| Alpha Fleet Solutions Ltd | Cradley Heath | 2023 |
| Alpha Forge UK Limited | Luton | 2025 |
| Alpha Foxtrot Aeronautical Ltd | Hazlemere | 2023 |
| Alpha Gamma Beta Ltd | Milton Keynes | 2001 |
| Alpha Glass Ltd | Tipton | 2025 |
| Alpha Graphic Machinery (UK) Ltd | Wakefield | 2010 |
| Alpha Group Holdings Limited | Droitwich | 2021 |
| Alpha Herb UK Ltd | London | 2025 |
| Alpha Home Design Ltd | Ripon | 2019 |
| Alpha Image (HD) Ltd | Witney | 2003 |
| Alpha Industrial Manufacture Limited | Beckenham | 2025 |
| Alpha Injection Moulding Limited | Hinckley | 2022 |
| Alpha Install Limited | Coventry | 2014 |
| Alpha Interior Designs Ltd | Rainworth, Mansfield | 2021 |
| Alpha International Associates Limited | Sherborne | 1987 |
| Alpha Ironwork Limited | Buntingford | 2005 |
| Alpha Labels and Signs Limited | Caterham | 1994 |
| Alpha Laser Solutions Limited | Solihull | 2022 |
| Alpha Lifecare Limited | London | 2014 |
| Alpha Lifts Ltd | Bedford | 2023 |
| Alpha Links Limited | Glasgow | 2025 |
| Alpha LUX Limited | Shildon | 2014 |
| Alpha Machine Knife Company Limited | Rotherham | 2011 |
| Alpha Machines Limited | Altrincham | 2025 |
| Alpha Manufacturing Hixon Limited | Stafford | 1994 |
| Alpha ME Ltd | Bristol | 2023 |
| Alpha Media Solutions Ltd | Leeds | 2006 |
| Alpha Metalwork Services Ltd | Rotherham | 2023 |
| Alpha Ministries Ltd | Stanmore | 2024 |
| Alpha Moisture Systems Limited | Leeds | 2000 |
| Alpha Motor Care Ltd | Hull | 2014 |
| Alpha Nano Developments Limited | Brixham | 2017 |
| Alpha Nature Ltd | Morecambe | 2024 |
| Alpha of Redditch Ltd | Redditch | 2013 |
| Alpha Offshore Engineering and Management Services Limited | Leeds | 1985 |
| Alpha Oilfield Equipment Limited | Leeds | 1982 |
| Alpha Omega Arms Ltd | Maidstone | 2022 |
| Alpha Omega Limited | Buckinghamshire | 1998 |
| Alpha Omega Pack UK Limited | Morden | 2024 |
| Alpha One 3D Ltd | Hemel Hempstead | 2026 |
| Alpha One Media Ltd | Bury St. Edmunds | 2018 |
| Alpha Packaging & Strapping Limited | Stallingborough | 2004 |
| Alpha Pallets Limited | Northampton | 2012 |
| Alpha Pattern Air Ltd | Gravsend | 2016 |
| Alpha PCB Ltd | Altrincham | 2026 |
| Alpha Performance Fabrication Limited | Northampton | 2018 |
| Alpha Performance Solutions Limited | London | 2024 |
| Alpha Pipelines Limited | Maesteg | 2008 |
| Alpha Plast Ltd | Manchester | 2024 |
| Alpha Plastics Industries Ltd | Middleton | 1997 |
| Alpha Pods Ltd | Glasgow | 2026 |
| Alpha Polymers Limited | Liverpool | 1981 |
| Alpha Powder Coating & Exhausts Ltd | Dumfries | 2020 |
| Alpha Powder Coatings (WET Paint) Limited | Peterborough | 2009 |
| Alpha Precision Engineering (Poole) Limited | Poole | 1987 |
| Alpha Prestige Repair Ltd | Walsall | 2026 |
| Alpha Print and Signs Limited | Nelson | 2025 |
| Alpha Print NW Ltd | Rhyl | 2019 |
| Alpha Print Solutions (NE) Limited | Newcastle Upon Tyne | 2008 |
| Alpha Process Controls (International) Limited | Peterlee | 1978 |
| Alpha Profiles Ltd | Rochdale | 2024 |
| Alpha Property Maintenance Ltd | Maldon | 2020 |
| Alpha Punch and Machinery Limited | Sheffield | 2007 |
| Alpha R F Limited | Kent | 1998 |
| Alpha Rail Limited | Huthwaite | 2001 |
| Alpha Refrigerants UK Limited | London | 2025 |
| Alpha Responseprint and Mail Limited | Gloucester | 2004 |
| Alpha Rewinds Limited | St. Helens | 2025 |
| Alpha Rhino Limited | London | 2025 |
| Alpha Sculptoris Ltd | Isleworth | 2022 |
| Alpha Seats Limited | Hinckley | 2025 |
| Alpha Services (Plymouth) Limited | Plymouth | 1991 |
| Alpha Sheet Metal & Laser Ltd | Manchester | 2011 |
| Alpha Sheet Metal (North) Limited | Wigan | 1998 |
| Alpha Sheet Metal Limited | Morecambe | 2002 |
| Alpha Sheetmetal & Ductwork Services Limited | Norwich | 1999 |
| Alpha Shopfront Shutter Ltd | Ilford | 2022 |
| Alpha Sign Systems Limited | Manchester | 2007 |
| Alpha Signature Limited | Bolton | 2020 |
| Alpha Solway Limited | Lerwick | 1997 |
| Alpha Sonic Systems Ltd | London | 2016 |
| Alpha Spares and Services Ltd | London | 2025 |
| Alpha Steel Ltd | Bolton | 2020 |
| Alpha Strength Ltd | Newcastle Upon Tyne | 2020 |
| Alpha Systems Fabrication Limited | Newcastle Under Lyme | 2015 |
| Alpha Tech Solutions IOW Limited | Lake | 2018 |
| Alpha Technical Solutions Ltd | Chatham | 2025 |
| Alpha Technician's Ltd | Manchester | 2024 |
| Alpha Technology Industrial Co., Ltd | Beckenham | 2023 |
| Alpha Therm Limited | Sevenoaks | 1966 |
| Alpha to Omega Creative Business Solutions Limited | London | 2006 |
| Alpha Toro Holdings Limited | Wallington | 2012 |
| Alpha UK Solutions Limited | London | 2023 |
| Alpha Wallcoverings Ltd | Blackburn | 2025 |
| Alpha Welding & Steel Fabrications Ltd | Dartford | 2015 |
| Alpha Welding and Mechanical Solutions Limited | Milton Keynes | 2016 |
| Alpha Welding Ltd | Guildford | 2023 |
| Alpha Xerotech (PVT) Limited | London | 2021 |
| Alpha-Active Ltd | Honiton | 2001 |
| Alpha-Butter Ltd | Waterlooville | 2025 |