| Ashton Butler Limited | Litlington | 2016 |
| Ashton Construction Cirencester Limited | Cirencester | 1982 |
| Ashton Dynamics Ltd | Harrogate | 2023 |
| Ashton Ebbutt Holdings Limited | Sutton Coldfield | 1965 |
| Ashton Hamilton Limited | Harrogate | 2025 |
| Ashton Leisure (Glasgow) Limited | Glasgow | 1981 |
| Ashton Memorials Limited | Sutton Coldfield | 1973 |
| Ashton Self Store Limited | Ashton-Under-Lyne | 2011 |
| Ashton Tools Limited | Derby | 2016 |
| Ashtons (Brighton) Limited | Sutton Coldfield | 1944 |
| Ashtree House (York) Management Company Limited | York | 2008 |
| Ashtree Meadows Management Company Limited | Christchurch | 2003 |
| Ashurst (Croydon) Ltd | Croydon | 2018 |
| Ashvale Ltd | Enfield | 2005 |
| Ashvale Services Limited | Retford | 2016 |
| Ashvine Management Ltd | Coventry | 2015 |
| Ashwater Barton Management Company Limited | Exeter | 1999 |
| Ashway Engineering Limited | London | 1987 |
| Ashway Properties Ltd | Lancashire | 2000 |
| Ashwick Projects Limited | 54 New Bridge Street West | 2012 |
| Ashwill Engineering Limited | Derby | 2012 |
| Ashwinds Ltd | Leatherhead | 2023 |
| ASI Accountancy and Tax Services Ltd | Bolton | 2022 |
| ASI Security Ltd | Castleford | 2014 |
| Asia MAX Well Industry Limited | Manchester | 2018 |
| Asia Medical Skin-Care Group Co., Ltd | London | 2011 |
| Asia Pacific Chemicals Co., Ltd | Cambridge | 2011 |
| Asia Pacific Ocean Group Co., Ltd | Stafford | 2016 |
| Asia Seafood Group Ltd | Stafford | 2016 |
| Asia Trade Partners Ltd | Coventry | 2019 |
| Asia Yachting Ltd | London | 2021 |
| Asia's European Car Parts Supermarket Limited | Swansea | 2013 |
| Asian Care UK Limited | Manchester | 2002 |
| Asian Curry Club Limited | Wallington | 2013 |
| Asian Links Limited | London | 2018 |
| Asian Visionary Partners Co., Ltd | Beckenham | 2014 |
| Asians Delicatesses Limited | London | 2020 |
| Asiapac Consultants (UK) Ltd | Stroud | 2011 |
| Asiawing Corporation Limited | Manchester | 2016 |
| Asidua Holdings Limited | Belfast | 2007 |
| Asier Gruber Ltd | London | 2023 |
| Asif a Services Ltd | Bournemouth | 2017 |
| Asili Ilisa Ltd. | Bracknell | 2025 |
| Asis Tobe Consultancy Limited | London | 2015 |
| ASK (Rany) Properties Ltd | Ashford | 2018 |
| ASK a Lender Limited | Ferndown | 2012 |
| ASK Computers Limited | Bolton | 2007 |
| ASK Construction (Nottingham) Limited | Nottingham | 2013 |
| ASK Emma Digital Accountants Ltd | Colwyn Bay | 2016 |
| ASK Investment Management Ltd | Coventry | 2013 |
| ASK Marine Ltd | Bromley | 2025 |
| ASK MRS Watson Limited | Whitley Bay | 2015 |
| ASK My Architect Limited | Cardiff | 2012 |
| ASK Pharmaceuticals Limited | | 2000 |
| ASK Physio Ltd | Bristol | 2013 |
| ASK Realty Limited | Birmingham | 2021 |
| ASK Seymour Limited | Henley On Thames | 2006 |
| ASK Tenants Limited | London | 2014 |
| ASK Yachting Ltd | London | 2025 |
| ASK4 Integrated Services Limited | Sheffield | 2019 |
| Askam Pier Limited | Barrow-In-Furness | 2024 |
| Askand Group Limited | Ascot | 2007 |
| Askbus Ltd | Buckinghamshire | 2014 |
| Askerlogopeden Limited | London | 2011 |
| Askew Associates Limited | Reading | 2009 |
| Askew Holdings Limited | Colne | 2017 |
| Askews Limited | Middlesbrough | 2005 |
| Askh for Motors Ltd | Northampton | 2015 |
| Askham OIL Supplies Limited | Warrington | 1959 |
| Askjak Limited | Liverpool | 2009 |
| Askmtl Ltd | London | 2017 |
| Askpinpoint Limited | Newport Pagnell | 2020 |
| Askwxm Ltd | Wrexham | 2025 |
| ASL at Home Ltd | London | 2022 |
| ASL Buckie Ltd | Buckie | 2015 |
| ASL Consulting Ltd | Exeter | 2011 |
| Aslams Limited | Glasgow | 2007 |
| Aslet Ltd | Sharrow Vale Road Sheffield | 2001 |
| Asling Investment Ltd | Wallington | 2010 |
| ASM Company Secretaries Limited | Stanmore | 2002 |
| ASM Events Ltd | Manchester | 2022 |
| ASM Skip Hire Limited | Beaconsfield | 2003 |
| ASM Waste Services Limited | Beaconsfield | 2003 |
| Asmag UK Limited | Bishop Auckland | 2008 |
| Asman Yachting Limited | London | 2024 |
| ASN Doors Limited | Bingley | 2012 |
| ASN High Tech Limited | Beckenham | 2022 |
| ASN Partnership Ltd | Ilford | 2017 |
| ASN UK Ltd | Ilford | 2025 |
| ASO Property Services (UK) Limited | Biggleswade | 1993 |
| Asoftake Co., Ltd | Beckenham | 2015 |
| Asomx Technology Co., Ltd | Cambridge | 2018 |
| ASP Catering Ltd | Bolton | 2018 |
| ASP Leisure Ltd | Darwen | 2020 |
| ASP Response Ltd | Great Thurlow | 2025 |
| ASP Risktec Ltd | Hounslow | 2014 |
| Aspara Consulting Limited | London | 2016 |
| Aspars Yachting Ltd | London | 2025 |
| Aspec Interiors Ltd | London | 2016 |
| Aspect Court Ltd | London | 2004 |