| 10B Property Ltd | Construction | 2019 |
| 12 Knights CIC | Information & communication | 2025 |
| 123TELECOM Limited | Information & communication | 2003 |
| 1314 Broad Street Ltd | Construction | 2024 |
| 21 Romilly Road Management Ltd | Administrative & support | 2017 |
| 22 Romilly Road Barry (Freehold) Company Limited | Households | 2022 |
| 32 Redbrink Crescent Management Co Limited | Households | 2005 |
| 360 Entertainment Limited | Professional & scientific | 2006 |
| 3D Deseng Ltd | Construction | 2008 |
| 68 Redbrink Management Co Ltd | Households | 2009 |
| 70 Stanwell Limited | Real estate | 2001 |
| 8C Financial Services Ltd | Financial services | 2016 |
| 93 Renovations Limited | Real estate | 2024 |
| 95PR Management Company Ltd | Households | 2025 |
| 97WEBSITES Limited | Information & communication | 2014 |
| A & G Jones Ltd | Health & social care | 2021 |
| A and J Plastering Services Ltd | Construction | 2022 |
| A B Car Sales Limited | Wholesale & retail | 2004 |
| A B Curtis Investments Ltd | Financial services | 2025 |
| A B G Specialised Flooring & Building Maintenance Limited | Construction | 2003 |
| A B Service Centre Limited | Extraterritorial | 2011 |
| A Counsell (Cheshire) Limited | Health & social care | 2019 |
| A Lake Electrical Services Ltd | Construction | 2021 |
| A Lewis Properties Ltd | Real estate | 2025 |
| A Stars Barber Limited | Other services | 2022 |
| A&B Productions Ltd | Hospitality | 2025 |
| A.C Property Rentals Ltd | Real estate | 2025 |
| A.E Dental Laboratory Ltd | Manufacturing | 2026 |
| A.P.C. Panels Ltd. | Manufacturing | 1993 |
| A.S.M Welders Ltd | Manufacturing | 2018 |
| A1 Height Safety Ltd | Professional & scientific | 2015 |
| A2Z Rentals Limited | Administrative & support | 2022 |
| A2Z Taxi Vale of Glamorgan Ltd | Transport & logistics | 2021 |
| A3 Catering Limited | Hospitality | 2025 |
| A48 Theatre Company C.I.C. | Education | 2018 |
| Aariah Limited | Wholesale & retail | 2020 |
| Ab-Initial Limited | Administrative & support | 2025 |
| ABC Leasing Limited | Administrative & support | 2004 |
| ABC Sign & Print Ltd | Manufacturing | 2020 |
| About Training Limited | Education | 2006 |
| Academy Coffee Holdings Limited | Financial services | 2018 |
| Academy Coffee Limited | Hospitality | 2015 |
| Academy Street Body Shop Ltd | Wholesale & retail | 2013 |
| Access Business Finance and Consultancy Ltd | Financial services | 2014 |
| Acey & Co. Stays Limited | Real estate | 2025 |
| ACH Social Work Services Ltd | Health & social care | 2020 |
| Acia Limited | Real estate | 2001 |
| Adapt Installations Limited | Construction | 2026 |
| ADC Real Estate Ltd | Real estate | 2025 |
| Aden Grill Ltd | Hospitality | 2025 |
| Adenpalm Limited | Health & social care | 2020 |
| Adept Systems (UK) Limited | Administrative & support | 2014 |
| Adepta Engineering Limited | Administrative & support | 2000 |
| Adexsi UK Ltd | Construction | 2009 |
| Adhoora Ltd | Professional & scientific | 2022 |
| Adroit Controls Ltd | Manufacturing | 2014 |
| Advance Cleaning Management T/A CCS Services Limited | Administrative & support | 2013 |
| Advance Dental Care Limited | Health & social care | 2007 |
| Adventure Island Barry Island Ltd | Arts & recreation | 2024 |
| Aerodyne Aircraft Development Ltd. | Manufacturing | 2019 |
| Affinity Education Limited | Administrative & support | 2008 |
| Affluent Trading Ltd | Wholesale & retail | 2020 |
| Affordable Welsh Energy Limited | Wholesale & retail | 2024 |
| Afghanfoods Ltd | Wholesale & retail | 2025 |
| Africa Energy Partners Ltd | Professional & scientific | 2020 |
| AG Project & Event Services Ltd | Professional & scientific | 2023 |
| Ageis Ltd | Financial services | 2025 |
| Agile Property Consulting Ltd | Professional & scientific | 2020 |
| Agvp Limited | Households | 2025 |
| Ahad & Farida Ltd | Real estate | 2020 |
| AI Lane Limited | Information & communication | 2026 |
| AJ Street Subs Ltd | Hospitality | 2026 |
| Ajax Developments Limited | Real estate | 1976 |
| AJH Services Ltd | Extraterritorial | 2019 |
| Ajje Holdings Limited | Financial services | 2026 |
| AK Gill Builders Ltd | Other services | 2013 |
| AKB (Wales Bharat) Ltd | Administrative & support | 2024 |
| AKB 2014 Limited | Financial services | 2014 |
| AKB PMC Ltd | Administrative & support | 2024 |
| AL Carpentry and Glazing Ltd | Manufacturing | 2019 |
| Al-Rawi Anaesthesia Associates Ltd | Health & social care | 2013 |
| Alan Barber Shop Ltd | Other services | 2025 |
| Alan Williams and Co (Wales) Limited | Wholesale & retail | 1995 |
| Alderamin Ltd | Information & communication | 2010 |
| Alephia Limited | Information & communication | 2023 |
| Alexander Design Build Ltd | Construction | 2012 |
| Alexander House Barry Management Company Limited | Households | 2017 |
| Alima ALI Ltd | Professional & scientific | 2025 |
| ALL Clear Lifting Ltd | Construction | 2024 |
| ALL in One Landscaping Ltd | Other services | 2017 |
| ALL Stars Training Ltd | Education | 2024 |
| ALL Trendy Find Ltd | Wholesale & retail | 2025 |
| Allsafe Training Services Limited | Health & social care | 2011 |
| Allyssa Limited | Wholesale & retail | 2025 |
| Alm&Co Ltd | Professional & scientific | 2022 |
| Alpha Air Systems Ltd | Wholesale & retail | 2014 |
| Alpine Peak Limited | Real estate | 2014 |
| Alsop Property Limited | Real estate | 2021 |
| ALT Learning Limited | Education | 2020 |
| Altitude Safety Solutions Ltd | Professional & scientific | 2025 |