| Bishop's Stortford Football Club Limited | Arts & recreation | 1990 |
| Bishop's Stortford Golf Club 2004 Limited | Arts & recreation | 2004 |
| Bishop's Stortford Management Company Limited (the) | Households | 1971 |
| Bishop's Stortford Meeting Rooms Ltd | Administrative & support | 2018 |
| Bishop's Stortford Park Management Company Limited | Construction | 2025 |
| Bishop's Stortford Rugby Football Club (2015) | Arts & recreation | 2015 |
| Bishop's Stortford Tyres Limited | Wholesale & retail | 2025 |
| Bishops Construction (Southern) Limited | Construction | 2015 |
| Bishops Construction Services Limited | Construction | 2009 |
| Bishops Food Centre Ltd | Wholesale & retail | 2018 |
| Bishops Stortford Community Football Club | Arts & recreation | 2016 |
| Bishops Stortford Futsal Ltd | Arts & recreation | 2025 |
| Bishops Stortford Veterinary Hospital Limited | Professional & scientific | 2012 |
| BJC Building Ltd | Construction | 2019 |
| BJP Plumbing & Heating Ltd | Construction | 2026 |
| BJW Business Consulting Ltd | Professional & scientific | 2015 |
| BKF Property Ltd | Construction | 2025 |
| BKX Services Ltd | Construction | 2026 |
| Black Creators Matter Ltd | Professional & scientific | 2019 |
| Black Cross Investments Ltd | Real estate | 2025 |
| Black Magic Hospitality Ltd | Hospitality | 2017 |
| Black Piano Holdings Limited | Other services | 2020 |
| Black Piano Limited | Professional & scientific | 2019 |
| Blackham & Co Property Projects Ltd | Construction | 2013 |
| Blackhurst Wade Limited | Wholesale & retail | 2023 |
| Blackridge Services Ltd | Construction | 2023 |
| Blackstone Software Solutions Ltd | Information & communication | 2016 |
| Blackthorn Sporting Heritage Ltd | Wholesale & retail | 2026 |
| Bladi Limited | Wholesale & retail | 2023 |
| Blake Redrup Consulting Limited | Financial services | 2024 |
| Blasm Limited | Real estate | 2018 |
| Bliss Plants UK Limited | Agriculture & fishing | 2025 |
| Block Limited | Other services | 1995 |
| Blomfield House Bury ST Edmunds Limited | Households | 2020 |
| Bloomora Lifestyle Ltd | Wholesale & retail | 2026 |
| Blossom Barn Nursery at Hatfield Broad Oak Limited | Health & social care | 2024 |
| Blue Cove Enterprises Limited | Real estate | 2018 |
| Blue Hive Services Limited | Health & social care | 2022 |
| Blue Marble Sustainability Ltd | Other services | 2018 |
| Blue Otter Marketing Ltd | Information & communication | 2016 |
| Blue Rock Mining Services Ltd | Mining & quarrying | 2011 |
| Blue Saxaphone Limited | Wholesale & retail | 2024 |
| Blue Skies Education Ltd | Administrative & support | 2024 |
| Blue Sky Itsm Limited | Information & communication | 2015 |
| Blue Square Developments Limited | Real estate | 2008 |
| Blue Star Strategy Consulting Limited | Professional & scientific | 2015 |
| Blue Star Strategy Ltd | Professional & scientific | 2016 |
| Blue Stork Limited | Real estate | 2017 |
| Bluebell Forest School Limited | Education | 2017 |
| Bluebird Works Limited | Information & communication | 2015 |
| Bluestone Computer Consultancy Limited | Information & communication | 2014 |
| Bmsd Ltd | Manufacturing | 2015 |
| Board & Brush Ltd | Construction | 2024 |
| Boca Marketing Ltd | Other services | 2024 |
| Boddingtons Power Controls Limited | Professional & scientific | 2009 |
| Bodza UK Ltd | Information & communication | 2014 |
| Bohemian Brands Limited | Wholesale & retail | 2016 |
| Bokata Limited | Wholesale & retail | 2021 |
| Bollington Hall Limited | Agriculture & fishing | 2003 |
| Bollington VHM Limited | Agriculture & fishing | 2023 |
| BON Vivant AC Limited | Arts & recreation | 2023 |
| Boniface Enterprises Limited | Education | 2020 |
| Bonner Bars and Restaurants Ltd | Hospitality | 2018 |
| BOO Health Limited | Health & social care | 2019 |
| BOO Logistics Ltd | Transport & logistics | 2018 |
| Boon & WEALTH88 Ltd | Hospitality | 2026 |
| Borsch Limited | Hospitality | 2022 |
| Bossal Limited | Professional & scientific | 2017 |
| Bostin Burger Ltd | Hospitality | 2025 |
| Boulter Heating Limited | Construction | 2003 |
| Bounce Station Ltd | Arts & recreation | 2018 |
| Bouncing Brilliant Limited | Financial services | 2006 |
| Boundary Close Residents Group Limited | Households | 2021 |
| Box Tech Ltd | Information & communication | 2019 |
| BOZ Empire Ltd | Wholesale & retail | 2024 |
| Boztas Properties Limited | Real estate | 2019 |
| BP Fire Ltd | Construction | 2022 |
| Brackenfall Holdings Ltd | Financial services | 2025 |
| Bradford Funeral Services Ltd. | Other services | 2007 |
| Bradley Investments & Ventures Limited | Real estate | 2025 |
| Brady Contract Services Limited | Construction | 2012 |
| Brainrace Ltd | Education | 2019 |
| Braithwaite Solutions Ltd | Extraterritorial | 2006 |
| Bravex Group Ltd | Wholesale & retail | 2025 |
| Braziers Quay Management Limited | Households | 1988 |
| Breen & Associates Limited | Administrative & support | 2026 |
| Breen Launderette Limited | Other services | 2025 |
| Breezy Investments Limited | Financial services | 2025 |
| Breive Ltd | Hospitality | 2025 |
| Brennan Fitness Ltd | Other services | 2026 |
| Bretland Capital Limited | Financial services | 2025 |
| BRF Consultancy Ltd | Financial services | 2024 |
| Brian Collins Consultancy Limited | Administrative & support | 2024 |
| Brick Kiln Barn Limited | Hospitality | 2023 |
| Bridge Cloud Solutions Limited | Information & communication | 2006 |
| Bridgeford House Limited | Households | 1967 |
| Bright Box Electrical Limited | Professional & scientific | 2019 |
| Bright Head Marketing Ltd | Professional & scientific | 2025 |
| Bright Light Performance Ltd | Professional & scientific | 2019 |
| Bright Red Thread Limited | Professional & scientific | 2022 |