| Backdrop London Limited | Arts & recreation | 2018 |
| Backwaters Ltd | Real estate | 2025 |
| Bacon (Specialist Services) Ltd | Construction | 2013 |
| Bacon Lightning Protection & Maintenance Limited | Construction | 2014 |
| Baddow Joinery Ltd | Manufacturing | 2011 |
| Badgerbeats Limited | Wholesale & retail | 2015 |
| Bailey Jude Associates Ltd | Administrative & support | 2015 |
| Bakbik Holdings Limited | Health & social care | 2024 |
| Baldwin Developments Ltd | Construction | 2021 |
| Balearica Consulting Limited | Professional & scientific | 2026 |
| Ballantyne Pool Ltd | Arts & recreation | 2015 |
| Balmoral Homes (2014) Ltd | Construction | 2014 |
| Balti Vhujon Ltd | Hospitality | 2025 |
| Bamford Legal Engineering Ltd | Information & communication | 2014 |
| Bami Holdings Limited | Other services | 2024 |
| Banyards Property Ltd | Households | 2017 |
| Banyards Taxis Limited | Transport & logistics | 2012 |
| Barber Accountancy Limited | Professional & scientific | 2005 |
| Barber Close (Great Totham) Residents Association Limited | Administrative & support | 2016 |
| Barber Time Maldon Ltd | Other services | 2025 |
| Barbican Property Services Limited | Administrative & support | 2012 |
| Barbits Ltd | Wholesale & retail | 2016 |
| Barbrook and Longhurst Construction Limited | Construction | 2021 |
| Bare Brew Limited | Hospitality | 2016 |
| Bark in Style Boutique Ltd | Other services | 2021 |
| Barley House Investments Ltd | Real estate | 2021 |
| Barleycap Investments Ltd | Real estate | 2026 |
| Barnes Clark Accountants Limited | Professional & scientific | 2021 |
| Barnes Clark Limited | Extraterritorial | 2024 |
| Barry Homes (Developments) Limited | Professional & scientific | 2009 |
| Barry Homes (Investments) Limited | Professional & scientific | 2009 |
| Barts Limited | Extraterritorial | 2007 |
| Bash Buddies Limited | Arts & recreation | 2002 |
| Basil Effects Ltd | Professional & scientific | 2026 |
| Bassnote Sessions Limited | Arts & recreation | 2019 |
| Bay Optical Ltd | Wholesale & retail | 2021 |
| BB Performance Ltd | Arts & recreation | 2014 |
| BBA Developments Limited | Construction | 2017 |
| BC Investment Holdings Limited | Real estate | 2017 |
| Bcih (2022) Limited | Financial services | 2022 |
| BCL Facilities Ltd | Administrative & support | 2022 |
| BD Property Maintenance & Designs Limited | Construction | 2022 |
| BDH Barnes Clark Limited | Professional & scientific | 2025 |
| Beacon Compliance Support Limited | Financial services | 2015 |
| Beacon Hill Court RTM Company Limited | Households | 2019 |
| Beamsmile Limited | Households | 1986 |
| Beauty by Laser Limited | Other services | 2018 |
| Beck-Yoms Limited | Professional & scientific | 2015 |
| Beckingham Business Park Ltd | Professional & scientific | 2021 |
| Beckingham Commercial Investments Limited | Real estate | 2006 |
| Beckingham Park Estates Limited | Real estate | 2024 |
| Beckingham Woodcraft Limited | Manufacturing | 2017 |
| Bedrock Concrete Limited | Manufacturing | 1999 |
| BEE Green Landscape Design & Groundworks Ltd | Administrative & support | 2021 |
| Beech Road Gardens Management Company Ltd | Professional & scientific | 2020 |
| Beech Tree Residential Limited | Real estate | 2024 |
| Beehive Restorations Ltd | Construction | 2005 |
| Beeleigh Investments Limited | Real estate | 2003 |
| Bela Reserva Limited | Construction | 2022 |
| Belford Rose Residential Limited | Real estate | 2023 |
| Bella Films Ltd | Information & communication | 2013 |
| Bellefontaines Jewellers Limited | Wholesale & retail | 2014 |
| BEN Rigby Game Ltd | Agriculture & fishing | 2002 |
| Benbridge Management Limited | Administrative & support | 2004 |
| Benchmark Electrical Operations Limited | Construction | 2012 |
| Bengal Nights Ltd | Hospitality | 2025 |
| Benham (General Engineers) Limited | Manufacturing | 1974 |
| Benham Close Management Company Ltd | Real estate | 2018 |
| Benhec Limited | Financial services | 2011 |
| Benjamin Farmer Limited | Financial services | 2010 |
| Benjamin Investments Limited | Real estate | 2005 |
| Benjamin Motorcycles Limited | Wholesale & retail | 2008 |
| Benthom Limited | Real estate | 2018 |
| Berkeley Street J V Limited | Professional & scientific | 2009 |
| Bespoke Tutors UK Ltd | Education | 2023 |
| Bex's 4X4 Ltd | Wholesale & retail | 2024 |
| Beyond Dreams Co., Ltd | Administrative & support | 2024 |
| BG Appleton Contracts Ltd | Professional & scientific | 2012 |
| BG Bourner Limited | Professional & scientific | 2019 |
| BHH Services Ltd | Financial services | 2025 |
| Bhn.Attar Limited | Arts & recreation | 2020 |
| Big Bear Group Limited | Financial services | 2025 |
| Bill and BEN Landscaping Ltd | Administrative & support | 2024 |
| Bill's Plaice Limited | Hospitality | 2003 |
| Billericay Town Women FC Limited | Arts & recreation | 2023 |
| Bill’S Turf Limited | Administrative & support | 2023 |
| Bird Property Ltd | Real estate | 1999 |
| Bizzy Print Limited | Manufacturing | 1996 |
| BJ & LA Fraser Limited | Other services | 2021 |
| Bktf Consultancy Ltd | Professional & scientific | 2022 |
| Black Dog Boutiques Limited | Wholesale & retail | 2018 |
| Black PIG Catering Limited | Hospitality | 2021 |
| Black Rabbit Maldon Ltd | Hospitality | 2017 |
| Blackman & White Cutting Solutions Ltd | Professional & scientific | 2013 |
| Blackwater Catering Limited | Hospitality | 2013 |
| Blackwater Controls Engineering Limited | Professional & scientific | 2026 |
| Blackwater EAR Care Ltd | Health & social care | 2024 |
| Blackwater Electrical Solutions Ltd | Construction | 2018 |
| Blackwater Engineering Consultancy and Marine Training Limited | Professional & scientific | 2023 |
| Blackwater Facilities Group Limited | Administrative & support | 2026 |