| Aquaspeed Plumbing and Heating Limited | Construction | 2000 |
| Archibal Creative Ltd | Administrative & support | 2010 |
| Archibald Shaw LLP | | 2005 |
| Arena Men's Clothing Limited | Wholesale & retail | 1998 |
| ARH Business Services Ltd | Information & communication | 2005 |
| Arif and Sons Property Maintenance Ltd | Construction | 2020 |
| ARK Foods Bognor Regis Ltd | Hospitality | 2024 |
| Aronel Cottage Care Home Ltd | Health & social care | 2003 |
| Artistic Stone Limited | Manufacturing | 2003 |
| Artizan Agencies Ltd | Hospitality | 1999 |
| Arun District Indoor Bowling Club Limited | Arts & recreation | 1983 |
| Arun Holdings Limited | Wholesale & retail | 1995 |
| Arun Spray Limited | | 1982 |
| Arun Vehicle Repairs Limited | | 1976 |
| Arundel Arboretum Limited | Wholesale & retail | 2003 |
| Arundel Business Associates Ltd | Professional & scientific | 2003 |
| Arundel Carpet Company Ltd. | Administrative & support | 2003 |
| Asava Construction Ltd | Construction | 2022 |
| Ashbourne Healthcare Services Limited | Real estate | 2005 |
| Ashburner Construction Ltd | Construction | 2001 |
| Ashley Consultants Holdings Limited | Construction | 2021 |
| Ashley Consultants UK Limited | Construction | 2014 |
| Ashurstwood M.O.T. Centre Ltd | Wholesale & retail | 2006 |
| Asset Registrations Limited | Information & communication | 2006 |
| Assh Limited | Construction | 2017 |
| Assinder International Limited | Professional & scientific | 2007 |
| Assured Care Services Limited | Health & social care | 2003 |
| Aston Vaughan Limited | Real estate | 2024 |
| Atlantic Court Residents Company Limited | Real estate | 1990 |
| Attentus Limited | Professional & scientific | 1994 |
| Aurmark Invest Limited | Financial services | 2006 |
| Aurora Systems Limited | Professional & scientific | 2010 |
| Austin Healey Associates Limited | Wholesale & retail | 1986 |
| Autarky Automation Limited | Manufacturing | 1972 |
| Autarky Group Limited | Manufacturing | 1997 |
| Automated Panels Limited | Wholesale & retail | 2005 |
| Avicare Limited | Transport & logistics | 1990 |
| Avichem Limited | Transport & logistics | 1998 |
| AVL Medical Instruments U.K. Limited | Professional & scientific | 1989 |
| Avtrade Holdings Limited | Administrative & support | 2001 |
| Avtrade Leasing Limited | Real estate | 1998 |
| Avtrade Limited | Wholesale & retail | 1985 |
| Avtrade New Product Services Limited | Administrative & support | 2003 |
| Avtrade Spares Leasing Limited | Administrative & support | 2006 |
| AXE Block Management Limited | Real estate | 2020 |
| B & C Consulting Limited | Financial services | 2003 |
| B & C E Insurance Limited | Financial services | 1995 |
| B & W Group Ltd | Manufacturing | 1966 |
| B & W Loudspeakers Ltd | Professional & scientific | 2003 |
| B.H. Norton & SON Limited | Construction | 1999 |
| B.J. Wesson Building Services Limited | Wholesale & retail | 1991 |
| Babcock PED Limited | Professional & scientific | 1959 |
| Backup Accounts Limited | Professional & scientific | 2020 |
| Badcock Business Solutions Limited | Professional & scientific | 2005 |
| Bajan Dreams Limited | | 1986 |
| Bake 'N' Treat Ltd | Manufacturing | 2021 |
| Balgarvie Solar Limited | Financial services | 2023 |
| Ballpoint Office Supplies Limited | Wholesale & retail | 2007 |
| Balstar Limited | Information & communication | 2013 |
| Barney Arthur Ltd | Professional & scientific | 2025 |
| Barnham Manor Limited | Health & social care | 2002 |
| Barry Hunt Limited | Other services | 2002 |
| Bartholomew Developments Limited | Real estate | 1985 |
| Basetrack Systems Limited | Information & communication | 1998 |
| Bayton Court Management Company Limited | Households | 2003 |
| BB Gems Limited | Wholesale & retail | 1997 |
| Beachtown Limited | Households | 2006 |
| Beachway Management Limited | Households | 1967 |
| Beaconcroft Limited | | 1989 |
| Bean Interiors Limited | Professional & scientific | 2004 |
| Beautiful Gardens Design Studio Limited | Professional & scientific | 2006 |
| Bedlam Solutions Limited | Professional & scientific | 2003 |
| Berater Limited | Professional & scientific | 2001 |
| Berrington Blue Ltd | Information & communication | 2004 |
| Bespoke Properties Limited | Construction | 1996 |
| Bespoke Property Group Limited | Construction | 2003 |
| Bespoke Property Rudgwick Limited | Construction | 2003 |
| Bestwell Computing Ltd | Information & communication | 2006 |
| Betts Contract Carpentry Limited | Construction | 2003 |
| BG Worthing Limited | Education | 2003 |
| Bgreen Gardens Limited | Other services | 2006 |
| BH Partners Limited | Professional & scientific | 2001 |
| BHI Limited | Manufacturing | 2002 |
| Big Bay Seafoods Ltd | Professional & scientific | 2026 |
| Billy Smart's Circus Limited | Extraterritorial | 1990 |
| BIN Cleen Dave Ltd | Other services | 2005 |
| Binghams Construction Ltd | Construction | 2005 |
| Birch Tree Gardens Management Company Limited | Households | 2004 |
| Birchpiece Farms Limited | Agriculture & fishing | 1966 |
| Bishopshurst Limited | Construction | 2002 |
| Blackbird Traders Ltd | Wholesale & retail | 2021 |
| Blade Building Services Limited | Construction | 2003 |
| BLANC7 Limited | Other services | 2016 |
| Blerg Ltd | Information & communication | 2020 |
| Blinders Limited | Real estate | 2007 |
| Blitzer Cleaning Ltd | Administrative & support | 2006 |
| Blue IT Services Limited | Information & communication | 2004 |
| Body Jewellery Direct Limited | Transport & logistics | 2000 |
| Body Matters Gold Limited | Wholesale & retail | 2002 |
| Bookajet Aircraft Engineering Limited | Professional & scientific | 2004 |