| A&S ALL Services Ltd | Glasgow | 2018 |
| A&S BED Store Limited | Dewesbury | 2024 |
| A&S Company Inc Ltd | London | 2013 |
| A&S Desserts Limited | Cardiff | 2025 |
| A&S Fabrication Services Limited | Blackpool | 2017 |
| A&S Home Scents Ltd | Manchester | 2025 |
| A&S Kitchen Wardrobe Ltd | Mitcham | 2014 |
| A&S Landscape Limited | Shrewsbury | 2015 |
| A&S Lifts Ltd | Richmond | 2020 |
| A&S Moore Limited | London | 2018 |
| A&S Renovations Ltd | Ipswich | 2023 |
| A&S Specialist Supplies Ltd. | Ilford | 2016 |
| A&S Wood Products Limited | Porth | 2018 |
| A&T Corp Limited | Derby | 2023 |
| A&T Engineering Ltd | Coventry | 2014 |
| A&T Plastics Ltd | Wrexham | 2022 |
| A&W New Energy and Material Co., Ltd | London | 2023 |
| A&Y Blinds Ltd | Birmingham | 2022 |
| A'S Prestige Cars Ltd | Derby | 2024 |
| A'Scakes Limited | London | 2025 |
| A+ Boilers & Electrics Ltd | Harlow | 2008 |
| A-1 Aviation National Services Ltd | Slough | 2019 |
| A-B Marine Services UK Limited | Bournemouth | 2009 |
| A-Bax Precision Engineering Ltd | Kettering | 2006 |
| A-Box Limited | Chelmsford | 2008 |
| A-Chem Limited | Alfreton, Derbyshire | 1980 |
| A-Deus Ltd | Edinburgh | 2020 |
| A-Eon Technology Ltd | Cardiff | 2012 |
| A-Fax Limited | Elland | 2017 |
| A-Gen (NI) Ltd | Dungannon | 2011 |
| A-Guard Ltd | Elland | 2020 |
| A-Hard Builders Ltd | Sidcup | 2021 |
| A-Ka'Y Music Limited | Uckfield | 2012 |
| A-Lign Bead Ltd | Goole | 2018 |
| A-Line Jewellery Ltd | London | 2010 |
| A-Mag Systems Limited | Swindon | 2003 |
| A-Maize-Ing Meals Ltd | Weston-Super-Mare | 2025 |
| A-Mix Concrete Ltd | London | 2026 |
| A-Mobiles Ltd | Bolton | 2021 |
| A-O Brewing Company Limited | Newport | 2019 |
| A-Ok Complete Compliance Ltd | Eversley | 2016 |
| A-One Control Services Ltd | Markethill | 2018 |
| A-One Kitchens and Bedrooms Ltd | Colne | 2017 |
| A-Plus Heating & Cooling Ltd | Birmingham | 2024 |
| A-Print (Chesterfield) Limited | South Yorkshire | 1997 |
| A-Rated Doors & Windows Ltd | Birmingham | 2018 |
| A-Rich Nutrition Ltd | Croydon | 2018 |
| A-S Energy Solutions Ltd | Spalding | 2009 |
| A-Safe Group Holdings Limited | Elland | 2022 |
| A-Safe Group Ltd | Elland | 1983 |
| A-Safe HQ Ltd | Elland | 2005 |
| A-Safe International Ltd | Elland | 2016 |
| A-Safe UK Ltd | Elland | 2016 |
| A-Star Finishing Ltd | Chichester | 2021 |
| A-Stat Office Technology Limited | Wolverhampton | 1989 |
| A-Team Solar Ltd | York | 2022 |
| A-Tec Services (Humber) Limited | Beverley | 2015 |
| A-Tec Systems Limited | Wigan | 1991 |
| A-Tech Fabrications Limited | Newton Aycliffe | 1994 |
| A-Tech Global Ltd | Newton Aycliffe | 2011 |
| A-Vault Inc. Ltd | High Wycombe | 2025 |
| A-X Manufacturing Ltd | Dungannon | 2019 |
| A-Z Beauty Ltd | Uxbridge | 2023 |
| A-Z Fabrication Ltd | Bexleyheath | 2023 |
| A-Z Furniture Solutions Limited | Lincoln | 2015 |
| A-Z Machining Ltd | Blyth | 2022 |
| A-Z Major Projects Limited | Lincoln | 2024 |
| A-Z Manufacturing Ltd | Cardiff | 2022 |
| A-Z Medical Ltd | Sale | 2025 |
| A-Z Vitamins Ltd | Sale | 2003 |
| A-Ztec Bespoke Metalwork Ltd | Wakefield | 2017 |
| A. & B. Air Solutions Limited | Wrexham | 2001 |
| A. & C. Maintenance Limited | Dinnington Sheffield | 1974 |
| A. & C. Sheet Metal Limited | Manchester | 1997 |
| A. & D. Lock and Key Co. Limited | Birmingham | 1975 |
| A. & E. Connock (Perfumery & Cosmetics) Limited | Essex | 1975 |
| A. & E. Plastic Fabrications Limited | Southwell | 1986 |
| A. & G. Toseland Limited | Kettering | 1992 |
| A. & I. Rowlands Limited | Norfolk | 1980 |
| A. & J. Robertson (Granite) Limited | Westhill | 1963 |
| A. & N. Vevers Limited | Bradford | 1983 |
| A. & P.J. Steels Limited | Stourbridge | 1977 |
| A. & R. Electronic Developments Limited | Cannock | 1991 |
| A. a .Gausu Ltd Ltd | Derby | 2023 |
| A. a. Fine Casting Limited | London | 1996 |
| A. a. I. Fire Systems Ltd. | Stirling Way, Borehamwood | 1997 |
| A. a. I. Security Systems Ltd. | Stirling Way, Borehamwwod | 1997 |
| A. a. Taylor Limited | East Sussex | 1997 |
| A. Allen Conservation & Restoration Limited | Stockport | 2003 |
| A. and G. Structures Limited | Bracknell | 1979 |
| A. Ashton Limited | Essex | 2003 |
| A. B. Cooper Limited | Beaconsfield | 1999 |
| A. B. Rollings Clothiers Ltd | London | 2019 |
| A. B. Wight Ltd | Melrose | 2018 |
| A. Beattie Engineering Services Limited | Westhill | 1998 |
| A. Bratt & SON Limited | Lenton Industrial Estate West | 1964 |
| A. Brotton Engineering Limited | Redcar | 2017 |
| A. Butchers Limited | Birmingham | 2025 |
| A. C. Cossor & Son(Surgical) Limited | Egham | 1958 |
| A. C. Fabrications Limited | Barnsley | 2000 |