| Aspiration Training and Development Ltd | Administrative & support | 2019 |
| Assuranty Nationwide Limited | Financial services | 2010 |
| Assuron Ltd | Information & communication | 2017 |
| Atelier Vintage Limited | Wholesale & retail | 2023 |
| ATK Assets Limited | Arts & recreation | 2024 |
| ATS Finance Ltd | Financial services | 2025 |
| Attic Room Retail Limited | Professional & scientific | 2008 |
| Augustus Attire Ltd | Wholesale & retail | 2024 |
| Aura Clinic Limited | Extraterritorial | 2011 |
| Aura Salon Limited | Other services | 2011 |
| Austin Enterprises Ltd | Agriculture & fishing | 2021 |
| Authentimark Ltd | Information & communication | 2025 |
| Automated Material Handling Systems Association Limited | Other services | 1990 |
| Automotive Product Services Limited | Wholesale & retail | 2000 |
| Autumn House Properties Limited | Real estate | 2017 |
| AV and Data Solutions Limited | Information & communication | 2013 |
| Avanti Install Limited | Wholesale & retail | 2021 |
| Avatar Cafe Limited | Hospitality | 2024 |
| Avatar Dining Limited | Hospitality | 2015 |
| Avernish Investment Limited | Financial services | 2022 |
| Avonnex Limited | Wholesale & retail | 2020 |
| Avothek Limited | Professional & scientific | 2024 |
| AW Process Ltd | Professional & scientific | 2024 |
| Axi-Dent PDR Systems Limited | Wholesale & retail | 2022 |
| Axiom Regulatory Limited | Professional & scientific | 2026 |
| B & G Properties (Nottingham) Limited | Households | 2015 |
| B&N Lettings Ltd | Real estate | 2018 |
| B&S Inthawong 899 Limited | Hospitality | 2010 |
| B19TWY Holdings Ltd | Manufacturing | 2023 |
| Baby Blooz Indian Limited | Hospitality | 2019 |
| Babygigs C.I.C. | Arts & recreation | 2019 |
| Baddeley Wallace Plumbing & Heating Ltd | Construction | 2014 |
| Bagel & Griff Limited | Wholesale & retail | 2004 |
| Bakenology Limited | Manufacturing | 2014 |
| Bakereation Ltd | Manufacturing | 2020 |
| Bakerpubs Ltd | Hospitality | 2024 |
| Bakers Autos Solutions Ltd | Professional & scientific | 2025 |
| Bamboo Auctions Ltd | Professional & scientific | 2014 |
| Banegan Limited | Real estate | 2023 |
| Bani Property Investment Limited | Real estate | 2024 |
| Banks Amenity Products Limited | Manufacturing | 1961 |
| Banks Holdings Limited | Real estate | 2017 |
| Banks Property Holdings Limited | Real estate | 2017 |
| Banks Property Management Limited | Real estate | 2004 |
| Bar 29 Limited | Hospitality | 2024 |
| Bar Graph Ltd | Real estate | 2025 |
| Barcelo Asset Holdings Limited | Financial services | 2018 |
| Barham Stone Limited | Manufacturing | 2002 |
| Barkers Transport Ltd | Transport & logistics | 2025 |
| Barnsdale Gardens Limited | Wholesale & retail | 2013 |
| Barry Munson Consultancy Ltd | Administrative & support | 2025 |
| Basil-The Apiarist Ltd | Agriculture & fishing | 2018 |
| Baxtergate Ltd | Hospitality | 2016 |
| Baycroft Associates Limited | Professional & scientific | 2010 |
| BBB Investments Limited | Wholesale & retail | 2003 |
| BBO Holdings Ltd | Information & communication | 2025 |
| BCM Media Limited | Information & communication | 2024 |
| BDE Carpentry and Joinery Services Ltd | Construction | 2012 |
| Beacon Care and Advice Community Interest Company | Health & social care | 2017 |
| Beacon Properties 2016 Ltd | Other services | 2016 |
| Beams MH Ltd | Hospitality | 2024 |
| Bear Code Solutions Ltd | Information & communication | 2022 |
| Beast Street Limited | Real estate | 2013 |
| Beauchamp Walk Management Limited | Households | 2013 |
| Beautology Ltd | Wholesale & retail | 2003 |
| Beauty by GEM Ltd | Other services | 2023 |
| Beauty Collection Ltd | Wholesale & retail | 2009 |
| Beauty Naturals Ltd | Wholesale & retail | 2000 |
| Beauty Spot of Market Harborough Limited | Other services | 2011 |
| Beauwood Limited | Manufacturing | 2014 |
| Beckgate Professional Services Limited | Information & communication | 2017 |
| Bedford Mint Limited | Wholesale & retail | 2021 |
| Beer House Micro Pubs Limited | Hospitality | 2014 |
| Beetroot HR Limited | Administrative & support | 2014 |
| Begley Electrical Ltd | Construction | 2012 |
| Behave Yourselves Limited | Professional & scientific | 2024 |
| Being the Boss | Health & social care | 2009 |
| Belgarion Limited | Wholesale & retail | 2015 |
| Bellevalley Ltd | Wholesale & retail | 2018 |
| Belting & Conveying Solutions Limited | Professional & scientific | 2004 |
| Beltology UK Limited | Extraterritorial | 2014 |
| Belvedere ENG Ltd | Construction | 2015 |
| Belvoir (HF) Limited | Households | 2015 |
| Belvoir Affordable Homes Limited | Construction | 2016 |
| Belvoir Business Park Management Company Ltd | Construction | 2021 |
| Belvoir Butcher and Farm Shop Limited | Wholesale & retail | 2021 |
| Belvoir Castle Foundation | Education | 2016 |
| Belvoir Castle Opening LLP | | 2018 |
| Belvoir Energy Limited | Professional & scientific | 2017 |
| Belvoir Engine Yard Village Limited | Construction | 2016 |
| Bengal Foods Limited | Wholesale & retail | 1996 |
| Bensh Ltd | Construction | 2013 |
| Berry 51 Limited | Extraterritorial | 2014 |
| Berry Accountants Ltd | Professional & scientific | 2009 |
| Berry Bespoke Design & Build Limited | Construction | 2021 |
| Berry Bespoke Group Ltd | Administrative & support | 2025 |
| Berry Bespoke Property Ltd | Real estate | 2025 |
| Berry Trustees Limited | Extraterritorial | 2017 |
| Berry Wealth Management Ltd | Professional & scientific | 2015 |
| Bespoak Living Ltd | Manufacturing | 2020 |