| Autocraft Technology Solutions Limited | Financial services | 2022 |
| Automateai Global Ltd | Information & communication | 2025 |
| Automated Managed Services Ltd | Manufacturing | 2014 |
| Automatizar Ltd | Professional & scientific | 2021 |
| Autorenova Kowalczyk Ltd | Wholesale & retail | 2025 |
| Auxilium Solutions Ltd | Administrative & support | 2018 |
| Avanti Windows Limited | Construction | 1988 |
| Avgo Biotech Ltd | Manufacturing | 2014 |
| AVH Consulting & Procurement Limited | Professional & scientific | 2020 |
| AW Consulting (UK) Limited | Professional & scientific | 2014 |
| AWM Cladding Ltd | Construction | 2019 |
| Axia Computer Systems Limited | Wholesale & retail | 1994 |
| Aychenby Entertainments Ltd | Information & communication | 2021 |
| Azeti Ltd | Professional & scientific | 2025 |
| B Heywood LLP | | 2009 |
| B Vincent Motorcycles Limited | Wholesale & retail | 2024 |
| B-Line Health & Beauty Products Limited | Manufacturing | 1990 |
| B-Safe Health & Safety Services Limited | Professional & scientific | 2010 |
| B.Knitt Ltd | Wholesale & retail | 2020 |
| Baan Thai UK Limited | Hospitality | 2014 |
| Babakin Limited | Professional & scientific | 2015 |
| Bachlerracing Limited | Wholesale & retail | 2016 |
| Back Acre Enterprises Limited | Real estate | 1999 |
| BACK2BRIGHT Ltd | Wholesale & retail | 2024 |
| Bailgate Deli Limited | Hospitality | 2025 |
| Baines Estates Limited | Agriculture & fishing | 2015 |
| Bainton Estates Limited | Real estate | 2010 |
| Bake Endless Summer Ltd | Other services | 2023 |
| Baladeal Ltd | Wholesale & retail | 2021 |
| Baldock Transport Ltd | Transport & logistics | 2026 |
| Balfe Property Investments Limited | Real estate | 2014 |
| Balfe Specialist Engineering Ltd | Wholesale & retail | 2018 |
| Ballou UK Investments Limited | Financial services | 2023 |
| Ballylynch Capital Limited | Financial services | 2011 |
| Balmain Underwriting (Nameco NO.382) Limited | Financial services | 1999 |
| Bandung UK Capital Limited | Financial services | 2014 |
| Bar Property Limited | Real estate | 2024 |
| Barkston Car Wash Limited | Administrative & support | 2025 |
| Barkston Motor Sales Limited | Wholesale & retail | 2005 |
| Barkston Refinishing Limited | Wholesale & retail | 2003 |
| Barmstedt Property Company Limited | Construction | 2013 |
| Barnaby Sykes Limited | Administrative & support | 2012 |
| Barnes Property Investments Limited | Real estate | 2008 |
| Barnswell Property Limited | Households | 2014 |
| Barnswell Timber Limited | Wholesale & retail | 2010 |
| Barrowby Accountants Limited | Professional & scientific | 1999 |
| Bart Automotive Ltd | Wholesale & retail | 2020 |
| Bartlett Total Build Ltd | Construction | 2005 |
| Bartwones Development Ltd | Real estate | 2025 |
| Baseair Limited | Professional & scientific | 1999 |
| Bassingthorpe Limited | Arts & recreation | 2023 |
| Batey & Co Ltd | Real estate | 2021 |
| Baughn Electrical Services and Testing Limited | Professional & scientific | 2016 |
| BB Ecclesfield Limited | Hospitality | 2019 |
| BBQ Bros Ltd | Other services | 2025 |
| Bcbfreehold Ltd | Real estate | 2019 |
| BCG Studio Ltd | Wholesale & retail | 2026 |
| BCH Leisure Ltd | Hospitality | 2025 |
| BCH Stamford Ltd | Agriculture & fishing | 2023 |
| BDM GRP Composites Ltd | Manufacturing | 2020 |
| Bdmg Consulting Limited | Professional & scientific | 1995 |
| BEA Investments Ltd | Wholesale & retail | 2021 |
| Beach Kiosks Limited | Hospitality | 2014 |
| Beacon Gardens Management Company Limited | Households | 2016 |
| Beacon Heritage Clothing LAB Limited | Wholesale & retail | 2026 |
| Bead Accountancy Limited | Professional & scientific | 2024 |
| Bear and BEE Garage Ltd | Wholesale & retail | 2023 |
| Beaumanoir Ltd | Energy | 2024 |
| Beefurniture Limited | Wholesale & retail | 2018 |
| Beehive Furniture Wholesalers Limited | Wholesale & retail | 2023 |
| Bell & Co Construction Limited | Construction | 2016 |
| Bellara Limited | Information & communication | 2026 |
| Bellwork Developments Limited | Construction | 2002 |
| Belmont 1 Limited | Real estate | 2017 |
| Belsothag Ltd | Wholesale & retail | 2021 |
| Belton Books Ltd | Wholesale & retail | 2025 |
| Belton Gardens Management Limited | Real estate | 2006 |
| Belton Park Golf Club 1890 Limited | Arts & recreation | 2021 |
| Belton Park Golf Club Ltd | Arts & recreation | 2018 |
| Belton Property Grantham Ltd | Real estate | 1993 |
| Belton Stoves & Chimneys Limited | Construction | 2020 |
| Belvedere Feeds Limited | Extraterritorial | 2009 |
| Belvoir Education and Sports Trust | Education | 2009 |
| Belvoir Property Services Ltd | Construction | 2019 |
| Belvoir Windows Limited | Construction | 2008 |
| BEN Elevare Ltd | Manufacturing | 2025 |
| BEN Jinks Properties Ltd | Administrative & support | 2023 |
| Benco Creative Ltd | Arts & recreation | 2010 |
| Benksurg Healthcare Limited | Public administration | 2023 |
| Benmak Limited | Health & social care | 2014 |
| Berts Way Management Company Limited | Households | 2006 |
| Bespoke Automotive Manufacturing Ltd | Professional & scientific | 2017 |
| Bespoke Tours Oman Limited | Administrative & support | 2016 |
| Besties Boutique Limited | Wholesale & retail | 2025 |
| Better Wealth Ltd | Financial services | 2025 |
| Beumar Ltd | Wholesale & retail | 2023 |
| Beyond Money Education & Training CIC | Education | 2023 |
| Bhandari Brothers Ltd | Financial services | 2004 |
| Bibliopola Ltd | Wholesale & retail | 2018 |
| Bickford Limited | Real estate | 1997 |