| Abood Music Limited | London | 2001 |
| Abordo Ltd | Ashton-Under-Lyne | 2014 |
| Aborthwick Ltd | Ballymoney | 2025 |
| Abos IT Services Ltd | Ware | 2017 |
| Aboss Ltd | London | 2025 |
| Abotdx Ltd | London | 2025 |
| Abotech Services Limited | Milton Keynes | 2014 |
| Abotly Ltd | London | 2025 |
| Abotra Ltd | Abingdon | 2007 |
| Abound Electronics Ltd. | Croydon | 2011 |
| About Alpha Ltd | Woodford Green | 2023 |
| About Boxing Limited | Huddersfield | 2026 |
| About Business Consultancy Limited | St. Leonards-On-Sea | 2018 |
| About Churn Limited | Surrey | 1999 |
| About Damn Time Productions Ltd | London | 2023 |
| About Damn Time Studios Ltd | Kingston Upon Thames | 2026 |
| About Digital Limited | Wingrave | 2012 |
| About Digital Media Ltd | London | 2024 |
| About Face Solutions Limited | Basingstoke | 1991 |
| About IT Limited | Bishops Stortford | 2005 |
| About My Generation Limited | Beckenham | 2006 |
| About My Wheels Limited | London | 2014 |
| About Networks Limited | Feltham | 2002 |
| About Next Limited | Welling | 2018 |
| About NOW Ltd | Greenford | 2020 |
| About Premium Content (UK) Limited | Cardiff | 2020 |
| About Publishing Limited | Harpenden | 2001 |
| About Solutions Limited | Surrey | 2002 |
| About Sound Limited | Cambridge | 2009 |
| About That Vibe Ltd | London | 2022 |
| About the Funeral Limited | Filkins | 2012 |
| About Time Enterprises Limited | Hertfordshire | 2003 |
| About Time Technologies Limited | Callington | 2023 |
| About YOU Media Ltd | Berkhamsted | 2023 |
| About Your Success Limited | Ashton-Under-Lyne | 2015 |
| About-Me Limited | Ware | 2012 |
| About:Blank Limited | Hildenborough | 2026 |
| About:Blank Studio Ltd | London | 2021 |
| Aboutface Publishing Ltd | Solihull | 2021 |
| Aboutships Limited | London | 2023 |
| Above & Below Networks Limited | Carshalton | 2023 |
| Above & Beyond Aero Ltd | London | 2025 |
| Above & Beyond Consulting Limited | Uxbridge | 2024 |
| Above ALL Consulting Limited | Eccles | 2020 |
| Above ALL Rigging Limited | Borehamwood | 2010 |
| Above and Beneath Ltd | Hitchin | 2022 |
| Above Average Media Ltd | Folkestone | 2025 |
| Above Bar Cyber Limited | Southampton | 2018 |
| Above Below Around Limited | London | 2017 |
| Above Board Distribution Limited | London | 2012 |
| Above Clouds Studio Ltd | Wembley | 2025 |
| Above Debt Limited | Motherwell | 2019 |
| Above Digital Limited | Wimborne | 2010 |
| Above IT Limited | Berkhamsted | 2017 |
| Above Mobile Limited | Manchester | 2007 |
| Above Music Group Limited | Pinner | 2019 |
| Above Productions Ltd | London | 2024 |
| Above Solutions Ltd | London | 2013 |
| Above Surveying Ltd | Colchester | 2013 |
| Above the Action Limited | South Shields | 2017 |
| Above the Cloud Limited | Chelsea | 2020 |
| Above the Cloud Services Ltd | Bolton | 2018 |
| Above the Fold Digital Marketing Ltd | Cheltenham | 2014 |
| Above the Fold Limited | Exeter | 2021 |
| Above the Line Productions Limited | Cheltenham | 2012 |
| Above UN Ltd | Birkenhead | 2022 |
| Above-It-All Limited | Horsham, | 2004 |
| Aboveandbeyondcabling Fibre Ltd | Banstead | 2026 |
| Abovo Management Ltd | Cheadle Hulme | 2006 |
| Abovo.Jobs Holdings Ltd. | East Grinstead | 2023 |
| ABP Ireg Consulting Ltd | Rickmansworth | 2020 |
| ABP Oasis Ltd | Basildon | 2023 |
| Abpcsolutions Ltd | Colchester | 2012 |
| Abpd Solutions Ltd | London | 2015 |
| Abquality Ltd | London | 2022 |
| ABR Entertainment Ltd | Bloxham | 2025 |
| ABR Exchange Limited | Motherwell | 2022 |
| ABR Health Ventures Limited | London | 2025 |
| ABR Hosting Ltd | Hatfield | 2025 |
| ABR Telecoms Ltd | Hartlepool | 2018 |
| Abra Advisors Ltd | London | 2024 |
| Abra Cloud Solutions UK Limited | London | 2025 |
| Abra Technologies Limited | Dunstable | 2023 |
| Abraca Limited | Bingham | 2001 |
| Abracadabra Studio Ltd | Blackpool | 2024 |
| Abracadabra+ Ltd | London | 2025 |
| Abracazebra Ltd | Marlow | 2023 |
| Abraham and Sons Lawyers Ltd | East Grinstead | 2026 |
| Abraham Architecture Ltd | London | 2025 |
| Abraham Consulting Ltd | Bristol | 2006 |
| Abraham Engineering and Educational Consultancy Limited | Belfast | 2014 |
| Abraham Heights Ltd | Lancaster | 2026 |
| Abrahamsen Jones Professional Services Limited | Ashford | 2014 |
| Abram Associates Limited | Epping | 2016 |
| Abram Creative Ltd | Luton | 2025 |
| Abram Hitech Limited | Derby | 2024 |
| Abramchuk & Co. Limited | London | 2021 |
| Abramelin Limited | Launceston | 1996 |
| Abramova & Ryan Limited | Brigg | 2019 |
| Abrantepa TV Ltd | London | 2020 |