| ADR Construction Limited | Construction | 2016 |
| ADR Home Innovations Ltd | Information & communication | 2008 |
| Adrian Marin Ltd | Transport & logistics | 2018 |
| Adrian Services Bristol Ltd | Other services | 2020 |
| Adrian Sherratt Photography Limited | Information & communication | 2010 |
| Adrian Stoute Landscaping Ltd | Construction | 2018 |
| Adrian Wheale Consultancy Ltd | Professional & scientific | 2021 |
| Adrianne Reid Educational Psychology Ltd | Education | 2022 |
| Adroc Limited | Administrative & support | 2011 |
| Adroitprint Limited | Manufacturing | 2021 |
| ADS Automotive Limited | Wholesale & retail | 2005 |
| ADS Media Partnership | | 2002 |
| ADS West Automotive Ltd | Wholesale & retail | 2021 |
| Adsharan Properties Ltd | Real estate | 2026 |
| Adsm Consultancy Limited | Other services | 2013 |
| ADT Accountants and Taxation Advisors Ltd | Professional & scientific | 2013 |
| Adtops Solution Ltd | Professional & scientific | 2022 |
| ADU Properties Ltd | Real estate | 2023 |
| Adulthumanfemale.Store Limited | Wholesale & retail | 2021 |
| Adur Ltd | Other services | 2022 |
| Advance Bidco Limited | Professional & scientific | 2015 |
| Advance Marine Limited | Wholesale & retail | 2006 |
| Advance Pest Control Bristol Limited | Administrative & support | 2018 |
| Advance Tiling Ltd | Construction | 2024 |
| Advance Topco Limited | Professional & scientific | 2015 |
| Advanced Appliance Care Limited | Other services | 1995 |
| Advanced Autocooling (Bristol) Limited | Wholesale & retail | 2004 |
| Advanced Build Concepts Limited | Construction | 2012 |
| Advanced Car Care (Bristol) Ltd | Wholesale & retail | 2025 |
| Advanced Car Care Limited | Wholesale & retail | 2009 |
| Advanced Control Systems Engineering Ltd | Information & communication | 2019 |
| Advanced Diamondx Ltd | Manufacturing | 2018 |
| Advanced Education Solutions Ltd | Education | 2026 |
| Advanced Electrical Southwest Ltd | Construction | 2013 |
| Advanced Fencing & Landscaping Limited | Administrative & support | 2019 |
| Advanced Fire Security Limited | Construction | 2010 |
| Advanced Fire Systems Limited | Construction | 2003 |
| Advanced Glass & Glazing Limited | Construction | 2003 |
| Advanced Integrated Systems Ltd | Construction | 2004 |
| Advanced Mechanical Systems Ltd | Professional & scientific | 2014 |
| Advanced Method Plastic Surgery Group Ltd | Health & social care | 2026 |
| Advanced Mineral Processing Limited | Administrative & support | 2018 |
| Advanced Plumbing & Heating (Bristol) Limited | Construction | 2002 |
| Advanced Plumbing and Heating Limited | Construction | 1989 |
| Advanced Power Sweeping Limited | Administrative & support | 2015 |
| Advanced Product Consulting Limited | Information & communication | 2016 |
| Advanced Systems South West Ltd | Administrative & support | 2019 |
| Advanced Turbochargers Limited | Wholesale & retail | 2020 |
| Advanced Vetcare Ltd | Extraterritorial | 2007 |
| Advantage Financial Solutions Ltd | Financial services | 2019 |
| Advantage Forwarding UK Limited | Transport & logistics | 2021 |
| Advantage Genetics Ltd | Professional & scientific | 2022 |
| Advantage Software Limited | Information & communication | 2013 |
| Advantis Control Solutions Limited | Manufacturing | 2012 |
| Adventura Ltd | Administrative & support | 2024 |
| Adventure Awaits YOU (Bristol) Ltd | Administrative & support | 2021 |
| Adventure Digs Bristol Limited | Hospitality | 2025 |
| Adventure Digs Limited | Real estate | 2022 |
| Adventure Junction Ltd | Wholesale & retail | 2025 |
| Adventurous Activity Company Limited | Arts & recreation | 2000 |
| Adventus Ltd. | Professional & scientific | 2000 |
| Advise and Protect Limited | Financial services | 2012 |
| Adviser Compass Ltd | Professional & scientific | 2026 |
| ADW Power Ltd | Construction | 2025 |
| Adway Marketing Ltd | Administrative & support | 2024 |
| ADY RO Trans Ltd | Transport & logistics | 2021 |
| Adya PVT Ltd | Real estate | 2025 |
| Adysporting Trans Ltd | Transport & logistics | 2022 |
| Adzally Limited | Other services | 2021 |
| Adzeronem Ltd | Professional & scientific | 2014 |
| AE Dance & Fitness Ltd | Education | 2022 |
| AE Sheppard Ltd | Households | 2018 |
| AEC Services UK Limited | Professional & scientific | 2007 |
| Aedapt Ltd | Manufacturing | 2013 |
| Aedis Property Limited | Real estate | 2021 |
| Aeei Developments Limited | Real estate | 2024 |
| Aegis Building Contractors Limited | Construction | 2003 |
| Aegis Consulting Solutions Ltd | Information & communication | 2015 |
| Aegis Healthcare Ltd | Health & social care | 2019 |
| Aegiscore FM Ltd | Real estate | 2025 |
| AEH Property (SW) Limited | Real estate | 2025 |
| AEI Partners Ltd | Education | 2025 |
| Aek-Boco FC Ltd | Arts & recreation | 2005 |
| Aek-Boco FC Trading Ltd | Arts & recreation | 2009 |
| Aelenduria Limited | Administrative & support | 2021 |
| Aelf Engineering Ltd. | Professional & scientific | 2012 |
| Aelysia Ltd | Other services | 2021 |
| AEM Group (Bristol) Ltd | Manufacturing | 2012 |
| Aeolia Offshore Engineering Limited | Construction | 2021 |
| Aeonflare Ltd | Information & communication | 2023 |
| Aequitas Parking Management Limited | Transport & logistics | 2025 |
| Aerial Geomatics Limited | Professional & scientific | 2023 |
| Aero Accountancy Services Limited | Professional & scientific | 2008 |
| Aero Kinetics Limited | Professional & scientific | 2017 |
| Aerodesign Ltd | Professional & scientific | 1995 |
| Aeroengm Limited | Administrative & support | 2024 |
| Aerofleece Limited | Hospitality | 2009 |
| Aerofleece Properties Limited | Real estate | 2017 |
| Aerolyte Ltd | Wholesale & retail | 2025 |
| Aeromasters Limited | Professional & scientific | 2006 |