| AGT Plant and Machinery Hire Ltd | Administrative & support | 2020 |
| AH Tiling Ltd | Construction | 2026 |
| AHD Driver Training Ltd | Education | 2013 |
| AHK Aviation Consultancy Limited | Other services | 2020 |
| Aidrm Limited | Real estate | 2023 |
| Aika Consulting Ltd | Professional & scientific | 2022 |
| Aimconstructionandinterior Ltd | Construction | 2025 |
| Aims Network Limited | Information & communication | 2006 |
| Air (Ventilation) Designs Limited | Real estate | 1975 |
| Air Hub Limited | Transport & logistics | 2025 |
| Airfast Engineering Services Limited | Extraterritorial | 1976 |
| Airspace FTS Ltd | Transport & logistics | 2015 |
| AJ & BD Properties Limited | Real estate | 2025 |
| AJ & BD Services Limited | Wholesale & retail | 2023 |
| Ajc-Qc Limited | Information & communication | 2025 |
| AJD Aviation Limited | Professional & scientific | 2020 |
| AJF Renewable Energy Ltd | Construction | 2023 |
| AJK Estates Ltd | Real estate | 2025 |
| AJM BL Limited | Administrative & support | 2009 |
| AJW Construction Consulting Limited | Construction | 2014 |
| AK Coaches Ltd | Transport & logistics | 2016 |
| AK Properties (London) Limited | Real estate | 2022 |
| AKG Accountancy Limited | Professional & scientific | 2018 |
| Akhs Kitchen Ltd | Hospitality | 2025 |
| Akhurst & Co Limited | Administrative & support | 2024 |
| Akhurst Construction Services Limited | Construction | 2024 |
| Akhurst Modular Amasss Group Limited | Construction | 2023 |
| AKJ & Sons Building Services Limited | Construction | 2022 |
| AKL Sheetmetal Limited | Manufacturing | 2003 |
| AKM Brettle Ltd | Real estate | 2019 |
| Akosystems Limited | Manufacturing | 1994 |
| Aksante! Limited | Real estate | 2004 |
| Aksia Nominees Limited | Professional & scientific | 2005 |
| AL Shaam Bakery Ltd | Manufacturing | 2020 |
| Al-Shifa Elite Therapy Ltd | Health & social care | 2019 |
| Alacor Electrical Ltd | Energy | 2018 |
| Alacor Property Ltd | Real estate | 2023 |
| Alana Designs Ltd | Manufacturing | 2025 |
| Alatco Limited | Professional & scientific | 2023 |
| Albatross Glide Group Ltd | Information & communication | 2024 |
| Albatross Morals Ltd | Health & social care | 2022 |
| Alcape Holdings Limited | Wholesale & retail | 2017 |
| Alder Meadow Limited | Health & social care | 1994 |
| Aldridge Computer Consultants Ltd | Information & communication | 1995 |
| Aldwych Properties Limited | Construction | 1998 |
| Alert Alarms Limited | Other services | 2014 |
| Alexanderelitecoaching Ltd | Other services | 2026 |
| Alfabet Digital & Embroidery Limited | Administrative & support | 2024 |
| Alfreton Holdings Limited | Financial services | 2011 |
| Algoa Properties 2 Limited | Real estate | 2023 |
| ALI Midlands Services Limited | Professional & scientific | 2016 |
| ALI Qadr Healthcare Ltd | Health & social care | 2024 |
| Alison Lones Limited | Education | 2003 |
| ALL Day Vape Ltd | Wholesale & retail | 2026 |
| ALL Elite Motors Ltd | Wholesale & retail | 2026 |
| ALL Safe Plumbing Limited | Construction | 2020 |
| ALL the World's a Stage Limited | Administrative & support | 2019 |
| Allan Noble Limited | Information & communication | 1973 |
| Allans Shopping Centre Ltd | Wholesale & retail | 2003 |
| Allens Transport Holdings Limited | Financial services | 2020 |
| Allmahon Limited | Administrative & support | 2022 |
| Allskirt Ltd | Manufacturing | 2013 |
| Allure Aesthetics JEN Ltd | Other services | 2025 |
| Allvg SPV Ltd | Professional & scientific | 2022 |
| Alommiel Ltd | Manufacturing | 2025 |
| Alpha Marketing Partners Ltd | Administrative & support | 2023 |
| Alpha Payments Ltd | Administrative & support | 2010 |
| Alphafox Investments Ltd | Financial services | 2010 |
| Alphamation Limited | Manufacturing | 1982 |
| ALS Automotive Ltd | Wholesale & retail | 2024 |
| Alta Homes & Designs Limited | Real estate | 2018 |
| Alternative Cake Co Ltd | Wholesale & retail | 2025 |
| Althorp Residencies Limited | Hospitality | 2025 |
| Altitude UK Properties Ltd | Real estate | 2025 |
| Alto Access Services Ltd | Construction | 2022 |
| Alto Tech Holdings Limited | Administrative & support | 2019 |
| Alto Technology Search Ltd | Administrative & support | 2013 |
| Altus Business Consulting Limited | Professional & scientific | 2005 |
| Alveley Coffee Ltd | Hospitality | 2025 |
| Amarnani Dent Ltd | Health & social care | 2024 |
| Amazing Feat Limited | Arts & recreation | 2007 |
| AMB Trading Limited | Real estate | 2001 |
| Ambience Limited | Other services | 2003 |
| Amblebridge Solutions Ltd | Information & communication | 2015 |
| Amblecote Community Church | Other services | 2009 |
| Amblecote Holdings Ltd | Financial services | 2017 |
| Ambra Design Ltd | Administrative & support | 2006 |
| AMC Coaches Limited | Transport & logistics | 2026 |
| AMC Taxi Ltd | Wholesale & retail | 2025 |
| Amcanu'N Uchel Limited | Professional & scientific | 2010 |
| Amie True Musicians Ltd | Arts & recreation | 2024 |
| Ampersat 15 Limited | Professional & scientific | 2013 |
| AMW Courier Services Limited | Transport & logistics | 2019 |
| Analox Instruments Limited | Manufacturing | 2015 |
| Anchor Bay Developments Limited | Construction | 2007 |
| Anchor Chassis Cleaning Ltd | Administrative & support | 2017 |
| Anchor Logistics Limited | Transport & logistics | 2013 |
| Anchored House of Travel Ltd | Administrative & support | 2026 |
| Andian Holdings Ltd | Real estate | 2019 |
| Andian Specialist Fabrications Limited | Manufacturing | 2005 |