| Bangkok WOK WOK Limited | Hospitality | 2023 |
| Barbados Management (Bexhill) Limited | Households | 1979 |
| Barleyfield Property Solutions Ltd | Real estate | 2025 |
| Barls Consultancy Ltd | Information & communication | 2025 |
| Barrytalent Ltd | Wholesale & retail | 2025 |
| Bass Beauty Limited | Other services | 2010 |
| Baston Lodge Freehold Ltd | Households | 2019 |
| Battle Aviation Services Limited | Extraterritorial | 2002 |
| Battle Bakes and Cakes Ltd | Manufacturing | 2018 |
| Battle Controls Ltd | Construction | 2025 |
| Battle Group Ltd | Professional & scientific | 2026 |
| Battle Helicopters Limited | Transport & logistics | 2000 |
| Battle Property Investment Ltd | Real estate | 2016 |
| Battlecat Studios Limited | Information & communication | 2013 |
| Bayvue Limited | Wholesale & retail | 2021 |
| Bbrb Power Limited | Construction | 2017 |
| BC Build & Ground Works Ltd | Construction | 2022 |
| BE Sweet 2 Limited | Hospitality | 2020 |
| Beach Towers Limited | Households | 2004 |
| Beachpoint Accommodation Ltd | Hospitality | 2026 |
| Beaming Ltd | Information & communication | 2004 |
| Beaulieu Farm Campsite Ltd | Hospitality | 2024 |
| Beaulieu Farm Ltd | Wholesale & retail | 2012 |
| Beaulieu Lodge Owners Association Limited | Households | 1994 |
| Beauty Warehouse Ltd | Wholesale & retail | 2014 |
| BEE Clean Hastings Ltd | Administrative & support | 2023 |
| Beech Hill Court Management Limited | Households | 1981 |
| Beecham Properties South Ltd | Real estate | 2019 |
| Beleuram Ltd | Information & communication | 2024 |
| Belgrave Court (Bexhill) Limited | Households | 1985 |
| Bella Nails ST. Leonards-On-Sea Limited | Other services | 2026 |
| Bello DE Nonna Ltd | Hospitality | 2018 |
| BEN Smith Appliance Repairs Ltd | Other services | 2025 |
| BEN Smith Recon Ltd | Other services | 2026 |
| Bendle Property Ltd | Real estate | 2017 |
| Bennett Services Group Ltd | Administrative & support | 2025 |
| Berfu 6234 Limited | Hospitality | 2026 |
| Bespoke Case Management Ltd | Professional & scientific | 2020 |
| Bespoke Luxury Boxes Ltd | Manufacturing | 2023 |
| Bess Bite Ltd | Hospitality | 2025 |
| Better English Limited | Administrative & support | 2015 |
| Better Homes Property Group Ltd | Real estate | 2025 |
| Bewl Bridge Rowing Club | Arts & recreation | 2008 |
| Bexhill Jump Park CIC | Arts & recreation | 2022 |
| Beyond Measure Records Ltd | Manufacturing | 2018 |
| Beyond Measurements Ltd | Wholesale & retail | 2025 |
| BGN Developments Limited | Construction | 2010 |
| BGR Holdings Limited | Financial services | 2024 |
| BH Productions Ltd | Other services | 2023 |
| Big Juicy Promotions Limited | Administrative & support | 2022 |
| Big Sister Projects Limited | Professional & scientific | 2022 |
| Big Sisters Academy CIC | Education | 2026 |
| Big YIN Gallery Limited | Wholesale & retail | 2021 |
| Bilkis Limited | Hospitality | 2026 |
| Bill Coney Building & Development Ltd | Construction | 2018 |
| Billy the G.O.A.T Ltd | Information & communication | 2025 |
| Bird & Branch Ltd | Manufacturing | 2015 |
| Birthday BOY Ltd | Professional & scientific | 2017 |
| Bison Bushcraft Ltd | Wholesale & retail | 2022 |
| BJB Digital Ltd | Professional & scientific | 2024 |
| Blackford Group (SE) Ltd | Construction | 2019 |
| Blackthorn & Bramble Ltd | Professional & scientific | 2026 |
| Bliss Uckfield Limited | Other services | 2017 |
| Blockchain Integrated Technology Systems Ltd | Professional & scientific | 2019 |
| Blockchain Telephony Ltd | Information & communication | 2025 |
| Bloomwit Floral Design Ltd | Wholesale & retail | 2025 |
| Blossom Property Holdings Ltd | Real estate | 2017 |
| Blow Hair Co Ltd | Other services | 2026 |
| Blue Diamond Cargo Limited | Extraterritorial | 2023 |
| Blue Ice Tiger Limited | Wholesale & retail | 2007 |
| Blue Industries Group Limited | Construction | 2023 |
| Blue Sea Asset Management Ltd | Administrative & support | 2022 |
| Bluehouse Consulting Limited | Other services | 2014 |
| Blueprint Construction Building & Electrical Services Ltd | Construction | 2024 |
| Bluestone Electrical Ltd | Construction | 2017 |
| Boardlets Limited | Real estate | 2024 |
| Bokken Ltd | Construction | 2020 |
| Bombshell Cosmetics Limited | Wholesale & retail | 2024 |
| Bounce & Play Hastings Ltd | Hospitality | 2025 |
| Boxer Scaffolding Limited | Administrative & support | 2002 |
| Braceworld Limited | Professional & scientific | 2002 |
| Brad Irwin Consulting Ltd | Professional & scientific | 2024 |
| Braidmade Films Ltd | Information & communication | 2006 |
| Bramley's Farm Shop Ltd | Manufacturing | 2024 |
| Brandkits Ltd | Professional & scientific | 2016 |
| Breach LLP | | 2016 |
| Breach Theatre | Arts & recreation | 2019 |
| Briar Vale Flat Management Limited | Administrative & support | 1991 |
| Brick Haus Ltd | Real estate | 2019 |
| Bricks From the Kiln Ltd | Information & communication | 2024 |
| Bridgeways Consultancy Services South Ltd | Administrative & support | 2025 |
| Bright White Light Limited | Administrative & support | 2014 |
| Brightelectrical South Ltd | Construction | 2025 |
| Brighton Photo Fringe | Arts & recreation | 2012 |
| Brittany Corner Management Company Limited | Other services | 2002 |
| Brittany Court Management Limited | Households | 2022 |
| Brockbox Properties Ltd | Real estate | 2025 |
| Brookman Plumbing & Heating Limited | Construction | 2024 |
| Brookman Property Investment Limited | Real estate | 2026 |
| Brookson (5115L) Limited | Administrative & support | 2007 |