| A M Aviation Consulting Limited | Hyde | 2022 |
| A M B Stainless and NON Ferrous Limited | Sheffield | 1999 |
| A M Bespoke Heaters Limited | Wigan | 2025 |
| A M Collis Carpentry Ltd | Ipswich | 2020 |
| A M E Engineering Limited | Sutton | 1994 |
| A M Elevator Services Limited | Bristol | 2023 |
| A M Fire & Security Systems Ltd | Perth | 2003 |
| A M Gibbins Ltd | Loughborough | 2022 |
| A M Glassware Limited | Aberdeen | 2002 |
| A M Horseboxes Ltd | Wisbech | 2019 |
| A M I Exchangers Limited | Stafford | 1988 |
| A M Interiors Limited | Edinburgh | 2007 |
| A M J Electrical Services Ltd | Swansea | 2015 |
| A M J Maters Ltd | Doncaster | 2025 |
| A M Jones Carpentry Ltd | Maryport | 2024 |
| A M Labels Ltd. | Kettering | 1996 |
| A M Marine Trimming Ltd | Berkshire | 2020 |
| A M N Foam Limited | Haverhill | 2005 |
| A M P Wire Limited | Chadderton | 1998 |
| A M Perry Ltd | Lydbury North | 2023 |
| A M Power Solutions Ltd | Kidwelly | 2006 |
| A M Precision Ltd | Frome | 2015 |
| A M Refractories Ltd | Huddersfield | 2022 |
| A M S (Leicester) Limited | Leicester | 2014 |
| A M S Doors Limited | Stevenage | 2011 |
| A M Screen Printing Limited | Eaton Ford St Neots | 2004 |
| A M Services (Northern) Limited | Leeds | 2005 |
| A M Signs Limited | Hinckley | 2003 |
| A M Wilson Engineering Services Ltd | Hull | 2022 |
| A Maden Automotive Prototypes Limited | Sandbach | 2003 |
| A Maintenance Engineer Ltd | Leigh | 2026 |
| A Mark'D Improvement Ltd | Dudley | 2021 |
| A Marsden and Sons Ltd | Preston | 2024 |
| A MAY Services Limited | Norwich | 2022 |
| A Mcintyre Joinery Ltd | Paisley | 2009 |
| A Mcpherson & Co Ltd | Cupar | 2015 |
| A Mcpherson (Blacksmiths) Limited | Renfrewshire | 1984 |
| A Melleney Limited | Salisbury | 2010 |
| A Metalheads Kind of Sauce Ltd | Cambridge | 2018 |
| A Metcalfe Joinery Ltd | Rochdale | 2026 |
| A Milroy Services Ltd | Wilmslow | 2025 |
| A Moise Auto Ltd | Cambridge | 2025 |
| A Moment in Time Ltd | Newtownabbey | 2021 |
| A Moment of Silence Ltd | Romsey | 2020 |
| A Munro Aircraft Engineer Ltd | Lairg | 2025 |
| A Murphy Engineering Limited | Greenford | 2014 |
| A N E Solutions Ltd | Ballymena | 2011 |
| A N Enterprise Ltd | Manchester | 2009 |
| A N Northwest Ltd | Liverpool | 2023 |
| A N P Enterprise Ltd | London | 2019 |
| A N Wallis & Company Limited | Nottinghamshire | 2000 |
| A N Z Styles Ltd | High Wycombe | 2016 |
| A Natural Wood Designs Ltd | London | 2025 |
| A Neat Touch Studio Limited | London | 2016 |
| A Nelson & Co Limited | London | 1930 |
| A Noble Connection EV and Electrical Solutions Limited | Scarborough | 2026 |
| A Nomad’S Van Ltd | London | 2025 |
| A O Enterprises Limited | Hertfordshire | 2004 |
| A O M L Packaging Limited | Glossop | 2005 |
| A Oliver Mechanical Services Ltd | Hartlepool | 2012 |
| A One Dosa Limited | Hounslow | 2025 |
| A One Paper Limited | Leicester | 2016 |
| A One Tyres (Dromore) Ltd | Dromore | 2005 |
| A P Cargill Chrome Design Limited | Middlesbrough | 2002 |
| A P Chemicals Limited | Cheddleton | 2005 |
| A P Components Ltd | Billericay | 2022 |
| A P Contractor Services Limited | Huddersfield | 2019 |
| A P D'Eath (Electrical) Ltd | Diss | 1996 |
| A P Diesels UK Ltd | Englefield Green | 2010 |
| A P Electrics (Midlands) Limited | Kidderminster | 2012 |
| A P Electronic Services Limited | Beverley | 1997 |
| A P Fabrications Limited | Reading | 2009 |
| A P G Marine & Household Limited | Perranarworthal | 2013 |
| A P H Screens Limited | Beccles | 2005 |
| A P Hanson Ltd | Kendal | 2010 |
| A P Henman Ltd | Chesterfield | 2025 |
| A P Jess (Paisley) Ltd. | Glasgow | 1995 |
| A P Joinery & Refurbishments Ltd | Nottingham | 2014 |
| A P Landragin Limited | Hornchurch | 2015 |
| A P M G Limited | Bolton | 1939 |
| A P Marley Ltd | Romford | 2018 |
| A P Mechanical Services Limited | Smethwick | 2014 |
| A P Plastic Fabrications Ltd | Haverhill | 2012 |
| A P Refrigeration Limited | Shrewsbury | 2022 |
| A P Rowbotham Limited | Hedon | 2026 |
| A P S Printers Limited | Lincolnshire | 2004 |
| A P Smallman Maintenance Services Ltd | Solihull | 2025 |
| A P Spindle Tooling Ltd | Princes Risborough | 2022 |
| A P Tools Limited | Southampton | 2002 |
| A P V Marine Limited | Ocean Way | 2008 |
| A Pack Ltd | Wrexham | 2026 |
| A Pack Plastics Limited | Ramsgate | 2020 |
| A Parry Engineering Ltd | Barnsley | 2015 |
| A Pattern Cutter & Grader Limited | London | 2019 |
| A Peachy Creation Ltd | Wakefield | 2025 |
| A Perfect Fit Ltd | London | 2017 |
| A PIE in the Sky Cyfyngedig | Pontypool | 2024 |
| A Piece of Cake Limited | Newry | 2004 |
| A Plan Kitchens & Bedroom Furniture Limited | Norwich | 2013 |
| A Plus Double Glazing Ltd | Glasgow | 2025 |