| Ayla Care Limited | Information & communication | 2024 |
| Aylesford School Warwick | Education | 2011 |
| Aylora Health Limited | Financial services | 2026 |
| Aylsham Road Management Company Limited | Real estate | 2004 |
| Ayurvital Ltd | Wholesale & retail | 2020 |
| Azora Projects Ltd | Professional & scientific | 2023 |
| Aztec Solar Energy Limited | Professional & scientific | 2011 |
| B and a Property Management Ltd | Real estate | 2020 |
| B Bernamont Consultancy Ltd | Information & communication | 2019 |
| B-Line Audio Ltd | Information & communication | 2026 |
| B1 Associates Limited | Information & communication | 2013 |
| B2B.STORE Ltd | Information & communication | 2000 |
| B2C Consultancy Limited | Professional & scientific | 2007 |
| B61 Solutions Limited | Information & communication | 2024 |
| Baba Alli Ltd | Wholesale & retail | 2026 |
| Baby Hudson Limited | Manufacturing | 2019 |
| Babybjorn UK Limited | Wholesale & retail | 2023 |
| Babylon Enterprises Limited | Financial services | 2011 |
| Backbone Property Group Limited | Financial services | 2020 |
| BAG Direct Ltd | Wholesale & retail | 2023 |
| Baggycanvasmedia Ltd | Information & communication | 2024 |
| Bagri Homes Limited | Real estate | 2020 |
| Baileys of Warwick Limited | Wholesale & retail | 2020 |
| Balco Balcony Systems Limited | Construction | 2004 |
| Balloon Monkey Ltd | Wholesale & retail | 2022 |
| Balmoral Holdings UK Ltd | Financial services | 2023 |
| Baltoro Limited | Professional & scientific | 2024 |
| Banana Moon Day Nursery Limited | Administrative & support | 2009 |
| Banana Moon Franchise Limited | Education | 2018 |
| Banana Moon Group Limited | Financial services | 2026 |
| Banana Moon Holdings Limited | Professional & scientific | 2019 |
| Banana Moon Nursery Ltd | Education | 2012 |
| Banana Moon Properties Limited | Real estate | 2019 |
| Banbury Developments Limited | Construction | 2011 |
| Banbury Digital Finance Ltd | Administrative & support | 2019 |
| Banbury Digital Limited | Administrative & support | 2003 |
| Bang the Drum Productions Limited | Information & communication | 2016 |
| Banmoo Limited | Administrative & support | 2024 |
| Barbara Lock Limited | Professional & scientific | 2012 |
| Barbuss (UK) Limited | Financial services | 2020 |
| Barclay Pharmaceuticals Limited | Wholesale & retail | 1992 |
| Barcode and Rfid Specialist Consultancy Ltd | Information & communication | 2023 |
| Barcode Site Limited | Wholesale & retail | 2026 |
| Bards Maintenance and Service Ltd | Real estate | 2026 |
| Bare Direct Ltd | Other services | 2021 |
| Barford Burrows Estate Management Company Limited | Households | 2007 |
| Barford Burrows Residential Management Company NO. 1 Limited | Households | 2007 |
| Barford Burrows Residential Management Company NO. 2 Limited | Households | 2007 |
| Barford Business Services Ltd | Professional & scientific | 2022 |
| Barford Village Shop Community Interest Company | Wholesale & retail | 2006 |
| Bariatric Solutions UK Limited | Public administration | 2023 |
| Barnley Services Limited | Professional & scientific | 2021 |
| Barrowfield House, Kenilworth (Residents Management Co) Limited | Real estate | 2009 |
| Barski Tech Ltd | Professional & scientific | 2026 |
| Barton Day Ltd | Education | 2025 |
| Bartsharp Limited | Wholesale & retail | 2014 |
| Base by Design Ltd | Construction | 2020 |
| Basi ABC Limited | Real estate | 2019 |
| Basicview Limited | Real estate | 1987 |
| Bass Direct Limited | Wholesale & retail | 2008 |
| Basson Holdings Ltd | Hospitality | 2020 |
| Batchflow Engineering Limited | Manufacturing | 2001 |
| Batchflow Holdings Limited | Professional & scientific | 1986 |
| Bateman Asset Management Limited | Financial services | 2004 |
| Bateman Group Holdings Limited | Professional & scientific | 2004 |
| Batsford Management Ltd | Households | 2025 |
| Battle Hardened Outfitters Ltd | Wholesale & retail | 2025 |
| Baxi Group and Newmond Pension Trustees Limited | Administrative & support | 1996 |
| Baxi Group Limited | Professional & scientific | 2000 |
| Baxi Heating UK Limited | Manufacturing | 1999 |
| Baxi Holdings Limited | Professional & scientific | 2003 |
| Baxi Overseas Holdings Limited | Professional & scientific | 1999 |
| Baxiani Limited | Professional & scientific | 1920 |
| Baxter & Baxter Associates Limited | Professional & scientific | 2003 |
| BBE Podcast Agency Ltd | Manufacturing | 2023 |
| Bbky Limited | Wholesale & retail | 2025 |
| BBM Luxury Limited | Wholesale & retail | 2025 |
| BC Platforms UK Ltd | Information & communication | 2014 |
| BDR Thermea UK & Ireland Limited | Extraterritorial | 2021 |
| Beacon Models Ltd | Manufacturing | 2020 |
| Bear Consult Ltd | Information & communication | 2018 |
| Bear Jobs Recruitment Ltd | Administrative & support | 2017 |
| Bear Properties Ltd | Real estate | 2024 |
| Beardymanagement Limited | Information & communication | 2007 |
| Beauchamp Investments (2020) Limited | Administrative & support | 2020 |
| Beaufort Wealth Management Limited | Financial services | 2007 |
| Beausale Club Limited | Hospitality | 2023 |
| Beausale Consulting Limited | Information & communication | 2025 |
| Beauty Bionics Ltd | Other services | 2026 |
| Beauty Life - Ingiltere Ltd | Wholesale & retail | 2018 |
| Beddoe Care Limited | Health & social care | 2025 |
| Beduin Ltd | Real estate | 2016 |
| BEE and EM Limited | Other services | 2017 |
| BEE Consulting Group Limited | Other services | 2020 |
| Beem Tech Limited | Information & communication | 2025 |
| Beemont Limited | Agriculture & fishing | 2026 |
| Beep Properties Ltd | Real estate | 2025 |
| Beereal Holdings Limited | Information & communication | 2021 |
| Beforeudig Limited | Professional & scientific | 2008 |
| Bekas Design Ltd | Administrative & support | 2011 |