| Alfred Engineering Ltd | London | 2024 |
| Alfred Flett Limited | | 1998 |
| Alfred Foster Rostron Limited | Loughborough | 2011 |
| Alfred Fraser Bathrooms and Tiles Ltd | Manchester | 2015 |
| Alfred Homes Developments Limited | Winchester | 2021 |
| Alfred Homes Limited | Winchester | 2009 |
| Alfred Investment Properties Limited | Winchester | 2022 |
| Alfred Jointing Ltd | London | 2025 |
| Alfred M Building Services Ltd | Reading | 2025 |
| Alfred Maxwell Limited | Hayes | 2025 |
| Alfred Mcalpine Civil Engineering Limited | St Austell | 2024 |
| Alfred Pointing and Restoration Ltd | Romford | 2022 |
| Alfred Properties Ltd. | Keynsham | 2008 |
| Alfred Rigging Ltd | Hayes | 2019 |
| Alfreds Way Investments (NO. 2) Limited | Woodford Green | 1972 |
| Alfrelia Design and Build Limited | London | 2020 |
| Alfresco Air Limited | Barnsley | 2012 |
| Alfresco Canopies Limited | York | 2019 |
| Alfresco Pools Limited | Cranbrook | 2018 |
| Alfresco SD Ltd | London | 2020 |
| Alfresko Ltd | Durham | 2020 |
| Alfreton Electrics Limited | Alfreton | 2013 |
| Alfreton GAS Services Ltd | Heanor | 2019 |
| Alfro Ltd | Hartlepool | 2012 |
| Alfscar Holdings Ltd | Farnham | 2026 |
| Alftec Fabrications Ltd | London | 2006 |
| Alfurat Building Ltd | Bradford | 2025 |
| Alfy Jack Training Limited | Kettering | 2026 |
| ALG Builders Limited | Harrogate | 2016 |
| ALG Coatings Ltd | Kirkcaldy | 2020 |
| ALG Constructions Ltd | Hornchurch | 2015 |
| ALG Contractors Ltd | London | 2021 |
| ALG Decorators Ltd | Isleworth | 2023 |
| ALG Developments Limited | Co.Tyrone | 1985 |
| ALG Drywall Ltd | Rotherham | 2025 |
| ALG Fire Ltd | London | 2022 |
| ALG GAS Plumbing and Heating Limited | Cardiff | 2019 |
| ALG GAS Services Ltd | Dundee | 2019 |
| ALG Group Holdings Limited | Nottingham | 2022 |
| ALG Heating Ltd | Gateshead | 2019 |
| ALG Home Improvements Ltd | Carshalton | 2014 |
| ALG Roofing Limited | Milford Haven | 2022 |
| ALG Solutions Limited | | 2001 |
| ALG Watford Ltd | Borehamwood | 2021 |
| Algack for Trade Ltd | Harrogate | 2024 |
| Algae & Algae Holding Ltd | London | 2020 |
| Algain Limited | London | 2016 |
| Algar (Electric Motors) Limited | Eynsham Witney | 1978 |
| Algar Consultants Limited | London | 2025 |
| Algar Groundworks Limited | Swansea | 2015 |
| Algarose Limited | London | 2025 |
| Algarve Construction Ltd | Northwood | 2020 |
| Algarve Living Ltd | Keighley | 2016 |
| Algas Air Compressors & Maintenance Limited | Dumbarton | 2022 |
| Algas Heating & Plumbing Limited | Brighton | 2003 |
| Algas Medical Installations (North East) Ltd | North Shields | 2020 |
| Algas Medical Installations Limited | Dumbarton | 2005 |
| Algas Services Ltd | Colchester | 2020 |
| Alge Ltd | London | 2017 |
| Algebra (Dundonald) Limited | Glasgow | 2006 |
| Algek Flooring Limited | Newmarket | 2006 |
| Algeonix Ltd | Slough | 2024 |
| Alger Developments Ltd | Bolton | 2025 |
| Alger Electrics and Alarms Limited | Dumbarton | 1992 |
| Alger Electrics Ltd | Dumbarton | 2020 |
| Algeti Limited | London | 2018 |
| Alghannoum Limited | London | 2019 |
| Algirdas Construction Limited | Ilford | 2025 |
| Algiz Scaffolding Ltd | Wokingham | 2024 |
| Algo (Blairgowrie) Limited | Perth | 1996 |
| Algo AV Limited | Glasgow | 2024 |
| Algocalmin Ltd | Bedford | 2022 |
| Algom Property Limited | London | 2015 |
| Algoma Safety Ltd | Orpington | 2017 |
| Algonquin Developments Limited | Felixstowe | 2020 |
| Algor Construction Ltd | London | 2023 |
| Algord Limited | Southend On Sea | 2016 |
| Algovers Ltd | West Drayton | 2025 |
| Algra Plumbing & Heating Ltd. | Aberdeen | 2007 |
| Algri Services Limited | Pinner | 2025 |
| Algriim Ltd | London | 2025 |
| Algroup (NW) Ltd | Manchester | 2020 |
| Algroup Window Installation Ltd | Manningtree | 2018 |
| Algs Property Group Ltd | Nottingham | 2026 |
| Algy Group Ltd | Birmingham | 2022 |
| ALH Builders Ltd | York | 2012 |
| ALH Estates Limited | London | 2011 |
| ALH Groundworks Limited | Wakefield | 2013 |
| ALH Hartlepool Limited | Hartlepool | 2024 |
| ALH Inclusive Solutions Limited | Manchester | 2025 |
| ALH Maintenance Services Limited | Sheffield | 2018 |
| ALH Ohana Ltd | Heathfield | 2022 |
| ALH Plumbing and Heating Ltd | Nottingham | 2017 |
| ALH Property Maintenance Limited | Tring | 2020 |
| ALH Timber Framing Limited | Eastbourne | 2019 |
| Alh-Shonibare Limited | Coventry | 2023 |
| Alhajjaj for Trade Ltd | London | 2024 |
| Alhalabi Limited | London | 2017 |
| Alhalool Limited | Hounslow | 2021 |
| Alhamdani Consultants Limited | Leeds | 1994 |