| ALL Occasion Sweet Shop Ltd | Wholesale & retail | 2020 |
| Allanson Business Consultancy Limited | Professional & scientific | 2016 |
| Allbody UK Ltd | Wholesale & retail | 2018 |
| Alleys Green Management Company Limited | Administrative & support | 1992 |
| Alliance Prestige Limited | Wholesale & retail | 1998 |
| Allotment Gate Flowers Ltd | Wholesale & retail | 2025 |
| Allowgreen Limited | Real estate | 1998 |
| Allucy Limited | Administrative & support | 2024 |
| Alph Properties Ltd | Construction | 2025 |
| Alpha Barbers Ltd | Other services | 2020 |
| Alpha Developments (UK) Holdings Limited | Financial services | 2024 |
| ALW Projects Ltd | Construction | 2025 |
| AM Tracking Ltd | Administrative & support | 2026 |
| Amazing Spaces (NW) Ltd | Construction | 2021 |
| AMC Finch Holdings Limited | Construction | 2026 |
| Amelia's Bridal Boutique Ltd | Wholesale & retail | 2011 |
| Amelias 2 Ltd | Wholesale & retail | 2020 |
| Amico MIO Whalley Ltd | Hospitality | 2021 |
| AMS Sloan Holdings Ltd | Financial services | 2020 |
| Andrew Read Bespoke Woodwork Limited | Construction | 2018 |
| Andrew Riley Joinery Limited | Construction | 2016 |
| Angela Holden-Smith (Health, Fitness, and Nutrition) Limited | Other services | 2015 |
| Animalhaus Media Ltd | Professional & scientific | 2018 |
| Ankh Key AMI Ltd | Administrative & support | 2024 |
| Ankh Key Ltd | Administrative & support | 2021 |
| Annabel Spenceley Ltd | Arts & recreation | 2010 |
| Anrichp Ltd | Professional & scientific | 2021 |
| ANT MAN Limited | Transport & logistics | 2025 |
| Anthony J Montague Ltd | Health & social care | 2026 |
| Anthony Richardson Ltd | Health & social care | 2020 |
| Anywhere Care Limited | Information & communication | 2017 |
| Anywhere Group Limited | Financial services | 2018 |
| Anywhere SIM Limited | Information & communication | 2015 |
| AP Digital Ltd | Professional & scientific | 2021 |
| Appetite Project Management Ltd | Professional & scientific | 2008 |
| Appliance Holdings Limited | Financial services | 2015 |
| Applied Psychology Services Holdings Ltd | Financial services | 2024 |
| Apricot Meringue Ltd | Hospitality | 2002 |
| AQ Passion & Good Food Limited | Hospitality | 2022 |
| Archers Property Investments Ltd | Real estate | 2006 |
| Archway Payroll Services Limited | Administrative & support | 2014 |
| Archytas Commercial Finance Ltd | Financial services | 2017 |
| Arding West Secure Medical Ltd | Health & social care | 2020 |
| Ardour Flooring Ltd | Construction | 2024 |
| Arlb Properties Ltd | Real estate | 2018 |
| Arlo Residential Limited | Real estate | 2018 |
| Armadry Limited | Information & communication | 2007 |
| Armerhold Limited | Administrative & support | 2015 |
| Armourfactory Limited | Wholesale & retail | 2018 |
| Armstrong Parkinson Limited | Transport & logistics | 2023 |
| Arrow Management Consulting Limited | Administrative & support | 2008 |
| Art of the Loom Ltd | Manufacturing | 2010 |
| Artisan Escapes Limited | Administrative & support | 2017 |
| Artisan One Limited | Manufacturing | 2009 |
| AS Engineering Services Ltd | Manufacturing | 2026 |
| Asbw Limited | Administrative & support | 2010 |
| Asec Software Limited | Professional & scientific | 2019 |
| ASH and ASH Limited | Health & social care | 2019 |
| Ashcroft and Hillary Ltd | Construction | 2018 |
| Ashcroft Homecare Limited | Health & social care | 2007 |
| Ashley Alice Ltd | Wholesale & retail | 2025 |
| Ashton Inns Ltd | Hospitality | 2023 |
| Ashtree Services NW Ltd | Professional & scientific | 2025 |
| Ashworth Property Partners Ltd | Real estate | 2025 |
| ASL Stone Company Ltd | Manufacturing | 2011 |
| ASP Endurance Ltd | Education | 2026 |
| Assured Concrete Repairs Ltd | Real estate | 2013 |
| Assured Support Ltd | Health & social care | 2015 |
| Athertons Holidays Ltd | Real estate | 2020 |
| Atlantic Contemporary Art Limited | Wholesale & retail | 2018 |
| Atlantic Sites Ltd | Information & communication | 2024 |
| Attainpr Limited | Information & communication | 2016 |
| Attentus Property Solutions Ltd | Professional & scientific | 2025 |
| AUS Investments Limited | Financial services | 2024 |
| Austech Facades UK Ltd | Construction | 2025 |
| Austins Roofing Limited | Construction | 2025 |
| Autool Grinders Limited | Manufacturing | 2000 |
| Autool Holdings Limited | Manufacturing | 2025 |
| Auxilium Delivery Solutions Limited | Administrative & support | 2023 |
| AVA Serviced Apartments Limited | Hospitality | 2019 |
| Aviemore Luxury Ltd | Professional & scientific | 2018 |
| Avocado Tree Holdings Ltd | Financial services | 2021 |
| AW + a Architects Ltd | Professional & scientific | 2020 |
| Awareprivacy Limited | Information & communication | 2018 |
| B & C Commercial Developments Limited | Construction | 2021 |
| B M H (Holdings) Limited | Real estate | 2008 |
| BA2 Holdings Limited | Financial services | 2024 |
| Backhouse Capital Ltd | Professional & scientific | 2026 |
| Backridge Holdings Limited | Wholesale & retail | 2017 |
| Bacs 2 Basics Limited | Professional & scientific | 2007 |
| Bacs to Basics Limited | Professional & scientific | 2008 |
| BAD Company Barbers Limited | Other services | 2024 |
| Badger & BEE Psychology Ltd | Health & social care | 2025 |
| Balmforth Financial Services Limited | Financial services | 2017 |
| Bambinos Boutique Daycare Ltd | Health & social care | 2014 |
| Banners Signs and Posters Ltd | Professional & scientific | 2022 |
| Barcode-It Limited | Wholesale & retail | 1999 |
| Bare Bar Ltd | Wholesale & retail | 2021 |
| Barker Brand Partnerships Ltd | Professional & scientific | 2025 |
| Barker Consulting Ltd | Extraterritorial | 2019 |