limited | Real estate | 2017 |
| City & West END Properties Limited | Construction | 2009 |
| City Academy Bristol Trading Limited | Real estate | 2005 |
| City Adverts Ltd | Professional & scientific | 2017 |
| City and County of Bristol Indoor Bowls Club Limited(The) | Arts & recreation | 1984 |
| City Boxes Limited | Real estate | 2012 |