| Akselberg VC Partners Ltd | London | 2018 |
| Akselos Limited | London | 2018 |
| Aksense Ltd | London | 2019 |
| Aksent Limited | Watford | 2016 |
| Aksential Limited | London | 2025 |
| Akses Global Limited | Dartford | 2020 |
| Aksess Ltd | Surrey | 1989 |
| Aksha Advisors Ltd | London | 2026 |
| Akshar Accountants & Company Limited | Harrow | 2016 |
| Akshar Associates Ltd | London | 2025 |
| Akshar Business Services Limited | Borehamwood | 2021 |
| Akshar Capital Limited | Wembley | 2021 |
| Akshar Consultants Ltd | Gerrards Cross | 2012 |
| Akshar Group Services Limited | Harrow | 2024 |
| Akshar Pharma Services Ltd | Harrow | 2016 |
| Akshar Technologies Ltd | Witham | 2012 |
| Akshara Designs Ltd | Feltham | 2026 |
| Akshara Living Ltd. | Cowbridge | 2015 |
| Akshay Management Services Limited | Middlesex | 2002 |
| Akshay Urja Engineers Ltd | London | 2021 |
| Akshaya and Co Accountants Limited | Orpington | 2017 |
| Akshaya Ratan Talent Ltd | Manchester | 2025 |
| Akshaya Vasu UK Limited | Croydon | 2026 |
| Akshi Limited | Ruislip | 2015 |
| Aksia Nominees Limited | Stourbridge | 2005 |
| Aksint Ltd | London | 2022 |
| Aksons Accounting Services Ltd | Bradford | 2020 |
| Aksons Group Ltd | Accrington | 2019 |
| Aksot Industrials Limited | Romford | 2019 |
| Aksoy HR Consultancy Ltd | London | 2019 |
| Akssai Ltd | London | 2022 |
| Aksu Financial Consultancy Ltd | Bournemouth | 2021 |
| Aksu Media Consultancy Ltd | London | 2021 |
| Aksutec Engineering & Consultancy Ltd | London | 2022 |
| Aksv Ltd | Gillingham | 2025 |
| Aksward Limited | Oxford | 2005 |
| Akswind Limited | Ardrossan | 2024 |
| AKT (UK) Limited | Blackburn | 2010 |
| AKT Consultancy Ltd | Salford | 2026 |
| AKT Consultants Limited | Leicester | 2005 |
| AKT Consulting Limited | Barnet | 2019 |
| AKT Health Communications Ltd | Slough | 2018 |
| AKT II Limited | London | 2011 |
| AKT Management Limited | Sutton Coldfield | 2020 |
| AKT Party Wall Surveyors Limited | Harrow | 2016 |
| AKT Syntages Ltd | Glasgow | 2024 |
| AKT Ventures Ltd | Colchester | 2020 |
| Akta PR Limited | London | 2021 |
| Akta Ventures Ltd | London | 2020 |
| Aktas Accountancy Services Limited | London | 2019 |
| Aktas IP Limited | London | 2026 |
| Aktasandco Limited | London | 2023 |
| Aktc Limited | Spalding | 2020 |
| Aktech Engineering Limited | Manchester | 2026 |
| Aktemur Limited | Bromley | 2021 |
| Akteq Limited | Hull | 2022 |
| Aktineum Limited | Brighton | 2024 |
| Aktis Ltd | East Sussex | 2006 |
| Aktius Ltd | Poole | 2013 |
| Aktiv Accounts Limited | Ripley | 2006 |
| Aktiv Consultancy Ltd | Milton Keynes | 2021 |
| AKTIV8 Management Limited | Coventry | 2002 |
| Aktiva-Consulting Limited | Wigan | 2015 |
| Aktive Fire Design Limited | Wakefield | 2022 |
| Aktive ID Consulting Ltd | Maidstone | 2023 |
| Aktivus Limited | Windsor | 2010 |
| Aktm Consulting Ltd | London | 2025 |
| Aktogen Limited | Huntingdon | 2003 |
| Akton Boundrie Group Limited | Stratford-Upon-Avon | 2024 |
| Akton Fire Ltd | London | 2026 |
| Aktrad Limited | Aberdeen | 2001 |
| Aktrion Group Limited | Telford | 2000 |
| Aktrion Holdings Limited | Telford | 2004 |
| Aktrion Manufacturing Support Services Limited | Telford | 1997 |
| Aktt Ltd | Enfield | 2015 |
| Aktuarial Consulting Ltd | Redhill | 2009 |
| Aktuel Translations UK Limited | Henley-On-Thames | 2014 |
| Akturkon Ltd | Cirencester | 2016 |
| Aktv Limited | Watford | 2016 |
| Aktyv Sports Ltd | Maidenhead | 2026 |
| AKU Shika Ltd | Watford | 2022 |
| AKU Training Ltd | Belfast | 2014 |
| Akua Creative Limited | London | 2021 |
| Akua Textiles Ltd | Bury St. Edmunds | 2024 |
| Akuarium Limited | Gloucester | 2023 |
| Akube Ltd | Sheffield | 2020 |
| Akuila Borisi Ltd | Newton Aycliffe | 2025 |
| Akujo Financials Ltd | London | 2020 |
| Akuko Studio Ltd | Thornton Heath | 2025 |
| Akuma Finance Limited | Heckmondwike | 2018 |
| Akumen Associates Limited | Birkenhead | 2010 |
| Akumen Business Solutions & Services Ltd | London | 2008 |
| Akumen Consulting Ltd | Stoke-On-Trent | 2024 |
| Akumen Labs Ltd | London | 2025 |
| Akumwah Media Ltd | London | 2025 |
| Akun Ltd | Hornchurch | 2017 |
| Akuna Bay Ltd | Renfrew | 2022 |
| Akuni Limited | Newcastle Upon Tyne | 2014 |
| Akunoshi Advertising Ltd | London | 2025 |
| Akura IT Services Ltd | Ilford | 2024 |