| A Plus ENT Ltd | Covent Garden | 2022 |
| A Plus Medical Group Ltd | London | 2024 |
| A Plus Nutrition Ltd | Ashton-Under-Lyne | 2019 |
| A Plus Q Ltd | Sale | 2025 |
| A Plus Recovery and Repairs Ltd | Dereham | 2017 |
| A Plus Standard Ltd | Little Paxton St Neots | 2017 |
| A Plus Windows & Doors Limited | Watford | 1986 |
| A Pole Services Ltd | Swadlincote | 2025 |
| A Print & Design Ltd | Newport | 2003 |
| A Procurement Podcast Limited | Stafford | 2026 |
| A Proud Company Ltd. | Coventry | 2020 |
| A R a Bakery Ltd | Bolton | 2024 |
| A R Autos Limited | Swansea | 2003 |
| A R Barrier Systems Ltd | St. Austell | 2025 |
| A R C Plant Repairs Ltd | Barnard Castle | 2020 |
| A R Carpentry & Installations Limited | Llanelli | 2022 |
| A R Catering Services Limited | Benfleet | 2026 |
| A R D Technology Limited | Warwick | 1997 |
| A R Door Systems Limited | Newbury | 2026 |
| A R Essential OIL Limited | London | 2025 |
| A R Installs Limited | Halstead | 2016 |
| A R Joinery (Design & Manufacture) Limited | Pontefract | 2008 |
| A R Metalcraft Ltd | Goole | 2025 |
| A R Morris Building & Joinery Contractor Ltd | Craven Arms | 2019 |
| A R Steelwork Ltd | Caerphilly | 2014 |
| A R Structurals Ltd | Chatteris | 2019 |
| A R Turbo Engineering Limited | Batley | 1998 |
| A Radich Limited | Wallsend | 2017 |
| A Razzaq Enterprise Ltd | Glasgow | 2024 |
| A Resourcing Limited | Birmingham | 2022 |
| A Roastery Ltd | Aylesbury | 2022 |
| A Robinson & SON Ltd | Newry | 2021 |
| A Rogaczewski Limited | Ellon | 2024 |
| A Roling Electrical Services Limited | Eastleigh | 2015 |
| A Room in My House Limited | London | 2007 |
| A Ryan and SON Limited | Much Wenlock | 2011 |
| A S & G Reece Limited | Cannock | 2013 |
| A S Alloy Fabrications Limited | Melton Mowbray | 2025 |
| A S Belts Limited | Sheffield | 2013 |
| A S Crane Services Limited | Burnley | 2013 |
| A S D Painting Solutions Limited | Leicester | 2024 |
| A S Doughty Limited | Nottingham | 1997 |
| A S Electrical (Perth) Limited | Perth | 2017 |
| A S Engineering (UK) Limited | Poole | 2004 |
| A S F Engineering Limited | Ballymena | 2000 |
| A S Installations Limited | London | 2022 |
| A S Lift Services Limited | Tamworth | 2019 |
| A S M Surface Technologies Limited | Darlington | 2006 |
| A S Marine Repairs Ltd | Verwood | 2022 |
| A S Motorsport Limited | Norfolk | 2007 |
| A S Mughal Brothers Ltd | Bradford | 2025 |
| A S Organic Ltd | Hereford | 2012 |
| A S Peck Engineering Limited | Ruislip | 1986 |
| A S Plastics Ltd | Warrington | 2003 |
| A S Reeks Electrical Limited | Hereford | 2020 |
| A S Roberts Welding Ltd | Bolton | 2015 |
| A S S E T Technologies Ltd | Southampton | 2019 |
| A S Services (U.K.) Limited | Hornchurch | 2025 |
| A S T Logistics Limited | Batley | 2018 |
| A Scoop of Joy Ltd | Leeds | 2020 |
| A Scott Interiors Ltd | Bolton | 2018 |
| A Scott Stairs & Joinery Limited | Cowdenbeath | 2019 |
| A Shackleton Electrical Contractors Limited | Bournemouth | 2011 |
| A Shade Above Limited | Brighton | 2000 |
| A Shade Greener Maintenance Limited | Tankersley | 2013 |
| A Shaw Construction Ltd | Barnsley | 2021 |
| A Signs (Scunthorpe) Limited | Scunthorpe | 2003 |
| A Simple Xpression Ltd | Blackburn | 2026 |
| A Sleeping Samurai Limited | Preston | 2023 |
| A Slice of Cake Ltd | Kings Langley | 2010 |
| A Slice of Heaven Ltd | Newtownards | 2011 |
| A Slice of Home Ltd | Leeds | 2017 |
| A Slice of Nice Ltd | Pinner | 2011 |
| A Smart Phull Aluminium Bifolding Doors and Windows Ltd | Reading | 2021 |
| A Smith Engineering Limited | Hungerford | 2023 |
| A Smith GT. Bentley Limited | Gray'S Inn | 2000 |
| A Smith Prints Ltd | Oldham | 2025 |
| A Solutions Limited | Chelmsford | 2011 |
| A Sound MAN Limited | Enfield | 2018 |
| A Souter Electrical Ltd | Aberdeen | 2024 |
| A Spoonful of Moonlight Ltd | London | 2024 |
| A Square London Limited | London | 2024 |
| A Squared Supplements Ltd | Telford | 2026 |
| A Squared Technologies Limited | Weston Super Mare | 2014 |
| A Star Academics Ltd | Pinner | 2025 |
| A Star Fashion Ltd | Manchester | 2019 |
| A Star Quality Group Ltd | Essex | 2017 |
| A Star Recovery Ltd | Birmingham | 2014 |
| A Star Signs Ltd | Wokingham | 2014 |
| A Starkie Wroughtironsmiths Ltd | Nelson | 2012 |
| A Sticky Situation Limited | Lichfield | 2018 |
| A Stitch Different Community Interest Company | Barrow-In-Furness | 2014 |
| A Stitch in Twine Ltd | Henley-On-Thames | 2024 |
| A Stitching Room Ltd | London | 2019 |
| A Sturrock & SON (Kirkbuddo) Limited | Forfar | 1986 |
| A Suggitt Limited | Middlesbrough | 1962 |
| A Sullivan Limited | Cwmbran | 2012 |
| A Summer in Ltd | London | 2025 |
| A Swansbury (Woodfinishing) Limited | Princes Risborough | 2009 |
| A T Abroad Limited | Stockton-On-Tees | 2024 |