| AB15 Consultants Ltd | Dundee | 2024 |
| AB17 Electronic Design Limited | Dunfermline | 2016 |
| AB25 Consultancy Ltd | Poole | 2025 |
| AB3 Architects Ltd | London | 2019 |
| AB360 Solutions Ltd | Birmingham | 2022 |
| AB43 Solutions Ltd | Fraserburgh | 2016 |
| AB5 Consulting Ltd | Hayes | 2014 |
| AB5 Social Limited | Belfast | 2026 |
| AB6 Ltd | Falkirk | 2023 |
| AB616 Ltd | London | 2022 |
| AB7 Consulting Ltd | Kingston Upon Thames | 2023 |
| AB700 Ltd | Liverpool | 2012 |
| AB77 Ltd | Manchester | 2018 |
| AB80 Ltd | Bristol | 2026 |
| AB82 Limited | Stockport | 2012 |
| ABA Associates (GB) Ltd | Ilford | 2010 |
| ABA Consultancy Limited | London | 2009 |
| ABA Consultants Ltd | London | 2019 |
| ABA Consulting Ltd | Manchester | 2023 |
| ABA Creators Ltd | 2 The Crest | 2021 |
| ABA Defence Solicitors Ltd | Croydon | 2025 |
| ABA Drafting and Modelling Services Ltd | Enfield | 2022 |
| ABA Global Holdings Ltd | Sheffield | 2018 |
| ABA Market Research Limited | St Albans | 2002 |
| ABA Park Lane Services Limited | Fareham | 2012 |
| ABA Procurement Ltd | Norwich | 2012 |
| ABA Professional Services Network Ltd | Ruislip | 2021 |
| ABA Quality Monitoring Ltd | Heaton Mersey | 1995 |
| ABA Services (Accurate Books and Accounts) | Clydebank | 2016 |
| ABA Solicitors Ltd | London | 2023 |
| ABA Surveyors Ltd | Middx | 2006 |
| ABA Wealth Solutions Limited | Leighton Buzzard | 2019 |
| Aba-Sheikh Consulting Limited | London | 2024 |
| Abaancart Ltd | Ilford | 2025 |
| Abaar Property and Development Limited | Wirral | 1963 |
| Abaare Associates Ltd | London | 2024 |
| Abab Ltd | Wokingham | 2026 |
| Ababa Limited | Coventry | 2015 |
| Ababbyre Ltd | Bury St Edmunds | 2025 |
| Ababex Limited | Gloucester | 1987 |
| Abac Center of Excellence Limited | London | 2017 |
| Abac Consulting Limited | Bexhill | 2005 |
| Abaca Solutions Limited | High Peak | 2017 |
| Abacab Consulting Limited | London | 2025 |
| Abacab Two Limited | Edinburgh | 2001 |
| Abacad Limited | Sutton Coldfield | 2005 |
| Abacai Ltd | London | 2018 |
| Abacaii Ltd | Leicester | 2014 |
| Abacalc Limited | South Croydon | 2015 |
| Abacare Services Limited | Nottingham | 2019 |
| Abacaxi Consulting Limited | St. Albans | 2019 |
| Abacco Limited | Bolton | 2015 |
| Abaccus Accountancy Limited | Choppington | 2001 |
| Abaci Consulting Limited | Waterlooville | 2013 |
| Abaci Payments Ltd | London | 2013 |
| Abaci Piping Ltd | Glasgow | 2026 |
| Abacium Group Ltd | London | 2025 |
| Abaco A.M. Limited | London | 2016 |
| Abaco Consulting Ltd | London | 2022 |
| Abaco UK Holdco Limited | Leicester | 2016 |
| Abacot Engineering & Consultancy Ltd | Medstread | 2024 |
| ABACU5 Ltd | Birmingham | 2023 |
| Abacus & Azure Ltd | London | 2014 |
| Abacus (DP) Limited | Hertfordshire | 1976 |
| Abacus (NW) Limited | Wirral | 2017 |
| Abacus 114 Limited | Grantham | 2008 |
| Abacus 152 Limited | Leeds | 2007 |
| Abacus 155 Limited | Ripon | 2006 |
| Abacus 164 Limited | Wallsend | 2006 |
| Abacus 196 Limited | Hebburn | 2005 |
| Abacus 2 Limited | Kings Langley | 2013 |
| Abacus 246 Limited | Hertfordshire | 2004 |
| Abacus 360 Limited | Sevenoaks | 2023 |
| Abacus 365 Solutions Limited | Hartlepool | 2018 |
| Abacus 369 Limited | Wreakes Lane | 2005 |
| Abacus 42 Limited | Alton | 2007 |
| Abacus 449 Limited | Morpeth | 2004 |
| Abacus 46 Limited | Slough | 2007 |
| Abacus 460 Limited | Hebburn | 2004 |
| Abacus 5 Limited | Coventry | 2018 |
| Abacus 59 Limited | Romford | 2009 |
| Abacus 70 Limited | Bicester | 2006 |
| Abacus A.S. Limited | Lincoln | 2012 |
| Abacus Account Solutions Ltd | London | 2025 |
| Abacus Accountancy & Bookkeeping Limited | Dalkeith | 2006 |
| Abacus Accountancy & Consultancy Services Limited | Sheffield | 2018 |
| Abacus Accountancy & Taxation Services Ltd | Nottingham | 2010 |
| Abacus Accountancy (Cornwall) Limited | St Minver Wadebridge | 2002 |
| Abacus Accountancy (Essex) Ltd | Wickford | 2002 |
| Abacus Accountancy (LDN) Ltd | London | 2009 |
| Abacus Accountancy and Payroll Services Limited | Epsom | 2008 |
| Abacus Accountancy Group Limited | Braintree | 2018 |
| Abacus Accountancy London Limited | Whyteleafe | 2012 |
| Abacus Accountancy Service & Systems Ltd | Selby | 2010 |
| Abacus Accountancy Services (East Anglia) Ltd | Downham Market | 2010 |
| Abacus Accountancy Services Limited | Middlesex | 1989 |
| Abacus Accountancy Support Ltd | Birmingham | 2006 |
| Abacus Accountancy UK Ltd | London | 2007 |
| Abacus Accountants & Associates Ltd | Coventry | 2010 |
| Abacus Accountants Halifax Ltd | Halifax | 2019 |