| A Danials Limited | London | 2026 |
| A Dapper Company Ltd | London | 2018 |
| A Daraban Design Engineering Ltd | Wellingborough | 2019 |
| A Dash of Design Limited | London | 2021 |
| A Davidson & Associates Limited | Manchester | 1991 |
| A Davies Laboratories Ltd | Bembridge | 2015 |
| A Davies Mechanical Engineering Services Ltd | Brierley Hill | 2023 |
| A Davy Consulting Limited | Leeds | 2022 |
| A DE Berniere Group Holdings Limited | London | 2025 |
| A DE Berniere Limited | London | 2025 |
| A Decor Story Ltd | London | 2025 |
| A Dedicated Studio Ltd | London | 2026 |
| A Dennett Services Ltd | Runcorn | 2019 |
| A Denny Partners Ltd | Harpenden | 2025 |
| A Design & Engineering Consultancy Ltd | Ashby De La Zouch | 2021 |
| A Design Collective Limited | London | 2026 |
| A Design Studio Limited | Ilford | 2015 |
| A Designer at Heart Ltd | London | 2018 |
| A Developments Ltd | Bradford | 2023 |
| A DEY Finance Limited | Birmingham | 2012 |
| A Dhall Consulting Limited | Birmingham | 2021 |
| A Different Animal Ltd | Lichfield | 2020 |
| A Different Corner Ltd | London | 2017 |
| A Different Lenz Ltd | North Harrow | 2019 |
| A Different Perspective Agency Ltd | Brinkworth | 2023 |
| A Different Sky Limited | Sowerby Bridge | 2025 |
| A Different View Limited | Bawdeswell Dereham | 2001 |
| A Different Way Ltd | London | 2025 |
| A Digital Edge Limited | Dorchester | 2014 |
| A Direction Limited | Peterlee | 2023 |
| A Disguisery Limited | London | 2014 |
| A Dixon Consulting Limited | Sevenoaks | 2018 |
| A Dixons Projects Ltd | Wilmslow | 2025 |
| A Doctrove Consulting Limited | Hassocks | 2026 |
| A Double a Ltd | Salford | 2024 |
| A Downing Limited | Banstead | 2006 |
| A Downs Consulting Limited | Bromsgrove | 2017 |
| A Doyle Forensic Support Ltd | Liverpool | 2017 |
| A Dozen Communications Limited | London | 2003 |
| A Drew Consulting Ltd | Bath | 2021 |
| A Driscoll Consulting Limited | Bromley | 2022 |
| A Duckworth Ltd | Cambridge | 2020 |
| A Dunlop Consulting Limited | Hamilton | 2012 |
| A Dyer Limited | Luton | 2014 |
| A E 2 Limited | Bolton | 2022 |
| A E C C Enterprises Ltd | | 1999 |
| A E Chubb Limited | Eastleigh Southampton | 2002 |
| A E Degutyte Ltd | Chatham | 2023 |
| A E Fleming Ltd | Doncaster | 2015 |
| A E Flooring Services Limited | Northwich | 2012 |
| A E G Water Solutions Limited | Haltwhistle | 2008 |
| A E Geospatial Services Ltd | Belfast | 2023 |
| A E H Associates Ltd | Ely | 2011 |
| A E Houghton & SON Limited | York | 2003 |
| A E Huntbach Co Limited | Bristol | 2001 |
| A E J Financial Limited | Altrincham | 2023 |
| A E L Access Limited | Hull | 2025 |
| A E Mechanical Services Limited | Inverurie | 2018 |
| A E Medicolegal Limited | London | 2003 |
| A E Paterson Ltd | Cardiff | 2019 |
| A E R Rowe Financial Consulting Limited | Calne | 2016 |
| A E S Cables Ltd | Chatham | 2005 |
| A E S Solar Ltd. | Forres | 2003 |
| A E Scott & Co Limited | Stockton-On-Tees | 2013 |
| A E Surveyors Limited | Nottingham | 2023 |
| A E Worthington Ltd | Preston | 2025 |
| A Ephgrave Limited | Henlow | 2024 |
| A Etcetera Ltd | London | 2022 |
| A Etherington Ltd | Carlisle | 2025 |
| A Eureka Moment Limited | Northampton | 2019 |
| A Everett Haulage Limited | Wimborne | 2002 |
| A Everitt Limited | Leigh-On-Sea | 2013 |
| A F a Consulting Ltd | Lightwater | 2020 |
| A F a H Holdings Limited | Farnham | 2019 |
| A F Accounting Limited | Bristol | 2017 |
| A F B Digital Ltd | Sleaford | 1999 |
| A F Brooks Limited | Cardiff | 2014 |
| A F Bruce Engineering Limited | Elgin | 2011 |
| A F Companies Ltd | Huddersfield | 2025 |
| A F Contracts Ltd | Glasgow | 2020 |
| A F Ducas Surveyors Ltd | London | 2018 |
| A F Fergusons Ltd | Romford | 2023 |
| A F H Consultancy Limited | St. Albans | 2013 |
| A F Hill Ltd | London | 2011 |
| A F Layland Process Solutions Ltd | Burton On Trent | 2024 |
| A F M Financial Reporting and Consulting Limited | Ilford | 2013 |
| A F Macarthur Consultancy Ltd | Linlithgow | 2024 |
| A F O'Connor Consulting Limited | St. Albans | 2017 |
| A F Ring Consultancy Limited | London | 2018 |
| A F Sanders Limited | Wolverhampton | 2019 |
| A F Sullivan Ltd | London | 2026 |
| A Fabbroni Inspection Ltd | Bradford | 2015 |
| A Fairclough Ltd | Sale | 2025 |
| A Family Affair Ltd | London | 2025 |
| A Family Office Ltd | London | 2023 |
| A Fantastic Racket Limited | Brighton | 2024 |
| A Father's Friend Limited | Scarborough | 2021 |
| A Fatuga Ltd | London | 2016 |
| A Felton Services Ltd | Reading | 2020 |
| A Ferguson Associates Ltd | Bournemouth | 2016 |