| Active Food Ltd | Hospitality | 2018 |
| Active Gloucestershire | Arts & recreation | 2010 |
| Active Hideout Ltd | Wholesale & retail | 2023 |
| Active Rehab Clinic Physio Ltd | Health & social care | 2017 |
| Actually Marketing Limited | Real estate | 2017 |
| ACV Logistic Ltd | Transport & logistics | 2022 |
| AD Car Repair Service Ltd | Wholesale & retail | 2020 |
| AD Coffee Company Limited | Wholesale & retail | 2025 |
| AD Developments (Ebley) Limited | Construction | 2022 |
| AD Plus Solutions Ltd | Administrative & support | 2026 |
| Adam Lott Pest Control Limited | Administrative & support | 2010 |
| Adam Till Valuations Limited | Real estate | 2023 |
| Adams General and Precision Engineering Ltd | Manufacturing | 2011 |
| Adams Industrial Ltd | Construction | 2015 |
| Adapt Central Ltd | Education | 2025 |
| Adaptive Interiors Limited | Construction | 2022 |
| Adawy Secure Ltd | Administrative & support | 2025 |
| ADD LIV Ltd | Professional & scientific | 2019 |
| Addison Ventures Limited | Financial services | 2026 |
| Adegun Services Ltd | Construction | 2018 |
| Adeleuk Ltd | Wholesale & retail | 2013 |
| Adelfos Consulting Limited | Information & communication | 2025 |
| Adept Precision Limited | Manufacturing | 2016 |
| Adeyusuff Ltd | Health & social care | 2014 |
| ADH Consultancy Ltd | Professional & scientific | 2020 |
| ADH Contracting Ltd | Construction | 2024 |
| Adisha Enterprise Ltd | Professional & scientific | 2018 |
| ADJ Construction Services Ltd | Construction | 2026 |
| ADK Communications Limited | Wholesale & retail | 2024 |
| ADL Mechanical & Electrical Contractors Ltd | Construction | 2012 |
| ADL Property Investments Ltd | Real estate | 2019 |
| Adla Properties Limited | Real estate | 2021 |
| Adliv Solutions Ltd | Financial services | 2006 |
| ADM Gloucestershire Ltd | Health & social care | 2018 |
| ADM Pallets Limited | Wholesale & retail | 2003 |
| ADM Services (Gloucester) Ltd | Real estate | 2018 |
| Administrator Jobs Ltd | Information & communication | 2019 |
| Admove Media Limited | Professional & scientific | 2022 |
| Adnet Precision Engineering Limited | Professional & scientific | 2004 |
| Adrian Group of Companies Ltd | Wholesale & retail | 2026 |
| ADS Architecture Limited | Professional & scientific | 2008 |
| ADS Caravan Services Ltd | Wholesale & retail | 2025 |
| Adtech Business Systems Limited | Wholesale & retail | 1977 |
| Adularia Therapies and Consultancy "Independent Living" Limited | Health & social care | 2016 |
| Adularia Therapies and Consultancy Ltd | Health & social care | 2010 |
| Adularia Therapies and Consultancy Sussex Limited | Health & social care | 2016 |
| Adult Psychiatry Limited | Health & social care | 2025 |
| ADV Electrical Contractors Ltd | Construction | 2024 |
| Advancd Ltd | Professional & scientific | 2020 |
| Advanced Drylining Limited | Construction | 2005 |
| Advanced Electronics & Logistics Limited | Manufacturing | 2003 |
| Advanced Grinding Supplies Ltd | Wholesale & retail | 2006 |
| Advanced Innergy Contracting Ltd | Mining & quarrying | 2008 |
| Advanced Innergy EBT Ltd | Extraterritorial | 2017 |
| Advanced Innergy Group Ltd | Professional & scientific | 2014 |
| Advanced Innergy Holdings Ltd | Professional & scientific | 2014 |
| Advanced Innergy Ltd | Professional & scientific | 2007 |
| Advanced Innergy Solutions Ltd | Manufacturing | 1989 |
| Advanced Innergy Testing Ltd | Professional & scientific | 2003 |
| Advanced Insulation Systems Ltd | Manufacturing | 2008 |
| Advanced Medical Aesthetics Ltd | Health & social care | 2003 |
| Advantec Internet Services Limited | Information & communication | 2008 |
| Adventure Agnew Limited | Other services | 2025 |
| Adverto Media Ltd | Professional & scientific | 2022 |
| Adverto Properties Ltd | Real estate | 2026 |
| Adylary Cargo Ltd | Transport & logistics | 2018 |
| AEA Property Investments Ltd | Real estate | 2024 |
| Aegis Amyna Limited | Administrative & support | 2020 |
| Aegis Precision Ltd | Manufacturing | 2025 |
| Aegis Skills Ltd | Education | 2011 |
| AEJ Hooper Ltd | Real estate | 2023 |
| Aerospa UK Limited | Manufacturing | 2006 |
| Aerotiques Ltd | Manufacturing | 2017 |
| Aerotorque Engineering Ltd | Professional & scientific | 2026 |
| Aesthetic Home Designs Ltd | Wholesale & retail | 2025 |
| Aetheriq Ltd | Information & communication | 2025 |
| Aevo-Cx Ltd | Professional & scientific | 2026 |
| AF Food Tech Ltd | Hospitality | 2026 |
| AF Orthopaedics Ltd | Health & social care | 2024 |
| Affirm Payroll Ltd | Professional & scientific | 2026 |
| Affordable Abode PVT Ltd | Real estate | 2024 |
| Affordable Used Cars Ltd | Wholesale & retail | 2025 |
| AFH Groundcare Ltd | Administrative & support | 2022 |
| Afifa Riaz Ltd | Wholesale & retail | 2026 |
| Afion Media Limited | Professional & scientific | 2007 |
| Afiyah Collection Ltd | Wholesale & retail | 2021 |
| Afkf Ltd | Transport & logistics | 2018 |
| Africa Unite Limited | Hospitality | 2012 |
| Afristudylink Limited | Financial services | 2025 |
| AG Business Consultancy Ltd | Professional & scientific | 2024 |
| AG Cyber Ltd | Information & communication | 2022 |
| AG Pest Management Limited | Agriculture & fishing | 2003 |
| AG Productions Ltd | Wholesale & retail | 2025 |
| Agdasb Limited | Wholesale & retail | 2024 |
| AGE Concern Gloucestershire | Other services | 2005 |
| Ager Projects Ltd | Construction | 2026 |
| AGH Aircraft Engineering Ltd | Manufacturing | 2023 |
| AGH Enterprises Limited | Construction | 1998 |
| Agila Transport and Services Ltd | Transport & logistics | 2014 |
| AGL Real Estate Limited | Real estate | 2026 |