| APEX7 Limited | Construction | 2026 |
| Apple a Day Medical Limited | Health & social care | 2023 |
| Appledore Mansions Management Company Limited | Households | 2011 |
| Applewharf Management Limited | Real estate | 1989 |
| Apply Gateway Ltd | Information & communication | 2017 |
| Approved Electrical Services SW Ltd | Construction | 2024 |
| APS Energy Ventures Limited | Energy | 2025 |
| Apubco Ltd | Hospitality | 2023 |
| Aqua Botanika Limited | Agriculture & fishing | 2020 |
| Aqua Landscapes & Groundworks Ltd | Administrative & support | 2024 |
| Aquaemi Ltd | Wholesale & retail | 2022 |
| Aquagas Limited | Construction | 2002 |
| Aqualytica Limited | Professional & scientific | 2025 |
| Aquator Limited | Wholesale & retail | 2019 |
| AR Lyons and L Lyons LLP | | 2017 |
| AR Quantity Surveying SW Ltd | Professional & scientific | 2026 |
| Arasi Stores Ltd | Wholesale & retail | 2024 |
| ARB Electrical Contractors Ltd | Construction | 2025 |
| Arbor Design Ltd | Professional & scientific | 2019 |
| ARC Marine Group Limited | Professional & scientific | 2021 |
| ARC Marine Ltd | Professional & scientific | 2015 |
| Arcabie Limited | Hospitality | 2013 |
| Arden Close Flats Management Limited | Households | 2007 |
| Ardenny Court Management Company (Exmouth) Limited | Households | 1978 |
| Arena Academy CIC | Information & communication | 2026 |
| Arenbrock Limited | Professional & scientific | 1976 |
| Argo Recruitment Services Limited | Administrative & support | 2006 |
| Arisa Optical Limited | Wholesale & retail | 2016 |
| Arise and Shine South West Ltd | Other services | 2023 |
| Arlis Properties Limited | Construction | 1981 |
| Armadillo Homes Ltd | Real estate | 2025 |
| Armor Micro Limited | Wholesale & retail | 2012 |
| Armor Services Limited | Wholesale & retail | 2007 |
| Aroma Grill Limited | Hospitality | 2020 |
| ARP (UK) Accounting Services Limited | Professional & scientific | 2010 |
| Artful Dodger (Exeter) Limited | Real estate | 2011 |
| Artificial Grass International Limited | Wholesale & retail | 2017 |
| Artists - Together Ltd | Arts & recreation | 2025 |
| Artizan Collective CIC | Arts & recreation | 2015 |
| As&P Managing Consultants Ltd | Real estate | 2018 |
| Ashdown Project Services Limited | Professional & scientific | 2021 |
| Asheldon House (Torquay) Limited | Households | 1961 |
| Asheldon Manor Residents Ltd | Households | 1999 |
| Asheldon Properties Ltd | Real estate | 2021 |
| Ashfield Rise (Torquay) Management Limited | Real estate | 2003 |
| Ashforth Heating & Electrical Services Ltd | Construction | 2026 |
| Ashima Ltd | Health & social care | 2019 |
| Ashleigh Court (Maintenance) Company Limited | Administrative & support | 1970 |
| Ashton House Design Limited | Wholesale & retail | 2004 |
| Ashvire Limited | Professional & scientific | 2017 |
| Ashwood Court (N.A.) Management Company Limited | Households | 2005 |
| Asian Restaurant Owners Network Limited | Professional & scientific | 2017 |
| ASK Doherty Ltd | Health & social care | 2012 |
| Asp's Building Services Limited | Construction | 2023 |
| Aspect House Management Company Limited | Households | 2005 |
| Aspire Direct Marketing Ltd | Wholesale & retail | 2019 |
| Aspire Electrical Holdings Ltd | Financial services | 2021 |
| Aspire Electrical Limited | Construction | 2004 |
| Aspire Electrical SW Limited | Construction | 2025 |
| Aspire Homes and Developments Limited | Construction | 2022 |
| Asset Intel Ltd | Professional & scientific | 2026 |
| Assured Property Developments (SW) Ltd | Construction | 2023 |
| Astalyn + Ltd | Wholesale & retail | 2026 |
| Astalyn Limited | Wholesale & retail | 2025 |
| Astalyn Stickers Ltd | Wholesale & retail | 2026 |
| Astuce Limited | Administrative & support | 2015 |
| AT Your Best Ltd | Health & social care | 2020 |
| Athelney Management Torquay Limited | Households | 2009 |
| Atheneum AI Holdings Ltd | Financial services | 2026 |
| Atheneum AI Ltd | Information & communication | 2026 |
| Atherton Project Management Services Limited | Professional & scientific | 2005 |
| ATL Coaching Ltd | Other services | 2025 |
| Atlantic Coast Investments Limited | Real estate | 2024 |
| Atlas Flooring (South West) Limited | Administrative & support | 2008 |
| AU Bord DE LA MER Torquay Limited | Hospitality | 2014 |
| Audiovisual Southwest Limited | Construction | 2007 |
| Autexo Devon Ltd | Wholesale & retail | 2026 |
| Autistic After Hours Community Interest Company | Other services | 2023 |
| Autotest & Repair Limited | Wholesale & retail | 2007 |
| Av-Xchangehub Ltd | Information & communication | 2025 |
| Avanti Carus Limited | Other services | 2018 |
| Avengers Couriers Limited | Transport & logistics | 2019 |
| Avenir' Invest Limited | Construction | 2013 |
| Avenue Court Management Company (Torquay) Limited | Households | 2011 |
| Avenue Lodge Management Company Limited | Real estate | 1984 |
| Avenue Services Limited | Real estate | 2006 |
| Avisec Training Ltd | Education | 2025 |
| AW4 Limited | Real estate | 2021 |
| AWC (D & B) Contractors Ltd | Construction | 2024 |
| Axcess Employment SW Ltd | Administrative & support | 2022 |
| Axcess Groundworks SW Ltd | Construction | 2025 |
| Aylin's Pizza Ltd | Hospitality | 2023 |
| Aypon Flat Management Limited | Households | 1996 |
| Ayur at Pilgrims Limited | Hospitality | 2013 |
| AYW (Events) Limited | Hospitality | 2025 |
| AZ Greenfix Homehub Ltd | Transport & logistics | 2026 |
| Azure Property Development Ltd | Construction | 2014 |
| B & W Plastering & Drylining Limited | Construction | 2014 |
| B DRY Roofing Limited | Construction | 2015 |
| B. Thompson & Sons (Transport) Limited | Transport & logistics | 1966 |