| Batterfly Ltd | Hospitality | 2022 |
| Battersea Electrics Ltd | Construction | 2005 |
| Battistuzzi Ltd | Transport & logistics | 2024 |
| BAV Services Limited | Wholesale & retail | 2022 |
| Bayaa Ltd | Real estate | 2023 |
| BB3 Advertising Ltd | Professional & scientific | 2020 |
| BD Design Studio Limited | Arts & recreation | 2010 |
| BE Art Consulting Limited | Information & communication | 2005 |
| BE Happy Yoga and Wellness Ltd | Arts & recreation | 2025 |
| Beast Titan Labs Ltd | Information & communication | 2026 |
| Beaufort House (Wimbledon) Freehold Limited | Real estate | 2008 |
| Beaufort House Management Company Limited | Households | 1987 |
| Beaufoy Homes Limited | Construction | 2015 |
| Beautific Inc Permanent Makeup Ltd | Other services | 2025 |
| Beauty Access Limited | Other services | 2023 |
| Beauty Access London Limited | Other services | 2025 |
| Beauty Box by Christine Ltd | Other services | 2018 |
| Beavers Lane Residential Management Company (Phase 3) Limited | Households | 2013 |
| Beckers' Pets Limited | Other services | 2024 |
| Beckers' Properties Limited | Real estate | 2024 |
| Becketts Place Residents Limited | Households | 1984 |
| Bedford Hotel Limited | Hospitality | 2026 |
| BEE Human Limited | Professional & scientific | 2025 |
| BEE Naturelle Limited | Wholesale & retail | 2011 |
| Beech Court (Surbiton) Residents Association Limited | Households | 2000 |
| Beech Industries Limited | Information & communication | 2010 |
| Beehive Property Group Global Ltd | Information & communication | 2024 |
| Beereco Limited | Households | 2018 |
| Belharbour Ltd | Professional & scientific | 2026 |
| Bellanima Ltd | Hospitality | 2023 |
| BELLANIMA23 Limited | Hospitality | 2026 |
| Bellum Advisory Services Limited | Professional & scientific | 2024 |
| Belsay Ltd | Wholesale & retail | 2000 |
| Belvedere Court Residents Association Limited | Households | 1958 |
| BEN Newall Creative Ltd | Arts & recreation | 2022 |
| Benaiah Properties Ltd | Real estate | 2020 |
| Benbow Invest Limited | Financial services | 2023 |
| Benchmark Home Renovations Ltd | Construction | 2026 |
| Berkeley Court (Surbiton) Management Company Limited | Real estate | 1980 |
| Berry & Co Publishing Limited | Information & communication | 2004 |
| Berrylands Accountants Ltd | Professional & scientific | 2019 |
| Berrylands Autocare Ltd | Wholesale & retail | 2012 |
| Berrylands Business Services Ltd | Professional & scientific | 2011 |
| Berrylands Investments Limited | Real estate | 2013 |
| Berrylands Lodge Residents Association Limited | Households | 1969 |
| Berrylands News (PVT) Limited | Wholesale & retail | 2025 |
| Berrylands News Limited | Wholesale & retail | 2024 |
| Berrylands Properties Ltd | Real estate | 2023 |
| Berrylands Property Maintenance Limited | Construction | 2008 |
| Berserker Consulting Limited | Hospitality | 2026 |
| Bespoke OPS Ltd | Wholesale & retail | 2023 |
| Bespoke Psychology Ltd | Health & social care | 2018 |
| Best Halal Meat (Tolworth) Ltd | Wholesale & retail | 2016 |
| Best One Retail Ltd | Wholesale & retail | 2014 |
| Beth Model Management Ltd | Professional & scientific | 2019 |
| Bethany Lodge (MGT) Limited | Financial services | 2008 |
| BEV Beck TC Limited | Administrative & support | 2024 |
| Beveridge Air Freight Ltd | Transport & logistics | 2023 |
| Bexley Thomas Ltd | Professional & scientific | 2016 |
| Beyond Cars Limited | Wholesale & retail | 2022 |
| Beyond Matter Ltd | Professional & scientific | 2025 |
| BGB Fitness Ltd | Arts & recreation | 2019 |
| BH (Birnbeck) Limited | Construction | 2011 |
| Bhumitronics Limited | Information & communication | 2015 |
| Big Belly Golf CIC | Education | 2025 |
| Big Business Developments Limited | Real estate | 1998 |
| Big Canyon Club Ltd | Arts & recreation | 2025 |
| Big EYE Engineering Limited | Construction | 2004 |
| Big UP Productions Limited | Arts & recreation | 1999 |
| Bigfoot Facilities Ltd | Administrative & support | 2012 |
| Bill Brayer Design Limited | Administrative & support | 2011 |
| Bill Films Limited | Information & communication | 2013 |
| Bill Films Productions Limited | Information & communication | 2013 |
| BIM Energy Consulting Limited | Professional & scientific | 2026 |
| Biods Consulting Limited | Information & communication | 2021 |
| Biologeco Limited | Water & waste | 2020 |
| Biomm Limited | Professional & scientific | 2025 |
| Birchall Consult Limited | Administrative & support | 2020 |
| Birdhouse Web Consultants Ltd | Information & communication | 2016 |
| Birds and Wildlife Limited | Administrative & support | 2021 |
| Bishop & Blume Limited | Real estate | 2023 |
| Bitgraze Ltd | Information & communication | 2016 |
| Bitou Ltd | Construction | 2022 |
| BK Trader Group Ltd | Water & waste | 2022 |
| BKR Global Ltd | Administrative & support | 2021 |
| BL Advisory & Consulting Limited | Financial services | 2019 |
| Black Swan Cafe Limited | Hospitality | 2022 |
| Blackford Stroud Consultants Limited | Real estate | 2016 |
| Blackfriars (UK) Ltd | Professional & scientific | 2013 |
| Blackwall Digital Limited | Administrative & support | 2025 |
| Blazing Productions Ltd | Information & communication | 2014 |
| Blend & Blade Ltd | Other services | 2025 |
| Blinktown Group Ltd | Financial services | 2021 |
| Blissett Communications Limited | Professional & scientific | 2026 |
| Blocktemper Ltd | Information & communication | 2025 |
| Bloomin Marvellous Landscapes Ltd | Administrative & support | 2005 |
| Blue Arrow Care Limited | Health & social care | 2016 |
| Blue Flamingo Holdings Ltd | Financial services | 2025 |
| Blue Flamingo Investments Ltd | Real estate | 2020 |
| Blue Flamingo Solutions Ltd | Information & communication | 2017 |