| Crizon Limited | Real estate | 2023 |
| Crlm Estates Limited | Real estate | 2020 |
| Crockers Property Management Limited | Administrative & support | 2007 |
| Crocketts Bar Exeter Ltd | Hospitality | 2023 |
| Crombie Stewart Limited | Professional & scientific | 2024 |
| Crongan Holdings Limited | Financial services | 2022 |
| Cronin's Consultancy Ltd | Professional & scientific | 2026 |
| Crook Enterprises Ltd | Financial services | 2024 |
| Cross Digital Ltd | Information & communication | 2016 |
| Crosse and Crosse LLP | | 2012 |
| Crossfit EXE Ltd | Arts & recreation | 2018 |
| Crosskeys Estate Agents Limited | Real estate | 2003 |
| Crosslands Developments Limited | Real estate | 2002 |
| Crouch Consultants Ltd | Professional & scientific | 2019 |
| Crowd Convert (Merac) Limited | Information & communication | 2024 |
| Crowd Convert Limited | Information & communication | 2025 |
| Crowland Catering Company Ltd | Hospitality | 2023 |
| Crown Square (Poundbury) Management Company Limited | Real estate | 2018 |
| Crownwood Property Investments Limited | Real estate | 2025 |
| Crowzon Builders Limited | Construction | 1967 |
| Crumby & Clayton Accountancy Services Ltd | Professional & scientific | 2020 |
| Crux Engineering Ltd | Professional & scientific | 2020 |
| Crypto Chester Ltd | Education | 2021 |
| Crystal Wave Properties Limited | Real estate | 2024 |
| Crystal Wave Property Sourcing Limited | Real estate | 2024 |
| Crystals (UK) Limited | Wholesale & retail | 2004 |
| CS Food & Wine Ltd | Wholesale & retail | 2015 |
| CS Leadwork & Roofing Limited | Construction | 2024 |
| CSD Groundworks and Building Contractors Ltd | Construction | 2012 |
| CSD Properties South West Ltd | Real estate | 2023 |
| CSL Construction Consultants Limited | Construction | 2018 |
| CSL Longstone Ltd | Real estate | 2026 |
| CSM Storage Solutions Ltd | Transport & logistics | 2025 |
| CSW Groundworks Limited | Construction | 2014 |
| CSW Group Limited | Education | 1995 |
| CSW Management Ltd | Professional & scientific | 2025 |
| CT Nails Ltd | Other services | 2026 |
| CT Service Station Ltd | Wholesale & retail | 2019 |
| Ctam Ltd | Information & communication | 2005 |
| CTC (Wholesalers) Holdings Limited | Financial services | 2018 |
| CTC (Wholesalers) Limited | Wholesale & retail | 1983 |
| CTJ & LK Limited | Hospitality | 2019 |
| CTW Detailing Ltd | Administrative & support | 2025 |
| CUB and KIT Films Limited | Information & communication | 2022 |
| Cuba Libre Ltd | Wholesale & retail | 2018 |
| Cube Digital Ltd | Information & communication | 2019 |
| Cuckoo Fibre Limited | Information & communication | 2023 |
| Cullompton Cricket & Recreational Club Limited | Arts & recreation | 2025 |
| Culture Chop Limited | Other services | 2024 |
| Culverland Court Management Company Limited | Households | 1983 |
| Cunniffe & Helm Ltd | Administrative & support | 2014 |
| Cunniffe & Helm Property Holdings Limited | Financial services | 2018 |
| Cunninghamdoodles Ltd | Agriculture & fishing | 2025 |
| CURETEK123 Limited | Health & social care | 2024 |
| Curium Systems Ltd | Information & communication | 2014 |
| Curran Builds Limited | Manufacturing | 2026 |
| Curtis Properties Exeter Ltd | Construction | 2026 |
| Curzon House Trustees Limited | Professional & scientific | 2003 |
| Custom Solar Solutions Limited | Manufacturing | 2021 |
| Customerwise Ltd | Administrative & support | 2015 |
| CVA Logistics Ltd | Transport & logistics | 2025 |
| CX Solved Limited | Information & communication | 2025 |
| CY GOH Limited | Wholesale & retail | 2025 |
| Cyber Techwave Ltd | Construction | 2023 |
| Cyber TOM DOT COM Ltd. | Information & communication | 2017 |
| Cybernetic Solutions Ltd | Professional & scientific | 2021 |
| Cyberstaff Ltd | Information & communication | 2025 |
| Cygnet Court (Exeter) Company Limited | Households | 2009 |
| Cygnet Training Theatre & Cygnet Research Library | Arts & recreation | 2000 |
| CZ. Sniper Trans Ltd | Transport & logistics | 2025 |
| D & B Marine Ltd | Transport & logistics | 2014 |
| D & C Property (Devon) Limited | Construction | 2012 |
| D & D Investigations LLP | | 2022 |
| D & J Developments (SW) Ltd | Financial services | 2024 |
| D and a Developement Limited | Real estate | 2024 |
| D and L Roofing Ltd | Construction | 2024 |
| D and P Reinforcements Ltd | Construction | 1998 |
| D and R Design Limited | Construction | 2009 |
| D B Investment Property Limited | Construction | 2017 |
| D C Accounting Ltd | Professional & scientific | 2007 |
| D C Britton Construction Ltd | Construction | 2005 |
| D G I Interiors Limited | Construction | 2012 |
| D H Fragrance 2025 Ltd | Wholesale & retail | 2025 |
| D J H Roofing Ltd | Construction | 2003 |
| D King Livestock Limited | Agriculture & fishing | 2018 |
| D L Tucker Drylining Limited | Construction | 2015 |
| D P C Brickwork Ltd | Construction | 2023 |
| D Q Boats Limited | Agriculture & fishing | 2009 |
| D Q Holdings Limited | Real estate | 2024 |
| D R Dodd Ltd | Construction | 2014 |
| D W Solutions Exeter Ltd | Construction | 2014 |
| D&A Squeaky Clean Ltd | Administrative & support | 2025 |
| D&E Horse Transport Ltd | Transport & logistics | 2024 |
| D&G Property One Ltd | Households | 2024 |
| D&Mbt Ltd | Professional & scientific | 2019 |
| D&N Hancock Limited | Real estate | 2021 |
| D&R Associates (London) Limited | Professional & scientific | 2015 |
| D&Sb Property Ltd | Real estate | 2021 |
| D&Sj Property Ltd | Households | 2025 |
| D-Max Fire Ltd | Construction | 2025 |