| A Grace Limited | Southampton | 2014 |
| A Grade Media Limited | London | 2012 |
| A Grade Solutions Limited | Barking | 2012 |
| A Greener Festival Ltd | Pinner | 2008 |
| A H Audio Limited | London | 2013 |
| A H Custom Decoration Ltd | London Colney | 2023 |
| A H Engineering Solutions Limited | Middlesbrough | 2016 |
| A H Film Management Limited | Ascot | 2009 |
| A H Films Ltd | Uxbridge | 2017 |
| A H Fragrances Ltd | Huddersfield | 2017 |
| A H IP Network Services Limited | Belfast | 2019 |
| A H Mouldings Ltd | St Albans | 2013 |
| A H Services Limited | Halesowen | 2003 |
| A H Tech Ltd | London | 2010 |
| A Hamilton Limited | Nottingham | 1983 |
| A Hammett Limited | Exeter | 2004 |
| A Hand Rises Ltd | London | 2024 |
| A Hand to Hold Ltd | London | 2025 |
| A Happier Year Ltd | Hassocks | 2022 |
| A Happy Human Company Ltd | London | 2025 |
| A Happy Place Christian Ministries Ltd | London | 2013 |
| A Harrison Consultancy Limited | Wrexham | 2022 |
| A Head in the Cloud Agency Ltd | Bristol | 2014 |
| A Healthier Earth Limited | London | 2022 |
| A Hive Mind Ltd | Horsham | 2026 |
| A House IS NOT a Home Ltd | London | 2024 |
| A Howe Comms Limited | Bedlington | 2009 |
| A Hudson Limited | Newton Aycliffe | 2019 |
| A Humble Little Guild Ltd | Rochester | 2018 |
| A Hundred Eighty Degrees Productions Ltd | Mitcham | 2012 |
| A I Consultancy Limited | Birmingham | 2011 |
| A I G Infotech Limited | Iver | 2015 |
| A I K a T E K Ltd | Cheltenham | 2008 |
| A I on Cloud Ltd | Mitcham | 2024 |
| A I Squared Limited | Pinner | 2024 |
| A in Production Ltd | Staines-Upon-Thames | 2025 |
| A J & Michaels Limited | Hemel Hempstead | 2014 |
| A J Batchelor Ltd | Lytham St Annes | 2013 |
| A J Boswell Limited | Berks | 2006 |
| A J Burrows Business Solutions Ltd | Nottingham | 2018 |
| A J Clarke Consulting Ltd | Chesterfield | 2025 |
| A J Colwell Limited | Fleet | 2014 |
| A J Comms Ltd | Wigan | 2016 |
| A J Copson Ltd | London | 2021 |
| A J Davis Limited | Ludgershall | 2014 |
| A J Duncan Consulting Ltd | Beccles | 2015 |
| A J Haines Ltd | London | 2025 |
| A J I Creative Ltd. | Biggar | 2021 |
| A J Intelligence Solutions Ltd | Leeds | 2017 |
| A J Lighting Limited | Sidcup | 2018 |
| A J Parkes Ltd | Milton Keynes | 2024 |
| A J R Audio Limited | Surrey | 2006 |
| A J Railson Ltd | Alnwick | 2009 |
| A J Riley Ltd | Windermere | 2020 |
| A J Ross Media Ltd | Amersham | 2015 |
| A J Simmonds Ltd | Iver | 2021 |
| A J Smith Consultancy Limited | Braintree | 2011 |
| A J Smith Defence Bureau Consultancy Limited | Braintree | 2025 |
| A J Sound Limited | Modbury | 2025 |
| A J Systems Limited | Sheffield | 2011 |
| A J W Consulting Limited | Beverley | 1999 |
| A J Welling Communications Ltd | London | 2017 |
| A J Williams Ltd | Portsmouth | 2016 |
| A J Wright Consulting Limited | Ipswich | 2018 |
| A Jaffri Consultancy Services Limited | Worcester Park | 2018 |
| A Jamieson Ltd | London | 2021 |
| A Jamin Limited | Folkestone | 2022 |
| A Johnston Ltd | Irvinestown | 2017 |
| A Jonker Management Consultants Limited | Southfields | 2011 |
| A K Chadha Ltd | Isleworth | 2024 |
| A K Computer Systems & Consulting Limited | Chesterfield | 1998 |
| A K Computing Ltd | York | 2007 |
| A K I L a S H Limited | Sudbury | 2023 |
| A K IT Consultancy Services Ltd | Pinner | 2020 |
| A K Richards Consulting Ltd | Leighton Buzzard | 2023 |
| A K Rigging Services Ltd | Huddersfield | 2025 |
| A K Software House Ltd | Birmingham | 2011 |
| A K Systems Specialists Limited | | 2006 |
| A Kendall Consulting Ltd | Newbury | 2018 |
| A Kenny Limited | London | 2017 |
| A KEW Consultancy Limited | Leeds | 2015 |
| A Khokhar Consulting Ltd | Derby | 2013 |
| A Killer Next Door Ltd | Bridgend | 2019 |
| A Kind of Space Ltd | Norwich | 2025 |
| A Kingdom in Chaos Ltd | Chepstow | 2024 |
| A Klemens & Associates Limited | London | 1998 |
| A Knight Research Ltd | London | 2022 |
| A Komms Ltd | Alvechurch | 2020 |
| A Krogh Consultancy UK PTE Ltd | London | 2013 |
| A Kumar I.T. Services Limited | Walsall | 2009 |
| A L Byron Ltd | Northwood | 2017 |
| A L Consulting (UK) Limited | Market Harborough | 2001 |
| A L Epstein Associates Ltd | London | 2014 |
| A L Films Limited | | 2006 |
| A L K Services Limited | Wembley | 2017 |
| A L Mouldings Ltd | St Albans | 2013 |
| A L Production Services Ltd | Harrogate | 2022 |
| A L W Scenery Ltd | St Albans | 2015 |
| A Labour of Giants Ltd | Taunton | 2013 |
| A Large Company Ltd | London | 2026 |