| Alexib Investments | Weybridge | 2026 |
| Alexis Sikorsky Holdings Ltd | Walton-On-Thames | 2026 |
| Alexol One Limited | Norwich | 2005 |
| Alexsa Investments Limited | Ashford | 2019 |
| Alexshara Group Brands Limited | Manchester | 2017 |
| Alexum Group Limited | Manchester | 2020 |
| ALF Alpha Limited | Guildford | 2025 |
| ALF Holdings Limited | Belfast | 2020 |
| ALF Kitching Holdings Ltd | Scunthorpe | 2024 |
| ALF Property Ltd | Glasgow | 2024 |
| Alfa ACL Limited | Leicester | 2015 |
| Alfa Chemicals Group Limited | Bracknell | 2019 |
| Alfa Commodities Limited | London | 2012 |
| Alfa Company Investments Limited | Penryn | 2013 |
| Alfa Financial Management Limited | Manchester | 2012 |
| Alfa Financial Software Group Limited | London | 2012 |
| Alfa Five Securities Limited | New Malden | 2015 |
| Alfa Global Holdings Ltd | London | 2026 |
| Alfa Holiday Group Limited | Chorley | 2015 |
| Alfa Industrial Group Ltd | Manchester | 2021 |
| Alfa Investimentos Ltd | Thornton-Cleveleys | 2026 |
| Alfa Money Ltd | London | 2025 |
| Alfa Mortgages Limited | Northampton | 2023 |
| Alfa Star Global Holdings Ltd. | Cardiff | 2022 |
| Alfa Strategies Ltd | Bromley | 2019 |
| Alfa TAU Holdings Ltd | London | 2018 |
| Alfa Wealth Ltd | London | 2025 |
| ALFA8 Coliq Limited | London | 2024 |
| ALFA8 Investments Limited | London | 2024 |
| Alfaco Partners Limited | London | 2018 |
| Alfadhli Holdings Ltd | Harrow | 2026 |
| Alfassa Holdings Ltd | Stevenage | 2019 |
| Alfauld Holdings Ltd | Staffordshire | 2006 |
| Alfaz Partners Ltd | London | 2024 |
| Alfenry Holdings Limited | Cramlington | 2016 |
| Alfi Nova PLC | Loughton | 2021 |
| Alfie Holdings Limited | London | 2017 |
| Alfie Noakes Limited | Halifax | 2013 |
| Alfie Scott Consulting Limited | Bexley | 2021 |
| Alfieco Holdings Limited | Birmingham | 2024 |
| Alfiere Immobiliare Ltd | London | 2025 |
| Alfinas Alternative Capital Advisers Ltd | London | 2023 |
| Alfinco Limited | London | 2018 |
| Alfmya Group Limited | Wakefield | 2024 |
| Alford Family Holdings Limited | Trowbridge | 2026 |
| Alford Property Holdings Limited | Trowbridge | 2016 |
| Alford Technology Group Limited | Trowbridge | 2017 |
| Alfred Austin Holdings Ltd | Sevenoaks | 2014 |
| Alfred Blackmore & Co (Scotland) Limited | | 1985 |
| Alfred Cover Limited | Witney | 2025 |
| Alfred Daisy Holdings Limited | Belfast | 2010 |
| Alfred Fractal Risk Ltd | Southall | 2026 |
| Alfred Franks & Bartlett Holdings Limited | London | 2013 |
| Alfred Group Holdings Limited | Winchester | 2022 |
| Alfred Henry Corporate Finance Limited | London | 1996 |
| Alfred Holdco Limited | London | 2021 |
| Alfred Property Development Ltd | London | 2023 |
| Alfred Roberts Limited | Leicester | 1992 |
| Alfred Vaughan & Co Limited | Doncaster | 2021 |
| Alfred's Tower Management Limited | Bruton | 2017 |
| Alfresco by Design Ltd | Salford | 2020 |
| Alfresco Investments Holdings Limited | Poole | 2022 |
| Alfresco Lifestyle Holdings Ltd | Stamford | 2025 |
| Alfreton Capital Holdings | Radlett | 2024 |
| Alfreton Capital Management Limited | Radlett | 2010 |
| Alfreton Holdings Limited | Stourbridge | 2011 |
| Alfreton Insurance Services Limited | Alfreton | 1988 |
| Alfreton Properties Ltd | East Grinstead | 2022 |
| Alfreton Road Holdco Limited | London | 2023 |
| Alfreton Road JV Limited | London | 2023 |
| Alftakins Holdings Ltd | Oxford | 2026 |
| ALG Holdings Ltd | Bournemouth | 2018 |
| Algar Estates Limited | Brackley | 2021 |
| Algar Group Limited | Epsom | 2024 |
| Algar Holdings (Kent) Limited | Margate | 2025 |
| Algbra Group Holdings Limited | London | 2024 |
| Algbra International Limited | London | 2025 |
| Algea Group Ltd | Chichester | 2023 |
| Algean Limited | London | 2013 |
| Algebra Holdings Ltd | London | 2023 |
| Algebra Investments Limited | Warwick | 2018 |
| Algebris Investments Group Ltd. | London | 2022 |
| Algebris Investments Holdings Ltd. | London | 2022 |
| Algebris Series 1 Limited | London | 2022 |
| Algebris Strategies Holdco Limited | London | 2023 |
| Alger Investment Company | Barnsley | 2022 |
| Alger Limited | Norwich | 2020 |
| Alger Management, Ltd. | London | 2013 |
| Algihaz Assets Company Limited | London | 2024 |
| Algiz Investments Limited | Birmingham | 2022 |
| Algk & Co Limited | Blackburn | 2017 |
| Algo Corp Ltd | Sandwich | 2017 |
| Algo Holdings Ltd | London | 2024 |
| Algo Trading Group Ltd | London | 2022 |
| Algo Ventures Limited | London | 2023 |
| Algoconcept Holding Limited | Stoke On Trent | 2022 |
| Algomatic Investments Ltd | London | 2018 |
| Algonia Capital Ltd | Shrewsbury | 2025 |
| Algonquin Holdings Ltd | Tonbridge | 2020 |
| Algorand Operations (UK) Ltd | Northampton | 2024 |