| Axiora Management Ltd | Professional & scientific | 2026 |
| Axis Property Management Limited | Construction | 1985 |
| AY Payroll Services Limited | Administrative & support | 2014 |
| Ay-Uk Limited | Transport & logistics | 2024 |
| Ayaval International Limited | Information & communication | 2023 |
| Aystarcutz Ltd | Other services | 2025 |
| Azesha Ltd | Wholesale & retail | 2025 |
| Azraco Trading Ltd | Wholesale & retail | 2026 |
| Aztec Electronics Limited | Extraterritorial | 2024 |
| Azzurro-Blu Limited | Information & communication | 2015 |
| B & a Developments Ltd | Construction | 2023 |
| B & C Bryant Plumbing and Heating Ltd | Construction | 2017 |
| B & M Wines Ltd | Manufacturing | 2019 |
| B & S Engineering (Southern) Limited | Professional & scientific | 2002 |
| B COX Consulting Limited | Professional & scientific | 2014 |
| B Good Films Ltd | Information & communication | 2006 |
| B M and C Properties Ltd | Construction | 2020 |
| B-9 Fire Protection Limited | Administrative & support | 2005 |
| B.A.D Investors Limited | Other services | 2022 |
| B.C.F. Travel Club Ltd | Financial services | 2011 |
| B.O.P. Marles Ltd | Professional & scientific | 2026 |
| B3D Creative Ltd | Manufacturing | 2019 |
| B4 Global (PVT) Ltd | Wholesale & retail | 2025 |
| B4 Meat&Fish Ltd | Wholesale & retail | 2021 |
| Babysen Ltd | Wholesale & retail | 2023 |
| Bach Intro Limited | Professional & scientific | 2025 |
| Back in Action Osteopathy Limited | Health & social care | 2015 |
| Backshore Ltd | Professional & scientific | 2023 |
| Bacolet Properties Limited | Real estate | 2017 |
| Badgemore House Limited | Construction | 2022 |
| Bailey CW Limited | Manufacturing | 2025 |
| Bailey Products Ltd | Wholesale & retail | 2022 |
| Bailey Total Building Envelope Limited | Wholesale & retail | 2012 |
| Baileys Family Butchers Ltd | Wholesale & retail | 2023 |
| Baileysbespoke Ltd | Manufacturing | 2020 |
| Balabad Ltd | Professional & scientific | 2025 |
| Balabag Healthcare Limited | Health & social care | 2014 |
| Balahjewellery Ltd | Wholesale & retail | 2022 |
| Baldwin Scofield Accountancy LLP | | 2015 |
| Baldwin Scofield Limited | Professional & scientific | 2012 |
| Baldwin Trustees Limited | Professional & scientific | 1987 |
| Ballet Limited | Arts & recreation | 2017 |
| Bandstream Media and Corporate Communications Limited | Information & communication | 2010 |
| Banks Security Solutions Limited | Administrative & support | 2020 |
| Baocci Ltd | Hospitality | 2019 |
| Barcks London Ltd | Professional & scientific | 2022 |
| Barcor MP Limited | Information & communication | 2014 |
| Bardiya Limited | Hospitality | 2024 |
| Bargain Coppers UK Ltd | Wholesale & retail | 2022 |
| Bargate Partners Limited | Professional & scientific | 2021 |
| Barhatch Enterprises Ltd | Professional & scientific | 2024 |
| Barker-Eaton Ltd | Information & communication | 2024 |
| Barnard Hallows Consulting Limited | Professional & scientific | 2013 |
| Barnes Business Finance Ltd | Financial services | 2025 |
| Barnes Carpentry & Building Contractors Ltd | Construction | 2020 |
| Barnham Land Ltd | Construction | 2026 |
| Barns Green Flooring Ltd | Construction | 2016 |
| Barrington Court (Horsham) Management Company Limited | Households | 2004 |
| Barrington Court (Horsham) RTM Company Limited | Real estate | 2016 |
| Barrington James Limited | Administrative & support | 2002 |
| Barrington James OSP Ltd | Administrative & support | 2024 |
| Barrington Road Limited | Professional & scientific | 2008 |
| Barrington Training & Consultancy Ltd | Professional & scientific | 2017 |
| Barrow & Cole Ltd | Wholesale & retail | 2017 |
| Barry Edgar Garden Developments Limited | Professional & scientific | 1961 |
| Bartle & Wood Ltd | Professional & scientific | 2024 |
| Bartlett Property & Gardens Limited | Construction | 2016 |
| Barton, Brownsdon & Sadler Limited | Wholesale & retail | 1985 |
| Base Ingredients Limited | Wholesale & retail | 2024 |
| Basepoint Homes Ltd | Real estate | 2019 |
| Baskets in Bloom Ltd | Agriculture & fishing | 2016 |
| Basketshop Ltd | Wholesale & retail | 2025 |
| Battered HAT Records Ltd | Information & communication | 2014 |
| BAX Castle Ltd | Hospitality | 2023 |
| Bay Tree Inc Ltd | Other services | 2026 |
| Baynards (Witley) Limited | Wholesale & retail | 2008 |
| Baysfield Technology Limited | Real estate | 1997 |
| BB10 Holdings Limited | Financial services | 2022 |
| Bbfeenix Ltd | Health & social care | 2025 |
| Bbgn Energy Ltd | Energy | 2022 |
| Bbhb Limited | Professional & scientific | 2011 |
| Bbhfc Senior Section & the Venue Limited | Arts & recreation | 2023 |
| BBN Group Limited | Manufacturing | 2022 |
| BCJ Financial Planning Ltd | Financial services | 2010 |
| BCL HC Limited | Health & social care | 2024 |
| BCT Renewables UK Ltd | Administrative & support | 2025 |
| BCW Office Products Limited | Wholesale & retail | 2006 |
| BD Plumbing & Heating Sussex Limited | Construction | 2026 |
| BD Roofing Services Ltd | Construction | 2025 |
| BD Travel Limited | Administrative & support | 2026 |
| BDH Risk Assessment Limited | Professional & scientific | 2013 |
| BE the Shyft Ltd | Education | 2026 |
| Beach Communications Limited | Construction | 1962 |
| Beach HUT Productions Ltd | Professional & scientific | 2015 |
| Beachplace 2 Limited | Real estate | 2007 |
| Beacons Multimedia Ltd | Administrative & support | 2013 |
| Beam Coaching & Training Limited | Education | 2020 |
| Bear Bytes Ltd | Information & communication | 2020 |
| Beaufort Services (London) Limited | Administrative & support | 2006 |
| Beautalis Limited | Other services | 2012 |