| Agenuk Limited | Fleet | 2020 |
| Agenzia Recruitment Ltd | Swynnerton | 2019 |
| Ageofedirect Limited | Warwickshire | 1989 |
| Ageproductionsuk Ltd | Basildon | 2021 |
| Ager Enterprise Ltd | Burnham-On-Sea | 2025 |
| Agera Associates Ltd | Newark | 2019 |
| Agera Capital Ltd | Cardiff | 2021 |
| Agere International Ltd | Congleton | 2007 |
| Agerion Limited | London | 2026 |
| Ages (UK) Ltd | Farnham | 2009 |
| Agesco London Ltd | London | 2014 |
| Agestage Limited | London | 2000 |
| AGF Business Services Ltd | Windermere, Windermere | 1997 |
| AGF Consultancy Ltd | Epsom | 2021 |
| AGF Consulting Ltd | Burwell | 2017 |
| AGF Media Limited | Colyton | 2025 |
| AGF Ventures 3 Limited | Nantwich | 2025 |
| Agfa Focus Advisory Ltd | Leigh-On-Sea | 2025 |
| Agfe Group Limited | London | 2007 |
| Agfe Management Limited | London | 2007 |
| Agfec Consulting Ltd | Ely | 2021 |
| Agfora Ltd | Winchester | 2015 |
| Agfran Ltd | Crosby | 2017 |
| AGG Accounting Ltd | London | 2018 |
| AGG Business Solutions Ltd | Driffield | 2025 |
| AGG Care Consultancy Ltd | Wakefield | 2026 |
| AGG Planning Associates Limited | Taunton | 2009 |
| AGG Property Limited | Bristol | 2012 |
| Agga Limited | Impington | 2015 |
| Agga Services Limited | London | 2017 |
| Aggai Ltd | Craigavon | 2025 |
| Aggarwal Accounts Limited | Coventry | 2021 |
| Aggarwal and Co (Accountants) Ltd. | Coventry | 2002 |
| Aggarwal Business Solutions Limited | Glasgow | 2010 |
| Aggio Partners Limited | Woking | 2005 |
| Aggiosergeant Limited | Woking | 2007 |
| Aggletree Holdings Limited | Skipton | 2021 |
| Agglish Limited | London | 2022 |
| Aggrandize Limited | Bromley | 2016 |
| Aggregate Bagging Company Limited | Hannington | 2004 |
| Aggregate Commercial Limited | Chorley | 2026 |
| Aggregate Communications Ltd | Brighton | 2016 |
| Aggregate Consultancy Ltd | Brent | 2026 |
| Aggregate Industries (England) Limited | Coalville | 1932 |
| Aggregate Industries Management Limited | Coalville | 1966 |
| Aggregate Industries South West Limited | Coalville | 1959 |
| Aggregate Production Consulting Limited | Lanark | 2024 |
| Aggregate Recycling Consultants Ltd | Dungannon | 2023 |
| Aggregate Sports Limited | London | 2021 |
| Aggregate Technology Holdings Limited | Laurcekirk | 2025 |
| Aggregated Carbon Offset Research Network Ltd | Stoke-On-Trent | 2024 |
| Aggregates & Equipment Limited | Hope Street | 1987 |
| Aggregatis Healthcare Ltd | London | 2023 |
| Aggregatis Limited | London | 2022 |
| Aggregators UK Limited | Norwich | 2011 |
| Aggreko Events Services Limited | Glasgow | 2017 |
| Aggreko Generators Limited | Glasgow | 1981 |
| Aggreko Holdings Limited | Glasgow | 1981 |
| Aggreko International Projects Holdings Limited | Glasgow | 2011 |
| Aggreko Luxembourg Holdings | Glasgow | 2004 |
| Aggreko Pension Scheme Trustee Limited | Glasgow | 2008 |
| Aggreko RAY SA Limited | Cannock | 2023 |
| Aggreko RAY UK Limited | Cannock | 2023 |
| Aggreko Russia Finance Limited | Glasgow | 2016 |
| Aggreko UK Finance Limited | Glasgow | 2016 |
| Aggresive Enterprise Co., Limited | London | 2012 |
| Aggress Ltd | London | 2015 |
| Aggressive Limited | Sheffield | 2013 |
| Aggrey & Associates Ltd | Liverpool | 2023 |
| Aggriwave Ltd | Sutton Coldfield | 2024 |
| Aggro Design Limited | Newcastle Upon Tyne | 2003 |
| Aggs Hill Limited | Cheltenham | 2001 |
| AGH & Associates Ltd | St. Austell | 2022 |
| AGH Bioconsulting Ltd | Sandbach | 2023 |
| AGH Capital Ltd | Harpenden | 2023 |
| AGH Commercial Consultants Limited | London | 2009 |
| AGH Consultancy Ltd | Barnoldswick | 2025 |
| AGH Consulting Limited | Harrogate | 2023 |
| AGH Contracting Limited | Aberdeenshire | 2006 |
| AGH Design & Media Ltd | Daventry | 2020 |
| AGH Design Limited | Glasgow | 2013 |
| AGH Engineering Ltd | York | 2006 |
| AGH Interiors Limited | Lincoln | 2017 |
| AGH Partners UK Ltd | Potters Bar | 2025 |
| AGH Resourcing Limited | Bedford | 2003 |
| Aghababian & Co Ltd | London | 2026 |
| Aghadowey Dairy Farmers Ltd | Coleraine | 2003 |
| Aghafad Limited | Belfast | 2016 |
| Aghaji Vision Ltd | London | 2025 |
| Aghalfo Ltd | London | 2024 |
| Aghareany Limited | Dungannon | 2006 |
| Aghastya Ltd | Basildon | 2025 |
| Aghattour Legal Ltd | London | 2026 |
| Aghaty Limited | London | 2025 |
| Aghera & Co Limited | Peterborough | 2017 |
| Aghoco 1063 Limited | London | 2011 |
| Aghoco 1085 Limited | Crook | 2012 |
| Aghoco 1566 (Bidco) Limited | Nottingham | 2017 |
| Aghoco 1578 (Midco) Limited | Nottingham | 2017 |
| Aghoco 1579 (Topco) Limited | Nottingham | 2017 |