| Cook Group Holdings Limited | Professional & scientific | 2026 |
| Coombend (Radstock) Management Limited | Households | 2018 |
| Coombend Auto Electrical Limited | Wholesale & retail | 2005 |
| Core Pilates (UK) Ltd | Arts & recreation | 2013 |
| Core Potential Ltd | Professional & scientific | 2021 |
| Cork and Bottle Ltd | Hospitality | 2015 |
| Corners Hair Studio Limited | Other services | 2016 |
| Cornucopic Limited | Information & communication | 2012 |
| Corporate Cleaning South-West Ltd | Extraterritorial | 2020 |
| Country Life Stores Ltd | Wholesale & retail | 2018 |
| Countrywide Furniture Limited | Other services | 2012 |
| Court Farm Rehabilitation Ltd | Agriculture & fishing | 2023 |
| Cowin Global UK Limited | Manufacturing | 2015 |
| Cowin Global UK Management Ltd | Administrative & support | 2020 |
| Cowstruction Ltd | Agriculture & fishing | 2023 |
| Cozy Knights YMK Ltd | Hospitality | 2026 |
| CP Plumbing & Heating (SW) Ltd | Administrative & support | 2017 |
| CR Collective Ltd | Arts & recreation | 2023 |
| Crab Rock Management Company Limited | Real estate | 2006 |
| Craig Rice School Sports Services Limited | Education | 2011 |
| Craig Rogers Plumbing and Heating Ltd | Construction | 2019 |
| CRB Plumbing and Heating Ltd | Construction | 2019 |
| Create Display Limited | Construction | 2006 |
| Creative International Ltd | Information & communication | 2017 |
| Creative White Rabbit Limited | Construction | 2023 |
| Crimson Land Holdings Limited | Construction | 2009 |
| Crokey Ltd | Manufacturing | 2025 |
| Crossways Tavern Limited | Hospitality | 2005 |
| Crown Car Care MOT Centre Limited | Wholesale & retail | 2010 |
| Crown Inn Leisure Ltd | Hospitality | 2007 |
| Cruse Construction Ltd | Construction | 2020 |
| CRW Holdings Limited | Financial services | 2018 |
| Crystal Construction Limited | Construction | 1995 |
| CS Carpentry Southwest Ltd | Construction | 2024 |
| CSH Planning Consultants Limited | Professional & scientific | 2017 |
| Csolar Ltd | Construction | 2023 |
| CSR Consult Ltd | Professional & scientific | 2024 |
| Ctrlaltalex Ltd | Information & communication | 2025 |
| Culture Stretch Limited | Professional & scientific | 2019 |
| Curated - Wedding & Event Hire Limited | Administrative & support | 2024 |
| Curiositree Ltd | Education | 2026 |
| Curious Minds With Rhiannon Mitchell Ltd | Wholesale & retail | 2025 |
| Curtain UP Theatre School Limited | Education | 2013 |
| Curtis Ilott (BFS) Limited | Other services | 2017 |
| Curtis Partitioning Limited | Construction | 2004 |
| Cvps Bristol Ltd | Construction | 2025 |
| D & CC Holdings Limited | Financial services | 2018 |
| D & D Developments (Somerset) Ltd | Construction | 2021 |
| D & G Network Solutions Ltd | Information & communication | 2012 |
| D & J Storage Solutions Limited | Transport & logistics | 2012 |
| D C Welding Services (Sunderland) Ltd | Construction | 2011 |
| D Metcalf Electrical Limited | Construction | 2012 |
| D&S Design Ltd | Professional & scientific | 2024 |
| D.O. Construction Somerset Limited | Construction | 2022 |
| D.O. Ground Works Ltd | Construction | 2025 |
| Dablin Limited | Real estate | 1973 |
| Dainscot Limited | Hospitality | 2023 |
| Dalumi Services Ltd | Professional & scientific | 2021 |
| Daly Lettings Ltd | Real estate | 2024 |
| Dando Developments Limited | Construction | 2016 |
| Dani Evans Equine Sales Ltd | Agriculture & fishing | 2020 |
| Danny Moxham Ltd | Other services | 2023 |
| Dantom Structural Detailing Limited | Construction | 2017 |
| Dark Construction Solutions Ltd | Construction | 2026 |
| Darkhouse Enterprises Ltd | Financial services | 2025 |
| Darren Wilkins Electrical Contractors Limited | Construction | 2001 |
| Datum Precision Engineering Limited | Manufacturing | 1995 |
| Dave Addicott Engineering Limited | Manufacturing | 2005 |
| Dave Fishlock Properties Limited | Construction | 2003 |
| Dave Fowler's Garage Limited | Wholesale & retail | 2003 |
| Dave Rees Mortgages Limited | Financial services | 2020 |
| David Anthony Mullins Ltd | Real estate | 2012 |
| David Brooker Limited | Information & communication | 2012 |
| David Cole Design Ltd | Professional & scientific | 2023 |
| DCN Engineering Ltd | Manufacturing | 2022 |
| DCS Exclusive Vehicles Limited | Wholesale & retail | 2018 |
| Ddglen Holdings Ltd | Financial services | 2024 |
| DE Electrical Ltd. | Manufacturing | 2014 |
| Deacon Software Ltd | Information & communication | 2022 |
| Dead Inc Ltd | Wholesale & retail | 2024 |
| Decalforge Ltd | Professional & scientific | 2025 |
| Decors and Home Limited | Wholesale & retail | 2025 |
| Deep Logic Solutions Ltd | Information & communication | 2010 |
| Deere & Co Ltd | Wholesale & retail | 2026 |
| Dekl Ltd | Professional & scientific | 2023 |
| Dell Investment Securities Limited | Real estate | 2008 |
| Denning Plastering Ltd | Construction | 2022 |
| Deori Labs Ltd | Information & communication | 2022 |
| Design Labyrinth Limited | Information & communication | 2025 |
| Designit Marketplace Ltd | Information & communication | 2026 |
| Detail Engineering Ltd | Professional & scientific | 2017 |
| Detox DEN Ltd | Health & social care | 2024 |
| Dfkr Consulting Limited | Professional & scientific | 2021 |
| DGM Fencing and Landscaping Ltd | Administrative & support | 2026 |
| DGR7 Limited | Real estate | 2020 |
| Dial IT & Drive Limited | Wholesale & retail | 1995 |
| Dialogue Language Training Limited | Education | 2021 |
| Diamond Dental Limited | Health & social care | 2010 |
| Diamond Scissors CUT Barber Ltd | Other services | 2024 |
| Digima Limited | Energy | 2008 |