| Alexander Cousins Limited | Leeds | 2019 |
| Alexander Crickmay Ltd | London | 2019 |
| Alexander Dalton Limited | Huntingdon | 2008 |
| Alexander Data Solutions Ltd | London | 2025 |
| Alexander David Limited | Derby | 2022 |
| Alexander Dawn Ltd | Manchester | 2020 |
| Alexander DE Berniere Group Holdings Limited | London | 2025 |
| Alexander DE Berniere Limited | London | 2025 |
| Alexander DE Sousa Services Ltd | London | 2017 |
| Alexander Design Limited | Winchester | 1997 |
| Alexander Dixon Ltd | London | 2025 |
| Alexander Eccles Limited | Wirral | 1951 |
| Alexander Elliott Limited | Cuffley | 2006 |
| Alexander Family Holdings Ltd. | London | 1997 |
| Alexander Financial Consultancy Ltd | Cwmbran | 2019 |
| Alexander Finn Limited | Oxford | 2006 |
| Alexander FLC Ltd | London | 2026 |
| Alexander Forbes Associates Ltd | Ilford | 2014 |
| Alexander Fraser Holdings Limited | Ottershaw, | 1959 |
| Alexander George Frederick Smith Ltd | Croydon | 2024 |
| Alexander George Ltd | London | 2021 |
| Alexander Geoscience Ltd | London | 2019 |
| Alexander Global Ltd | Swadlincote | 2024 |
| Alexander Goodall Ltd | London | 2016 |
| Alexander GOW Ltd | Blackburn | 2004 |
| Alexander Grant Associates Ltd | Hemel Hempstead | 2012 |
| Alexander Graphics Limited | Maidenhead | 2003 |
| Alexander Greene Limited | Wallington | 2018 |
| Alexander Hearn Team Limited | Cannock | 2012 |
| Alexander Henry Consulting Limited | Swindon | 2012 |
| Alexander Hill Ltd | Knowle | 2006 |
| Alexander Hills Architects Ltd. | London | 2017 |
| Alexander Hobbs Associates Ltd | London | 2017 |
| Alexander Holness Ltd | Stevenage | 2018 |
| Alexander Holt Limited | Glasgow | 2016 |
| Alexander House Business Centre PLC | Aldershot | 1987 |
| Alexander Hughes UK Executive Search Ltd | Farnham | 2020 |
| Alexander Infrastructure Dynamics Ltd | London | 2026 |
| Alexander Investments 2019 Limited | Devizes | 2019 |
| Alexander IPC Ltd | Kington | 2024 |
| Alexander Isaac Consulting Limited | Maidstone | 2018 |
| Alexander J Mcdougall Ltd | Cramlington | 2014 |
| Alexander Jack Group Limited | Halifax | 2019 |
| Alexander Jack Solutions Limited | Leeds | 2021 |
| Alexander Jackson Limited | Sunderland | 2022 |
| Alexander James & Co OIL & GAS Recruitment Ltd | Rayleigh | 2007 |
| Alexander James & Company Limited | Thames Ditton | 2004 |
| Alexander James (Contract Interiors) Limited | Milton Keynes | 2003 |
| Alexander James (Group Services) Ltd | The Drive | 2010 |
| Alexander James (Hotels & Commercial Projects) Ltd | Twyford | 2010 |
| Alexander James Associates Limited | Nr Walton Upon Trent | 2014 |
| Alexander James Consulting Ltd | London | 2026 |
| Alexander James Enterprises Group Ltd | Leicester | 2024 |
| Alexander James Enterprises Ltd | London | 2020 |
| Alexander James Property Services Ltd | Swanscombe | 2025 |
| Alexander James Scott Ltd | Hove | 2017 |
| Alexander Jefferies Ltd | Bexhill On Sea | 2019 |
| Alexander Jewitt & Co. Limited | Northallerton | 2009 |
| Alexander JLO Limited | London | 2013 |
| Alexander JON Compliance Consulting Limited | Hoddesdon | 2019 |
| Alexander JS Limited | Bromley | 2012 |
| Alexander Keenan Notarial Services Limited | Boston | 2016 |
| Alexander Kemp Limited | London | 2022 |
| Alexander Kent Limited | Leatherhead | 2008 |
| Alexander Khabbazi Ltd | Eastbourne | 2026 |
| Alexander Knight & Co Limited | Altrincham | 2012 |
| Alexander Knight Business Solutions Ltd | Colchester | 2010 |
| Alexander Knight Partnership Limited | Birmingham | 2012 |
| Alexander Laird Ltd | Dartford | 2018 |
| Alexander Lansbury Limited | Wickford | 2019 |
| Alexander Lauren Limited | Malton | 2009 |
| Alexander Lawrence Accounting Services Limited | London | 2025 |
| Alexander Lawson & Co Limited | Ashton Road Golborne Warrington | 1930 |
| Alexander Legal Services Limited | North Shields | 2019 |
| Alexander Louise Ltd | London | 2018 |
| Alexander Lowen Limited | Thame | 2026 |
| Alexander Lyons Limited | London | 2009 |
| Alexander Maclaren & Company Limited | London | 1975 |
| Alexander Macleod Limited | Pitlochry | 2016 |
| Alexander MAE Interiors Ltd | London | 2026 |
| Alexander Maitland Ltd | Exeter | 1996 |
| Alexander Mann Group Limited | London | 1998 |
| Alexander Mansell Limited | Farnborough | 2009 |
| Alexander Marcar and Company Limited | Richmond | 1956 |
| Alexander Marine Design Limited | Newport-On-Tay | 2017 |
| Alexander Martin Architects Limited | London | 2013 |
| Alexander Martin International Ltd | Farnham | 2018 |
| Alexander Martin Ltd | Shrewsbury | 2015 |
| Alexander Mechanical Services Ltd | Dundee | 2023 |
| Alexander Mews Meadow Limited | Chelmsford | 1999 |
| Alexander Miles Ltd | Cardiff | 2017 |
| Alexander Moffat & Co WS | Edinburgh | 1999 |
| Alexander MOR & Associates Limited | West Bromwich | 2021 |
| Alexander Murray & Co Limited | Aberdeen | 2010 |
| Alexander Myerson & Co Limited | Liverpool | 2013 |
| Alexander Nicolle Limited | Dronfield | 2011 |
| Alexander Norton Limited | Warrington | 2015 |
| Alexander Oastler Limited | Glasgow | 2004 |
| Alexander Owen Ltd | Newcastle Upon Tyne | 2014 |
| Alexander Park at Louth Management Company Limited | Grimsby | 2019 |