| Axiom Puzzleworks Ltd | Information & communication | 2025 |
| Axis Accounting Limited | Professional & scientific | 2010 |
| Axis Consulting Engineers Ltd | Professional & scientific | 2024 |
| Axis Corporate Solutions Limited | Professional & scientific | 2002 |
| Axis Payroll & HR Limited | Professional & scientific | 2010 |
| Axton Living Ltd | Hospitality | 2026 |
| Ayaan Ventures Ltd | Wholesale & retail | 2025 |
| Aygusta Prime Ltd | Construction | 2025 |
| Azimuth Pharma Limited | Professional & scientific | 2012 |
| AZR Properties Limited | Real estate | 2026 |
| Azsio Limited | Other services | 2013 |
| Azura Business Solutions Limited | Extraterritorial | 2004 |
| Azura Design Studio Limited | Extraterritorial | 2004 |
| Azura Group Ltd | Information & communication | 1990 |
| B Spoke Cycles (Macclesfield) Ltd | Wholesale & retail | 2023 |
| B&B Trans Ltd | Transport & logistics | 2016 |
| B.E. Gibbons Contractors Limited | Construction | 1976 |
| B.M.C. Local Van Hire Limited | Administrative & support | 1999 |
| B.Melling Building Contractors and Shop Fitters Ltd | Construction | 2002 |
| B2 Urban Ltd | Real estate | 2017 |
| B3DFF Construction and Renovation Ltd | Construction | 2025 |
| Babv Service Ltd | Transport & logistics | 2015 |
| Baby Acorn Ltd | Information & communication | 2025 |
| Baby Nonna Group Ltd | Wholesale & retail | 2021 |
| Bach 95 Limited | Wholesale & retail | 2020 |
| Back & Body Works Chiropractic Ltd | Health & social care | 2006 |
| Back to British Ltd | Wholesale & retail | 2020 |
| Back TOR Farm Ltd | Hospitality | 2014 |
| Bacs Property Ltd | Real estate | 2025 |
| Bactubasix Ltd | Wholesale & retail | 2025 |
| Badger Contracting Ltd | Professional & scientific | 2025 |
| Badger House Maintenance Limited | Construction | 1975 |
| Baffle Acoustics Ltd | Manufacturing | 2024 |
| BAG of Worms Limited | Information & communication | 2024 |
| Bagshaw Consultancy Services Ltd | Information & communication | 2015 |
| Bailey Business Park Ltd. | Real estate | 1990 |
| Bailey Hayes Ltd | Professional & scientific | 2026 |
| Bailey HQ Ltd | Information & communication | 2011 |
| Bailey Propco Holdings Limited | Financial services | 2021 |
| Bailey Propco Limited | Real estate | 2021 |
| Bailey Properties Development Limited | Real estate | 2007 |
| Baileys Contracting Ltd | Extraterritorial | 2022 |
| Bailiffs Cafe Ltd | Hospitality | 2022 |
| Baines Brothers Limited | Professional & scientific | 2018 |
| Balance Life Planning Ltd | Other services | 2020 |
| Balance Pilates Ltd | Arts & recreation | 2022 |
| Baldock Associates LLP | | 2017 |
| Ballr Holdings Limited | Arts & recreation | 2025 |
| Balmoral Gardens Management Company Limited | Households | 2006 |
| Bambleweeny Ltd | Information & communication | 2021 |
| Bancroft Soft Furnishings Limited | Wholesale & retail | 2002 |
| Band Architects Limited | Professional & scientific | 2013 |
| Bandit Europe Ltd | Wholesale & retail | 2025 |
| Bano Bathroom Renovation Specialists Limited | Construction | 2025 |
| Bargain Butties Ltd | Hospitality | 2018 |
| Barking MAD Limited | Agriculture & fishing | 2001 |
| Barley Fold Artisan Ltd | Wholesale & retail | 2026 |
| Barlow's Farm Machinery Ltd. | Wholesale & retail | 2019 |
| Barlow's Farming Limited | Real estate | 2014 |
| Barn Road Trading Estate Management Company Limited | Real estate | 2013 |
| Barnes Conveyancing Ltd | Information & communication | 2024 |
| Barnett Saks Ltd | Real estate | 2024 |
| Barnsdale Close (31-38) Freehold Limited | Households | 2017 |
| Bars Barbers Limited | Other services | 2021 |
| Bartax Accountants Ltd | Professional & scientific | 2000 |
| Bartax Accountants WFC Limited | Professional & scientific | 2018 |
| Bartram Lifecycle Limited | Health & social care | 2023 |
| Base Pizzeria Ltd | Hospitality | 2020 |
| Baseline Digital Marketing Ltd | Professional & scientific | 2025 |
| Basestation Limited | Wholesale & retail | 1997 |
| Basicfare Limited | Manufacturing | 1994 |
| Baskd Limited | Wholesale & retail | 2025 |
| Bassface Distribution Ltd | Manufacturing | 2017 |
| Bate Hall Kitchen Ltd | Hospitality | 2026 |
| Bates Contractors Limited | Agriculture & fishing | 2011 |
| Battambang (North West) Ltd | Hospitality | 2025 |
| Battereasy Limited | Wholesale & retail | 2021 |
| Baustelle Limited | Wholesale & retail | 2025 |
| Bavarian Wheel Worx (2021) Ltd | Manufacturing | 2021 |
| BAX Properties Limited | Real estate | 2005 |
| Baydem Limited | Other services | 2022 |
| Bayon Architectural Technology Limited | Professional & scientific | 2008 |
| Bayreal Limited | Extraterritorial | 2025 |
| BB Heat Ltd | Construction | 2026 |
| BB Music Limited | Arts & recreation | 2015 |
| BB Renewable Energy Ltd | Agriculture & fishing | 2022 |
| BBM Fifty-Seven Limited | Professional & scientific | 2007 |
| BBQ Fest Ltd | Arts & recreation | 2024 |
| BBT 2023 Limited | Professional & scientific | 2023 |
| BC Education Ltd | Education | 2011 |
| BCB Holdings (Cheshire) Limited | Financial services | 2013 |
| Bdjh Limited | Financial services | 1982 |
| BE Art Holdings Ltd | Arts & recreation | 2023 |
| BE Creative Media Ltd | Professional & scientific | 2024 |
| BE in Tech Limited | Administrative & support | 2024 |
| Beach Bums Club Ltd | Wholesale & retail | 2022 |
| Beachcourt Trearddur Bay Limited | Households | 2004 |
| Beaden Electrical Limited | Construction | 2015 |
| Beaden Renewables Limited | Construction | 2025 |
| Beagem Limited | Financial services | 2020 |