| ATG Connections Ltd | Ballymena | 2026 |
| ATG Holdings Limited | London | 2008 |
| ATG Mexico Holdings Limited | London | 2008 |
| ATG Solutions Limited | London | 2026 |
| Atgc Services Limited | London | 2025 |
| Atge Plus Ltd | Dumbarton | 2015 |
| Atgof CYF. | Cardiff | 2022 |
| Atgor Investment Ltd | London | 2014 |
| ATH Ltd | Brighton | 2009 |
| ATH Network Solution Ltd | Ilford | 2019 |
| ATH Project Solutions Ltd | Peterborough | 2021 |
| ATH Scenery Limited | Acton | 2014 |
| ATH Scotland Limited | Kilmacolm | 2025 |
| ATH Software Services Ltd | Oxford | 2019 |
| Athair & Sons Limited | London | 2018 |
| Athame Games Ltd | Guildford | 2026 |
| Athanatech Limited | Edgware | 2023 |
| Athanatic Ltd | Newmarket | 2022 |
| Athanatos Press Limited | London | 2025 |
| Athanis Creative Ltd | Wilmslow | 2024 |
| Athanor Media Labs Ltd | Edinburgh | 2025 |
| Athar Consulting Limited | Luton | 2025 |
| Athar Originals Ltd | London | 2026 |
| Athar Tech Ltd | Elland | 2023 |
| Athari Intelligence Ltd | London | 2025 |
| Atharv Analytics Ltd | Colchester | 2022 |
| Atharv International Ltd | Harrow | 2023 |
| Atharv Solutions Limited | Glasgow | 2022 |
| Atharva Infotech Limited | Edinburgh | 2011 |
| Atharva Software Solutions Limited | Altrincham | 2019 |
| Atharvaretail Technology Ltd | Kent | 2024 |
| Athayr Films Ltd. | Glasgow | 2016 |
| Atheda Limited | Penzance | 2007 |
| Athel Ltd | London | 2026 |
| Athelas Data Ltd | London | 2024 |
| Athelas Testing Limited | Thame | 1997 |
| Athelstan Services Ltd | Chippenham | 2023 |
| Athelstan Solutions Ltd | Peterborough | 2021 |
| Athelstanone PTY Ltd | Sheffield | 2022 |
| Athelstone Consultants Limited | Amersham | 2011 |
| Athelyft Ltd | London | 2026 |
| Athena Advisors Limited | London | 2017 |
| Athena Advisory Solutions Ltd | Leicester | 2022 |
| Athena AI Ltd | Cardigan | 2026 |
| Athena AI Technologies Limited | Kingston Upon Thames | 2023 |
| Athena Analysts Limited | Harrow | 2020 |
| Athena Apps Limited | Walsall | 2024 |
| Athena BDA Ltd | St. Albans | 2024 |
| Athena Byte Ltd | London | 2025 |
| Athena Consultancy Ltd | London | 2021 |
| Athena Consulting Partners & Ventures Limited | Maidenhead | 2022 |
| Athena Content Limited | Harrow | 2017 |
| Athena Counselling Services Ltd | Swansea | 2016 |
| Athena Creative Media Ltd | Huddersfield | 2022 |
| Athena CRM Ltd | Hornchurch | 2024 |
| Athena Cyber Security Limited | Manchester Road | 2018 |
| Athena Data Centres Ltd | Bolton | 2017 |
| Athena Decision Systems Ltd | London | 2024 |
| Athena Dental Laboratory Limited | Northampton | 2012 |
| Athena Discovery Labs Limited | Isleworth | 2024 |
| Athena Edge Ltd | London | 2025 |
| Athena Energy Limited | Warrington | 2018 |
| Athena F. Ltd | London | 2019 |
| Athena Films Limited | Chandler'S Ford | 2005 |
| Athena Global Ltd | Chesterfield | 2024 |
| Athena Horizons Limited | Folkestone | 2009 |
| Athena Infotech Limited | Staines-Upon-Thames | 2008 |
| Athena Innovation Ltd | Laurencekirk | 2019 |
| Athena IT Consulting Ltd | Cambridge | 2024 |
| Athena IT Solutions Ltd | Bury St. Edmunds | 2024 |
| Athena Language Services Ltd | Kingston Upon Hull | 2024 |
| Athena Legal Consultancy Limited | London | 2013 |
| Athena Network Technologies Ltd | London | 2023 |
| Athena Nexus Limited | London | 2024 |
| Athena NKP Ltd | Ilford | 2018 |
| Athena Noble Ltd | London | 2025 |
| Athena Productions Ltd | Towcester | 2021 |
| Athena Project Management Limited | Stowmarket | 2022 |
| Athena Promotions Ltd | Eastbourne | 2025 |
| Athena PVT Limited | London | 2019 |
| Athena Service Group Limited | Norwich | 2021 |
| Athena Services Limited | Rochester | 2022 |
| Athena Solutions Limited | Andover | 2000 |
| Athena Supply Chain Solutions Limited | Chorley | 2024 |
| Athena Systems Design Limited | Little Chalfont | 1986 |
| Athena TCS Ltd | Caldicot | 2016 |
| Athena Tech Innovations Ltd | London | 2020 |
| Athena Trade Limited | Kingston Upon Thames | 2023 |
| Athena Ventures Ltd | London | 2018 |
| Athena Vortex Ltd | London | 2025 |
| Athena Works Limited | London | 2024 |
| Athena Worlds Limited | Cardigan | 2024 |
| Athena Worldwide Solutions Ltd | Tring | 2022 |
| Athena's Trades Limited | Edinburgh | 2025 |
| Athenaaad Limited | London | 2024 |
| Athenaai by AOR Ltd | Norwich | 2025 |
| Athenaeum Limited | Ripley | 1999 |
| Athenaeum Project Ltd | London | 2026 |
| Athenafi (Amorphic Alpha) Ltd | London | 2024 |
| Athenai Ltd | Poole | 2023 |