| Alpha Photo Supplies Limited | Lichfield | 2006 |
| Alpha Photographers Ltd | Walsall | 2011 |
| Alpha Photographic Ltd | Dorchester | 2007 |
| Alpha Pipe Limited | Paisley | 2024 |
| Alpha Planning Ltd. | London | 2012 |
| Alpha Plus Holdings Limited | London | 2002 |
| Alpha Plus RGM Limited | Sheffield | 2011 |
| Alpha Prema UK Limited | London | 2005 |
| Alpha Pro Consultancy Ltd | Birmingham | 2021 |
| Alpha Pro Partners Ltd | London | 2010 |
| Alpha Pro Solution Ltd | Erskine | 2024 |
| Alpha Probate Limited | London | 2023 |
| Alpha Project Consultants Limited | Borehamwood | 2013 |
| Alpha Project Services Ltd | Solihull | 2025 |
| Alpha Projects EOT Trustee Limited | Dundee | 2025 |
| Alpha Projects Group Limited | Aylesbury | 2016 |
| Alpha Properties (Leicester) Limited | Stockton-On-Tees | 2014 |
| Alpha PS UK Ltd | London | 2022 |
| Alpha Public Relations Limited | Bury | 2017 |
| Alpha Quality Services Ltd | Norwich | 2021 |
| Alpha Quantity Surveyors Limited | Sutton Coldfield | 2019 |
| Alpha Rail Engineering Limited | Crook | 2004 |
| Alpha Rail S&T Limited | Stockport | 2009 |
| Alpha RAT Ltd | Bristol | 2014 |
| Alpha Ratings Advisory Ltd | London | 2026 |
| Alpha RE Ltd | London | 2023 |
| Alpha Recycling Solutions Ltd | Bedford | 2012 |
| Alpha Reliability Ltd | Manchester | 2023 |
| Alpha Representative Consultancy Limited | Rochdale | 2016 |
| Alpha Research Analytics Ltd | Dartford | 2019 |
| Alpha Research Tech Limited | Burnham-On-Crouch | 2024 |
| Alpha Research Technicals Limited | Edgware | 2024 |
| Alpha Residential Limited | Hove | 2008 |
| Alpha Return Limited | Ashtead | 2017 |
| Alpha Risk & MI Solutions Limited | Verwood | 2023 |
| Alpha Romeo Consultants Ltd | Wimbledon | 2017 |
| Alpha S Aviation Ltd | Leicester | 2019 |
| Alpha Safety Limited | Shetland | 1984 |
| Alpha Safety Team Ltd | Doncaster | 2019 |
| Alpha Scaffold Design Ltd. | Ilford | 2011 |
| Alpha Screening Limited | Hayes | 2013 |
| Alpha Script Medical Writing Ltd | Solihull | 2025 |
| Alpha Secraservices Ltd | Fulham | 2021 |
| Alpha Secure Ltd | Hayes | 2019 |
| Alpha Seven Consulting Limited | Newhaven | 2016 |
| Alpha Seven Limited | Glasgow | 2005 |
| Alpha Shindara Associates Limited | Leeds | 2010 |
| Alpha Sierra Advisory Limited | London | 2018 |
| Alpha Sierra Bravo Consulting Limited | Lymington | 2025 |
| Alpha Sierra Limited | London | 2007 |
| Alpha Sigma Bookkeeping Ltd | Watford | 2015 |
| Alpha Sigma Limited | Harlow | 2023 |
| Alpha Sigma Partnerships Ltd | Andover | 2026 |
| Alpha Skies Ltd | Glasgow | 2021 |
| Alpha Social Ltd | London | 2026 |
| Alpha Social Media Limited | London | 2016 |
| Alpha Social Media Marketing Ltd | Bradford | 2025 |
| Alpha Solutions Consultancy Ltd | Coatbridge | 2025 |
| Alpha Solutions York Limited | Harrogate | 2024 |
| Alpha Specialist Services Ltd | Sheffield | 2022 |
| Alpha Specialist Surveys Ltd | Nottingham | 2018 |
| Alpha Specialists Limited | Romford | 2006 |
| Alpha Springs Solicitors Ltd | East Ham | 2023 |
| Alpha Stanway Finance Limited | Malvern | 2012 |
| Alpha Strategic Advisory Ltd | Billericay | 2019 |
| Alpha Strategic Capital Ltd | London | 2023 |
| Alpha Strategies Ltd | London | 2020 |
| Alpha Strategy Ltd | Richmond | 2026 |
| Alpha Studio Wrap Ltd | Goole | 2024 |
| Alpha Subco Limited | Daresbury | 2020 |
| Alpha Surveys (East Anglia) Ltd | Dereham | 2021 |
| Alpha Surveys Limited | Cranbrook | 2009 |
| Alpha Swanson Ltd | York | 2013 |
| Alpha System Solutions Ltd | London | 2006 |
| Alpha Tango Architecture Limited | Kilmarnock | 2018 |
| Alpha Tattoos Ltd | Southampton | 2022 |
| Alpha TAU Engineering Ltd | Manchester | 2022 |
| Alpha Tauri Maritime Limited | London | 2016 |
| Alpha Taurus Ventures Limited | Leeds | 2023 |
| Alpha Tax Accounting Ltd | Milton Keynes | 2025 |
| Alpha Tax Advisors Limited | United Kingdom | 2021 |
| Alpha Tax Business Services Ltd | Harrow | 2018 |
| Alpha Tax Solutions Limited | Birmingham | 2020 |
| Alpha Tech Capital Ltd | Richmond | 2018 |
| Alpha Technology (INT) Ltd | Northampton | 2013 |
| Alpha TEN Management Centre Ltd | London | 2018 |
| Alpha Testing Services Limited | Brierley Hill | 2022 |
| Alpha Tiger Limited | Warminster | 2013 |
| Alpha to Omega Accountancy Solutions Limited | Dartford | 2022 |
| Alpha to Omega Accounting Limited | Kingston Upon Thames | 2006 |
| Alpha Trade & Services Limited | London | 2018 |
| Alpha Trains (UK) Limited | London | 2000 |
| Alpha Translating & Interpreting Services Limited | Bonnyrigg | 2000 |
| Alpha Trion Ltd | London | 2021 |
| Alpha TUX Limited | London | 2023 |
| Alpha Two Ltd | Birmingham | 2024 |
| Alpha U Limited | Manchester | 2023 |
| Alpha Uncovered Limited | London | 2024 |
| Alpha Vector Capital Limited | London | 2013 |
| Alpha Wave Technology Limited | Oxfordshire | 1998 |