| Attaviti Limited | Transport & logistics | 2015 |
| Attention Layer Consulting Ltd | Information & communication | 2011 |
| Attis IT Ltd | Professional & scientific | 2020 |
| Atul UK Limited | Wholesale & retail | 1996 |
| Audacc Commercial Property Management Ltd | Real estate | 2024 |
| Audacc Consultancy Limited | Financial services | 2017 |
| Audacc Immigration Services and Visa Consultancy Ltd | Professional & scientific | 2021 |
| Audacc Logistics&Customs Consultancy Ltd | Transport & logistics | 2021 |
| Audacc Property Management Ltd | Real estate | 2024 |
| Audacc Property Sale Management Ltd | Real estate | 2026 |
| Audiocover Ltd | Health & social care | 2021 |
| Auditor Locator Limited | Professional & scientific | 2010 |
| Aurelia Private Wealth Limited | Professional & scientific | 2022 |
| Auru Properties Limited | Real estate | 2024 |
| Austin Legacy Limited | Financial services | 2020 |
| Authentic Realms Ltd | Manufacturing | 2023 |
| Authentic Talent Limited | Administrative & support | 2019 |
| Auto Avenue Cheadle Ltd | Wholesale & retail | 2024 |
| AUTO2S UK Limited | Wholesale & retail | 2023 |
| AUTO3DESIGN Ltd | Wholesale & retail | 2023 |
| Automation Supply Limited | Construction | 2002 |
| Automotivecare Limited | Professional & scientific | 2010 |
| Autorepair Network Limited | Wholesale & retail | 2023 |
| Aval Clinic Ltd | Health & social care | 2023 |
| Avangart Sofa Limited | Wholesale & retail | 2025 |
| Avashrik TEK Ltd | Information & communication | 2025 |
| Avron Ltd | Extraterritorial | 2005 |
| AVÓ Ju’Ó Limited | Wholesale & retail | 2019 |
| AW Accountants Group Limited | Professional & scientific | 2024 |
| AW1 Investments Ltd | Real estate | 2023 |
| AWA Homes Ltd | Real estate | 2025 |
| AWA Properties Group Ltd | Real estate | 2025 |
| AWA Real Estate Ltd | Real estate | 2024 |
| Awan Logistics Ltd | Transport & logistics | 2025 |
| Awan Medics Limited | Health & social care | 2013 |
| AWE Interiors Limited | Construction | 2023 |
| Axcelerate Supply & Logistics Ltd | Professional & scientific | 2024 |
| Axcorn Holdings Ltd | Financial services | 2026 |
| Axeman Investments Ltd | Financial services | 2025 |
| Axiom HR Ltd. | Professional & scientific | 2006 |
| Axle Freight Solutions Limited | Transport & logistics | 2024 |
| AXT Accountants Limited | Professional & scientific | 2019 |
| AXT Professional Limited | Administrative & support | 2019 |
| Axton Financial Ltd | Financial services | 2018 |
| AXY Construction Ltd | Construction | 2019 |
| AYA Eyecare Ltd | Professional & scientific | 2023 |
| Ayasan Investments Ltd | Financial services | 2023 |
| Ayat Estates Limited | Real estate | 2025 |
| AYB Vino Limited | Wholesale & retail | 2024 |
| Aytobe Limited | Professional & scientific | 2010 |
| Ayton Properties Limited | Real estate | 2020 |
| Azeem Property Management Services Ltd | Real estate | 2020 |
| AZH Health Limited | Health & social care | 2024 |
| Azmasys Consulting Ltd | Professional & scientific | 2026 |
| Aztec Installation Ltd | Construction | 2023 |
| B & a Way Ltd | Wholesale & retail | 2019 |
| B & D Holroyd Pubs Limited | Professional & scientific | 2025 |
| B&D Clarke Limited | Wholesale & retail | 2005 |
| B&H Clinical Ltd | Health & social care | 2026 |
| B&L Wholesale Ltd | Transport & logistics | 2020 |
| B'Spoke Cleaning Services Ltd | Administrative & support | 2019 |
| B.K. Trade Sales Ltd | Wholesale & retail | 2002 |
| B.P.R. Management Limited | Households | 1986 |
| B34 Holdings Ltd | Construction | 2023 |
| BA Training Limited | Education | 2020 |
| Baaz Limited | Information & communication | 2023 |
| Baby Sensory High Peak Ltd | Education | 2026 |
| Babylon Property Limited | Real estate | 2025 |
| Back LAB Ltd | Health & social care | 2024 |
| Badger and Nash Limited | Real estate | 2020 |
| Bahadur & Co Ltd | Health & social care | 2013 |
| Bahar Properties Limited | Real estate | 2019 |
| Bailey Project Management Limited | Professional & scientific | 1997 |
| Bakery Bites Ltd | Hospitality | 2020 |
| Bakewell Estates Ltd | Real estate | 2026 |
| Baki Products Limited | Wholesale & retail | 2022 |
| Ballon Sports Limited | Professional & scientific | 2018 |
| Balloon Boutique Events Limited | Wholesale & retail | 2024 |
| Bamboo Solutions Ltd | Financial services | 2023 |
| Bancroft Property Limited | Real estate | 2002 |
| Bandiddo Barber Cheadle Limited | Other services | 2026 |
| Banisadr & Smart Holdings Ltd | Real estate | 2025 |
| Banisadr Consulting Ltd | Professional & scientific | 2025 |
| Banisadr Holdings Limited | Real estate | 2023 |
| Bansal Brands Ltd | Wholesale & retail | 2025 |
| Bar 747 Limited | Hospitality | 2019 |
| Barbourisjames Ltd | Administrative & support | 2022 |
| Barclay House Manchester Manco Limited | Real estate | 2026 |
| Bare Bliss Ltd | Wholesale & retail | 2025 |
| Barfield House Management Limited | Households | 1995 |
| Bargain Discount Store Limited | Wholesale & retail | 2026 |
| Bargains House Ltd | Wholesale & retail | 2021 |
| Bark Brick & Block Ltd | Manufacturing | 2018 |
| Barkley Ventures Limited | Real estate | 2016 |
| Barlow Accounts Services Limited | Administrative & support | 2010 |
| Barlow Nelli Property Developments Limited | Real estate | 2026 |
| Barn Games Ltd | Wholesale & retail | 2025 |
| Barrett Partners Ltd | Professional & scientific | 2023 |
| Barrie Roberts Financial Adviser Limited | Financial services | 2010 |
| Base Level Building Contractors Ltd | Construction | 2026 |