| Basingstoke Mencap Services | Health & social care | 2000 |
| Basingstoke MOT and Servicing Centre Ltd | Wholesale & retail | 2010 |
| Basingstoke Multicultural Forum | Health & social care | 2012 |
| Basingstoke Orthodontics Limited Partnership | | 2015 |
| Basingstoke Pride CIC | Arts & recreation | 2023 |
| Basingstoke RFC Trading Limited | Arts & recreation | 2016 |
| Basingstoke Skip Hire & Southern Waste Management Limited | Administrative & support | 1999 |
| Basingstoke Soccer Centre Ltd | Hospitality | 2019 |
| Basingstoke Stays Limited | Real estate | 2024 |
| Basingstoke Sushi Limited | Hospitality | 2017 |
| Basingstoke Taxi Limited | Transport & logistics | 2025 |
| Basingstoke Town Limited | Arts & recreation | 2001 |
| Basingstoke Trades Ltd | Administrative & support | 2025 |
| Basingstoke Wellness Ltd. | Health & social care | 2017 |
| Basingstoke Window Cleaning Services Ltd | Administrative & support | 2017 |
| Bassett Holmes Limited | Real estate | 2017 |
| Basti Ltd | Transport & logistics | 2019 |
| Batchwood Flooring Ltd | Construction | 2025 |
| Bateman & Landa Limited | Manufacturing | 2026 |
| Bathroom World Installations Ltd | Construction | 2006 |
| Bay Tree Dental Centre Ltd | Health & social care | 2010 |
| Bayham Holdings Limited | Professional & scientific | 1996 |
| Bayham Limited | Manufacturing | 1945 |
| Bayley & Associates Limited | Information & communication | 2005 |
| Bazaar Store Ltd | Wholesale & retail | 2024 |
| BB GAS Services Ltd | Construction | 2021 |
| BB9 Consultancy Ltd | Administrative & support | 2013 |
| BBA Services Ltd | Health & social care | 2024 |
| BBE Alinex Ltd | Construction | 2021 |
| BBE Civils Ltd | Construction | 2014 |
| Bbih Limited | Arts & recreation | 2012 |
| BC Wilde Ltd | Professional & scientific | 2005 |
| BCB Service Solutions Limited | Transport & logistics | 2014 |
| Bcd-Atlantik Ltd | Wholesale & retail | 1991 |
| Bcgr Ltd | Wholesale & retail | 2025 |
| Bcot Professional Services Limited | Education | 2017 |
| BCS Contracting Limited | Other services | 2018 |
| BDL Transport Ltd | Transport & logistics | 2025 |
| BE Insured Life Ltd | Financial services | 2021 |
| BE More YOU Therapies Ltd | Health & social care | 2023 |
| BE Pretty Limited | Wholesale & retail | 2017 |
| BE Seen Marketing Ltd | Information & communication | 2011 |
| BE Underground Ltd | Health & social care | 2025 |
| BEA Inspired Limited | Health & social care | 2022 |
| Beacroft Referrals M Ltd | Professional & scientific | 2026 |
| Bead and Stone Limited | Manufacturing | 2012 |
| Beaker Consultancy Ltd | Information & communication | 2007 |
| Beamline Steel Limited | Manufacturing | 1998 |
| Bear Technical Limited | Professional & scientific | 2020 |
| Beaucorp Ltd | Administrative & support | 2023 |
| Beaumont Design Services Ltd | Information & communication | 2008 |
| Beaumont Gold Ltd | Financial services | 2022 |
| Beaumont-Law Estates Ltd | Real estate | 2021 |
| Beautiful Barnets Limited | Wholesale & retail | 2017 |
| Beautiful Candle Company Limited | Manufacturing | 2024 |
| Beaven Brands Limited | Professional & scientific | 2016 |
| Becket Court (Worting) Ltd | Households | 1987 |
| Beckys Beezzzs Limited | Agriculture & fishing | 2014 |
| Bedale Dental Practice Limited | Health & social care | 2006 |
| BEE Gentle Limited | Wholesale & retail | 2021 |
| BEE Good Group Limited | Wholesale & retail | 2022 |
| BEE Innovative Limited | Professional & scientific | 2022 |
| Beech Tree (Overton) Limited | Health & social care | 2017 |
| Beech Tree Enterprises Limited | Administrative & support | 2009 |
| Bees.Keys Ltd | Administrative & support | 2023 |
| Beggarwood Home Solutions Limited | Construction | 2019 |
| Beks Properties Limited | Real estate | 2024 |
| Bekstech Consulting Limited | Information & communication | 2013 |
| BEL Assis Limited | Professional & scientific | 2015 |
| Belasko Corporate 2 UK Limited | Administrative & support | 2021 |
| Belasko Corporate UK Limited | Administrative & support | 2021 |
| Belasko UK Limited | Administrative & support | 2019 |
| Belford Care Limited | Health & social care | 2002 |
| Bell and Friends Home Help Ltd | Health & social care | 2026 |
| Bellamy Roberts LLP | | 2003 |
| Bellamy Roberts Partners Ltd | Professional & scientific | 2022 |
| Bellcredit Limited | Health & social care | 2014 |
| Belle SOL Solutions Limited | Water & waste | 2020 |
| Bellis Property Ltd | Administrative & support | 2023 |
| Bellmore Homes Limited | Construction | 2010 |
| Bemillion Limited | Administrative & support | 2019 |
| Bemocare Limited | Health & social care | 2018 |
| Bemore Logistics Ltd | Water & waste | 2026 |
| BEN Cresswell Ltd | Health & social care | 2021 |
| BEN Cummings Golf Limited | Arts & recreation | 2008 |
| BEN Davis Building Ltd | Construction | 2022 |
| BEN Hand Build Ltd | Construction | 2013 |
| Ben's Burger's Limited | Hospitality | 2024 |
| Benchstone Ltd | Administrative & support | 2010 |
| Bendicks (Mayfair) Limited | Professional & scientific | 1933 |
| Benefit Solutions UK Limited | Professional & scientific | 2023 |
| Benton Care Limited | Health & social care | 2013 |
| Beran Art Ltd | Wholesale & retail | 2024 |
| Berendsen Finance Limited | Professional & scientific | 1996 |
| Berendsen Limited | Financial services | 1980 |
| Berendsen Nominees Limited | Professional & scientific | 1928 |
| Berff Ltd | Real estate | 2023 |
| Berkshire Design & Build Ltd | Construction | 2025 |
| Berkshire Gates Limited | Extraterritorial | 2022 |
| Berkshire Pressure Cleaning Ltd | Administrative & support | 2025 |