| Alphaview Ltd | London | 2015 |
| Alphawave IP Group Limited | Worthing | 2020 |
| Alpheratz Strategic Consulting Ltd | London | 2018 |
| Alphi Investments Limited | London | 2021 |
| Alphidence Capital Limited | London | 2020 |
| Alphin SAR Holdings Limited | Oldham | 2022 |
| Alphire Holdings Limited | Swadlincote | 2022 |
| Alphorizen Ltd | London | 2023 |
| Alphytoken Limited | London | 2025 |
| Alpin Holdings Limited | Selby | 2026 |
| Alpin Horizons Ltd | Ruislip, | 2025 |
| Alpine Accident Claims Limited | Derby | 2004 |
| Alpine Atlantic Ltd | Nottingham | 2025 |
| Alpine Capital Ltd | Winchester | 2018 |
| Alpine Construction Holdings Limited | Southend-On-Sea | 2020 |
| Alpine Dualit Limited | Wisbech | 2021 |
| Alpine Finance Ltd | London | 2022 |
| Alpine Financial Services Ltd | Tonypandy | 2022 |
| Alpine FX Ltd | London | 2017 |
| Alpine Global Prime Holdings Limited | London | 2025 |
| Alpine Grove Partners (UK) Ltd | London | 2019 |
| Alpine HC Holdings Limited | Hull | 2020 |
| Alpine Insurance Services (Holdings) Limited | Benfleet | 2001 |
| Alpine Insurance Services Limited | Benfleet | 1986 |
| Alpine Private Wealth Ltd | Peterborough | 2024 |
| Alpine Technologies Holdings Ltd | Harrogate | 2026 |
| Alpine Together Ltd | Nottingham | 2024 |
| Alpine UW (Britain) Ltd | Tonbridge | 2026 |
| Alpine View Holdings Limited | Maldon | 2025 |
| Alpinebeat Unlimited | Antrim | 2020 |
| Alpinecove Limited | Grantham | 1986 |
| Alpinex London Ltd | London | 2025 |
| Alpini Capital Limited | Altrincham | 2021 |
| Alpinique Investments Ltd | London | 2024 |
| Alpinista Limited | Reading | 2022 |
| Alpirg Investments Ltd | London | 2022 |
| Alpium Limited | Cambridge | 2025 |
| Alpivoire Limited | St Albans | 2019 |
| Alpo Investment Ltd | Romford | 2024 |
| Alps F S Limited | Worthing | 1991 |
| Alpsee Capital Ltd | London | 2021 |
| Alpstar Capital UK Limited | Liverpool | 2003 |
| Alpstone Capital Services Limited | London | 2016 |
| Alpx Guarding Ltd | Walsall | 2025 |
| Alquity Investment Management Limited | London | 2006 |
| Alquity UK Limited | London | 2012 |
| ALR Assets & Holdings Limited | Swansea | 2025 |
| ALR Brokers Ltd | Newent | 2021 |
| ALR Consultancy Services Ltd | Musselburgh | 2016 |
| Alrahi Holdings Limited | Stockton-On-Tees | 2026 |
| Alrayan Bank Limited | London | 2002 |
| Alrg Investments Limited | Stoke-On-Trent | 2021 |
| Alright Investments | London | 2022 |
| Alro Homes Ltd | Blackwood | 2021 |
| Alross Holdings Ltd | Dingwall | 2024 |
| ALS Asset Management Ltd | Shrewsbury | 2020 |
| ALS Automation Group Limited | Cheltenham | 2022 |
| ALS Capital Ltd | London | 2026 |
| ALS Financial Solutions Limited | Cardiff | 2012 |
| ALS Group Holdings Limited | Aberdeen | 2019 |
| ALS Holding Group Services Limited | Newport | 2021 |
| ALS III Member Co Limited | London | 2018 |
| ALS International Holdings Limited | Cheltenham | 2025 |
| ALS Investments (London) Ltd | London | 2021 |
| ALS Investments Limited | London | 2017 |
| ALS Managed Services (Topco 2026) Limited | Ystrad Mynach | 2026 |
| ALS Protect Limited | Bury | 2026 |
| ALS Ventures Ltd | Hednesford | 2026 |
| Alsa Management Services Ltd | London | 2019 |
| Alsaadi Limited | Sheffield | 2026 |
| Alsafwa Corp Ltd. | London | 2026 |
| Alsakerfx Ltd | London | 2021 |
| Alsaleh Enterprise Limited | Southsea | 2026 |
| Alsarayefi for Real Estate and Development Ltd | Manchester | 2025 |
| Alsback Holding Ltd | London | 2024 |
| Alsco Holdings Ltd | Formby | 2024 |
| Alscro Limited | Pitsea | 2014 |
| Alset Property Holdings Limited | Birmingham | 2025 |
| Alsford Page & Gems (Holdings) Limited | London | 1990 |
| Alsford Page & Gems Ltd | London | 1971 |
| Alshar Group Limited | Ballymena | 2021 |
| Alsim System Building Limited | Hampton | 2022 |
| Alsk Holdings Limited | Newport | 2020 |
| Alskea Holdings Ltd | Dungannon | 2025 |
| Alsl Investments Limited | Trentham | 2017 |
| Also Trading Limited | Manchester | 1969 |
| Also UK Holdings Limited | Reading | 2025 |
| Alsop Wealth Management Limited | Harrogate | 2019 |
| Alsot Limited | Tunbridge Wells | 2003 |
| Alsoven UW Limited | London | 2014 |
| Alsquared Ltd | Hessle | 2025 |
| Alstar Asset Management Limited | Leicester | 2019 |
| Alstar Holdings Ltd | London | 2024 |
| Alster HI Limited | London | 2003 |
| Alstom (Investment) UK Limited | Derby | 2015 |
| Alstom (Litchurch) Limited | Derbyshire | 1983 |
| Alstom Transportation (Global Holding) UK Limited | Derby | 2015 |
| Alstom UK Pension Trustee Limited | Derby | 2014 |
| Alstom UK VP Pension Trustee Limited | Derby | 2014 |
| Alston Group Holdings Limited | Chorley | 2025 |