| Balmy Beauty Limited | Other services | 2013 |
| Bargain Catcher Limited | Wholesale & retail | 2014 |
| Baricane Limited | Professional & scientific | 2012 |
| Baris London Property Limited | Real estate | 2024 |
| Barkway Properties Limited | Real estate | 2026 |
| Barley & Partners Limited | Professional & scientific | 2018 |
| Barley Grove Financial Solutions Limited | Professional & scientific | 2018 |
| Barnes Carpets Limited | Extraterritorial | 2011 |
| Barr Corp Limited | Professional & scientific | 2023 |
| Barrington Glass Ltd | Construction | 2020 |
| Barringtons Project Management Services Ltd | Professional & scientific | 2010 |
| Basam Dahri & Co Limited | Professional & scientific | 2025 |
| Basbow Lane Management Company Limited | Households | 2015 |
| Baskal Lettings Limited | Real estate | 2021 |
| Bath Restoration Company Ltd | Other services | 2020 |
| Bats & Co Homes Ltd | Real estate | 2024 |
| Bats Properties Limited | Construction | 2022 |
| Batteries 4 U Limited | Manufacturing | 2019 |
| Battles Hall Barns Residents Association Limited | Households | 2013 |
| Bay Price Holding Limited | Real estate | 2024 |
| Bay Price Properties Limited | Real estate | 2024 |
| Bay Price Property Management Limited | Real estate | 2024 |
| Baymore Ltd | Water & waste | 2023 |
| BB Security Services Ltd | Administrative & support | 2020 |
| BBG Real Estate Advisers LLP | | 2012 |
| BBG Real Estate London Ltd | Real estate | 2023 |
| BBQ Mates Limited | Wholesale & retail | 2008 |
| Bbright Limited | Construction | 2020 |
| BC Intra Holdings Limited | Financial services | 2026 |
| Bcommerce Services Limited | Information & communication | 2014 |
| BE 4 Limited | Real estate | 2016 |
| BE Fresh Clean Ltd | Administrative & support | 2025 |
| BE More CIC | Other services | 2024 |
| BE Testing & Compliance Limited | Construction | 2025 |
| Beach Road Laundry Ltd | Administrative & support | 2024 |
| Bear & Honey Group Ltd | Wholesale & retail | 2022 |
| Bearbridge Properties Limited | Real estate | 2020 |
| Beard Brothers Hatfield Broad Oak Ltd | Construction | 2020 |
| Beatty-Io Ltd | Information & communication | 2023 |
| Beau Bebe Ltd | Wholesale & retail | 2023 |
| Beauty Designer Ltd | Other services | 2024 |
| Beautybelievable Limited | Other services | 2016 |
| Bebe Cleaning Services Ltd | Administrative & support | 2018 |
| Bedlars Green Ltd | Wholesale & retail | 2025 |
| Beehive 92 Limited | Households | 1992 |
| Beehive Green Limited | Professional & scientific | 2019 |
| Beepmeapp Ltd | Information & communication | 2026 |
| Beer Rebellion Ltd | Hospitality | 2016 |
| Beeyu Ltd | Information & communication | 2025 |
| Being Doing Limited | Other services | 2023 |
| Being Freelance Ltd | Other services | 2022 |
| BEING.HUMAN28 Ltd | Health & social care | 2025 |
| Belbank Carpentry Limited | Construction | 2023 |
| Belbank Contract Services Limited | Construction | 2012 |
| Beldams Gate Management Company Limited | Households | 2000 |
| Belgrave Place Management (1989) Limited | Households | 1990 |
| Bell Guarding Limited | Administrative & support | 1996 |
| Bell Security Limited | Professional & scientific | 1986 |
| Bellgrange Associates Limited | Construction | 2000 |
| BEN Cash Ltd | Professional & scientific | 2026 |
| BEN Kaluza Ltd | Arts & recreation | 2023 |
| Benjw Limited | Professional & scientific | 2024 |
| Benoniprop Limited | Real estate | 2024 |
| Bentfield Mill (Stansted) Limited | Construction | 2022 |
| Berkeley Provident Investments Limited | Financial services | 2023 |
| Bertron Holdings Limited | Real estate | 2014 |
| Bertson & Co Ltd | Construction | 2025 |
| Bespoke Imagination Ltd | Information & communication | 2022 |
| Bespoke Offsite Solutions Limited | Other services | 2008 |
| Best Beds Direct Ltd | Wholesale & retail | 2018 |
| Best Car London Ltd | Wholesale & retail | 2025 |
| Best Mortgages & Protection Limited | Financial services | 2017 |
| Best Price Grimsby Limited | Real estate | 2013 |
| Beta Global Commerce Limited | Wholesale & retail | 2025 |
| Betchu Designs Ltd | Construction | 2020 |
| Betchworth Homes Ltd | Real estate | 2019 |
| Beth Fit Ltd | Arts & recreation | 2021 |
| Better Loft Ladders Limited | Construction | 2003 |
| Betty and the Roses Ltd | Wholesale & retail | 2024 |
| Bey-Perrin Developments Limited | Real estate | 2019 |
| Bey-Perrin Holdings Limited | Real estate | 2019 |
| Bey-Perrin Ltd | Real estate | 2016 |
| Beyond Pain Therapies Ltd | Health & social care | 2025 |
| Beyond the MAP Travel Ltd | Administrative & support | 2025 |
| Beyond the PEG Limited | Wholesale & retail | 2021 |
| Beyond Travel Ltd | Administrative & support | 2017 |
| BFF Club Ltd | Administrative & support | 2026 |
| Bfit Limited | Extraterritorial | 1997 |
| BH Commissioning Management Limited | Professional & scientific | 2026 |
| Bianca Bladt Ltd | Information & communication | 2026 |
| Bijnor Troth PVT Limited | Households | 2020 |
| Billet Road Management Company Limited | Households | 2000 |
| Birch Lodge Canewdon Limited | Real estate | 2018 |
| Birch Lodge Developments Ltd | Real estate | 2017 |
| Birchanger Dog Field Ltd | Arts & recreation | 2012 |
| Birchwood Mews Management Company Limited | Households | 2014 |
| Birkby Bridge Limited | Professional & scientific | 2024 |
| Bishop's Stortford BID Limited | Professional & scientific | 2018 |
| Bishop's Stortford College Enterprises Limited | Education | 2020 |
| Bishop's Stortford Community Podcast CIC | Information & communication | 2025 |