| ASH Lawn Sales Limited | Professional & scientific | 2024 |
| Ashby House Limited | Professional & scientific | 2011 |
| Ashby Music School Ltd. | Administrative & support | 2014 |
| Ashby Rise Ltd | Real estate | 2024 |
| Ashby Steel Fabrications Limited | Administrative & support | 2016 |
| Ashen Green Limited | Professional & scientific | 2013 |
| Ashen Properties Limited | Real estate | 2016 |
| Aspireviastudios Ltd | Real estate | 2020 |
| Asrt Medical Limited | Health & social care | 2024 |
| Asset Assured Management Limited | Administrative & support | 2019 |
| Assets Online Limited | Administrative & support | 1997 |
| Assist Business Consulting Ltd | Professional & scientific | 2018 |
| Assist Consultancy Ltd | Administrative & support | 2019 |
| Assisted. Ltd | Information & communication | 2016 |
| Assistium Limited | Health & social care | 2018 |
| Assistium Recruitment Ltd | Health & social care | 2023 |
| Associated Electrical Distributors Limited | Wholesale & retail | 1975 |
| Astari Group Limited | Wholesale & retail | 2020 |
| Astill Holdings Limited | Real estate | 2020 |
| AT Special Projects Ltd | Water & waste | 2020 |
| Atkinson Building Solutions Ltd | Construction | 2017 |
| Atkinson Property Services Ltd | Households | 2025 |
| Attune Partners UK Ltd | Professional & scientific | 2021 |
| Ault Medical Ltd | Health & social care | 2019 |
| Aurora Consulting Limited | Information & communication | 2001 |
| Authlogics Ltd | Information & communication | 2015 |
| Auto Freak Ltd | Administrative & support | 2021 |
| Automate Innovate Ltd | Information & communication | 2024 |
| Autostrada Works Limited | Wholesale & retail | 2025 |
| Avantor Holdings Limited | Financial services | 2020 |
| Avatar Lutterworth Limited | Hospitality | 2022 |
| Avensis Holdings Limited | Administrative & support | 2021 |
| Averae Construction Ltd | Construction | 2025 |
| Averae Property Ltd | Real estate | 2018 |
| AVR Lighting Limited | Extraterritorial | 2010 |
| Avus Solutions Limited | Professional & scientific | 2004 |
| Award Media Services Ltd | Professional & scientific | 2018 |
| Awgar Stone Limited | Information & communication | 2002 |
| Axceler - 8 Hovercraft Experience Limited | Arts & recreation | 2006 |
| Axiom Design Resource Limited | Other services | 1995 |
| Ayorinde Limited | Other services | 2011 |
| B & C Engineering (Leicester) Limited | Manufacturing | 1986 |
| B & M Trading UK Limited | Wholesale & retail | 2005 |
| B B Coaching & Consulting Ltd | Professional & scientific | 2019 |
| B Bennett Construction and Developments Ltd | Construction | 2025 |
| B G Building Services Limited | Other services | 2012 |
| B V Paan Limited | Construction | 2019 |
| B3AR Ltd | Information & communication | 2023 |
| B4L Ltd | Real estate | 2020 |
| Bacp Enterprises Limited | Information & communication | 1972 |
| Badminton Ventures Ltd | Professional & scientific | 2022 |
| Bajwa Surgical Ltd | Health & social care | 2018 |
| Baker Farming Limited | Agriculture & fishing | 2019 |
| Bala & Yamini Limited | Other services | 2014 |
| Balderton Medical Consultants Ltd | Professional & scientific | 2017 |
| Ball & Co Farming Ltd | Agriculture & fishing | 2024 |
| Baltic Imports Ltd | Wholesale & retail | 2019 |
| Barbara Fielding Knitwear Limited | Manufacturing | 1979 |
| Barbarian Limited | Professional & scientific | 2017 |
| Barkby Rise Ltd | Real estate | 2024 |
| Barnes & Coleby LLP | | 2020 |
| Barnes Imaging Ltd | Other services | 2015 |
| Barrelli SKI Limited | Hospitality | 2001 |
| Barrett & SON Decorators Ltd | Construction | 2025 |
| Bartimp Limited | Wholesale & retail | 2024 |
| Bartram & Co (Lutterworth) Limited | Real estate | 2000 |
| Baselake Limited | | 1981 |
| Bawnmore Coaching & Consulting Limited | Professional & scientific | 2012 |
| Bay Tree Cakes Limited | Manufacturing | 2018 |
| Bazaar Emporium Ltd | Wholesale & retail | 2015 |
| Bazeley & Co. Limited | Wholesale & retail | 2017 |
| BBG Holdings Ltd | Real estate | 2024 |
| BBH Motors Ltd | Wholesale & retail | 2024 |
| Bcnu Group Ltd | Professional & scientific | 2016 |
| BD Medical Services Ltd | Health & social care | 2023 |
| Bean Hill Management Limited | Other services | 2010 |
| Beany Hill Ltd | Hospitality | 2018 |
| Beanz Consulting Limited | Professional & scientific | 2008 |
| Bearst Bakery 1 Limited | Wholesale & retail | 2026 |
| Bearst Bakery 2 Limited | Wholesale & retail | 2026 |
| Becky Williams Talent Limited | Administrative & support | 2017 |
| Becoming - Ubuntu Ltd | Education | 2020 |
| Beeby Oslo Ltd | Construction | 2024 |
| Beer 121 Limited | Professional & scientific | 2004 |
| Belle & Blue Limited | Wholesale & retail | 2024 |
| Belvoir Property Investments Limited | Real estate | 1954 |
| Bennett's Motorcycle and Scooter Ltd | Wholesale & retail | 2019 |
| Berkeley Burke Group Limited | Financial services | 2001 |
| Berkeley, Burke & Company Limited | Financial services | 1973 |
| Bert & Blossom Ltd | Other services | 2023 |
| Bespoke Benefit Solutions Limited | Financial services | 2021 |
| Bespoke Neurosurgery Limited | Health & social care | 2019 |
| Best Start Nurseries Limited | Education | 2011 |
| Better Industries Limited | Professional & scientific | 2005 |
| Betterness Limited | Extraterritorial | 2010 |
| Bhsy Limited | Professional & scientific | 2010 |
| Bhtradingbar Limited | Hospitality | 2020 |
| Bills Digital Limited | Information & communication | 2024 |
| Bilton Build and Design Limited | Construction | 2008 |
| BIN Trading Ltd | Wholesale & retail | 2025 |