| A Dearlove Production Limited | London | 2022 |
| A DEE KAY Joinery Limited | Birmingham | 2002 |
| A Delivery Hull Ltd | Hull | 2019 |
| A Design for ALL Ltd | Stanford-Le-Hope | 2016 |
| A Different Ball Game Limited | Waltham Abbey | 2017 |
| A Different Cloth Ltd | London | 2022 |
| A Display Graphics Limited | Guildford | 2014 |
| A Dog Person Ltd | London | 2024 |
| A Door Additions Ltd | Cardiff | 2023 |
| A Dugdale Rigging Solutions Ltd | Wallsend | 2019 |
| A Dymond Security Installations Limited | Bristol | 2008 |
| A E C Engineering Ltd | Wrexham | 2011 |
| A E Evans Ltd | Wrexham | 1985 |
| A E Groundworks Ltd | Glasgow | 2016 |
| A E Haxton Ltd | Cheam | 2017 |
| A E Oscroft & Sons Limited | Redditch | 2002 |
| A E Smith Engineering Limited | Cheltenham | 2009 |
| A E W Construction Limited | Worthing | 2021 |
| A E Williams (EST 1779) Ltd | Birmingham | 2017 |
| A Ellis Fabrications Ltd | Liversedge | 2011 |
| A Engineer Services Ltd | Coolham | 2011 |
| A F C Precision Engineering Limited | Banbury | 1984 |
| A F Carpentry and Construction Limited | Maidstone | 2024 |
| A F Construction Lincoln Ltd | Lincoln | 2024 |
| A F Energy and Contruction Limited | Aylesford | 2021 |
| A F Fabrications Limited | Nottinghamshire | 1999 |
| A F Fasteners Limited | Glossop | 1998 |
| A F Interiors (Yorkshire) Limited | Doncaster | 2017 |
| A F Metal Fabrication Limited | Lewes | 2012 |
| A F Reprographics Limited | Derby | 2012 |
| A F S Adhesives Limited | Kidderminster | 2017 |
| A F Smart Repairs Limited | London | 2011 |
| A F Steel Fabrications Ltd | Hull | 2020 |
| A F Switchgear Limited | Sutton In Ashfield | 1974 |
| A F White Manufacturers Limited | Newtownards | 2015 |
| A FAB Limited | Newton Aycliffe | 2017 |
| A Fahri Electrical Limited | London | 2018 |
| A Fawcett Precision Engineering Limited | Leeds | 1983 |
| A FEW Scoops Limited | Manchester | 2019 |
| A Flanagan Engineering Ltd | Enniskillen | 2026 |
| A Foison Sauce Ltd | London | 2024 |
| A Force London Limited | London | 2020 |
| A Force of Nurture Limited | Haverfordwest | 2022 |
| A Form Tooling Limited | Leicester | 1978 |
| A Fresh Start Ltd | Stafford | 2009 |
| A G Automation Limited | Marlborough | 2014 |
| A G Brown Fabrications Limited | Glenrothes | 2012 |
| A G Carbon Limited | Nottingham | 2015 |
| A G Cranes Limited | Redditch | 2008 |
| A G Donnan Ltd | Dunblane | 2019 |
| A G F (UK) Limited | Altrincham | 1994 |
| A G H Aviation Services Limited | Cardiff | 2026 |
| A G Major Ltd | London | 2019 |
| A G Preston Services Ltd | Minster Lovell | 2014 |
| A G Printing & Publishing Ltd | Wembley | 1998 |
| A G S (Zinc Alloys) Limited | Staffordshire | 1987 |
| A G Tailoring Limited | Twickenham | 2025 |
| A G Turner Electrical Limited | Thirsk | 2026 |
| A G Welding Ltd | Mirfield | 2015 |
| A Geoghegan Ltd | Leeds | 2023 |
| A Gill Limited | Fraserburgh | 2004 |
| A Glaze Limited | Sevenoaks | 2005 |
| A Gleadall Jewellery Ltd | Birmingham | 2019 |
| A Good Helping CIC | Salisbury | 2021 |
| A Good Old Yarn CIC | Northampton | 2026 |
| A Good Rabbit Ltd | London | 2022 |
| A Gordon Electrical Services Ltd | Lytham St. Annes | 2012 |
| A Grade Carpentry Ltd | Narberth | 2025 |
| A Grade Coating Ltd | Huddersfield | 2014 |
| A Grade Sheds Ltd | St. Helens | 2017 |
| A Grade Shotblast & Fabrications Ltd | Ashton-Under-Lyne | 2026 |
| A Gray Electrical Services (Scot) Limited | Glasgow | 2023 |
| A Green Dental LAB Ltd | Glasgow | 2020 |
| A Griffin Interiors Ltd | Sheffield | 2024 |
| A H Airconditioning Ltd | Edgware | 2008 |
| A H Carpenters & Joinery Ltd | Abbots Langley | 2017 |
| A H Electrical & EV Services Ltd | Braintree | 2021 |
| A H Electrical (London) Ltd | Enfield | 2025 |
| A H Engineering (North East) Limited | Hebburn | 1999 |
| A H Fabrication (Hereford) Limited | Hereford | 2020 |
| A H GAS Services Ltd | Rotherham | 2011 |
| A H Marks Holdings Limited | Bradford | 2005 |
| A H Refinishing Limited | Sidcup | 2016 |
| A Harley Ltd | Northampton | 2015 |
| A Harry Locksmith Ltd | Swansea | 2024 |
| A Hills Offshore Services Ltd | Dundee | 2026 |
| A Hird Rail Contractors Limited | Sheffield | 2014 |
| A Holley Design Ltd | Rayleigh | 2018 |
| A Hopkins Ltd | Bideford | 2018 |
| A Hughes and Son(Skellingthorpe)Limited | Long Bennington | 1955 |
| A I Dental Engineering Limited | High Wycombe | 2016 |
| A I General Trading Ltd | Leicester | 2025 |
| A I Healthcare Limited | High Wycombe | 2007 |
| A I Industries Ltd | Newport | 2015 |
| A I Restaurants Limited | Birmingham | 2018 |
| A I Stone Services Ltd | Weston-Super-Mare | 2023 |
| A Ideal Products (UK) Ltd | Mitcham | 2015 |
| A J & D Chapelhow (Cliburn) Limited | Penrith | 2016 |
| A J Access Platforms Limited | Normanton | 2011 |
| A J Animal Feeds Ltd | Marlborough | 2013 |