| Ailly Ltd | Professional & scientific | 2025 |
| Ailo Studios Ltd | Other services | 2026 |
| AIM Big Ltd | Administrative & support | 2024 |
| Ainslie Automotive Ltd | Wholesale & retail | 2025 |
| Air Industries Ltd | Wholesale & retail | 2016 |
| Air Vent Services Ltd | Construction | 2018 |
| Airbnkey Ltd | Hospitality | 2023 |
| Aircore Compressor Engineers Ltd | Manufacturing | 2026 |
| Airlevate Ltd | Transport & logistics | 2025 |
| Airport Business Centre Limited | Real estate | 2003 |
| Airsoft Engravers Ltd | Wholesale & retail | 2021 |
| Aisat Ltd | Information & communication | 2018 |
| AJ & Co.(Devon) Ltd | Health & social care | 2000 |
| AJ Global Services Limited | Wholesale & retail | 2025 |
| AJ Newman Group Ltd | Financial services | 2025 |
| AJ Ocean Properties Ltd | Real estate | 2025 |
| AJA 539 Ltd | Hospitality | 2024 |
| AJB Risk Management Limited | Professional & scientific | 2022 |
| AJC Surveys Ltd | Professional & scientific | 2017 |
| AJD Joinery Ltd | Construction | 2020 |
| AJH Advocacy Limited | Professional & scientific | 2022 |
| Ajharrad Property Ltd | Construction | 2025 |
| AJL Groundworks & Civil Engineering Ltd | Construction | 2023 |
| AJL Groundworks Limited | Construction | 2016 |
| AJM Automotive Ltd | Wholesale & retail | 2026 |
| AJM Building Design Consultancy Ltd | Professional & scientific | 2024 |
| AJM Building Design Limited | Professional & scientific | 2008 |
| AJM Construction Services SW Ltd | Professional & scientific | 2023 |
| AJO Chase Ltd | Real estate | 2023 |
| AJP Advisory Services Ltd | Professional & scientific | 2024 |
| AJP Consultants (South West) Ltd | Professional & scientific | 2015 |
| AJW Plymouth Properties Ltd | Real estate | 2025 |
| AK (SW) Ltd | Wholesale & retail | 2025 |
| AK Bodyshop (SW) Ltd | Wholesale & retail | 2022 |
| AK Bricklaying Limited | Construction | 2019 |
| AK Car and Commercial (SW) Ltd | Wholesale & retail | 2025 |
| AK Car and Commercials Ltd | Wholesale & retail | 2017 |
| AK Wrapz Ltd | Professional & scientific | 2022 |
| Akara Properties Ltd | Real estate | 2024 |
| AKB Services Ltd | Professional & scientific | 2019 |
| Akbar Optics Ltd | Health & social care | 2026 |
| Aken Ansg Ltd | Health & social care | 2025 |
| AKERMAN99 Investments Limited | Real estate | 2024 |
| Akia Property Services Ltd | Real estate | 2025 |
| Akiva Ltd | Wholesale & retail | 2024 |
| Akkc Management Ltd | Households | 2025 |
| Akkc Solutions Limited | Real estate | 2025 |
| Akshyss Events Ltd | Other services | 2009 |
| AL Paninio’S Ltd | Hospitality | 2024 |
| AL Properties (SW) Ltd | Real estate | 2024 |
| Al's Auto Services (SW) Ltd | Wholesale & retail | 2014 |
| Al-Bashir Cardiac Surgery Ltd | Health & social care | 2024 |
| Al-Khuda Zawiya Ltd | Education | 2025 |
| Alamo Monitoring Limited | Professional & scientific | 2014 |
| Alan Clancy Drylining Limited | Construction | 2020 |
| Alan Cummings & Co (Elburton) Limited | Real estate | 2003 |
| Alan Forrester & Co Ltd | Professional & scientific | 2018 |
| Alan Heath Ltd | Other services | 2014 |
| Alan Pearson Wealth Management Ltd | Administrative & support | 2020 |
| Alan Skuse Car, Van and Truck Parts Ltd | Wholesale & retail | 2001 |
| Alandernewie Ltd | Construction | 2015 |
| Alanna Metcalfe Ltd | Health & social care | 2023 |
| Alayna & Chloe Holdings Limited | Financial services | 2019 |
| ALB Steel Fixers Limited | Construction | 2023 |
| Albert Court (Saltash) Management Company Limited | Households | 2005 |
| Albion Park 1 (Plymouth) Management Company Limited | Households | 2004 |
| Albion Park 2 (Plymouth) Management Company Limited | Households | 2004 |
| Alcodrops Ltd | Wholesale & retail | 2019 |
| Alcoholic Drinks Ltd | Wholesale & retail | 2019 |
| Alcomsoft Ltd | Information & communication | 2006 |
| Alderman Engineering Holdings Limited | Financial services | 2023 |
| Alert Drivers Training and Development Limited | Education | 2018 |
| Alestica Global Resources Ltd | Health & social care | 2025 |
| Alex 2020 Limited | Transport & logistics | 2020 |
| Alex RAY Specialist Cleaning Ltd | Administrative & support | 2020 |
| Alexa International Limited | Administrative & support | 2024 |
| Alexander and Ellis Limited | Construction | 2017 |
| Alexander Crawford Forbes Consulting Limited | Information & communication | 2026 |
| Alexander Elliot Developments Ltd | Construction | 2019 |
| Alexander Luxury Living & Dining Ltd | Construction | 2025 |
| Alexander Partnership Ltd | Professional & scientific | 2019 |
| Alexander Rose Holdings Ltd | Professional & scientific | 2020 |
| Alexander Rose Lettings Ltd | Real estate | 2020 |
| Alexander's Assistance Ltd | Administrative & support | 2025 |
| Alexandra AW Management Ltd | Arts & recreation | 2024 |
| Alexandra Housing Limited | Health & social care | 2013 |
| Alexandra Residential Management Limited | Real estate | 1998 |
| Alexandrei Ltd | Wholesale & retail | 2014 |
| Alexandru Suharoschi Ltd | Wholesale & retail | 2018 |
| Alexrep Limited | Households | 1985 |
| Alfa Group Southwest Ltd | Transport & logistics | 2026 |
| Alfa Travel and Transport Ltd | Transport & logistics | 2026 |
| Alford Electrical Services Ltd | Construction | 2018 |
| Alford Holdings Ltd | Real estate | 2023 |
| Algo Alchemy Ltd | Information & communication | 2023 |
| ALH Trades Ltd | Wholesale & retail | 2026 |
| Ali's Car Services Ltd | Wholesale & retail | 2023 |
| Alibey Property Investment Ltd | Real estate | 2023 |
| Align MEP Management Limited | Professional & scientific | 2025 |
| ALL About Roofing Limited | Construction | 2002 |