| Alfren Ltd | London | 2025 |
| Alfresco Concepts Holdings Limited | Winchester | 2021 |
| Alfresco Design Associates Limited | Warwickshire | 1997 |
| Alfresco Lighting Designs Limited | Colchester | 2023 |
| Alfresco Projects Ltd | Newcastle Upon Tyne | 2023 |
| Alfreton Accountants Limited | Alfreton | 2014 |
| Alfreton Insurance Services (Holdings) Limited | Alfreton | 2014 |
| Alfriston Consulting Limited | Eastbourne | 2021 |
| Alfs London Limited | London | 1998 |
| Alfson Consultancy Limited | Horsham | 2008 |
| Alftan Limited | London | 2024 |
| Alfur Accountancy Limited | Gillingham | 2020 |
| Alfurpop Limited | Gillingham | 2025 |
| Alfurqan Developers Ltd | Middlesbrough | 2019 |
| Alfy Traders Ltd | Edinburgh | 2021 |
| ALG Accounting Limited | Coventry | 2018 |
| ALG Communications Limited | Chertsey | 2014 |
| ALG Consult Limited | London | 2021 |
| ALG Consulting Services Limited | Guildford | 2015 |
| ALG Industrial Limited | Rochdale | 2025 |
| ALG Inspection Limited | Glenrothes | 2013 |
| ALG Limited | London | 2023 |
| ALG Management Limited | London | 2020 |
| ALG Procon Services Ltd. | Watford | 2017 |
| ALG Racing Limited | Swansea | 2008 |
| ALG Sports Consultancy Ltd. | Falkirk | 2026 |
| ALG Strategy Consultants Ltd | Leigh-On-Sea | 2022 |
| Alga Global Ltd | London | 2023 |
| Alga Ltd | Southampton | 2017 |
| Algacraft Ltd | Edinburgh | 2019 |
| Algae & Algae Technologies Ltd | London | 2020 |
| Algae Products Limited | Templepatrick | 2012 |
| Algae Research Ltd | Altrincham | 2020 |
| Algae Saves the World, Consulting Ltd | Cardigan | 2017 |
| Algae Scope Ltd | Letchworth Garden City | 2023 |
| Algaecytes CPM Limited | Canterbury | 2017 |
| Algaecytes Limited | Canterbury | 2010 |
| Algafy Limited | London | 2013 |
| Algagrove Limited | London | 1970 |
| Algal Works Limited | Brentwood | 2017 |
| Algamy Limited | Oban | 2025 |
| Alganutri International Limited | London | 2017 |
| Alganys Limited | London | 2017 |
| Algaplex Limited | Wilmslow | 2014 |
| Algaq Ltd | London | 2025 |
| Algar Holding Limited | London | 2019 |
| Algar Limited | Lytham St. Annes | 2022 |
| Algar Seco Limited | Bicester | 2018 |
| Algarhythm Biotech Ltd | Stratford-Upon-Avon | 2025 |
| Algarva Finance Solution Limited | London | 2016 |
| Algarve Consulting Ltd | London | 2026 |
| Algarve Properties Limited | Maidstone | 1984 |
| Algarve Property Site Ltd | Bolton | 2014 |
| Algarve Select Limited | Alderley Edge | 1990 |
| Algasem Company Limited | Manchester | 2015 |
| Algate Global Ltd | Nottingham | 2013 |
| Algate Walker Limited | Stockport | 2021 |
| Algc Holdings Limited | London | 2021 |
| Alge Pathways Limited | Wakefield | 2026 |
| Algebra (Newco) Limited | London | 2008 |
| Algebra Business Consultancy Ltd | New Milton | 2009 |
| Algebra Consulting Limited | Warwick | 2022 |
| Algebra Digital Limited | London | 2018 |
| Algebraic Technologies Ltd | Glasgow | 2022 |
| Algebris (UK) Limited | London | 2016 |
| Algeco Storage Holdings Limited | Stockton-On-Tees | 2006 |
| Algenuity Holdings Ltd | Bedford | 2020 |
| Algenuity Limited | Bedford | 2020 |
| Algerie Motors Ltd | Sevenoaks | 2019 |
| Algerino the Jeweller Ltd | London | 2024 |
| Algernas Printing & Documents Clearing Services UK Limited | Morden | 2024 |
| Algernon Consulting Limited | London | 2011 |
| Algesiras Limited | Walton-On-Thames | 2024 |
| Algex Limited | London | 2013 |
| Algimayn Ltd | Banbridge | 2019 |
| Algimi Limited | London | 2017 |
| Alginon Limited | Shoreham-By-Sea | 2023 |
| Algiplex Ltd | Milford On Sea | 2025 |
| Algiz Consulting Limited | London | 2022 |
| Algiz Limited | Hamilton | 2001 |
| Algl Management Limited | Glasgow | 2025 |
| Alglotech Ltd | London | 2009 |
| Algn Advisory Ltd | London | 2024 |
| Algo Consulting Ltd | Barnstaple | 2009 |
| Algo Equities Technology Ltd | London | 2023 |
| Algo Group Ltd | Warwick | 2025 |
| Algo Limited | Westcliff-On-Sea | 2018 |
| Algo Novo Limited | Reigate | 2019 |
| Algo Quants Ltd | London | 2019 |
| Algo Rank Digital Ltd | London | 2025 |
| Algo Sports Ltd | London | 2026 |
| Algoa Engineering Services Limited | Aberdeen | 1997 |
| Algoco Ltd | London | 2025 |
| Algocom Ltd | Belfast | 2024 |
| Algodon Engineering Limited | Edgware | 2019 |
| Algolabs Ltd | Bracknell | 2022 |
| Algom Ltd | London | 2014 |
| Algomarketing Ltd | London | 2016 |
| Algoquant Consulting Limited | London | 2018 |
| Algoraze Limited | Leicester | 2025 |