| Bar Finn's Ltd | Hospitality | 2025 |
| Barber Station EST. 1989 Ltd | Other services | 2025 |
| Barefoot Projects Limited | Arts & recreation | 2025 |
| Bark and Brush Limited | Other services | 2022 |
| Barked About Ltd | Manufacturing | 2025 |
| Barn Lodge Childcare Ltd | Health & social care | 2013 |
| Barnacle Labs Ltd | Information & communication | 2022 |
| Barnes Memorials Limited | Other services | 2013 |
| Barry Catlett Limited | Professional & scientific | 2016 |
| Barton & Co Limited | Other services | 2013 |
| BAT & Ball Ltd | Wholesale & retail | 2013 |
| BAT and Ball Property Limited | Real estate | 1985 |
| Batchelors Limited | Wholesale & retail | 2013 |
| Bateau Bleu Retail Holdings Limited | Financial services | 2024 |
| Bates Site Services Limited | Professional & scientific | 2017 |
| Bathroom Design Academy Limited | Education | 2021 |
| Battersea Flower Station Limited | Wholesale & retail | 2012 |
| Baumodo Ltd | Information & communication | 2009 |
| Bavco Limited | Financial services | 2000 |
| Bawtrys Estate Management Services Limited | Real estate | 2025 |
| Baxterra Corporate Governance Limited | Real estate | 2020 |
| Bayham Recruitment Ltd | Administrative & support | 2025 |
| Bayham Road (Tunbridge Wells) Management Company Limited | Households | 2015 |
| Bayham Wealth LLP | | 2021 |
| BB Associates Limited | Hospitality | 2023 |
| BCG Building & Construction Services Ltd | Construction | 2025 |
| Bchr Limited | Professional & scientific | 2002 |
| BDP Building Services Limited | Construction | 2024 |
| BDY Limited | Manufacturing | 2019 |
| BE Bronze Limited | Other services | 2025 |
| BE Nimble Ltd | Information & communication | 2010 |
| BE Wealthfluent Ltd | Extraterritorial | 2023 |
| Beacon Property Consultancy Limited | Professional & scientific | 2003 |
| Beacon Rise Travel Ltd | Administrative & support | 2014 |
| Beacons Sports Ltd | Arts & recreation | 2016 |
| Beaconview Developments Limited | Professional & scientific | 1998 |
| Bead Limited | Real estate | 1995 |
| Bear CUB Pictures Ltd | Information & communication | 2020 |
| Bearcroft Consulting Limited | Professional & scientific | 2017 |
| Beau Design London Ltd | Professional & scientific | 2021 |
| Beauty Growth Limited | Wholesale & retail | 2025 |
| Beauty Residence Ltd | Construction | 2019 |
| Beauty Supplier Ltd | Other services | 2020 |
| Beavor Services Limited | Extraterritorial | 1988 |
| Beazles Ltd | Other services | 2017 |
| Beckeloak Limited | Construction | 1992 |
| BED & Biscuits Boarding Ltd | Other services | 2014 |
| BED & Biscuits Daycare Limited | Other services | 2016 |
| Beechin Wood Farm (Platt) Limited | Agriculture & fishing | 2019 |
| Beechwood Advisors Ltd | Professional & scientific | 2023 |
| Beechwood Design and Build Ltd | Construction | 2016 |
| Beer NO Evil Limited | Wholesale & retail | 2017 |
| Bees & Refugees CIC | Agriculture & fishing | 2019 |
| Bees Knees Strategies Ltd | Professional & scientific | 2025 |
| Beffroi Ltd | Professional & scientific | 2025 |
| Begbie,Phillips & Hayley,Limited | Administrative & support | 1922 |
| Beko Studio Ltd | Wholesale & retail | 2026 |
| BEL UK Limited | Wholesale & retail | 1966 |
| Belbec Properties Ltd | Real estate | 2012 |
| Belfort (UK) Limited | Transport & logistics | 2014 |
| Belgeous Food LLP | | 2008 |
| Beliren Ltd | Wholesale & retail | 2026 |
| Bell Court Freehold Limited | Real estate | 2002 |
| Bell Publishing Group Limited | Information & communication | 2024 |
| Bell Publishing Holdings Limited | Financial services | 2024 |
| Bell Publishing Limited | Information & communication | 1999 |
| Bella Rosa Lingerie Ltd | Wholesale & retail | 2022 |
| Bellew Digital Ltd | Professional & scientific | 2025 |
| Bells Heating Limited | Construction | 2010 |
| Belmont Park Residents Limited | Real estate | 1998 |
| Bemo Architecture Ltd | Professional & scientific | 2021 |
| Benedict & Evans Ltd | Administrative & support | 2009 |
| Benella & Co. Limited | Professional & scientific | 2017 |
| Bengal Tyres and Car Wash Ltd | Other services | 2025 |
| Bengreen Limited | Administrative & support | 2020 |
| Benham Consulting Ltd | Administrative & support | 2025 |
| Benjamin Cloke Estates Limited | Real estate | 1934 |
| Benn Stanley Limited | Manufacturing | 2026 |
| Bens Bikes Limited | Wholesale & retail | 2006 |
| Benson Cairns Communications Ltd | Information & communication | 2012 |
| Bentley Co Homes Ltd | Real estate | 2022 |
| Bentley Property Lets Ltd | Real estate | 2024 |
| Berengrave Lane LLP | | 2019 |
| Beresford Cooper Limited | Manufacturing | 2017 |
| Berlin Property Advisors Limited | Construction | 2013 |
| Bernie's Management Consultancy Ltd | Information & communication | 2024 |
| Bespoke Beverages UK Ltd | Wholesale & retail | 2023 |
| Bespoke City Interiors Ltd | Manufacturing | 2026 |
| Bespoke Containers Ltd | Construction | 2021 |
| Bespoke Inclusion Psychology Ltd | Education | 2022 |
| Bespoke Interiors of Sevenoaks Limited | Professional & scientific | 2025 |
| Bespoke Remote Ltd | Information & communication | 2020 |
| Bespoke Window Renovations Ltd | Construction | 2024 |
| Bessels Green Property Limited | Real estate | 2026 |
| Bestek (U.K.) Limited | Manufacturing | 2007 |
| Bestmexico Limited | Hospitality | 1999 |
| Better Body Blackheath Limited | Arts & recreation | 2009 |
| Better Body Facilities Limited | Arts & recreation | 2015 |
| Better Body Group Limited | Arts & recreation | 2019 |
| Better Body Sevenoaks Limited | Arts & recreation | 2015 |