| After Dark Investment Limited | Abingdon | 2001 |
| After Each Click Ltd | London | 2026 |
| After Exploitation Ltd | London | 2020 |
| After Hours Accountants Ltd | Reading | 2024 |
| After Hours Agents Ltd | Bristol | 2025 |
| After Hours Social Limited | Middlesbrough | 2023 |
| After Image Limited | Fordingbridge | 1984 |
| After Loss Partners Ltd | Ash Green | 2025 |
| After My Limited | Hitchin | 2024 |
| After New Ltd | Nottingham | 2022 |
| After Nyne Consulting Ltd | Lewes | 2016 |
| After Ruby Ltd | Selby | 2022 |
| After Shot Media Ltd | Carlisle | 2023 |
| After Solstice Limited | London | 2025 |
| After the Circus Ltd | London | 2014 |
| After the Click Ltd | Hull | 2024 |
| After the Event Limited | London | 2003 |
| After the FOX Ltd | Sheffield | 2024 |
| After Today Partnership (Norfolk) Limited | Kings Lynn | 1994 |
| After Tuesday Ltd | London | 2004 |
| After Yellow Ltd | London | 2024 |
| After-Hours Management Ltd | Manchester | 2025 |
| Afterathena Limited | Preston | 2004 |
| Aftercare Consultants Ltd | Liverpool | 2017 |
| Afterglow Creative Ltd | London | 2021 |
| Afterglow Interactive Ltd | Grimsby | 2025 |
| Afterglow Plumbing & Heating Limited | Birmingham | 2015 |
| Afterglow Weddings Ltd | Glasgow | 2024 |
| Afterhoursproduction Ltd | London | 2025 |
| Afterimage Creative Limited | Colchester | 2023 |
| Afterimagery Ltd | Dolgellau | 2026 |
| Afterlyfe Ltd | Slough | 2025 |
| Aftermap Ltd | Hatfield | 2022 |
| Aftermarket Advocates Ltd | Holmfirth | 2016 |
| Aftermarket Logistic Services Ltd | Surrey | 2004 |
| Afternoon London Ltd | London | 2024 |
| Aftershots Ltd | Glasgow | 2009 |
| Aftersure Limited | Harlow | 2025 |
| Afterthought Limited | London | 2025 |
| Aftertouch Limited | London | 2008 |
| Afterus Advisory Ltd | Bristol | 2026 |
| Afterwords Limited | Newcastle Upon Tyne | 2024 |
| Afton & Mackenzie Payroll Ltd | Fraserburgh | 2022 |
| Afton Cooper Limited | Berks | 1901 |
| Aftreefonds Limited | Scunthorpe | 2019 |
| Aftt Consultancy Ltd | Abergavenny | 2025 |
| AFU China Journeys Limited | London | 2026 |
| AFU Holdings Ltd | Glasgow | 2024 |
| Afua Serwaah Consultancy Ltd | London | 2023 |
| Afure Limited | London | 2018 |
| Afvk Consulting Ltd | Harpenden | 2024 |
| AFW Engineering (Scotland) Limited | Hamilton | 2024 |
| AFW Engineering Services Ltd | Milton Keynes | 2023 |
| AFW Finance 2 Limited | Knutsford | 2015 |
| AFW Legal Consultancy Ltd | Stockport | 2021 |
| AFW Marketing Ltd | Milton Keynes | 2025 |
| Afwan Ltd | Liverpool | 2025 |
| Afwhite Consulting Limited | London | 2023 |
| Afwli Ltd | Edinburgh | 2021 |
| Afxon Limited | London | 2018 |
| Afya Global Ltd | Chippenham | 2012 |
| Afya Limited | Chatham | 2022 |
| Afya Partners Ltd | London | 2024 |
| AFZ Accountancy Limited | Salford | 2013 |
| Afzal Immigration Limited | Middlesbrough | 2025 |
| Afzm S.A Elahi Logistics Ltd | Ilford | 2022 |
| Afzmak Ltd | Hemel Hempstead | 2024 |
| Afzol Hussain Ltd | London | 2023 |
| AG & JG Consulting Limited | Ipswich | 2018 |
| AG Access Limited | Carlisle | 2023 |
| AG Accountancy Ltd | Saltash | 2020 |
| AG Accountant Ltd | Reading | 2018 |
| AG Accounting & Bookkeeping Ltd. | Aberystwyth | 2017 |
| AG Accounting Solutions Ltd | Greenford | 2018 |
| AG Additive Manufacturing Ltd | Towcester | 2020 |
| AG Advisors Ltd | London | 2009 |
| AG Advisory Associates Ltd | Lynch Wood, Peterborough | 2017 |
| AG Advisory Ltd | Beckenham | 2026 |
| AG Advisory Services Ltd | Woodford Green | 2021 |
| AG Alltech Limited | Arbroath | 2019 |
| AG and Co Solicitors Ltd | Chigwell | 2024 |
| AG Animal Services Limited | Droitwich | 2021 |
| AG Arboriculture Limited | Waterlooville | 2024 |
| AG Architectural Solutions Ltd | Stockport | 2014 |
| AG Architecture Limited | Solihull | 2011 |
| AG Associates Corp Limited | London | 2012 |
| AG BA Services Ltd | Rotherham | 2022 |
| AG Bartlett Consultancy Ltd | Ashford | 2025 |
| AG Bookkeeping Services Ltd | Worthing | 2018 |
| AG Bookkeeping UK Ltd | Plymouth | 2025 |
| AG Business Consultancy Ltd | Gloucester | 2024 |
| AG Business Services Ltd | Basildon | 2023 |
| AG Business Solutions Ltd | Stafford | 2021 |
| AG Capital Ltd | Omagh | 2019 |
| AG Capital Partners Ltd | Edgware | 2024 |
| AG Collaboration Full Service Marketing Limited | Slough | 2017 |
| AG Collaborative Limited | Ilkley | 2023 |
| AG Commercial Consultants Ltd | Ruislip, | 2024 |
| AG Commercial Finance Ltd | London | 2025 |
| AG Completion Services Limited | Harlow | 2021 |