| A M Jackson Ltd | Harrow | 2012 |
| A M James Consulting Ltd | London | 2021 |
| A M Kenworthy Limited | Macclesfield | 2002 |
| A M L C E Services Limited | Derby | 2017 |
| A M Lane Limited | Cullompton | 2005 |
| A M Livesey Consultancy Services Ltd | Preston | 2024 |
| A M M Ltd. | Maidenhead | 1998 |
| A M Malpass Limited | Shrewsbury | 2000 |
| A M Management Consultants Limited | Barnet | 1999 |
| A M Mill Studio Ltd | London | 2020 |
| A M Morgan Investments Limited | St Asaph | 2026 |
| A M Nicholson Limited | Wrotham Heath | 2024 |
| A M P Accountants Ltd | London | 2026 |
| A M P Wealth Management Ltd | Ashtead | 2022 |
| A M Pascall and Co Ltd | Rugeley | 2015 |
| A M Payroll & Salary Ltd | Manchester | 2025 |
| A M Pendleton Limited | Moreton In Marsh | 2025 |
| A M Phillips Education Law Limited | London | 2021 |
| A M Popescu Accountancy Ltd | Edgware | 2014 |
| A M Q Ltd | Brighton | 1999 |
| A M R a Cost Management Limited | Halstead | 1999 |
| A M R Surveyors Limited | Elstree | 2014 |
| A M Richards Services Limited | Port Talbot | 2023 |
| A M Road Markin.Gs Limited | Great Yarmouth | 2010 |
| A M S Fashions Limited | Markfield | 1989 |
| A M S General Services Ltd | Liverpool | 2021 |
| A M Safety Services Limited | Driffield | 2013 |
| A M Services (Yorkshire) Limited | East Yorkshire | 2006 |
| A M Sherman & Co Limited | Leeds | 2010 |
| A M SIG Limited | Darvel | 2023 |
| A M Tax Investigations Limited | London | 2019 |
| A M Tax Services Limited | Guildford | 2011 |
| A M Templewood Limited | London | 2020 |
| A M UK Solutions Ltd | Middlesbrough | 2019 |
| A M Watts Ltd | Sutton Coldfield | 2012 |
| A M Wyatt & Co Limited | Deeside | 2020 |
| A Maclean Construction Management Limited | Stowmarket | 2017 |
| A Macleod Consulting Limited | Altrincham | 2014 |
| A Macnab Limited | Guildford | 2013 |
| A Macpherson & Co Limited | Plymouth | 2020 |
| A Mahmood Holdings Limited | Nottingham | 2023 |
| A Maisuria Limited | Stroud | 2023 |
| A MAN & a PEN Limited | London | 2022 |
| A Manning (Engineering Waiver) Limited | Oxon | 1987 |
| A Manthorpe Limited | Sheffield | 2021 |
| A Manu Consultancy Ltd | Sutton Coldfield | 2015 |
| A Maqbool & Co Limited | London | 2005 |
| A Marked Difference Ltd | Aylesbury | 2010 |
| A Marketing Agency Ltd | London | 2010 |
| A Marketing Genius Limited | London | 2018 |
| A Marr & Associates Limited | London | 2013 |
| A Marriott Consultant Ltd | Market Harborough | 2024 |
| A Marsh Engineering Ltd | Marlow | 2026 |
| A Mattack Consulting Ltd | Southampton | 2017 |
| A Matter of Trust Limited | Glasgow | 2025 |
| A MAY Accounting Limited | Aylesford | 2014 |
| A Mccabe Ltd | Middlesbrough | 2025 |
| A Mccandlish Agricultural Contractors Ltd | Ayr | 2013 |
| A Mccartie Engineering Limited | Warrington | 2016 |
| A Mccrory & Co Ltd | Dungannon | 2022 |
| A Mcginley & Associates Ltd | Glasgow | 2013 |
| A Mcguinness Consultancy Ltd | Newry | 2025 |
| A Mcguinness Copy Ltd | London | 2015 |
| A Mcintyre Consulting Ltd | Welton | 2024 |
| A MCK Limited | Tonbridge | 2003 |
| A Mckeown Ltd | Birmingham | 2018 |
| A Mclean & Co (N.I.) Ltd | Carrickfergus | 2024 |
| A Mcnulty Real Estate Limited | Hyde | 2025 |
| A Mcquillan Inspection Ltd | Lochgelly | 2012 |
| A Mcveigh Consultancy Ltd | Maldon | 2019 |
| A Mcveigh Consulting Ltd | Maldon | 2025 |
| A Meachem Associates Ltd | Dunstable | 2022 |
| A Meacher Ltd | Hemel Hempstead | 2020 |
| A Media Studio Ltd | Southall | 2025 |
| A Medley Risk Consultancy Ltd | Winchester | 2015 |
| A Megeed Limited | Bromley | 2024 |
| A Mehta Consultants Ltd | Bexleyheath | 2023 |
| A Mehta Ltd | Leicester | 2017 |
| A Melia Property Limited | Hull | 2017 |
| A Melton Ltd | Pickering | 2023 |
| A Meredith Power Risk Engineering Limited | Andover | 2021 |
| A Mhor Bheinn Ltd | Alford | 2024 |
| A Middleton Consultancy Ltd | Wakefield | 2025 |
| A Miles Commercial Services Ltd | Stockport | 2022 |
| A Milford Ltd | Milton Keynes | 2025 |
| A Millar Consulting Ltd | London | 2009 |
| A Million ADS Holdings Limited | London | 2015 |
| A Million ADS Limited | London | 2016 |
| A Milner Consultancy Services Limited | Totnes | 2023 |
| A Mind of Figures Ltd | Horbury | 2017 |
| A Mirza Consultant Ltd | Birmingham | 2020 |
| A Mitchell Engineering Ltd | Hereford | 2020 |
| A Mobile Studio Limited | Billericay | 2010 |
| A Modern Practice Limited | Billericay | 2016 |
| A Mohamed Ltd | Pinner | 2019 |
| A Moment in Time Photo Booths Ltd | Downpatrick | 2025 |
| A Moment's Inspiration Ltd | Blackpool | 2016 |
| A Morgan & Co Limited | Swansea | 2004 |
| A Morgan Consultancy Services Limited | Newcastle Upon Tyne | 2026 |
| A Morgan Services Limited | Wellingborough | 2017 |