| Corsham Properties Limited | Households | 2022 |
| Corsham Science Limited | Administrative & support | 2018 |
| Corshambaptists@Rudloe Limited | Other services | 2025 |
| Cotswold E-Commerce Ltd | Wholesale & retail | 2022 |
| CRB Engineering Ltd | Manufacturing | 2013 |
| Cre@Te Limited | Professional & scientific | 2026 |
| Creative Ceramic Art Limited | Health & social care | 2012 |
| Cricklade Manor Prep Limited | Education | 2014 |
| Critical Digital Limited | Professional & scientific | 2013 |
| Crossroads Farm Cottages Limited | Real estate | 2013 |
| Crossways Flats (Box) Limited | Households | 1973 |
| Crown Hosting Data Centres Limited | Real estate | 2014 |
| Curious Robin Limited | Professional & scientific | 2022 |
| Cyan Ltd | Information & communication | 2023 |
| Cyber FLO Limited | Information & communication | 2024 |
| Cybertech SG Ltd | Information & communication | 2024 |
| Cybervio Ltd | Information & communication | 2019 |
| D J Mathias Limited | Construction | 2003 |
| D.J.Doherty Ltd | Professional & scientific | 2022 |
| Dafo Creative Ltd | Information & communication | 2022 |
| DAL Mortgages Limited | Financial services | 2021 |
| Dandelion Coffee House Ltd | Hospitality | 2020 |
| Dartmouth Partnership | | 1997 |
| Dave Steer (Dilligaf) Limited | Administrative & support | 2017 |
| David Ayling Goldsmith Ltd | Manufacturing | 2015 |
| David B Consulting Ltd | Professional & scientific | 2023 |
| Davis Property Renovation Ltd | Construction | 2017 |
| Deltaflow Water Solutions Ltd | Professional & scientific | 2025 |
| Dental Recruit Network Limited | Administrative & support | 2012 |
| Design Boutique London Ltd | Professional & scientific | 2015 |
| Design in Focus Ltd | Information & communication | 2018 |
| Devitt Property Ltd | Real estate | 2025 |
| Diamond Divas Beauty Limited | Other services | 2012 |
| Digital Valour Ltd | Administrative & support | 2018 |
| Dinger Dismantlers Limited | Wholesale & retail | 2025 |
| Discovery Global Trade Ltd | Wholesale & retail | 2021 |
| DJH Agri Ltd | Manufacturing | 2026 |
| Dkkj Property Ltd | Real estate | 2024 |
| DL Digital Solutions Ltd | Information & communication | 2025 |
| DN Stats Consultancy Ltd | Professional & scientific | 2012 |
| DNA Plan Limited | Health & social care | 2018 |
| Doctors Hill Ltd | Financial services | 2023 |
| Dolphin Hotel (Swindon) Limited | Wholesale & retail | 2003 |
| Doorfarm Residents Association Limited | Households | 1984 |
| Dovetail Building Consultants Ltd. | Professional & scientific | 2013 |
| Downscote Property Management Limited | Households | 1987 |
| DPR Broomfield Farm Limited | Construction | 2023 |
| Dqar Limited | Other services | 2015 |
| DR. Sabrina Group Limited | Professional & scientific | 2022 |
| DR. Sabrina Limited | Wholesale & retail | 2020 |
| Driven Automotive Media Ltd | Professional & scientific | 2017 |
| Driving Jobs UK (Bristol) Ltd | Other services | 2019 |
| Drumsand Ltd | Information & communication | 2024 |
| Duncliffe View Property Management (NO 2) Limited | Households | 1997 |
| Duodecim Residents Management Company Limited | Households | 2008 |
| Dusky Moon Limited | Wholesale & retail | 2007 |
| Easton Farm Limited | Agriculture & fishing | 2001 |
| Eaton House Interiors Ltd | Wholesale & retail | 2026 |
| Ebeni Limited | Information & communication | 2004 |
| Ebmcsquared CIC | Professional & scientific | 2021 |
| Echo Squad Ltd | Real estate | 2023 |
| Eclat Events Ltd. | Administrative & support | 2010 |
| Edge Forecast Limited | Professional & scientific | 2019 |
| Ejpb Limited | Manufacturing | 2023 |
| Elarni Limited | Real estate | 2024 |
| Eldridge Consulting Limited | Information & communication | 2011 |
| Electraction (N.I.) Limited | | 1998 |
| Emily Cadwallader Ltd | Professional & scientific | 2019 |
| Emily Day Interiors Ltd | Professional & scientific | 2024 |
| Empathy Care Limited | Health & social care | 2011 |
| Employment Law Week Limited | Extraterritorial | 2021 |
| Empowered Projects Ltd | Professional & scientific | 2019 |
| Endeavour Interiors Limited | Construction | 2025 |
| Enfield Villa Consulting Limited | Professional & scientific | 2014 |
| Enfusion Ltd | Professional & scientific | 2001 |
| Engage Markets Limited | Information & communication | 2024 |
| Enhance (Bath) Ltd | Other services | 2021 |
| ENI Care Homes CIC | Real estate | 2022 |
| Enojem Residential Ltd | Real estate | 2022 |
| Entry Hill House Freehold Limited | Households | 2024 |
| Eq-Quality Ltd | Information & communication | 2024 |
| ESG Farms Ltd | Professional & scientific | 2024 |
| Essential Cycles Gower Ltd | Wholesale & retail | 2021 |
| ETA Tauri Limited | Professional & scientific | 2021 |
| Etcareservices Ltd | Health & social care | 2025 |
| Eurofans Limited | Professional & scientific | 2001 |
| Everbright Limited | Real estate | 2002 |
| Evserve Ltd | Professional & scientific | 2021 |
| Excel Advisory Ltd | Professional & scientific | 2024 |
| Execfirm Ltd | Transport & logistics | 2017 |
| F & S Watts Properties Limited | Construction | 2010 |
| Fairyglass Limited | Wholesale & retail | 2010 |
| Falb Limited | Professional & scientific | 2024 |
| Family Law Week Limited | Extraterritorial | 2011 |
| Farah Malik HR Consultancy Limited | Professional & scientific | 2016 |
| Farbridge (Hamilton House) Limited | Households | 2007 |
| Farbridge Properties (Bath) Limited | Households | 1974 |
| Feelgood France Limited | Hospitality | 2014 |
| Ferdys Limited | Real estate | 2015 |
| Fertilivet Ltd | Professional & scientific | 2025 |