| Alpha MIX Ltd | Tenbury Wells | 2014 |
| Alpha Mortgage & Consultancy Ltd | Wolverhampton | 2025 |
| Alpha Mortgage Hub Ltd | Church Laneham,Retford | 2024 |
| Alpha Mortgage Services Limited | Crawley | 2020 |
| Alpha Mortgage Solutions Ltd | London | 2018 |
| Alpha Mortgages Limited | Stockport | 2016 |
| Alpha MU Holdings Ltd | Biggleswade | 2026 |
| Alpha Omega Property Investments Group Ltd | Wallsend | 2026 |
| Alpha Omega Victory Capital Holdings Ltd | London | 2025 |
| Alpha One Strategies Limited | London | 2015 |
| Alpha P&P Holdings Ltd | Gateshead | 2020 |
| Alpha Partners Leasing Limited | London | 2000 |
| Alpha Petroleum (UK) Holdings Limited | London | 2013 |
| Alpha Plant Holdings Limited | Chesterfield | 2017 |
| Alpha Plus Properties Ltd | London | 2017 |
| Alpha Plus Topco Limited | Sheffield | 2022 |
| Alpha Premier Holding Limited | London | 2018 |
| Alpha Pro Wealth Ltd | Chelmsford | 2022 |
| Alpha Projects (Holdings) Limited | Worthing | 2018 |
| Alpha Property Holdings (East) Limited | Leeds | 2013 |
| Alpha R2 Limited | Swansea | 2016 |
| Alpha Real Capital Services Limited | London | 2016 |
| Alpha Real Estate Investments Ltd | Polegate | 2020 |
| Alpha Red Investments Ltd | Shenley | 2023 |
| Alpha Rental Group Ltd | Birmingham | 2013 |
| Alpha Rentals Ltd | Gortin | 2021 |
| Alpha Romero Ltd | Barking | 2025 |
| Alpha Safety Consultants Ltd | Huntly | 2023 |
| Alpha Safety Group Limited | Fforestfach | 2021 |
| Alpha Sana Ltd | Birmingham | 2019 |
| Alpha Secured Investments Limited | Henley-On-Thames | 2020 |
| Alpha Security Logistics Limited | Shrewsbury | 2015 |
| Alpha Share Limited | Walthamstow | 2022 |
| Alpha Spain Holdco Limited | London | 2022 |
| Alpha Sports Global Limited | Broadstairs | 2026 |
| Alpha Surveys (East Anglia) Holdings Limited | Dereham | 2024 |
| Alpha Sustainable Holdings Ltd | Uxbridge | 2024 |
| Alpha Systematix UK Ltd | London | 2025 |
| Alpha Testing Services Holdings Limited | Brierly Hill | 2023 |
| Alpha to Omega Business Solutions Ltd | Writtle | 2011 |
| Alpha TR Limited | London | 2025 |
| Alpha Trade Dynamics Ltd | London | 2024 |
| Alpha Trade Ltd | London | 2022 |
| Alpha Trading Group NE Ltd | Bristol | 2019 |
| Alpha Trustee Services Ltd | Newcastle Upon Tyne | 2023 |
| Alpha TT Limited | Basildon | 2023 |
| Alpha Ucits Ltd. | London | 2009 |
| Alpha UK Holdings Limited | London | 2020 |
| Alpha UNO Limited | London | 2011 |
| Alpha Vera Consulting Ltd | Shipston-On-Stour | 2020 |
| Alpha Wealth Limited | Edinburgh | 2009 |
| Alpha Wealth Management Limited | London | 2016 |
| Alpha Whiskey Limited | Cheltenham | 2014 |
| Alpha Wholesale Limited | Birmingham | 2008 |
| Alpha Workforce Ltd | Watford | 2016 |
| Alpha X Ventures Ltd | London | 2022 |
| Alpha-Omega Financial Services Limited | Ipswich | 2007 |
| Alpha-Q Investment Management Limited | Kingston Upon Thames | 1997 |
| ALPHA2020 Ltd | Manchester | 2020 |
| ALPHA23 Limited | London | 2021 |
| Alphabay Ltd | Birmingham | 2026 |
| Alphaberry Holding Limited | Aylesbury | 2024 |
| Alphabet (GB) Limited | Farnborough | 1996 |
| Alphabet Admin Limited | Eastbourne | 2023 |
| Alphabet Associates Ltd | London | 2019 |
| Alphabet Capital Advisors Ltd | London | 2003 |
| Alphabet Capital Ltd | Bury St. Edmunds | 2016 |
| Alphabet Equityco Limited | London | 2023 |
| Alphabet Holdco Limited | Bury St. Edmunds | 2020 |
| Alphabet Westbourne Holdings Limited | Chesham | 2026 |
| Alphabeta Genesis Limited | Harrow | 2020 |
| Alphabeta Holdings Limited | Liverpool | 2025 |
| Alphabetum Limited | Weybridge | 2022 |
| Alphabyte Holdings Limited | Lisburn | 2025 |
| Alphacap Ltd | Kenley | 2015 |
| Alphace Limited | London | 2017 |
| Alphaco Investments Limited | London | 2012 |
| Alphaco Ltd | London | 2009 |
| Alphacom Holdings Ltd | London | 2019 |
| Alphadyne (UK) Holdings II Limited | London | 2017 |
| Alphafox Investments Ltd | Stourbridge | 2010 |
| Alphafx Investments Limited | Bolton | 2023 |
| Alphagraph Mgmt Ltd | London | 2024 |
| Alphagraph VC Ltd | London | 2025 |
| Alphajah Ltd | London | 2017 |
| Alphajet Ventures Limited | Birmingham | 2023 |
| Alphalite Properties Limited | London | 2023 |
| Alphametric Solutions Ltd | Hampton | 2009 |
| Alphamore Corporation Ltd | Castleford | 2000 |
| Alphan Limited | Windsor | 2024 |
| Alphane Capital Limited | London | 2017 |
| Alphanom Capital Ltd | Crowthorne | 2022 |
| Alphapet UK Ventures Limited | Hassocks | 2021 |
| Alphaplus Investments Ltd | Epsom | 2022 |
| Alphaquarry Global Markets Ltd | Crawley | 2018 |
| Alpharisk Ltd | Barnsley | 2019 |
| Alphas Group Ltd | London | 2018 |
| Alphastar Scotland Ltd | Glasgow | 2024 |
| Alphatradr Limited | Belfast | 2026 |
| Alphavest Limited | Romford | 2023 |