| Alaska Clarke Limited | London | 2022 |
| Alasow Surveyors Ltd | London | 2026 |
| Alaspor Limited | Bolton | 2023 |
| Alassaf Brothers Portfolio Management Limited | London | 2016 |
| Alassio Ltd | Mildenhall | 2012 |
| Alastair Binnie Architecture & Environment Ltd | London | 2026 |
| Alastair Burns & Co Ltd. | Horsham | 1998 |
| Alastair Campbell and Company Limited | Edinburgh | 1901 |
| Alastair Coey Architects Ltd | Belfast | 2010 |
| Alastair Currill Photography Ltd | Moreton-In-Marsh | 2023 |
| Alastair Forbes Architects Limited | Dunblane | 2020 |
| Alastair Frith Wealth Management (IFA) Limited | Reading | 2014 |
| Alastair Fyfe Photography Limited | London | 2010 |
| Alastair Henderson Landscape and Garden Design Ltd | London | 2020 |
| Alastair Hill Associates Limited | Maidenhead | 2004 |
| Alastair James Consulting Ltd | London | 2018 |
| Alastair Levy Advisory Ltd | Crawley | 2024 |
| Alastair Machray Media Consulting Ltd | Liverpool | 2020 |
| Alastair Macintyre Business Coaching Ltd | Hindhead | 2025 |
| Alastair Mackie Ltd | Harrogate | 2017 |
| Alastair Mcivor Training Limited | Maidenhead | 2009 |
| Alastair Mckillop Accountancy and Taxation | Ballymena | 2015 |
| Alastair Meldrum Limited | Wrexham | 2018 |
| Alastair Merrill Limited | Slough | 2013 |
| Alastair Noyce Ltd | Hamilton | 2020 |
| Alastair Sanderson Consulting Limited | Neston | 2025 |
| Alastair Sawday Publishing Co. Ltd | Bristol | 1993 |
| Alastair SIM Consultancy Ltd | Edinburgh | 2025 |
| Alastair Soane Consulting Limited | Liverpool | 2003 |
| Alastair Walmsley Consulting Limited | Manchester | 2004 |
| Alastair White Consultancy Ltd | Aboyne | 2020 |
| Alastair Wood Accs Ltd | Kington | 2006 |
| Alastair Woodruff Ltd | North Shields | 2007 |
| Alastair Young Limited | Hook | 2013 |
| Alastone Consultancy Limited | Bexleyheath | 2024 |
| Alastor Asset Management Ltd | London | 2019 |
| Alastor Case Management Ltd | Rosudgeon | 2022 |
| Alastor Fiduciary & Probate Ltd | Ingatestone | 2019 |
| Alat Accounting Services Limited | Swindon | 2023 |
| Alatar Ltd | Fareham | 2023 |
| Alatco Limited | Stourbridge | 2023 |
| Alate Business Growth Ltd | Oxford | 2018 |
| Alathe Investments Limited | Glasgow | 2012 |
| Alati Ltd | London | 2020 |
| Alatis Solutions Ltd | Westhill | 2022 |
| Alatopipero Limited | Sunderland | 2026 |
| Alator Capital Ltd | London | 2021 |
| Alator Consultants Ltd | Kirkcaldy | 2014 |
| Alator Data Services Ltd | Dundee | 2020 |
| Alator Limited | Salisbury | 2022 |
| Alatrac Ltd | Bury St. Edmunds | 2025 |
| Alatt Engineering Solutions Ltd | Corby | 2026 |
| Alatus Corporate Advisory Ltd | London | 2022 |
| Alatus Ltd | London | 2025 |
| Alatus Management Ltd | Burgess Hill | 2016 |
| Alatus Services Ltd | London | 2026 |
| Alauda Consulting Limited | Oxford | 2021 |
| Alauda Natural Capital Limited | Chorley | 2026 |
| Alauna Safety Solutions Limited | Altrincham | 2024 |
| Alauren Limited | Wolverhampton | 2024 |
| Alavon Consultants Ltd. | Northolt | 2025 |
| Alaw Accounting Limited | Bedford | 2025 |
| Alaw CYF. | Ruthin | 2021 |
| Alawaba Management Limited | Croydon | 2005 |
| Alawco Limited | Cambridge | 2021 |
| Alaya Consultants Ltd | Romford | 2021 |
| Alayd Ltd | London | 2023 |
| Alayna Cullen Ltd | Saffron Walden | 2018 |
| Alayna Tech Ltd | Birmingham | 2021 |
| Alazid Limited | Guildford | 2025 |
| Alazrak 2 Engineering Consultancy Ltd | Doncaster | 2014 |
| ALB Accountancy Services Ltd | Broadstairs | 2024 |
| ALB Accounting Ltd | London | 2010 |
| ALB Accounting Services Ltd | Burntwood | 2022 |
| ALB Advisory and Consulting Ltd | Wallington | 2026 |
| ALB Advisory Ltd | London | 2007 |
| ALB Associates Limited | Bath | 2007 |
| ALB Business Consulting Limited | Stowmarket | 2022 |
| ALB Consultancy Ltd | London | 2022 |
| ALB Consultant Limited | Manchester | 2025 |
| ALB Consulting Ltd | Coatbridge | 2024 |
| ALB Consults Ltd | Harrow | 2025 |
| ALB Energy Surveys Limited | Bath | 2010 |
| ALB Financial Accounting Ltd | Hyde | 2024 |
| ALB Immigration Advice Ltd | Bristol | 2022 |
| ALB Legal Services Limited | Leeds | 2014 |
| ALB Management Consulting Ltd | London | 2023 |
| ALB Management Services Ltd | Royston | 2025 |
| ALB Media Group Ltd | London | 2017 |
| ALB Peterson Ltd | Barking | 2019 |
| ALB Social Limited | Liverpool | 2026 |
| ALB Solutions Limited | London | 2026 |
| ALB Tax Ltd | London | 2013 |
| ALB UK Consultancy Ltd | London | 2021 |
| ALB Ventures Ltd | Leeds | 2023 |
| ALB0X Subsea Ltd | Rugby | 2022 |
| ALB2 Ltd | Princes Risborough | 2025 |
| Alba Business Initiative Limited | Mauchline | 2016 |
| Alba Construct Ltd | Edinburgh | 2023 |
| Alba Ecology Limited | Grantown-On-Spey | 2005 |