| 1&1 Underwater Search Consultants Ltd | Professional & scientific | 2023 |
| 14 Kingsley Gardens Management Company Limited | Households | 2016 |
| 18 Creighton Road Freehold Limited | Households | 2010 |
| 18 Ridgway Road Farnham Limited | Real estate | 1993 |
| 18 Tournay Road Limited | Households | 1986 |
| 1803 Ltd | Construction | 2022 |
| 199 Wellsway Ltd | Real estate | 2023 |
| 1ST 4 Students Ltd | Real estate | 1996 |
| 1ST Choice Carpets and Flooring Limited | Wholesale & retail | 2017 |
| 1ST Green Electrical Ltd | Construction | 2019 |
| 2 Stones Construction Ltd | Construction | 2024 |
| 20 Hampton Park Limited | Households | 1985 |
| 20 Northgate Street Management Company Limited | Households | 1991 |
| 20-22 Hillier Road RTM Company Ltd | Households | 2018 |
| 207/209 London Road Management Company Limited | Households | 2004 |
| 3/3A the Island Management Company Limited | Households | 2025 |
| 31 Richmond Road Exeter Freeholders Limited | Households | 2021 |
| 36 Delorme Street Management Limited | Professional & scientific | 2004 |
| 3D Video Ltd | Information & communication | 2010 |
| 4 Dots Training & Advisory Limited | Professional & scientific | 2019 |
| 58 Hill Corner Road Chippenham Management Limited | Households | 1989 |
| 6, 8, 14 and 16 Anzio Road Management Company Limited | Households | 2013 |
| 60 Mirabel Road Limited | Real estate | 2008 |
| A & a Industries Limited | Information & communication | 2021 |
| A C Matthews Limited | Administrative & support | 2007 |
| A Clarke Plastering Ltd | Construction | 2024 |
| A E P Aviation Limited | Transport & logistics | 2018 |
| A Lawton Properties Limited | Construction | 2026 |
| A P Smart Ltd | Construction | 2020 |
| A&J Topp Consulting Ltd | Professional & scientific | 2025 |
| A.B. Gerrish Limited | Transport & logistics | 2006 |
| A.P Mcdonald Funeral Services Ltd | Other services | 2018 |
| A2B Taxi Devizes Ltd | Transport & logistics | 2023 |
| A6 Consulting Ltd | Information & communication | 2023 |
| AAP Taxi and Private Hire Ltd | Transport & logistics | 2017 |
| Aara Retail Rowde Limited | Wholesale & retail | 2024 |
| AB Coaching and Leadership Limited | Professional & scientific | 2007 |
| Abacus Facilities Services Ltd | Construction | 2024 |
| ABC Accounting Services (South West) Limited | Professional & scientific | 1995 |
| ABD Legal Limited | Extraterritorial | 2012 |
| Abeadsc Limited | Wholesale & retail | 2004 |
| Abstracts of DMK Ltd | Arts & recreation | 2025 |
| AC Sports Coaching Limited | Arts & recreation | 2024 |
| Accensus Fire Consulting Limited | Professional & scientific | 2014 |
| Accountancy Mentor Limited | Administrative & support | 2011 |
| Acorn Propco Ltd | Real estate | 2021 |
| ACS & Sons General Builders Ltd | Construction | 2017 |
| ACS Design and Management Ltd | Professional & scientific | 2026 |
| ACS Plumbing and Heating (Devizes) Ltd | Construction | 2018 |
| Actually in the Arena Limited | Professional & scientific | 2020 |
| Adage Engineering Limited | Manufacturing | 2008 |
| ADD Blue Ltd | Information & communication | 2013 |
| Addicted Devizes Ltd | Wholesale & retail | 2007 |
| Adrak Limited | Hospitality | 2026 |
| AGE UK Wiltshire | Health & social care | 1987 |
| AGE UK Wiltshire Trading Limited | Health & social care | 2011 |
| AGE Wessex | Health & social care | 2007 |
| Agile Strategy Limited | Professional & scientific | 2022 |
| Agile Vehicle Technologies Limited | Manufacturing | 2014 |
| Agility in Mind Ltd | Agriculture & fishing | 2010 |
| Agim & Klodian Ltd | Wholesale & retail | 2020 |
| AHEAD4THERAPY Ltd | Real estate | 2020 |
| AI Exchange Ltd | Financial services | 2017 |
| Air and Space Evidence Ltd | Professional & scientific | 2014 |
| Aisa Financial Planning Limited | Financial services | 1998 |
| Aisa Ltd | Administrative & support | 1998 |
| AJ1 Fitness Ltd | Arts & recreation | 2019 |
| AKC Rural LLP | | 2024 |
| Alarms and Electrical (Devizes) Limited | Administrative & support | 1976 |
| Albion Securities Limited | Real estate | 1991 |
| ALC Equestrian Limited | Wholesale & retail | 2021 |
| Alchemy Development and Management Limited | Real estate | 2021 |
| Alchemy Investment Management | Financial services | 2021 |
| Alexander Investments 2019 Limited | Professional & scientific | 2019 |
| ALI Finney Catering Ltd | Hospitality | 2015 |
| Allington Farms Limited | Agriculture & fishing | 2011 |
| Alscelar Golf Ltd | Arts & recreation | 2023 |
| Alygya Trans Ltd | Transport & logistics | 2017 |
| Amaya Spice Ltd | Hospitality | 2020 |
| Amaya Ventures Limited | Financial services | 2019 |
| Amazonas Trading Limited | Wholesale & retail | 2025 |
| Amberley Brown & Co Ltd | Administrative & support | 2025 |
| AMD Carpentry and General Building Limited | Construction | 2008 |
| Ammi Flowers LLP | | 2007 |
| AMS Electrics Limited | Construction | 2019 |
| Amwell Pride Limited | Hospitality | 2015 |
| Amélie Devizes Ltd | Wholesale & retail | 2022 |
| Analytical Technology and Control Limited | Manufacturing | 1993 |
| Ananda Sangha UK C.I.C. | Health & social care | 2025 |
| Andrew Martin Associates Ltd | Professional & scientific | 2019 |
| Anglican Church of ST Stephen the Martyr Limited | Other services | 2020 |
| Anne Graham Ltd | Professional & scientific | 2021 |
| Ansell Excavations Limited | Construction | 2026 |
| Anthony Brown Creative Consulting Ltd | Manufacturing | 2014 |
| Apest Solutions Ltd | Administrative & support | 2014 |
| Aphobos Consulting Ltd | Professional & scientific | 2024 |
| Apis Media Ltd | Information & communication | 2024 |
| Apna Nutrition Ltd | Wholesale & retail | 2025 |
| Aposeni Holding Ltd | Financial services | 2022 |
| Approcourt Limited | Professional & scientific | 1994 |