| Azlan European Finance Limited | Professional & scientific | 2001 |
| Azlan Group Limited | Professional & scientific | 1992 |
| Azlan Limited | Professional & scientific | 1986 |
| Aztec Umbrella Systems Limited | Manufacturing | 2016 |
| Azzaryaat Estates Ltd | Real estate | 2023 |
| B & R Alpha Limited | Real estate | 2023 |
| B & R Sigma Limited | Construction | 2024 |
| B & V Masonry Limited | Administrative & support | 1985 |
| B Leisure Limited | Arts & recreation | 2025 |
| B P S Decorating Ltd | Construction | 2026 |
| B&B Innovitae Ltd | Wholesale & retail | 2025 |
| B&S Partners Ltd | Real estate | 2025 |
| B&T Home Care Support Ltd | Health & social care | 2023 |
| B&V Masonry Group Limited | Administrative & support | 2019 |
| B-Plan Information Systems Limited | Information & communication | 1993 |
| B.E.N Locksmiths Ltd | Manufacturing | 2013 |
| B.J. Champion Brickwork Contractors Ltd. | Construction | 1999 |
| B.J. Champion Contractors Limited | Construction | 1990 |
| B.J. Champion Holdings Ltd. | Professional & scientific | 1999 |
| B.J. Champion Scaffolding Ltd. | Construction | 1999 |
| B6 Solutions Ltd | Professional & scientific | 2003 |
| BA Air Solutions Ltd | Construction | 2023 |
| BA Construction Group Ltd | Construction | 2022 |
| BA Luxe Trading Ltd | Wholesale & retail | 2020 |
| BA Medical Consultancy Ltd | Health & social care | 2018 |
| Baba Group Ltd | Wholesale & retail | 2025 |
| Baba Turkish Kebab Ltd | Hospitality | 2019 |
| Babyliss UK Limited | Wholesale & retail | 1993 |
| Back to the Future Again Limited | Professional & scientific | 2017 |
| Backline Rent Ltd | Arts & recreation | 2024 |
| Bader Quince Ltd | Professional & scientific | 2022 |
| Badger Media Ltd | Manufacturing | 2016 |
| Badila Transport Ltd | Transport & logistics | 2018 |
| Bahsow House Maid Cleaner Ltd | Other services | 2025 |
| Bailey House Mgmt Co Ltd | Households | 2025 |
| BAK M Limited | Wholesale & retail | 2016 |
| Baked Together Limited | Wholesale & retail | 2025 |
| Baker Davidson Thomas Limited | Professional & scientific | 2011 |
| Baker Gilbey Associates Ltd. | Professional & scientific | 2016 |
| Bakers Coaching Ltd | Arts & recreation | 2019 |
| Baladna Enterprise Ltd | Wholesale & retail | 2026 |
| Balanced Business Services Ltd | Professional & scientific | 2026 |
| Balaz Enterprise Global Ltd | Real estate | 2025 |
| Balbus (UK) Limited | Professional & scientific | 2011 |
| Baldertech Ltd | Wholesale & retail | 2019 |
| Balloon Productions Limited | Information & communication | 2017 |
| Bamals Ltd | Construction | 2026 |
| Bambloo Ltd | Wholesale & retail | 2019 |
| Bamenda Securities Limited | Financial services | 2019 |
| Bandit Creative Ltd | Manufacturing | 2016 |
| Baraha Ltd | Hospitality | 2019 |
| Barbell-On Ltd | Health & social care | 2021 |
| Barbu Trans Ltd | Transport & logistics | 2025 |
| Barchetta Design Ltd | Professional & scientific | 2022 |
| Barcom Plumbing & Heating Limited | Construction | 2008 |
| Barfoot Energy Projects Ltd | Construction | 2010 |
| Bargain Hunt Limited | Wholesale & retail | 2019 |
| Barkitecture Ltd | Wholesale & retail | 2025 |
| Barlow Construction (Hampshire) Limited | Construction | 2022 |
| Barnes and Robertson Limited | Real estate | 2021 |
| Barnes Family Management Ltd | Financial services | 2020 |
| Barons (Southern) Limited | Real estate | 1990 |
| Barr & Larkin Limited | Manufacturing | 2023 |
| Barrett Contract Services Ltd | Construction | 2006 |
| Barrett Contractor Services Ltd | Construction | 2016 |
| Barribal Associates Limited | Administrative & support | 2011 |
| Barter Basingstoke Ltd | Professional & scientific | 2023 |
| Bartlett Aedifico Ltd | Construction | 2023 |
| BAS Plumbing Services Ltd | Construction | 2024 |
| Baseline Management Solutions Ltd | Professional & scientific | 2022 |
| Basing Decorating Services Ltd | Construction | 2023 |
| Basing Developments Limited | Construction | 2018 |
| Basing DRY Clean Ltd | Other services | 2019 |
| Basing Tech Ltd | Other services | 2025 |
| Basingstoke & District Model Engineering Society Limited | Other services | 2014 |
| Basingstoke Academy of Dancing LLP | | 2025 |
| Basingstoke and Deane Canoe Club | Arts & recreation | 2012 |
| Basingstoke Apartment Service Limited | Real estate | 2006 |
| Basingstoke Appliance Service Ltd | Manufacturing | 2002 |
| Basingstoke Asian Cash and Carry Limited | Wholesale & retail | 2025 |
| Basingstoke Bison Ice Hockey Academy Limited | Arts & recreation | 2025 |
| Basingstoke Bolt & Tool Limited | Wholesale & retail | 2011 |
| Basingstoke Boxing Classes Ltd | Arts & recreation | 2025 |
| Basingstoke Business Stays Limited | Hospitality | 2025 |
| Basingstoke Cakeco Limited | Wholesale & retail | 2024 |
| Basingstoke Cleaning Services Limited | Administrative & support | 2006 |
| Basingstoke Community Churches | Other services | 1997 |
| Basingstoke Entertainment Ltd | Arts & recreation | 2025 |
| Basingstoke Express Car Ltd | Other services | 2024 |
| Basingstoke Fire Protection Limited | Construction | 1976 |
| Basingstoke Flooring Limited | Construction | 2017 |
| Basingstoke Gurkhas Ltd | Real estate | 2017 |
| Basingstoke Gymnastic Club | Arts & recreation | 1993 |
| Basingstoke Hema Limited | Arts & recreation | 2020 |
| Basingstoke Hockey Club Limited | Arts & recreation | 2017 |
| Basingstoke Honey Limited | Manufacturing | 2023 |
| Basingstoke Irish Society | Other services | 2005 |
| Basingstoke Itec Limited | Professional & scientific | 1993 |
| Basingstoke Lettings Limited | Households | 2003 |
| Basingstoke Makerspace | Other services | 2017 |