| Ban.Gl Ltd | Other services | 2010 |
| Banes Padel (Holdings) Limited | Arts & recreation | 2026 |
| Banes Padel Limited | Arts & recreation | 2026 |
| Bangaranga Ltd | Wholesale & retail | 2026 |
| Banks Wood and Partners (Brentwood) Limited | Professional & scientific | 1986 |
| Banks Wood and Partners Holdings Limited | Financial services | 2022 |
| Banns & Plans Limited | Other services | 2024 |
| Banters Lane Limited | Real estate | 2023 |
| Banters Lane Management Limited | Construction | 2023 |
| Bantham Technologies Limited | Information & communication | 2008 |
| BANTU9JA Ltd | Wholesale & retail | 2025 |
| Banyi Ventures Limited | Administrative & support | 2017 |
| Bar Dionysus Ltd | Wholesale & retail | 2021 |
| Baraqah Trading Ltd | Wholesale & retail | 2025 |
| Barback Factory Global Limited | Administrative & support | 2016 |
| Barbary Inn Ltd | Hospitality | 2024 |
| Barber Kenan Limited | Other services | 2026 |
| Barclay Construction Services Limited | Construction | 2004 |
| Barcroft Mills Limited | Professional & scientific | 2025 |
| Barford Management Limited | Real estate | 1984 |
| Barham HGV Ltd | Transport & logistics | 2024 |
| Barkarama Limited | Professional & scientific | 2009 |
| Barke Craft Bakery Ltd | Wholesale & retail | 2023 |
| Barking, Dagenham and Havering Local Medical Committee Limited | Health & social care | 2008 |
| Barn Cars Limited | Wholesale & retail | 2016 |
| Barn Property Management Limited | Real estate | 2021 |
| Barney Developments Ltd | Construction | 2017 |
| Barpad Limited | Real estate | 2022 |
| Barrack Ridge Vineyard Ltd | Agriculture & fishing | 2023 |
| Barrett Environmental Services Limited | Construction | 2002 |
| Barringtons Group Limited | Other services | 2019 |
| Barry's Meat Market Limited | Wholesale & retail | 2008 |
| Barryscourt Civils Limited | Construction | 2010 |
| Bartlett Homes and Developments Limited | Construction | 2014 |
| Basic Connections Ltd | Wholesale & retail | 2013 |
| Basildon Service Station Ltd | Wholesale & retail | 2019 |
| Basildon Softplay and Laser Ltd | Administrative & support | 2016 |
| Bath Padel Club Limited | Arts & recreation | 2026 |
| Baymans Capital Ltd | Professional & scientific | 2021 |
| Baymans Wood Management Limited | Real estate | 1986 |
| Bays Academy Ltd | Administrative & support | 2026 |
| Bazardi Ltd | Hospitality | 2021 |
| BB Alarms Ltd | Construction | 2022 |
| BB Specialist Consultants Ltd | Other services | 2021 |
| BBA Electrical Ltd | Construction | 2022 |
| BC Design Services Ltd | Professional & scientific | 2020 |
| BCD Home Improvements Ltd | Construction | 2020 |
| BCF Management Ltd | Professional & scientific | 2024 |
| BCG International Limited | Other services | 2023 |
| BD Services C&G Ltd | Administrative & support | 2020 |
| BDA Audit Limited | Other services | 1989 |
| BDC Aggregates Limited | Construction | 2016 |
| BDESIGN7 Construction Ltd | Construction | 2024 |
| BDESIGN7 Ltd | Professional & scientific | 2012 |
| Bdkt (Europe) Ltd | Education | 2002 |
| BE 3 Ltd | Professional & scientific | 2016 |
| BE More Ralph Ltd | Wholesale & retail | 2026 |
| Be-Sure Properties Limited | Professional & scientific | 2009 |
| Beamridge Ltd | Construction | 2013 |
| Bean Around Town Limited | Hospitality | 2017 |
| Bear Performing Arts Ltd | Arts & recreation | 2023 |
| Beard Culture London Ltd | Wholesale & retail | 2019 |
| Bearents Ltd | Arts & recreation | 2016 |
| Bearing Accountancy Services Ltd | Professional & scientific | 2010 |
| Beat Aviation Limited | Transport & logistics | 2024 |
| Beauden’S Ltd | Wholesale & retail | 2025 |
| Beauforte Growth Ltd | Real estate | 2006 |
| Beauforte Limited | Professional & scientific | 1984 |
| Beaulieu College Ltd | Education | 2025 |
| Beaulieu Park E (Chelmsford) Management Limited | Households | 2021 |
| Beaulieu Park M&N (Chelmsford) Management Limited | Households | 2021 |
| Beaulieu Park O&P (Chelmsford) Management Limited | Households | 2022 |
| Beaumont Coffee Club Limited | Hospitality | 2019 |
| Beautiful Life London Limited | Other services | 2019 |
| Beauty 88 Limited | Wholesale & retail | 2017 |
| Beauty Hideout Skin Ltd | Other services | 2021 |
| Beauty Labs Group Ltd | Wholesale & retail | 2020 |
| Beauty Rooms Brentwood Ltd | Other services | 2025 |
| Beauvoir Asset Management Limited | Real estate | 2019 |
| Beauwood Joinery Limited | Manufacturing | 2000 |
| Because Experiential Marketing Ltd | Professional & scientific | 2008 |
| Becker Industrial Services Limited | Construction | 1997 |
| Becket Place (Brentwood) Management Company Limited | Households | 1994 |
| Beckley Meadows Ltd | Real estate | 2011 |
| Bedlars Green 2025 UK Ltd | Construction | 2024 |
| Bedsoft Limited | Extraterritorial | 2009 |
| BEE Bold Beauty Limited | Information & communication | 2018 |
| Beecham Investments Limited | Financial services | 2021 |
| Beechgrove (Sunninghill) Management Company Limited | Households | 2020 |
| Begb Ltd | Wholesale & retail | 2026 |
| Beijing Garden Takeaway Limited | Hospitality | 2012 |
| Bela Interactive Ltd | Transport & logistics | 2004 |
| Belda Holdings Ltd | Financial services | 2023 |
| Belda Properties Limited | Real estate | 2023 |
| Bell Build Data Centre Services Limited | Construction | 2023 |
| Bell Build Group Limited | Construction | 2020 |
| Bell Build Limited | Construction | 2011 |
| Bella Bronze Ltd | Other services | 2022 |
| Bellagio Bridal Limited | Transport & logistics | 2007 |
| Belljar Ltd | Administrative & support | 2016 |