| Crossware Europe Limited | Information & communication | 2013 |
| Crown Properties Group Limited | Real estate | 2002 |
| CULTIV8 Secretarial Ltd | Professional & scientific | 2022 |
| Curran Enterprises Ltd | Construction | 2018 |
| Currypool Renewables Limited | Extraterritorial | 2014 |
| Custom Labels Limited | Manufacturing | 2005 |
| Custom Prezzy Limited | Wholesale & retail | 2024 |
| CW Land Ltd | Real estate | 2025 |
| Cybershield Technologies Ltd | Wholesale & retail | 2024 |
| Cymro Tavern Limited | Hospitality | 2006 |
| D & M Property Investments Limited | Administrative & support | 2010 |
| D W Marshall Building Ltd | Construction | 2025 |
| D&H Investments Limited | Real estate | 2021 |
| D&N Fast Ltd | Construction | 2025 |
| D-Jac Retail Ltd | Wholesale & retail | 2023 |
| D.G. Installations (South West) Limited | Construction | 2013 |
| D8 Design Ltd | Professional & scientific | 2019 |
| DAB Property Rental Ltd | Real estate | 2024 |
| Daily Needs Trading Ltd | Wholesale & retail | 2020 |
| Daisy Vending Ltd | Extraterritorial | 2021 |
| Dajm Couriers Limited | Transport & logistics | 2025 |
| Dan's Engineering Ltd | Manufacturing | 2008 |
| Danbury Campervans Ltd | Wholesale & retail | 2019 |
| Danceworks Frome Ltd | Administrative & support | 2011 |
| Daneville Properties Limited | Construction | 2005 |
| Dangerous Goods Safety Advisers Limited | Professional & scientific | 1999 |
| Dans Vehicle Solutions Ltd | Wholesale & retail | 2025 |
| Dantaet Limited | Wholesale & retail | 2008 |
| Danube Bridgwater Mini Market Ltd | Wholesale & retail | 2025 |
| DAR Home Improvements Ltd | Construction | 2014 |
| Darren Hook Consulting Ltd | Administrative & support | 2023 |
| Darwaza Market Limited | Wholesale & retail | 2024 |
| Data Vault Ltd | Information & communication | 2012 |
| Dataroll Limited | Manufacturing | 2000 |
| Dave Gardner Ltd | Administrative & support | 2013 |
| Dave LEE (Assets) Limited | Administrative & support | 2005 |
| Dave LEE Limited | Construction | 2005 |
| David Holmes & Associates Limited | Professional & scientific | 2014 |
| David James Agricultural Engineer Limited | Wholesale & retail | 2004 |
| David Jane Aero Paint Limited | Manufacturing | 2025 |
| Davies Homes (S.W.) Limited | Construction | 2017 |
| Daylage Construction Limited | Construction | 2011 |
| DB Precision Concrete Ltd | Construction | 2025 |
| DBC TV and Film Ltd | Construction | 2019 |
| Dbridge SUB Ltd | Hospitality | 2024 |
| DBX Software Ltd | Information & communication | 2025 |
| DC Contracting & Rigging Services Ltd | Construction | 2017 |
| DC Land Limited | Construction | 2020 |
| DCD Clapp Investments Ltd | Real estate | 2017 |
| DD Lettings Limited | Real estate | 2024 |
| De-Vey Events Ltd | Arts & recreation | 2024 |
| De-Vey Group Ltd | Arts & recreation | 2024 |
| Deafinate Matters CIC | Administrative & support | 2020 |
| Dean Development (Wessex) Limited | Real estate | 1987 |
| Dear Download Limited | Wholesale & retail | 2024 |
| Dearing Properties Ltd | Real estate | 2014 |
| Decor Europe Limited | Construction | 2020 |
| Decor Systems Group Limited | Financial services | 2016 |
| Dee-Pharms Limited | Health & social care | 2018 |
| Deeper Conversations Limited | Professional & scientific | 2012 |
| Deez Supplies Limited | Wholesale & retail | 2026 |
| Dehane Rhodes Limited | Construction | 2005 |
| Dejarbrew Ltd | Hospitality | 2023 |
| Deluxe Kebab House Ltd | Hospitality | 2025 |
| Deluxe Pizza (Bridgwater) Ltd | Hospitality | 2022 |
| Deluxe Pizza Ltd | Hospitality | 2024 |
| Demchey Ltd | Administrative & support | 2010 |
| Denend House Ltd | Real estate | 2025 |
| Deniz Kebab Limited | Hospitality | 2025 |
| Denovan Developments Ltd | Real estate | 2022 |
| Derek Randall & Associates Limited | Professional & scientific | 1996 |
| Derwent Valley Solutions Limited | Information & communication | 2008 |
| DGH Limited | Construction | 2009 |
| DH Carpentry Limited | Manufacturing | 2004 |
| Dialogue Community Performance | Administrative & support | 2017 |
| Diana Gallego Limited | Extraterritorial | 2014 |
| Dickinson Sealants Limited | Construction | 2014 |
| Different Thinking Ltd | Professional & scientific | 2018 |
| Digges Consulting Limited | Professional & scientific | 2025 |
| Digital Phone World Ltd | Wholesale & retail | 2021 |
| Diglis Cottages Ltd | Hospitality | 2021 |
| Diglis Developments Ltd | Construction | 2021 |
| Diglis Estates Ltd | Construction | 2023 |
| Diglis Ltd | Construction | 2021 |
| Diglis Property Ltd | Real estate | 2021 |
| Dimmax Ltd | Transport & logistics | 2024 |
| Dimrock Ltd | Hospitality | 2025 |
| Dinas Trees Ltd | Agriculture & fishing | 2023 |
| Dingbat Properties Limited | Real estate | 2024 |
| Dirty Harrys South West Ltd | Administrative & support | 2022 |
| Discovery Ministries Ltd | Arts & recreation | 2018 |
| Distinction Property Ltd | Real estate | 2022 |
| Diverse Fine Food Limited | Wholesale & retail | 2007 |
| Divided by Zero Ltd | Administrative & support | 2015 |
| Dixie Corporation Somerset Limited | Real estate | 2025 |
| Dixonbeats Ltd | Information & communication | 2023 |
| DJB Armstrong Limited | Information & communication | 2016 |
| Djbcontracting Ltd | Agriculture & fishing | 2022 |
| DJM Landscaping Ltd | Construction | 2024 |
| Djscareservices Ltd | Health & social care | 2025 |