| Autocare Service Centre Limited | Wholesale & retail | 2020 |
| Automated Energy Management Limited | Professional & scientific | 2020 |
| Autonomous Land Limited | Administrative & support | 2025 |
| Autonomous Sky Limited | Administrative & support | 2025 |
| Autonomous Water Limited | Administrative & support | 2025 |
| Auxilium Financial Risk Management Ltd. | Administrative & support | 2018 |
| AV & ME Ltd | Construction | 2024 |
| AVA Legal & Co Ltd | Professional & scientific | 2024 |
| AVA Poppy Ltd | Public administration | 2026 |
| Avap C.I.C. | Public administration | 2026 |
| AVD Property Services Limited | Construction | 2025 |
| Avendra Hotels Limited | Hospitality | 2025 |
| Avendra Limited | Professional & scientific | 2025 |
| Avid Creations Limited | Professional & scientific | 2021 |
| Aviv Healthcare Limited | Health & social care | 2023 |
| AVM Health Care Ltd | Health & social care | 2025 |
| Avory Holdings Limited | Financial services | 2013 |
| Avresco Limited | Wholesale & retail | 2017 |
| AW Investments Limited | Real estate | 2016 |
| AWA Builders Ltd | Professional & scientific | 2011 |
| Awaka Ltd | Administrative & support | 2021 |
| AWL Glazing Ltd | Construction | 2020 |
| Awlliant Limited | Real estate | 2015 |
| Axel Engineering Limited | Administrative & support | 2011 |
| Axiom Communications (UK) Limited | Professional & scientific | 2012 |
| Ay-Vee Limited | Administrative & support | 2022 |
| Azeira Luxury Hair Limited | Other services | 2024 |
| Aztec Lifestyle Ltd | Extraterritorial | 2025 |
| Aztech Motorsport Ltd | Professional & scientific | 2014 |
| Azul Circularity Ltd | Professional & scientific | 2024 |
| Azury Digital & Tech Solutions Ltd | Wholesale & retail | 2021 |
| Azzara Ltd | Construction | 2014 |
| B & a Transport Services Ltd | Transport & logistics | 2018 |
| B 4 CAP Limited | Real estate | 2017 |
| B and L Edwards Holdings Limited | Financial services | 2013 |
| B and T Press Ltd. | Information & communication | 2016 |
| B E Contractors Limited | Construction | 2015 |
| B G E Electrical Limited | Construction | 2022 |
| B H Architecture Limited | Professional & scientific | 2007 |
| B M Valeting Limited | Administrative & support | 2013 |
| B Middleton Consulting Limited | Health & social care | 2022 |
| B Prop 2 Ltd | Real estate | 2018 |
| B R Carpentry Limited | Construction | 2015 |
| B R Carpentry Services Ltd | Construction | 2023 |
| B R T Surfacing Limited | Construction | 2017 |
| B W Scaffolding Consultants Limited | Construction | 2013 |
| B Wason Plumbing & Heating Limited | Construction | 2023 |
| B&A Transport Holdings Limited | Financial services | 2025 |
| B&C Management Consultancy Limited | Professional & scientific | 2024 |
| B&F Academy Limited | Education | 2025 |
| B&H Limited | Financial services | 2001 |
| B&L Blue Diamond Properties Ltd | Real estate | 2024 |
| B&L Motorcycles Ltd | Wholesale & retail | 2022 |
| B&R Training and Coaching Limited | Education | 2025 |
| B'Ave Properties Limited | Real estate | 2020 |
| B-Safe Event Security Limited | Administrative & support | 2022 |
| B.A. Healthcare Professionals Ltd. | Health & social care | 2019 |
| B.H.C. (Hindhead) Limited | Households | 1975 |
| B.L Plastering Limited | Construction | 2017 |
| B.N.E.C Group Limited | Financial services | 2020 |
| B.N.E.C. Limited | Construction | 2009 |
| B.O.K Home Improvements Ltd | Construction | 2025 |
| Babbage Digital Limited | Real estate | 2011 |
| Back From the Past Limited | Wholesale & retail | 2024 |
| Back to the Retro Ltd | Wholesale & retail | 2026 |
| Bailey Bros. (Southern) Limited | Agriculture & fishing | 1994 |
| Bailey's Buses (Portsmouth) Limited | Transport & logistics | 2000 |
| Baker & Hartnell Investments Limited | Real estate | 2018 |
| Bakers Delights With a Little Fizz Ltd | Manufacturing | 2026 |
| Bakes Roofing Limited | Construction | 2002 |
| Bakes SK Limited | Wholesale & retail | 2025 |
| Balanced Body Ltd | Arts & recreation | 2015 |
| Baldcat Digital Ltd | Professional & scientific | 2021 |
| Balerno Consulting Limited | Information & communication | 2011 |
| Ball Estates Limited | Real estate | 2014 |
| Balloon-Fantasia Ltd | Wholesale & retail | 2022 |
| Bang on Branding Limited | Wholesale & retail | 2023 |
| Banksy Construction Ltd | Construction | 2023 |
| Barbarian Collective Ltd | Administrative & support | 2023 |
| Barbax Investments Limited | Financial services | 2016 |
| Barbecue Boss Ltd | Hospitality | 2026 |
| Barber Civil Engineering Limited | Construction | 2025 |
| Barber KIN NR2 Ltd | Other services | 2021 |
| Bark and Chews Ltd | Wholesale & retail | 2025 |
| Barn Green Roofing Limited | Construction | 2025 |
| Barnacle Procurement Limited | Professional & scientific | 2026 |
| Barnell Electrical Limited | Construction | 2026 |
| Barran Graduate Recruitment Ltd | Administrative & support | 2016 |
| Barrett Trading Ltd | Financial services | 2024 |
| Barry Wood Electrical Limited | Construction | 2005 |
| Bartlett Groundworks Limited | Water & waste | 2017 |
| Bastraff Construction Ltd | Construction | 2025 |
| Batalas Auditor Training Ltd | Professional & scientific | 2023 |
| Batalas Limited | Financial services | 1999 |
| Bath Escapes Limited | Administrative & support | 2024 |
| Batter-Up Batting Cages Ltd | Education | 2025 |
| Battersea PT Consultants Ltd | Arts & recreation | 2014 |
| Battle-Hardened Limited | Education | 2025 |
| Baxter Financial Services Ltd | Financial services | 2018 |
| Bayith Rest Home Limited | Health & social care | 2003 |