| Adele Hilton Ltd | Health & social care | 2019 |
| Aden Medical Services Limited | Health & social care | 2013 |
| Adil Hussain 97 Ltd | Transport & logistics | 2025 |
| Adma One Limited | Information & communication | 2017 |
| Admergill Hall Farm Ltd | Agriculture & fishing | 2026 |
| Adore Home Care Ltd | Health & social care | 2011 |
| Adore Training Centre Limited | Education | 2019 |
| Adorn Studios Ltd | Professional & scientific | 2025 |
| Adpak Machinery Systems Holdings Limited | Financial services | 2025 |
| Adpak Machinery Systems Limited | Manufacturing | 1987 |
| Adrianstg Construction Ltd | Construction | 2024 |
| Advance Learning Centre Limited | Education | 2010 |
| Advance Point Management Company Limited | Real estate | 2023 |
| Advanced Manufacturing Group Limited | Professional & scientific | 2022 |
| Advie Developments Ltd | Construction | 2025 |
| Aeonian Solutions Ltd | Professional & scientific | 2015 |
| Aesthetics by ALR Ltd | Other services | 2024 |
| Aether Learning Limited | Education | 2020 |
| Aether Yoga Ltd | Information & communication | 2024 |
| AF Pound Plus Ltd | Wholesale & retail | 2022 |
| Affordable Denim Limited | Wholesale & retail | 2024 |
| Affordable Haulage Limited | Transport & logistics | 2019 |
| Affordable Resin Limited | Manufacturing | 2019 |
| AFL Properties Limited | Real estate | 2020 |
| Afsl Holdings Ltd | Financial services | 2023 |
| Aftab Iqbal Vision UK Limited | Information & communication | 2024 |
| Afzal Traders Limited | Wholesale & retail | 2024 |
| AG Bunkers Ltd | Wholesale & retail | 2026 |
| Agenda Boxes & Packaging Ltd | Manufacturing | 2015 |
| AH Eliteclean Services Ltd | Administrative & support | 2025 |
| AH Interior (Nelson) Ltd | Wholesale & retail | 2011 |
| AH Vita Limited | Wholesale & retail | 2025 |
| AHK Logistics Limited | Transport & logistics | 2020 |
| Ahkb Ltd | Other services | 2025 |
| AHM Packaging Limited | Manufacturing | 2002 |
| Ahmad Food Store Limited | Wholesale & retail | 2025 |
| Ahmed Anjum & Co Ltd | Professional & scientific | 2023 |
| Ahmed Beverage Limited | Wholesale & retail | 2026 |
| Ahmeds Consulting Limited | Administrative & support | 2015 |
| Ahmh Properties Limited | Real estate | 2023 |
| Ahnah Investments Limited | Real estate | 2026 |
| Ahsu Prime Cart Ltd | Wholesale & retail | 2026 |
| Ahtishamenterprises Ltd | Wholesale & retail | 2023 |
| AI & Sons Trading Company, Ltd | Transport & logistics | 2023 |
| AIA Property Holdings Ltd | Real estate | 2024 |
| Aidm UK Academy Ltd | Information & communication | 2021 |
| AIKERS10 Limited | Professional & scientific | 2022 |
| Aimlu Limited | Wholesale & retail | 2024 |
| Ainsworths Financial Services Limited | Professional & scientific | 2000 |
| Airedale Cleaning Services Limited | Administrative & support | 2023 |
| Airmode Limited | Extraterritorial | 2018 |
| AJ Driving School (Nelson) Ltd | Education | 2023 |
| AJ Morris Plastering and Construction Limited | Construction | 2021 |
| AJ Renovations Ltd | Construction | 2025 |
| Aj&Sons Logistocs Ltd | Transport & logistics | 2025 |
| Aj’S Products Ltd | Wholesale & retail | 2021 |
| AK & Sons Management Ltd | Construction | 2025 |
| AK Audiology (Lancs) Ltd | Health & social care | 2023 |
| AK Club Limited | Administrative & support | 2024 |
| AK Foods Ltd | Wholesale & retail | 2022 |
| AK Group Ltd | Households | 2021 |
| AK K9 Security Group Ltd | Administrative & support | 2023 |
| AKN Team Ltd | Professional & scientific | 2023 |
| Akomm Properties Ltd | Real estate | 2025 |
| Akomm Structured Cabling Specialists Ltd | Information & communication | 2015 |
| AKX Motoring Solutions Limited | Wholesale & retail | 2022 |
| AL AIN Security Group Ltd | Administrative & support | 2021 |
| AL Jaleel Ltd | Wholesale & retail | 2023 |
| AL Khalid Transport Ltd | Transport & logistics | 2023 |
| Al-Kareem NW Ltd | Manufacturing | 2024 |
| Alaias Brunch Ltd | Hospitality | 2025 |
| Alannah Jade Counselling Ltd | Health & social care | 2022 |
| Alba Logistics Limited | Transport & logistics | 2021 |
| Albert Manchester Ltd | Professional & scientific | 2024 |
| Alex KLN Ltd | Transport & logistics | 2025 |
| Alexandra's Billiard's Hall Limited | Arts & recreation | 2025 |
| Alexton Travel Limited | Administrative & support | 2025 |
| Alfa Protection Ltd | Administrative & support | 2022 |
| Alfa Specs Limited | Wholesale & retail | 2017 |
| Alfies 94 Ltd | Hospitality | 2026 |
| Alfies Takeaway Ltd | Administrative & support | 2017 |
| ALI Awais & Co Limited | Health & social care | 2016 |
| ALI Jewellers Ltd | Wholesale & retail | 2024 |
| Alishan Pharma Ltd | Health & social care | 2025 |
| ALL Nations Dance Events Limited | Arts & recreation | 2022 |
| ALL YOU Ever Wished for Limited | Professional & scientific | 2003 |
| Allen's 1956 Limited | Wholesale & retail | 2003 |
| Allertex Holdings Limited | Financial services | 2011 |
| Allertex Limited | Wholesale & retail | 2006 |
| Allodose Ltd | Health & social care | 2022 |
| Alloid Company Limited | Health & social care | 2019 |
| Allscope Holdings Limited | Manufacturing | 2018 |
| Allscope Projects Limited | Manufacturing | 2005 |
| Alltrack Promotions Limited | Arts & recreation | 2016 |
| Allure Medispa & Laser Clinic Limited | Other services | 2017 |
| Almahratours Ltd | Administrative & support | 2025 |
| Alpha Auto Group Limited | Wholesale & retail | 2025 |
| Alpha Brierfield Ltd | Hospitality | 2022 |
| Alpha One SEO Ltd | Professional & scientific | 2024 |
| Alpha Print and Signs Limited | Manufacturing | 2025 |