| A & a Transport (SW) Ltd | Transport & logistics | 2026 |
| A & J Griffiths Limited | Construction | 2006 |
| A & N Stevens Limited | Construction | 2015 |
| A & T Construction South West Ltd | Construction | 2022 |
| A & W South West Developers Limited | Construction | 2005 |
| A 2 Z Kids Limited | Wholesale & retail | 2006 |
| A a a Letting & Maintenance Ltd | Real estate | 2012 |
| A and G Medicalcare Ltd | Education | 2023 |
| A B Construction (Nationwide ) Ltd | Construction | 2019 |
| A Barker Design Ltd | Professional & scientific | 2023 |
| A Best PAY Limited | Hospitality | 2015 |
| A C Construction and Carpentry Ltd | Construction | 2020 |
| A C Redfern Limited | Health & social care | 2019 |
| A Covaci Ltd | Health & social care | 2015 |
| A E Stuart Limited | Financial services | 2020 |
| A E Stuart NO2 Limited | Financial services | 2014 |
| A El-Khayat Ltd | Health & social care | 2023 |
| A Hammett Limited | Information & communication | 2004 |
| A J (Plymouth) Limited | Hospitality | 2016 |
| A J Orme Plant Hire Limited | Construction | 2010 |
| A Kershaw Limited | Wholesale & retail | 2026 |
| A LEE Plastering Limited | Construction | 2021 |
| A Little Enhancement Ltd | Other services | 2019 |
| A Little Enhancement Training Academy Ltd | Other services | 2020 |
| A N Barr Industries Limited | Professional & scientific | 2010 |
| A N R Specialists Limited | Construction | 2017 |
| A P Plant South West Ltd | Construction | 2025 |
| A Point Limited | Construction | 2014 |
| A Pole Apart Ltd | Administrative & support | 2025 |
| A R C a Properties Limited | Construction | 2005 |
| A R Davey Limited | Construction | 2012 |
| A S Tyres & Autos Ltd | Wholesale & retail | 2024 |
| A Squared Films Limited | Information & communication | 2013 |
| A Star Auto Mechanics Ltd | Wholesale & retail | 2023 |
| A T Weaving Agricultural Contracting Limited | Agriculture & fishing | 2011 |
| A Thomas M/A Ltd | Arts & recreation | 2017 |
| A Touch of Magic by Sadie Ltd | Other services | 2024 |
| A Trip Outside Ltd | Wholesale & retail | 2025 |
| A Watts & Partners Limited | Health & social care | 2022 |
| A Whetton Services Ltd | Transport & logistics | 2024 |
| A&A Refrigeration Limited | Professional & scientific | 2005 |
| A&A Troop Holdings Ltd | Real estate | 2017 |
| A&L Ward Property Limited | Real estate | 2021 |
| A&R Properties Solutions Ltd | Real estate | 2024 |
| A&S 2014 Ltd | Hospitality | 2022 |
| A&S Cole Investments Limited | Extraterritorial | 2016 |
| A&S Exeter Ltd | Transport & logistics | 2025 |
| A&S Pharma Ltd | Wholesale & retail | 2024 |
| A&T Property Solutions Limited | Real estate | 2022 |
| A-OK9 Ltd | Wholesale & retail | 2019 |
| A-Plan Electrical Limited | Construction | 2012 |
| A.C. Hopkins (Taunton) Limited | Wholesale & retail | 1967 |
| A.D.M Project Consultancy Ltd | Other services | 2012 |
| A.E. Maiden Limited | Real estate | 1953 |
| A.E.Rickards Limited | Real estate | 1941 |
| A.G.T. Electrical (Exeter) Limited | Construction | 1974 |
| A.I.T Livestock Ltd | Agriculture & fishing | 2026 |
| A.J. Sands Limited | Professional & scientific | 1991 |
| A.K (Devon) Ltd | Real estate | 2015 |
| A.K. (North) Limited | Real estate | 2016 |
| A.L.Martin & Son,Limited | Wholesale & retail | 1951 |
| A.S & C.J Thorne Properties Ltd | Real estate | 2023 |
| A.S. Windows & Doors Ltd | Construction | 2022 |
| A.S.B Plumbing Services Ltd | Construction | 2023 |
| A.Y. (Falmouth) Ltd | Hospitality | 2023 |
| A/C 4 Services Limited | Arts & recreation | 1997 |
| A/S Watersports Ltd. | Wholesale & retail | 1992 |
| A1 Clutch and Service Centre Exeter Limited | Wholesale & retail | 2025 |
| A1 Fire and Security Ltd | Administrative & support | 2009 |
| A1 MOT & Service SW Ltd | Wholesale & retail | 2025 |
| A1 Precision Limited | Real estate | 2014 |
| A2B Global Media Limited | Information & communication | 2015 |
| A2Z Spice Ltd | Hospitality | 2023 |
| A2Z Wizards Limited | Wholesale & retail | 2016 |
| AA Capital Investment Ltd | Real estate | 2019 |
| Aactron Equipment Co. Limited | Manufacturing | 2003 |
| Aadhya Services Ltd | Transport & logistics | 2021 |
| Aambrose Ltd | Health & social care | 2022 |
| Aardvark Aggregates Ltd | Water & waste | 2022 |
| Aardvark and Mullet Property Services Limited | Real estate | 2017 |
| Aardvark Commercials Ltd | Wholesale & retail | 2020 |
| Aaron Mclean Engineering Limited | Professional & scientific | 2015 |
| Aaronberg Ltd | Wholesale & retail | 2019 |
| Aasw Ltd | Professional & scientific | 2025 |
| AB Broker Services Limited | Financial services | 2024 |
| AB Grounds Maintenance Ltd | Administrative & support | 2023 |
| AB Multimedia Limited | Information & communication | 2004 |
| AB Universal Limited | Education | 2022 |
| Aba-Text (UK) Limited | Administrative & support | 1998 |
| Abalone Productions Ltd | Professional & scientific | 2013 |
| Abas Drylining & Construction Co. Ltd | Construction | 1986 |
| Abbey Court (Poundbury) Management Company Limited | Real estate | 2019 |
| Abbey Estates Development Company (Alperton) Limited | Real estate | 1933 |
| Abbey Grill Limited | Hospitality | 2016 |
| Abbey Newco Limited | Information & communication | 2021 |
| Abbeybourn Properties Limited | Real estate | 2021 |
| Abbeywood Housecare Limited | Health & social care | 2000 |
| Abbots Vale Management Company Limited | Households | 1985 |
| ABC Cladding South West Limited | Construction | 2024 |
| ABD Lettings Limited | Real estate | 2023 |