| Aaros Care Ltd | Withernsea | 2021 |
| Aarox Construction Limited | Belvedere | 2020 |
| Aarraa Consultants Limited | Dundee | 2016 |
| Aarrhus Developments Limited | Ascot | 2011 |
| Aars Investments Ltd | Hounslow | 2025 |
| Aartic Training Services Ltd | Swansea | 2012 |
| Aarts Adriaans Onroerend Goed Limited | Taunton | 1995 |
| Aaru Cleaning Limited | Southampton | 2025 |
| Aaru Consulting Limited | Woodford Green | 2025 |
| Aaru Travels Ltd | East Ham | 2025 |
| Aarunya Consulting Limited | Wigan | 2017 |
| Aarvee Logistics Limited | Gerrards Cross | 2022 |
| Aarvi Encon Resources Ltd | Harrow | 2018 |
| Aarya Aerotek Limited | Bristol | 2009 |
| Aarya Consultancy Limited | Nottingham | 2019 |
| Aarya Enterprises Info Ltd | Slough | 2024 |
| Aaryroam Ltd | Southampton | 2015 |
| AAS Car Hire Ltd | London | 2023 |
| AAS Care Services Limited | Barking | 2026 |
| AAS Guard Limited | London | 2024 |
| AAS Parts Ltd | Chester | 2022 |
| AAS Trading Ltd | Huddersfield | 2017 |
| Aasaka Limited | Leamington Spa | 2019 |
| Aasc Ltd | Dorking | 2018 |
| Aascom Ltd | Emsworth | 2020 |
| Aasd Services Ltd | Bradford | 2026 |
| Aasecuritas Limited | Lingfield | 2022 |
| Aasenvej Limited | Bromsgrove | 2014 |
| Aaset 2020-1 UK Limited | London | 2022 |
| Aash Travels Limited | London | 2025 |
| Aasim M Consultants Ltd | Batley | 2026 |
| AAT Cleaning Services Ltd | London | 2023 |
| AAT King's Tours (U.K.) Limited | London | 1993 |
| Aatb Limited | Luton | 2025 |
| Aatheris Travel Ltd | Tavistock | 2016 |
| Aatk Consultants Ltd | Durham | 2021 |
| Aatkins Security Services (UK) Ltd | Ashton-Under-Lyne | 2014 |
| Aatm Services Ltd | Surbiton | 2016 |
| Aatom Limited | Harrow | 2006 |
| Aatom Recruitment Ltd | Harrow | 2009 |
| Aats Angency 24/7 Ltd | Northampton | 2024 |
| Aats Health Care Ltd | Northampton | 2024 |
| AAU Business Solutions Ltd | London | 2021 |
| Aaui Ltd | Datchet | 2025 |
| Aauraa Ltd | London | 2026 |
| AAV (2006) Ltd | East Grinstead | 2006 |
| AAV Cleaning Services Limited | London | 2025 |
| AAW Administration Services Ltd | Dalkeith | 2023 |
| AAW Creative Ltd | London | 2026 |
| AAY Trades Ltd | London | 2024 |
| Aaya Limited | London | 2012 |
| Aayan Services Ltd | Ilford | 2025 |
| Aayu Senses Limited | London | 2012 |
| AAZ Aero Engine Engineering Limited | Birmingham | 2017 |
| AAZ Boutique and Fashion Ltd | Cheshire | 2020 |
| AAZ Group Limited | Belfast | 2019 |
| Aaza Rent a Car Limited | London | 2018 |
| Aazure Limited | Birmingham | 2024 |
| AB & C Cleaning Services Ltd | Edgware | 2023 |
| AB & CB Holdings Limited | Peterborough | 2020 |
| AB & Co Services Ltd | Birmingham | 2024 |
| AB 1PRESSURE Washing Ltd | St. Leonards-On-Sea | 2025 |
| AB Admin Ltd. | Preston | 2016 |
| AB Admin Services Ltd | Northolt | 2025 |
| AB Admin Solutions Ltd | Maldon | 2021 |
| AB Aesthetic Business Academy Ltd | Warrington | 2024 |
| AB Alarms Ltd | Sunbury-On-Thames | 2021 |
| AB Architects Limited | Lymm | 2016 |
| AB Automation Limited | Bracknell | 2011 |
| AB Building & Landscaping Ltd | Torquay | 2025 |
| AB Business Management Solutions Limited | Farnham | 2022 |
| AB Business Solutions Limited | Stevenage | 2011 |
| AB Capital Partners Limited | London | 2015 |
| AB Car Valeting Ltd | Aberdeen | 2022 |
| AB Castings and Management Limited | Basildon | 2013 |
| AB Chauffeurs Ltd | Slough | 2014 |
| AB Civils & Groundworks Ltd | Euxton Lane, Chorley | 2014 |
| AB Civils Design Ltd | Chesterfield | 2018 |
| AB Cleaning Ltd | Nottingham | 2017 |
| AB Cleaning Services Limited | Eastbourne | 2025 |
| AB Cleaning Solutions Limited | Uxbridge | 2025 |
| AB Clinical Research Limited | Coalville | 2005 |
| AB Commercial & Domestic Cleaning Ltd | Glasgow | 2025 |
| AB Commercial Cleaning Ltd | Nottingham | 2020 |
| AB Commercial Finance Limited | Sheffield | 2022 |
| AB Commercial HR Solutions Limited | Market Harborough | 2015 |
| AB Commercial Property Holdings Ltd | Basildon | 2018 |
| AB Compliance Limited | Southampton | 2025 |
| AB Computer Services Ltd | Thurmaston | 2016 |
| AB Construction & Landscapes Limited | Lathom | 2024 |
| AB Consultancy Limited | Dudley | 2005 |
| AB Consulting Group Ltd | Ilford | 2017 |
| AB Consulting Services (Abcs) Limited | Manchester | 2016 |
| AB Creative Live Limited | Marlow | 2017 |
| AB Design Flooring Ltd | Stroud | 2009 |
| AB Design London Ltd. | Brentwood | 2016 |
| AB Digital Consulting Ltd | Sheffield | 2025 |
| AB Dynamics PLC | Bradford On Avon | 2013 |
| AB Ecred Co-Investment Limited | London | 2023 |
| AB Ecred Management Limited | London | 2023 |