| Cheap Feeds Limited | Manufacturing | 2018 |
| Chebrew Coffee Ltd | Hospitality | 2025 |
| Chequers Close (Management Co.) Limited | Households | 1995 |
| Cherizena Limited | Wholesale & retail | 2001 |
| Chesapeake Associates Limited | Professional & scientific | 2003 |
| Chesterfield Refurb Co Limited | Other services | 2014 |
| Children's Bereavement Centre | Health & social care | 2003 |
| Chilli HUT (Newark) Ltd | Hospitality | 2019 |
| Chillibobs Ltd | Manufacturing | 2013 |
| Chilly HUT Ltd | Hospitality | 2026 |
| Chimera Capital Ltd | Real estate | 2024 |
| China City Food Limited | Hospitality | 2021 |
| Chiocchi PT Ltd | Other services | 2024 |
| Chipmonkz Media Ltd | Information & communication | 2019 |
| Chiselling Consultancy Ltd | Professional & scientific | 2019 |
| Chloe Christine Digital Limited | Information & communication | 2024 |
| Chris Banks Limited | Manufacturing | 2003 |
| Chris Goode Building Solutions Limited | Construction | 2016 |
| Chris Haynes Roofing Ltd | Construction | 2020 |
| Chris King Joinery Limited | Construction | 2016 |
| Chris Mansfield Property Ltd | Real estate | 2025 |
| Christiana CC Ltd | Health & social care | 2019 |
| Chubb Hill Court (Management) Limited | Households | 2016 |
| Cigar Box Swimwear Ltd | Professional & scientific | 2025 |
| Cinar Kebab Limited | Hospitality | 2018 |
| Cinder Rose Limited | Information & communication | 2012 |
| Cipros Ltd | Public administration | 2014 |
| CIRCUIT78 Limited | Wholesale & retail | 2021 |
| Circulai Limited | Water & waste | 2023 |
| Citizen Associates Limited | Professional & scientific | 2011 |
| Citizen Equity Limited | Professional & scientific | 2011 |
| City Goldsmiths (Nottingham) Ltd | Wholesale & retail | 2011 |
| City Outdoor Living Ltd | Construction | 2023 |
| City Presentations Limited | Financial services | 1995 |
| City.S.P.D Ltd | Manufacturing | 2023 |
| CJW Motorsport Limited | Wholesale & retail | 2026 |
| CK Plumbing & Environmental Services Ltd | Professional & scientific | 2019 |
| Cladding Connexions Ltd | Construction | 2007 |
| Claisse Motor Trade Ltd | Wholesale & retail | 2025 |
| Clarendon Logistics Limited | Information & communication | 2026 |
| Clarity Business Management Ltd | Administrative & support | 2019 |
| Clarity Window Cleaning Services (Notts) Ltd | Administrative & support | 2021 |
| Clarkewall Limited | Administrative & support | 2024 |
| Clatums Trading Limited | Wholesale & retail | 2019 |
| Clay Trade Ltd | Wholesale & retail | 2014 |
| Clayton & Wrench Properties Ltd | Real estate | 2026 |
| Clayton (Lincoln) Limited | Real estate | 1975 |
| CLB Haulage Ltd | Transport & logistics | 2021 |
| Cleanroom Solutions and Services Ltd | Construction | 2022 |
| Clear Grow Ltd | Administrative & support | 2025 |
| Clearmoon Limited | Administrative & support | 2011 |
| Clearwell Asset Management Ltd | Professional & scientific | 2013 |
| Clements Bros Ltd | Construction | 2022 |
| Cleota Private Limited | Health & social care | 2014 |
| Cliff Telecommunications Limited | Information & communication | 2000 |
| Clifford Energy Limited | Construction | 2015 |
| Clifford Heating Limited | Construction | 2011 |
| Clifford Sporting Ltd | Agriculture & fishing | 2017 |
| Clima Associates Limited | Administrative & support | 2022 |
| Clinton Gardens LLP | | 2015 |
| Clipstone Recruitment Ltd | Administrative & support | 2026 |
| Clissold Property Ltd | Real estate | 2018 |
| Clive Consulting Limited | Professional & scientific | 2023 |
| CLM Capital Limited | Financial services | 2013 |
| Clouds and Code Ltd | Information & communication | 2022 |
| Cloudwick Technologies UK | | 2015 |
| Clover Four Properties Ltd | Real estate | 2013 |
| CLS Installations Ltd | Construction | 2019 |
| Clubspa UK Ltd | Administrative & support | 2025 |
| Clumber Classics and Customs Ltd | Wholesale & retail | 2016 |
| Clydesdale and Mortimer Property Management Services Ltd | Real estate | 2025 |
| CM Associates (UK) Limited | Administrative & support | 2006 |
| Cmbd Consultancy Ltd | Administrative & support | 2021 |
| CMP Trading Room Ltd | Information & communication | 2023 |
| Coachedby Limited | Information & communication | 2025 |
| Coachpainters Limited | Wholesale & retail | 2022 |
| Cobie & Co Consultancy Ltd | Administrative & support | 2023 |
| Cobra KOI Ltd | Wholesale & retail | 2024 |
| Cocktails Inc. Ltd | Wholesale & retail | 2022 |
| Coddington Plough Limited | Hospitality | 2016 |
| Code Fitness Limited | Arts & recreation | 2013 |
| Codecheck Systems Limited | Information & communication | 1997 |
| Coinager Solutions Ltd | Information & communication | 2015 |
| Cole EQ Limited | Extraterritorial | 2021 |
| Collectwithchlo Ltd | Wholesale & retail | 2025 |
| Collingham and District Agricultural Society | Agriculture & fishing | 1993 |
| Collingham Brook Management Company Ltd | Households | 2017 |
| Collingham C2 Land Management Company Ltd | Households | 2017 |
| Collingham Commercials Ltd | Wholesale & retail | 2024 |
| Collingham Community Trust Limited | Other services | 2001 |
| Collingham Supplies Limited | Wholesale & retail | 1997 |
| Colmar Developments Limited | Real estate | 2003 |
| Community Inclusive Trust | Education | 2014 |
| Compass Retail Enterprises Ltd | Wholesale & retail | 2021 |
| Compleat Transformations Limited | Professional & scientific | 2021 |
| Complesso Limited | Health & social care | 2015 |
| Complete Builders (Lincs) Limited | Construction | 2019 |
| Complete Sheq Ltd | Professional & scientific | 2014 |
| Complitas Technology Limited | Information & communication | 2026 |
| COMPOUNDS4LET Ltd | Real estate | 2021 |