| Bluebear Studios Ltd | Information & communication | 2023 |
| Bluebird Court Limited | Real estate | 2019 |
| Bluebird Developments Limited | Information & communication | 2014 |
| Bluebourne Trading Limited | Other services | 2021 |
| Bluebox Internet Communications Limited | Information & communication | 2015 |
| Bluedgespace Ltd | Professional & scientific | 2024 |
| Bluefire Property Services Limited | Real estate | 2009 |
| Blueguard IT Ltd | Information & communication | 2025 |
| Bluemoon Massages Ltd | Other services | 2024 |
| Blueprint Consultancy Services Limited | Information & communication | 1997 |
| Blueprint Mgmt Ltd | Information & communication | 2019 |
| Blueright Limited | Transport & logistics | 2026 |
| Bluesbros Events Limited | Hospitality | 2018 |
| Bluestar Property Holdings Ltd | Real estate | 2019 |
| Bluesunflowerproperties Ltd | Real estate | 2022 |
| Bluetide Digital Ltd | Professional & scientific | 2023 |
| Bluewave Thetford Limited | Hospitality | 2017 |
| Bluewood Retreats Ltd | Hospitality | 2025 |
| Bluupepper Ltd | Wholesale & retail | 2020 |
| BLY Properties Ltd | Real estate | 2024 |
| Blythe and Batoum Limited | Real estate | 2016 |
| BM Scaffolding Ltd | Construction | 2011 |
| BM UK Services Limited | Construction | 2007 |
| Bmak Apartments Ltd | Real estate | 2021 |
| BMC Loft Conversions Ltd | Construction | 2022 |
| BMC UK Property Ltd | Real estate | 2022 |
| BND Developments Limited | Real estate | 2006 |
| Boat Life Electrics Ltd | Manufacturing | 2025 |
| Boatability (Portsmouth) Limited | Education | 2011 |
| Boatbreakers Ltd | Extraterritorial | 2012 |
| Boats Group International UK Limited | Professional & scientific | 2020 |
| Boats.Com Europe Ltd | Information & communication | 2011 |
| Boba Bloom Portsmouth Limited | Hospitality | 2023 |
| Bobatm Limited | Wholesale & retail | 2011 |
| Body Beauty Basics Ltd | Other services | 2013 |
| Bodyworks Carbon Fibre Ltd. | Manufacturing | 2017 |
| BODYWORX360 Health & Fitness Club Ltd | Arts & recreation | 2015 |
| Bognor Coastal Alliance PCN Limited | Health & social care | 2023 |
| Bognor Regis Health Limited | Health & social care | 2003 |
| Boiler Heat and Plumbing Ltd | Construction | 2023 |
| Boland Companies Ltd | Education | 2018 |
| Bold Internet Limited | Information & communication | 2002 |
| Bolney Grange Business Park (Management) Limited | Real estate | 1996 |
| Bolt Sound & Lighting Limited | Construction | 2024 |
| Bolu Onisesi Private Hire Ltd | Wholesale & retail | 2026 |
| Bond Consult Limited | Health & social care | 2020 |
| Bond Street Motor Company Limited | Wholesale & retail | 2025 |
| Bonds Dry-Lining Ltd | Construction | 2022 |
| Bonds Property Developments Ltd | Real estate | 2024 |
| Bones Roofing Ltd | Construction | 2005 |
| Boogie Mites Community Projects CIC | Administrative & support | 2013 |
| Boogie Mites UK Ltd | Education | 2007 |
| Book Events South Limited | Other services | 2019 |
| Boom Youth Holdings Ltd | Hospitality | 2023 |
| Booshy Bombs Ltd | Wholesale & retail | 2020 |
| Boredtender Ltd | Wholesale & retail | 2025 |
| Boris Properties Ltd | Real estate | 2022 |
| Born Gifted Limited | Wholesale & retail | 2002 |
| Boro Bar 1944 Limited | Hospitality | 2025 |
| Borrow Investments Limited | Real estate | 1960 |
| Boss Cleaning Ltd | Other services | 2025 |
| Boss Portsmouth Barber Ltd | Other services | 2025 |
| Boss Property Services Limited | Real estate | 2022 |
| Bossuot's Esthetique's Ltd. | Other services | 2024 |
| Bostock House Limited | Real estate | 2024 |
| Bosun Protection Ltd | Hospitality | 2021 |
| Botanical Resources Limited | Wholesale & retail | 2005 |
| Botleigh Grange Trading Limited | Administrative & support | 2015 |
| Boujettif Beauty Ltd | Other services | 2024 |
| Boulevard Property Holdings Limited | Real estate | 2016 |
| Bound by Resin Limited | Construction | 2021 |
| Bourne Electrical Projects Ltd | Construction | 2017 |
| Bourne IT Ltd | Information & communication | 2012 |
| Bourne Richmond Property Limited | Construction | 2024 |
| Bourne Sportsmed Ltd | Health & social care | 2010 |
| Bournemouth Prestige Bathrooms Ltd | Construction | 2024 |
| Boutink Limited | Other services | 2015 |
| Boutique Escapes Ltd | Real estate | 2020 |
| BOUTIQUE146 Ltd | Wholesale & retail | 2025 |
| Bowden Publishing Limited | Information & communication | 2018 |
| Bowepark Efrbs Ltd | Real estate | 2008 |
| Bowepark Limited | Manufacturing | 2001 |
| Bowsprit International Limited | Professional & scientific | 2015 |
| Box Brew Ltd | Hospitality | 2021 |
| Boxing Awards Limited | Arts & recreation | 2007 |
| Boyle's Brickwork (South) Ltd | Construction | 2022 |
| BP Masonry Ltd | Construction | 2024 |
| BP2015 (Kidbrook) LLP | | 2016 |
| BPA Pathways CIC | Health & social care | 2023 |
| Bradfield Property Investments Limited | Real estate | 2024 |
| Bradfield Property Residential Limited | Real estate | 2025 |
| Brads BUG Bounties Ltd | Information & communication | 2026 |
| Brainboxit Limited | Information & communication | 2018 |
| Braishfield Support Ltd | Administrative & support | 2014 |
| Brake Doctor Ltd | Other services | 2026 |
| Bramsden Court (Southsea) Limited | Hospitality | 1968 |
| Brand Activations & Design Ltd | Professional & scientific | 2025 |
| Brand Logic Europe Limited | Wholesale & retail | 2006 |
| Brand Recruit Limited | Administrative & support | 2017 |
| Brandon House RTM Company Limited | Hospitality | 2012 |