| BB Properties (NE) Ltd | Real estate | 2019 |
| BBD Hub Ltd | Administrative & support | 2018 |
| Bbde Orbital Holdings LLP | | 2017 |
| BBI Holdings Australia Limited | Financial services | 2014 |
| Bbpf LLP | | 2015 |
| Bbts Enterprises Limited | Administrative & support | 2003 |
| BBV Engineering Ltd | Professional & scientific | 2025 |
| BC Clean & Clear Specialists Ltd | Water & waste | 2026 |
| BC Developments N/E Ltd | Real estate | 2023 |
| BC Motor Engineering Ltd | Wholesale & retail | 2002 |
| BC Properties NE Ltd | Real estate | 2026 |
| Bcarroll Ltd | Real estate | 2020 |
| BCC HAS Ltd | Hospitality | 2015 |
| BCC Heaton Ltd | Hospitality | 2020 |
| Bceb LP | | 2017 |
| BCH Consultancy Ltd | Professional & scientific | 2025 |
| Bcomd Limited | Professional & scientific | 2017 |
| BCR Electrical Ltd | Construction | 2019 |
| BD Upholstery Ltd | Manufacturing | 2021 |
| BD2 Studios Ltd | Construction | 2025 |
| Bdaily Limited | Information & communication | 2007 |
| Bdmd Ltd | Real estate | 2025 |
| BE & R Properties LLP | | 2026 |
| BE Caring Communities Ltd | Public administration | 2024 |
| BE Caring Ltd | Health & social care | 2005 |
| BE Caring Together Ltd | Health & social care | 2014 |
| BE Caring Together Trustees Limited | Administrative & support | 2019 |
| BE Someone's Shining Star Ltd | Health & social care | 2021 |
| Be.Om Ltd | Professional & scientific | 2019 |
| Bea.Noble-Rogers Ltd | Professional & scientific | 2010 |
| Beach House Seahouses Limited | Hospitality | 2021 |
| Beacon Farm Developments Limited | Real estate | 2022 |
| Beacon Films CIC | Arts & recreation | 2011 |
| Beacon Hardware Limited | Wholesale & retail | 2003 |
| Beacon Labs Ltd | Information & communication | 2025 |
| Beaconhouse Events Ltd | Administrative & support | 2014 |
| Beadnell Management Northumberland Limited | Administrative & support | 2017 |
| Beadnell Point Management Limited | Administrative & support | 2016 |
| Beadnell Shore Properties Ltd | Financial services | 2024 |
| Beale Properties Ltd | Real estate | 2022 |
| Beam Estates Limited | Other services | 1998 |
| Beam Story LAB CIC | Information & communication | 2022 |
| Beamish Park Hotel Limited | Hospitality | 2004 |
| Beamish Property Group Limited | Construction | 2019 |
| Beany Properties Limited | Construction | 2019 |
| Bear Media Limited | Information & communication | 2008 |
| Bear Natural Kitchen Garden Ltd | Hospitality | 2018 |
| Beatdown Records Limited | Wholesale & retail | 2006 |
| Beatnik Studio Ltd | Information & communication | 2016 |
| Beattie Wealth Management Ltd | Professional & scientific | 2021 |
| Beaudica International Ltd | Wholesale & retail | 2025 |
| Beauforte Park Management Company Limited | Real estate | 1986 |
| Beaumont Bookkeeping Services Ltd | Professional & scientific | 2021 |
| Beaumont Groundworks & Landscaping Services Ltd | Construction | 2022 |
| Beautcon Ltd | Other services | 2025 |
| Beauty 22 Ltd | Other services | 2019 |
| Beauty and Fragrance Ltd | Other services | 2024 |
| Beauty and the Best Ltd | Other services | 2020 |
| Beauty by Becca Ltd | Other services | 2020 |
| Beauty Custom Club Ltd | Other services | 2025 |
| Beauty Haus NE Ltd | Other services | 2025 |
| Beauty Revealed Ltd | Other services | 2016 |
| Beauty Salon House Limited | Other services | 2014 |
| Beavrs Trading Limited | Professional & scientific | 2015 |
| Because the Internet Ltd | Wholesale & retail | 2025 |
| Bedale Meadows Management Company Limited | Real estate | 2019 |
| Bede Court RTM Company Limited | Real estate | 2012 |
| Bede Gaming (Holdings) Limited | Information & communication | 2014 |
| Bede Globe LLP | | 2010 |
| Bede Investments Limited | Real estate | 2015 |
| Bedeburn Discount Store Ltd | Wholesale & retail | 2019 |
| Bedeburn Food Store Limited | Wholesale & retail | 2016 |
| Bedrock Learning Ltd | Education | 2014 |
| Beds With Ease Limited | Administrative & support | 2001 |
| Beebay Limited | Wholesale & retail | 2019 |
| Beech Close (Seaton Delaval) Limited | Households | 2023 |
| Beech Cottage (Gosforth) Limited | Health & social care | 2022 |
| Beech Hill Holdings Limited | Real estate | 2017 |
| Beecham Peacock North East Limited | Professional & scientific | 2016 |
| Beechcroft Property Developments Ltd | Real estate | 2026 |
| Beechmangold Limited | Professional & scientific | 2011 |
| Beecholm Court (Ashbrooke) Residents Management Company Limited | Real estate | 2001 |
| Beechwood Property Management Limited | Administrative & support | 2010 |
| Beecroft Ltd | Construction | 2019 |
| Beer Line Wizard (Newcastle) Ltd | Administrative & support | 2023 |
| Beeston and Daniel Ltd | Information & communication | 2015 |
| Being There Limited | Information & communication | 2003 |
| Beingsmith Ltd | Extraterritorial | 2015 |
| Beirut Fruit and VEG Ltd | Wholesale & retail | 2024 |
| BEL Engineering (UK) Limited | Manufacturing | 2012 |
| BEL Estates Limited | Real estate | 2013 |
| BEL Group Investments Limited | Financial services | 1937 |
| BEL Valves Limited | Manufacturing | 1920 |
| Bela Moreno Limited | Wholesale & retail | 2026 |
| Beldav Employment Ltd | Administrative & support | 2020 |
| Belflooring Limited | Construction | 2014 |
| Belford Golf Club Ltd | Arts & recreation | 2019 |
| Belgrave Ventilation Services Ltd | Manufacturing | 2024 |
| Belgravia Cleaning Services Limited | Administrative & support | 2018 |
| Belgravia Investment Group Limited | Real estate | 2019 |