| Auden Distribution Limited | Wholesale & retail | 2013 |
| Augusta Contractors Ltd | Construction | 2026 |
| Austin Estates Ltd | Real estate | 2025 |
| Auto Spray (Darwen) Ltd | Wholesale & retail | 2023 |
| Autogenik Ltd | Wholesale & retail | 2023 |
| Autotrack Telematics Ltd | Wholesale & retail | 2025 |
| Avanti Global Trading Limited | Manufacturing | 2024 |
| Averon Accounting Limited | Professional & scientific | 2026 |
| Aves Optometrists Limited | Wholesale & retail | 2009 |
| AVL Stays Ltd | Real estate | 2026 |
| AVO Homes Ltd | Real estate | 2024 |
| Awh.Com Limited | Professional & scientific | 2003 |
| Awin D Ltd | Other services | 2023 |
| Axiel Group Limited | Real estate | 2023 |
| Axis Electrical Solutions Ltd | Construction | 2024 |
| Azera Trader Ltd | Wholesale & retail | 2025 |
| AZG Communications Limited | Information & communication | 2020 |
| Aztec Office Contracts Ltd | Manufacturing | 2002 |
| B Global Metering Limited | Information & communication | 2003 |
| Bahar 68 Ltd | Hospitality | 2024 |
| Bailey Education Limited | Education | 2007 |
| Bajrangi Ltd | Wholesale & retail | 2012 |
| Bakers Broker Limited | Extraterritorial | 2023 |
| Balf Productions Limited | Wholesale & retail | 2008 |
| Balmoral Gardens (Darwen) Management Company Limited | Professional & scientific | 2022 |
| Bammys Limited | Hospitality | 2018 |
| Band Surveying Ltd | Professional & scientific | 2025 |
| Bankstaff Recruitment Ltd | Administrative & support | 2017 |
| Bark by Mylo Limited | Wholesale & retail | 2024 |
| Barks Allowed Ltd | Other services | 2023 |
| Barks Naturals Ltd | Wholesale & retail | 2024 |
| Barlow Property Group Ltd | Real estate | 2018 |
| Barnard & Levit Limited | Wholesale & retail | 2001 |
| Barnard Associates (Hove) Limited | Wholesale & retail | 2004 |
| Barnett Optical Limited | Wholesale & retail | 2021 |
| Barr Dynasty Ltd | Professional & scientific | 2018 |
| Barraclough and Stiles Limited | Wholesale & retail | 2005 |
| Barrs Holdings Ltd | Financial services | 2025 |
| Barwood Interiors Limited | Construction | 2002 |
| Bastette Limited | Information & communication | 2018 |
| Bastion Fire & Security Ltd | Administrative & support | 2026 |
| Baxter Allen Developments Ltd | Construction | 2022 |
| Baxter Estate Agents Limited | Real estate | 2014 |
| Baxter Investments Ltd | Real estate | 2023 |
| BB Optical Ltd | Health & social care | 2013 |
| BBR Optometry Ltd | Other services | 2003 |
| BBT Clothing Limited | Wholesale & retail | 2013 |
| BCS 2026 Limited | Financial services | 2026 |
| Beard Engineering Solutions Ltd | Manufacturing | 2019 |
| Beardmore Farrier Services Limited | Agriculture & fishing | 2003 |
| Beau Property Development Ltd | Real estate | 2025 |
| Bedlow Consultants Ltd | Professional & scientific | 2025 |
| BEE Computers Limited | Wholesale & retail | 2025 |
| Beebrands Ltd | Wholesale & retail | 2016 |
| Beech's Gardens and Grounds Maintenance Ltd | Administrative & support | 2020 |
| Beer I'Th Hand Limited | Wholesale & retail | 2018 |
| BEK3 Holdings Ltd | Financial services | 2025 |
| Bell Brothers (Opticians) Limited | Wholesale & retail | 1977 |
| Bell Brothers Holdings Ltd | Wholesale & retail | 2019 |
| Bellrex Premiere Ltd | Wholesale & retail | 2024 |
| Bellusci Windows Ltd | Construction | 2026 |
| Belmont Handling Limited | Real estate | 1984 |
| BEN H Tattoos Ltd | Arts & recreation | 2026 |
| BEN Lloyd Online Coaching Limited | Arts & recreation | 2023 |
| BEN Mirkin Limited | Wholesale & retail | 1976 |
| Ben's Wildlife Ltd | Wholesale & retail | 2023 |
| Bengal Spice Darwan Limited | Hospitality | 2026 |
| Bennett Cards Limited | Wholesale & retail | 2004 |
| Bennett's Blinds Limited | Wholesale & retail | 2021 |
| Bentley Consultancy (Blackburn) Limited | Professional & scientific | 2001 |
| Berry (UK) Contracts Ltd | Construction | 2018 |
| Bespoke CAD Ltd | Professional & scientific | 2022 |
| Bespoke Complete Services Limited | Manufacturing | 1998 |
| Best Style Paving Limited | Administrative & support | 2014 |
| Bestway Healthcare Services Limited | Health & social care | 2023 |
| Bfwh Ltd | Wholesale & retail | 2024 |
| BH Express Logistics Ltd | Transport & logistics | 2026 |
| BHS Furnishing Ltd | Wholesale & retail | 2026 |
| Biddle Optical Ltd | Health & social care | 2015 |
| Bill Optical Limited | Wholesale & retail | 2010 |
| Billoyd Autos Limited | Extraterritorial | 2002 |
| Billy Properties Ltd | Real estate | 2007 |
| Bird and Fairley (Dunmow) Limited | Health & social care | 2006 |
| Bird and Fairley (Loughton) Limited | Health & social care | 2006 |
| Bitz Creative Studios Limited | Information & communication | 2025 |
| Biuro Twoich Spraw Ltd | Professional & scientific | 2017 |
| Bjornbreaks Ltd | Wholesale & retail | 2026 |
| Black BUG Ltd | Information & communication | 2025 |
| Black Cat Housing Ltd | Real estate | 2019 |
| Black Sail PUB Co Limited | Hospitality | 2024 |
| Blackburn Martial Arts & Kickboxing Club Ltd | Arts & recreation | 2010 |
| Blackburn MOT Centre Ltd | Wholesale & retail | 2017 |
| Blackburn MOT Ltd | Wholesale & retail | 2026 |
| Blackburn Pallets Limited | Manufacturing | 1992 |
| Blackburn Tyres & MOT Centre Ltd | Wholesale & retail | 2026 |
| Blake Bathroom Installation Ltd | Construction | 2026 |
| Blendworth Interiors Limited | Manufacturing | 2022 |
| BLI Ltd | Health & social care | 2011 |
| Bliinx Eyecare Limited | Health & social care | 2014 |
| Blonde & Strong Ltd | Professional & scientific | 2020 |