| Abys Consulting Limited | Leeds | 2015 |
| Abysis Limited | North Yorkshire | 2024 |
| Abyss Global Ltd | St. Albans | 2012 |
| Abyss Holdings Ltd | Hayes | 2020 |
| Abyss Marketing Limited | Leeds | 2014 |
| Abyss Subsea Ltd | Rotherham | 2026 |
| Abyssinia International Consulting (AIC) Ltd | Birmingham | 2020 |
| Abyssinia Ltd | Southampton | 2012 |
| Abyssusnet Limited | Harrow | 2025 |
| Abyt Group Ltd | Bedford | 2026 |
| Abyus Ltd | Ashford | 2022 |
| ABZ Accounts Limited | Aberdeen | 2019 |
| ABZ Business Consultant Ltd | Nottingham | 2025 |
| ABZ Consultancy Ltd | Winchester | 2014 |
| ABZ Consultants Ltd | London | 2024 |
| ABZ Consulting Services Ltd | Aberdeen | 2014 |
| ABZ Cost Ltd | Cheltenham | 2024 |
| ABZ Engineering Ltd. | Aberdeen | 2016 |
| ABZ Engineering Services Ltd | Edinburgh | 2025 |
| ABZ Growth Specialists Ltd | Harrow | 2026 |
| ABZ Jalil Ltd | Birmingham | 2016 |
| ABZ PAT Testing Ltd | Aberdeen | 2025 |
| ABZ Pro Scot Ltd | Edinburgh | 2019 |
| ABZ Projects Ltd | Aberdeen | 2024 |
| ABZ Solutions Ltd | Dyce | 2013 |
| Abzac Architecture Ltd | St. Asaph | 2014 |
| Abzag Ltd | Norwich | 2013 |
| Abze 1 Limited | London | 2023 |
| Abzena (Cambridge) Limited | Cambridge | 2004 |
| Abzena (UK) Limited | Cambridge | 2001 |
| Abzena Limited | Cambridge | 2014 |
| Abzolute Limited | Maidstone | 2012 |
| Abzorb Media Limited | Quorn | 2020 |
| Abzyma Ltd | Pentraeth | 2025 |
| Abzyme Ltd | London | 2025 |
| Abzz Limited | Liverpool | 2019 |
| AC & M Solutions Ltd | Lymm | 2024 |
| AC (Penkridge) Limited | Stafford | 2015 |
| AC - QC Ltd | Bolton | 2013 |
| AC / BC Design & Build Services Ltd | Swindon | 2021 |
| AC ACC Limited | Hornchurch | 2023 |
| AC Accountancy & Consultancy Limited | Rhyl | 2023 |
| AC Accountancy Group Limited | Leigh-On-Sea | 2024 |
| AC Accountancy Ltd | St. Neots | 2015 |
| AC Accountancy Services (UK) Limited | Bolton | 2013 |
| AC Accountants Limited | London | 2014 |
| AC Accounting and Consulting Limited | Cardiff | 2021 |
| AC Accounting Limited | Buckfastleigh | 2008 |
| AC Accounting Services Ltd | Southgate | 2019 |
| AC Accounting Support Ltd | Stevenage | 2018 |
| AC Advisory Ltd | Nottingham | 2026 |
| AC Aerial Photography and Surveys Limited | Marston Moretaine | 2020 |
| AC Aerotech Ltd | Fareham | 2022 |
| AC Applications Limited | Colchester | 2023 |
| AC Aquaculture Consulting Limited | London | 2026 |
| AC Archaeology and Heritage Ltd | Exeter | 2008 |
| AC Architects Cambridge Limited | Cambridgeshire | 2000 |
| AC Architecture Ltd | London | 2022 |
| AC Associates UK Limited | Garswood Nr Wigan | 2000 |
| AC Automotive Engineering Ltd | Much Wenlock | 2014 |
| AC Brittain Ltd | Swaffham | 2012 |
| AC Bronwin Ltd | Powys | 2020 |
| AC Burton Consultants Limited | London | 2020 |
| AC Business Consulting Limited | Birmingham | 2019 |
| AC Business Continuity Limited | Harrow | 2018 |
| AC Business Management Limited | Hambrook | 2024 |
| AC CAD Ltd | Birmingham | 2018 |
| AC Capital Group Ltd | Manchester | 2020 |
| AC Capital Ltd | London | 2010 |
| AC Car Group Limited | Derby | 2007 |
| AC Career Services Ltd | Epping | 2019 |
| AC Cars Limited | Derby | 2004 |
| AC Cars Manufacturing Ltd | Derby | 2007 |
| AC Change Associates Limited | London | 2018 |
| AC Chelmsford Ltd | Laindon | 2021 |
| AC Clinical Development Ltd | London | 2025 |
| AC CLU Capital Ltd | Rugby | 2024 |
| AC Commerce Ltd | London | 2024 |
| AC Construction & Consultants Ltd | Milton Keynes | 2025 |
| AC Construction & Safety Services Ltd | Newark | 2018 |
| AC Consult Ltd | Rumney | 2012 |
| AC Consultancy & Solutions Ltd | Eastleigh | 2025 |
| AC Consulting & Advisory Ltd | Welling | 2026 |
| AC Consulting Midlands Ltd | Wolverhampton, Staffordshire | 2025 |
| AC Contracting & Tutoring Limited | Cardiff | 2019 |
| AC Contracting Solutions Ltd | Bradford | 2026 |
| AC Corporate Communications Limited | Bromley | 2015 |
| AC Corporate Holding Limited | Wakefield | 2014 |
| AC Cost Consultancy Ltd | Cleethorpes | 2021 |
| AC Counts & Services Ltd | Redditch | 2012 |
| AC Creative Communications Limited | Altrincham | 2025 |
| AC Creative Nottingham Ltd | Bingham | 2021 |
| AC Data Compliance Ltd | Liverpool | 2021 |
| AC Design Solutions Ltd | Uxbridge | 2012 |
| AC Developments (Ipswich) Limited | Stutton | 1990 |
| AC Digital Media Service Ltd | Dundee | 2022 |
| AC Drafting Ltd | Redhill | 2013 |
| AC Dust & Vent Ltd | Manchester | 2026 |
| AC Earthing Consultancy Ltd | Ilkeston | 2022 |
| AC Education (Holdings) Limited | Bootle | 2013 |