| 101 Detailing Ltd | Wholesale & retail | 2021 |
| 168 Express Ltd | Wholesale & retail | 2014 |
| 2 Sisters Haulage Ltd | Transport & logistics | 2019 |
| 21-24 ASH Tree Road (NP26 5NU) Freehold Limited | Real estate | 2026 |
| 2FEETBELOW Ltd | Professional & scientific | 2012 |
| 2JF Electrical Ltd | Construction | 2022 |
| 7 Nineteen Limited | Real estate | 2019 |
| 7 Summits Vintage Ltd | Wholesale & retail | 2026 |
| A & E Properties (SW) Limited | Real estate | 2025 |
| A & L Electrical Solutions Limited | Construction | 2017 |
| A 2 Z Taxis Monmouthshire Ltd | Transport & logistics | 2017 |
| A Cochrane Limited | Construction | 2009 |
| A Gall Property Limited | Real estate | 2023 |
| A Novel Retreat Ltd | Real estate | 2024 |
| Aastel Limited | Manufacturing | 2019 |
| Aber Employment Ltd | Administrative & support | 2024 |
| Abergwenllan Limited | Agriculture & fishing | 2016 |
| Abjo Group Ltd | Construction | 2021 |
| Able 2 Train Limited | Education | 2006 |
| Able Air Conditioning Ltd | Other services | 2024 |
| Able Properties 2025 Ltd | Real estate | 2025 |
| ABP 2025 Ltd | Wholesale & retail | 2025 |
| Acojonesuk Ltd | Other services | 2025 |
| Acutabove Hair Salon Limited | Other services | 2010 |
| Adam Sheedy Limited | Construction | 2019 |
| Adds Resourcing Limited | Professional & scientific | 2016 |
| Advanced Maintenance Solutions Limited | Professional & scientific | 2001 |
| Advantage Voice Limited | Wholesale & retail | 2015 |
| Afidale Limited | Construction | 2003 |
| Afon Technology Ltd | Professional & scientific | 2015 |
| AFRICA1 | Health & social care | 2005 |
| Airstream C & T Limited | Administrative & support | 2003 |
| AJ Ayles Property Ltd | Real estate | 2023 |
| AK Fire and Security Solutions Limited | Administrative & support | 2022 |
| AK Inspection Services Ltd | Professional & scientific | 2024 |
| Akol Limited | Hospitality | 2019 |
| Alderdice Project Management Ltd | Construction | 2025 |
| Alex Thomas Consulting Limited | Information & communication | 2011 |
| Alja Holdings Limited | Financial services | 2026 |
| ALL41PROPERTIES Limited | Real estate | 2018 |
| Alphabet Playgroup Limited | Education | 2019 |
| ALS Trading Limited | Wholesale & retail | 2013 |
| ALU Pro (South Wales) Limited | Manufacturing | 2016 |
| Amazing Bargains Ltd | Wholesale & retail | 2019 |
| AMO Mangement Ltd | Hospitality | 2022 |
| Anderson&Co Ltd | Wholesale & retail | 2025 |
| Anne's Records and Picture House Ltd. | Information & communication | 2020 |
| Apndt Limited | Professional & scientific | 2014 |
| Apple Camping Ltd | Wholesale & retail | 2002 |
| Appletree (2) Ltd | Health & social care | 2015 |
| April Property Ltd | Real estate | 2020 |
| Aquadose Limited | Professional & scientific | 2016 |
| Arae Foundry Ltd | Wholesale & retail | 2022 |
| Arbculture Ltd | Agriculture & fishing | 2022 |
| ARC Project Management Services Ltd | Construction | 2025 |
| Arcadia Property Services Limited | Construction | 2021 |
| Archbishop Rowan Williams After School Club | Education | 2008 |
| Archistruct Konsiliom Ltd | Professional & scientific | 2018 |
| Ashgrove Groundworks Ltd | Construction | 2003 |
| Ashgrove Partnership Homes Ltd | Construction | 2004 |
| Aspire Recruitment Services Ltd | Administrative & support | 2020 |
| Assess Your Fire Risks Ltd | Health & social care | 2015 |
| Athelstan Park Owners Management Company Limited | Households | 2017 |
| Athena TCS Ltd | Information & communication | 2016 |
| Atwill Stone Company Limited | Construction | 2011 |
| Auto Covers Ltd | Wholesale & retail | 2021 |
| Auto Motorhomes Limited | Wholesale & retail | 2011 |
| AV Window and Door Group Limited | Manufacturing | 2026 |
| Avarla Living Limited | Real estate | 2016 |
| Averys Decorators Limited | Construction | 2013 |
| Aviate Services Ltd | Manufacturing | 2019 |
| Aviation Consultancy & Training Ltd | Professional & scientific | 2021 |
| Aydon Consultants Limited | Transport & logistics | 1998 |
| B W Rees & SON (1925) Limited | Construction | 2017 |
| B.A. Welding Services Limited | Professional & scientific | 2019 |
| B.C.E.(Distributors) Limited | Wholesale & retail | 1975 |
| B.J.W. Construction Ltd | Construction | 2023 |
| Babi BW Ltd | Manufacturing | 2014 |
| Baladabadi Lets Ltd | Households | 2023 |
| Banoffeesoft Limited | Information & communication | 2013 |
| Barecroft Property Limited | Real estate | 2024 |
| Bargain Hunt Caldicot Ltd | Wholesale & retail | 2026 |
| Basic Design Consultants Limited | Professional & scientific | 2001 |
| BDS Logistics (South Wales) Limited | Administrative & support | 2004 |
| Beacon Estates (Chepstow) Ltd. | Real estate | 1993 |
| Beacon Estates Developments Limited | Construction | 2019 |
| Beacon Estates Properties Limited | Financial services | 2021 |
| Bearing 361 Limited | Construction | 2020 |
| Beat'Em UP Films Limited | Information & communication | 2014 |
| Beaufort Park Lisvane Limited | Households | 2022 |
| Behind the Scenes Holdings Ltd | Real estate | 2025 |
| Benjf Limited | Manufacturing | 2019 |
| Benkiebox Ltd | Real estate | 2019 |
| Bento Films Limited | Information & communication | 2017 |
| Berdica Ltd | Hospitality | 2025 |
| Bergsmith Accountancy Services Ltd | Professional & scientific | 2018 |
| Bernardo Ltd | Health & social care | 2015 |
| Bethany Home Ltd | Health & social care | 2016 |
| Bethany Rentals Limited | Real estate | 2024 |
| Betty Staffords Care Ltd | Health & social care | 2026 |