| 1 Larkstone Terrace Management Limited | Real estate | 2006 |
| 16 Catherine Street Limited | Wholesale & retail | 1997 |
| 20 High Street Corsham Management Company Limited | Extraterritorial | 2006 |
| 2112 IT Limited | Information & communication | 2007 |
| 23 Clarendon Road Management Company Limited | Professional & scientific | 2004 |
| 25 Gorringe Road Freehold Ltd | Households | 2019 |
| 29 Church Street Calne Management Company Limited | Households | 1993 |
| 360 Accountancy Limited | Professional & scientific | 2004 |
| 4 the High Street (Devizes) Management Company Limited | Households | 2021 |
| 47 Trowbridge Road Limited | Households | 1988 |
| 51 Malmesbury Road Limited | Extraterritorial | 2006 |
| 583 Fishponds Road Management Company Limited | Construction | 2005 |
| 72 Kent Road Swindon Limited | Real estate | 2003 |
| 7903 Limited | Administrative & support | 2006 |
| A & S Hospitality Ltd | Hospitality | 2021 |
| A D Mcmillan Associates Limited | Professional & scientific | 2007 |
| A J Iles & Sons Plant Limited | Administrative & support | 2006 |
| A R D Sharpe Ltd | Public administration | 2013 |
| A W B Commercials Limited | Water & waste | 2003 |
| A W Cole Services Limited | Administrative & support | 2005 |
| A. Vines Ltd | Construction | 2003 |
| A.L. King (Roofing) Ltd. | Construction | 1997 |
| A.M. Autotech Limited | Wholesale & retail | 2003 |
| A.R.C Developments 786 Ltd | Real estate | 2007 |
| A.S.Rigging Ltd | Information & communication | 2021 |
| ABA (Construction) Ltd | Construction | 2000 |
| Abbey News Ltd | Wholesale & retail | 2018 |
| ABD Legal Services Limited | Administrative & support | 1986 |
| Absolutely Cleaning Services Limited | Professional & scientific | 2000 |
| ABZW1246 Limited | Real estate | 2019 |
| AC Jackson Installations Ltd. | Information & communication | 2000 |
| AC Wellness and Development Ltd | Arts & recreation | 2019 |
| Accolade Electrical Limited | Construction | 2003 |
| Ace Golf Balls Limited | Wholesale & retail | 2005 |
| Action on Addiction | Health & social care | 2006 |
| Action Time Services Limited | Wholesale & retail | 2002 |
| Actuaries for Lawyers Limited | Administrative & support | 2003 |
| Acuario Ltd | Professional & scientific | 2006 |
| Adams & Watt Limited | Administrative & support | 1979 |
| Adom Sky Ltd | Health & social care | 2014 |
| Adrian Goodall Associates Limited | Professional & scientific | 2001 |
| Advanced Boiler Services Limited | Construction | 2002 |
| Advanced Imaging Systems Limited | Administrative & support | 2006 |
| Advanced Systems Installations Limited | Professional & scientific | 1988 |
| Agency Insight Limited | Professional & scientific | 2003 |
| AGW Group Ltd | Construction | 2004 |
| Aionis Limited | Information & communication | 1995 |
| Airofreem Limited | Professional & scientific | 1982 |
| Airsprung Limited | Professional & scientific | 1978 |
| Airsprung Property Limited | Professional & scientific | 1982 |
| AK Projects Limited | Professional & scientific | 2007 |
| Alastair Bramwell Plumbing & Heating Limited | Construction | 2001 |
| ALC Interiors Limited | Construction | 2002 |
| Alexandra Lodge (Bournemouth) Limited | Real estate | 1996 |
| ALL Instruments Limited | Manufacturing | 2005 |
| Alliance Consumer Health Limited | Extraterritorial | 2000 |
| Alliance Health Limited | Extraterritorial | 2000 |
| Alliance Healthcare Limited | Extraterritorial | 2000 |
| AMS 2393 Limited | Professional & scientific | 2005 |
| AMS 2474 Limited | Professional & scientific | 2006 |
| AMS 2757 Limited | Information & communication | 2006 |
| AMS 2797 Limited | Information & communication | 2006 |
| AMS 2906 Limited | Information & communication | 2007 |
| Analogue Consultants Limited | Professional & scientific | 2007 |
| Ancient & Modern Wines Limited | Wholesale & retail | 2002 |
| Andover Fork Truck Services Limited | Wholesale & retail | 1993 |
| Andrew Butler Golf & Leisure Services Limited | Arts & recreation | 1995 |
| Andrew Davis Limited | Construction | 2007 |
| Andrews Quality Meats Limited | Wholesale & retail | 2002 |
| Anglo Oxide Consultants Limited | Professional & scientific | 1999 |
| Ansa Solutions Ltd | Hospitality | 2003 |
| Antarina Limited | Information & communication | 2003 |
| AP Farriery Ltd | Other services | 2025 |
| Apetito (U.K.) Holdings Limited | Professional & scientific | 1995 |
| Apetito Limited | Manufacturing | 1928 |
| Appuldurcombe Garden Holiday Park Ltd | Hospitality | 2002 |
| Arborvitae Chinese Medical Centre Ltd. | Health & social care | 2011 |
| ARD Playgrounds Limited | Professional & scientific | 2003 |
| Ardens Health Informatics Holdings Limited | Financial services | 2026 |
| Ardens Health Informatics Limited | Professional & scientific | 2013 |
| Ardens Workplace Limited | Information & communication | 2020 |
| ARK Estates 4 Limited | Real estate | 2021 |
| Arlington House Bath Limited | Real estate | 2022 |
| Arpia Developments Limited | Real estate | 2025 |
| Arthur Cole Blacksmiths Limited | Manufacturing | 2002 |
| Artisan Innkeepers Ltd | Hospitality | 2022 |
| Asphalt Recycling UK Limited | Construction | 2007 |
| Assured Care Hub Ltd | Professional & scientific | 2026 |
| Astuce Technology Limited | Information & communication | 2006 |
| Atkinsons (Bishopstone) Limited | Professional & scientific | 2003 |
| ATO Grakai LLP | | 2021 |
| ATO Marine LLP | | 2011 |
| ATO Marine Operations LLP | | 2011 |
| Attention+Space Limited | Professional & scientific | 2004 |
| Aura Aura Ltd | Health & social care | 2016 |
| Aurea Search Ltd | Administrative & support | 2018 |
| Austinet Solutions Limited | Information & communication | 2018 |
| Auto-Unique Limited | Wholesale & retail | 2001 |
| Autocare Amesbury Limited | Wholesale & retail | 2003 |
| Automatic Welding Systems Limited | Manufacturing | 2005 |