| Astra House Brighton Limited | Households | 2004 |
| Aswim UK Ltd | Education | 2018 |
| Athena HR Limited | Administrative & support | 2015 |
| Atlantic House (Flats) Limited | Households | 1973 |
| Atmoso Limited | Information & communication | 2010 |
| Auctioneers Kitchen Ltd | Hospitality | 2023 |
| Avalona Software Services Ltd | Information & communication | 2014 |
| Aviatepro Services Ltd | Wholesale & retail | 2024 |
| Avon-Dynamic Calibration Limited | Construction | 2004 |
| AW Housing Ltd | Real estate | 2024 |
| AWJ Property Assets Limited | Real estate | 2025 |
| AWJ Property Limited | Real estate | 2020 |
| Aylwin House Limited | Extraterritorial | 2013 |
| Aynsley Court Management Limited | Households | 1975 |
| B H Property Resources Limited | Real estate | 2021 |
| B. Dancy Roofing Company Limited | Construction | 2003 |
| Balley Design Limited | Professional & scientific | 2005 |
| Baltic Arches Ltd | Real estate | 2025 |
| Bandwidth Events Limited | Information & communication | 2024 |
| Baraki Beads Limited | Wholesale & retail | 2025 |
| Bardeli Supplies Ltd | Wholesale & retail | 2008 |
| Baroque Bespoke Jewellery Limited | Manufacturing | 2006 |
| Batstone Roofing Services Ltd | Construction | 2014 |
| Bay House Seaford Limited | Households | 2007 |
| Bctp Ltd | Public administration | 2025 |
| BE Electric Ltd | Construction | 2013 |
| Beachpad Holdings Limited | Real estate | 2015 |
| Beagle Restaurant Co. Limited | Hospitality | 2022 |
| Beaumont Care (Aldershot) Ltd | Health & social care | 2015 |
| Beaumont Village (Aldershot) Ltd | Real estate | 1999 |
| Beauty by Clair Ltd | Other services | 2026 |
| Bellwood Joinery and Building Limited | Construction | 2022 |
| BEN Mendoza Training Limited | Arts & recreation | 2021 |
| Bengal Lily Ltd | Hospitality | 2023 |
| Benham Court Residents Limited | Professional & scientific | 1999 |
| Benny and Berry Nutrition Ltd | Health & social care | 2019 |
| Bert's Detailing Ltd | Wholesale & retail | 2025 |
| Bertie and BOW Entertainment CIC | Arts & recreation | 2026 |
| Berties Brushes Limited | Construction | 2005 |
| Bespoke Defenders Motor Company Ltd | Wholesale & retail | 2024 |
| Bespoke for YOU Limited | Administrative & support | 2017 |
| Best of Buddies Ltd | Health & social care | 2014 |
| Betintel Ltd | Professional & scientific | 2025 |
| BH Utilities Limited | Construction | 2011 |
| Big Boys Toys Limited | Wholesale & retail | 2007 |
| Bigalf Ltd | Construction | 2021 |
| Bilbie Studio Ltd | Professional & scientific | 2009 |
| Bindreley Limited | Households | 2001 |
| Binuz Boutique Ltd | Wholesale & retail | 2016 |
| Birdy Agency Ltd | Professional & scientific | 2021 |
| Bishco Plumbing & Heating Ltd | Construction | 2014 |
| Biss Ltd | Professional & scientific | 2016 |
| Bitelink Ltd | Information & communication | 2025 |
| Bjdms Ltd | Education | 2013 |
| Black Bear Electrical Ltd | Construction | 2023 |
| Blend Creative Consultancy Ltd | Professional & scientific | 2010 |
| BLN Ltd | Hospitality | 2026 |
| Blockbill Ltd | Transport & logistics | 2020 |
| Bloom Global Outsourcing UK Limited | Administrative & support | 2024 |
| Blue Aura Property 2 Ltd | Real estate | 2025 |
| Blue Sparks Limited | Construction | 2008 |
| Bluemoon Event Services Ltd | Other services | 2020 |
| BM Construction (Sussex) Limited | Construction | 2019 |
| Boilers of Sussex Ltd | Construction | 2023 |
| Bolney Nursery Limited | Agriculture & fishing | 1986 |
| BOM Tech Ltd. | Manufacturing | 2017 |
| BOO BOO Bear Catering Ltd | Hospitality | 2023 |
| BOO BOP Ltd | Wholesale & retail | 2018 |
| Bore Property Sussex Ltd | Real estate | 2026 |
| Boxx Communications Ltd | Information & communication | 2010 |
| Boyle Fintech Ltd | Financial services | 2023 |
| Brace Workwear Ltd | Manufacturing | 2026 |
| Bradley Strategy Group Ltd | Professional & scientific | 2024 |
| Branching OUT Adventures Ltd | Arts & recreation | 2014 |
| Brand Famous Limited | Professional & scientific | 2013 |
| Break Nation Limited | Wholesale & retail | 2026 |
| Brightbloom Training Ltd | Education | 2016 |
| Brightec Group Ltd | Information & communication | 2024 |
| Brightec Ltd | Information & communication | 2006 |
| Brighton & Hove Locksmith Training Ltd | Education | 2023 |
| Brighton & Hove Locksmiths Ltd | Construction | 2022 |
| Brighton and Hove Bricklaying Limited | Construction | 2026 |
| Brighton and Hove Electrical Limited | Construction | 2026 |
| Brighton and Hove Plumbing and Heating Ltd | Construction | 2023 |
| Brighton Blue Limited | Professional & scientific | 2023 |
| Brighton Blue Property Ltd | Extraterritorial | 2024 |
| Brighton City Airport Ltd | Transport & logistics | 2013 |
| Brighton Flower Company Ltd | Wholesale & retail | 2018 |
| Brighton Food Tours Limited | Hospitality | 2026 |
| Brighton Inventory Group Ltd | Households | 2021 |
| Brighton Padel Coaching Ltd | Education | 2025 |
| Brightside Renovations Limited | Construction | 2018 |
| Brightstone Paving Company Limited | Construction | 1968 |
| Britannia House (Shoreham) RTM Company Limited | Real estate | 2025 |
| Broadwater Roofing Ltd | Construction | 2022 |
| Broadway Store Plus Ltd | Wholesale & retail | 2026 |
| Bruce Jackson Film Services Limited | Information & communication | 2012 |
| Brunswick Properties Limited | Real estate | 2025 |
| BUD Gallimore Limited | Information & communication | 2018 |
| Built to Succeed Ltd | Professional & scientific | 2020 |