| Augustus Rose Limited | Wholesale & retail | 2012 |
| Aurisspecs Ltd | Professional & scientific | 2025 |
| Authenteak Limited | Extraterritorial | 2015 |
| Automatrics Limited | Professional & scientific | 2006 |
| Avonside Pools Limited | Other services | 2023 |
| AXE Recruitment Limited | Extraterritorial | 2017 |
| AYA Barbers Ltd | Other services | 2023 |
| Aysh Limited | Wholesale & retail | 2026 |
| Azure Tide Limited | Other services | 2025 |
| B. Moore Services Ltd | Construction | 2026 |
| B.M. Russell Limited | Information & communication | 1997 |
| B.Roberts Roofing Services Ltd | Construction | 2013 |
| Baba Balak Nath Enterprises Limited | Information & communication | 2017 |
| Badger Communication Systems Limited | Information & communication | 2016 |
| Badrunisa Ltd | Wholesale & retail | 2018 |
| BAG Tech Systems Ltd | Transport & logistics | 2018 |
| Bailey Fabrications Limited | Manufacturing | 1996 |
| Baize Group Limited | Other services | 2016 |
| BAK Suppliers Ltd | Wholesale & retail | 2025 |
| Bally Care Service Ltd | Health & social care | 2017 |
| Bampass Ltd | Extraterritorial | 2025 |
| Bardon Avenue Limited | Real estate | 2008 |
| Bare Skin Beauty Limited | Wholesale & retail | 2009 |
| Bareboss Ltd | Manufacturing | 2021 |
| Barham Food Ltd | Hospitality | 2024 |
| BARK2SCHOOL Limited | Wholesale & retail | 2016 |
| Barr Chimney Specialists Limited | Construction | 2002 |
| Barroni Ices Limited | Hospitality | 2026 |
| Barry Taylor Engineering Limited | Construction | 2009 |
| Bartlett Consulting and Integration Limited | Administrative & support | 2004 |
| Base Concepts Ltd | Manufacturing | 2025 |
| Basejest Ltd | Information & communication | 1999 |
| Bastion UK Services Limited | Administrative & support | 2020 |
| Bathco Installation Ltd | Construction | 2025 |
| Bawan Hairstyle Limited | Other services | 2021 |
| BB Groundworks Ltd | Construction | 2026 |
| BCI Digital Ltd | Administrative & support | 2016 |
| BCS Composites Ltd | Manufacturing | 2024 |
| BEA Empowered Limited | Professional & scientific | 2025 |
| Beam Reach Limited | Wholesale & retail | 2006 |
| Beam Shades Ltd | Wholesale & retail | 2018 |
| Beamx SVG Ltd | Transport & logistics | 2025 |
| Beaumont Fairhall Limited | Professional & scientific | 2021 |
| Beauty by Proderm Limited | Other services | 2025 |
| Beauty Temple (Gosport) Ltd | Other services | 2019 |
| Beauty Within Ltd | Other services | 2013 |
| Beautybymw Ltd | Other services | 2025 |
| Beckett Chauffeur Services Limited | Transport & logistics | 2017 |
| Being Authentic Limited | Professional & scientific | 2011 |
| Bellville Limited | Financial services | 2020 |
| Bengal Food and Leisure Ltd | Hospitality | 2023 |
| Bengal Hospitality Ltd | Hospitality | 2024 |
| Best Hand Car Wash Gosport Ltd | Other services | 2020 |
| Better Financial Planning Ltd | Administrative & support | 2015 |
| Beveridge Equestrian Limited | Administrative & support | 2016 |
| Beveridge Flooring Limited | Construction | 2005 |
| Beyond Borders Expeditions Limited | Administrative & support | 2025 |
| Bezani's Limited | Real estate | 2024 |
| Big Sharq Ltd | Wholesale & retail | 2026 |
| Bimbus Ltd | Information & communication | 2024 |
| Bingham Property Services Ltd | Real estate | 2022 |
| Bishop Protection Ltd | Administrative & support | 2026 |
| Bismillah Balti Tandoori Ltd | Hospitality | 2021 |
| BK Car Spares Ltd | Wholesale & retail | 2019 |
| Black Bridge Catering Ltd | Wholesale & retail | 2017 |
| Blackball Media Limited | Information & communication | 2008 |
| Blackstone Global Recruitment Ltd | Administrative & support | 2023 |
| Blanky Bear Ltd | Information & communication | 2016 |
| Blendworth Holdings Ltd | Financial services | 2024 |
| Bleu Aura Properties Limited | Real estate | 2025 |
| Blue Door Property Consultants Limited | Professional & scientific | 2024 |
| Blue Tide Fryers Ltd | Hospitality | 2025 |
| Bluebox Energy Ltd | Professional & scientific | 2013 |
| Bluewall IT Ltd | Information & communication | 2020 |
| Blueways Development Limited | Professional & scientific | 2013 |
| BM Transport Services Ltd | Transport & logistics | 2025 |
| Bnj's Garden Patios & Landscaping Ltd | Construction | 2025 |
| BOA Sorte Holdings Limited | Real estate | 2001 |
| Boland Marine Ltd | Professional & scientific | 2024 |
| Bonfa Logistics Ltd | Transport & logistics | 2021 |
| Boro Bar Limited | Hospitality | 2022 |
| Borobo Ltd | Manufacturing | 2018 |
| Borrowdale Properties Limited | Real estate | 2022 |
| Boscombe East Ltd | Wholesale & retail | 2025 |
| Bosedi Ltd | Transport & logistics | 2023 |
| Boutique Tannery Limited | Other services | 2025 |
| Bowers Risk and Resilience Ltd | Administrative & support | 2020 |
| Bowles Bagel Boss Limited | Hospitality | 2025 |
| Boyatt-Wood Launderette Limited | Other services | 2026 |
| Braai-B-Que Boys Ltd | Hospitality | 2023 |
| Brad Nicholls Ltd | Arts & recreation | 2022 |
| Brad Tyler Plumbing & Drain Services Ltd | Water & waste | 2025 |
| Bradleylmedia Limited | Professional & scientific | 2020 |
| Bramley House Management (Gosport) Limited | Households | 1984 |
| Bramsdon & Childs Services Southsea Limited | Administrative & support | 2002 |
| Brand Digitising Limited | Professional & scientific | 2018 |
| Brand-F-Architecture Limited | Professional & scientific | 2004 |
| Brent King Limited | Professional & scientific | 2012 |
| Brent Street Properties Limited | Other services | 1959 |
| Bricks & Mortar Bros Limited | Construction | 2026 |