| Antani Ltd | London | 2018 |
| Antanova Ltd | Watford | 2005 |
| Antar Information Technology Limited | Greater Manchester | 1984 |
| Antara Innovations Ltd | London | 2025 |
| Antarctic Connections Ltd | Romford | 2012 |
| Antarctic Group Limited | Wimborne | 2024 |
| Antarctic Systems Limited | Waterlooville | 2024 |
| Antarctica Media Limited | Romford | 2020 |
| Antarctica Software Ltd | London | 2024 |
| Antardrishti Analytics Ltd | Worthing | 2023 |
| Antare Group Limited | London | 2024 |
| Antare Technology Limited | London | 2024 |
| Antares 2012 Ltd | High Wycombe | 2012 |
| Antares Brilliance Limited | Ashford | 2023 |
| Antares Corporation Ltd | London | 2022 |
| Antares Cyber Security Ltd | Eastbourne | 2023 |
| Antares Digital Ltd | London | 2017 |
| Antares Digital Marketing Ltd | London | 2024 |
| Antares Film Ltd | London | 2022 |
| Antares Healthcare Limited | London | 2023 |
| Antares Interactive Digital Ltd | London | 2014 |
| Antares Marketing Ltd | London | 2025 |
| Antares Tech Ltd | Chigwell | 2013 |
| Antarina Limited | Wiltshire | 2003 |
| Antaris Technology Limited | Surrey | 1997 |
| Antarus Limited | London | 2018 |
| Antaryx Ltd | Wellingborough | 2024 |
| Antavo Limited | London | 2012 |
| Antbec Services Limited | Bristol | 2014 |
| Antdata Group Limited | Craigavon | 2018 |
| Antdora Ltd | London | 2023 |
| Ante Productions Limited | London | 2020 |
| Anteam Ltd | Nottingham | 2020 |
| Anteater Consulting Limited | Blackpool | 2001 |
| Anteater Projects Ltd | Fareham | 2016 |
| Antec Global Ltd | London | 2024 |
| Antec Mobile Limited | Durham | 2015 |
| Antecedent Film Ltd | London | 2026 |
| Antech Solutions (NW) Ltd | Nelson | 2025 |
| Antech Solutions Ltd | Ickenham | 2018 |
| Antechamber Music Limited | Chester | 2021 |
| Antecora Limited | London | 2015 |
| Anteeo Solutions Limited | London | 2000 |
| Anteiku AI Ltd | Slough | 2026 |
| Antek Solutions Limited | Windsor | 2007 |
| Anteli Ltd | London | 2017 |
| Antell Media Limited | London | 2026 |
| Antelope Consulting Ltd | Sandown | 2004 |
| Antelope Engineering Ltd | Blackpool | 2019 |
| Antelope Entertainment Limited | Windsor | 2000 |
| Antelope Films Ltd | London | 2021 |
| Antelope Grasslands Ltd | Bury St Edmunds | 2017 |
| Antelope I.T. Ltd | Staffordshire | 1996 |
| Antelope Technologies Ltd | Sandown | 2021 |
| Antem Services Limited | Bicester | 2003 |
| Antena Cyfyngedig | Llandudno | 1998 |
| Antenai Ltd | Twickenham | 2025 |
| Antene Satelit Londra Ltd | Bushey | 2023 |
| Antenna Boutique Ltd | Halstead | 2019 |
| Antenna Industries Limited | Southend-On-Sea | 2008 |
| Antenna Interactive Limited | Barnet | 2009 |
| Antenna Ltd | Palmers Green | 2008 |
| Antenna Pacific Broadcasts Limited | London | 2004 |
| Antenna Pictures Limited | London | 2019 |
| Antenna Rigging Services Limited | Doncaster | 2011 |
| Antenna Services (NW) Limited | Warrington | 2004 |
| Antenna Sustainability Group Ltd | London | 2024 |
| Antennaco Limited | London | 2025 |
| Antenore Limited | London | 2025 |
| Antenova Limited | Guildford | 1999 |
| Anteridia Limited | Chelmsford | 1998 |
| Anterion Ltd | Lymington | 2024 |
| Anterior Ltd | London | 2023 |
| Anteros Europe Limited | London | 2011 |
| Anterosia Ltd | London | 2022 |
| Anterospective Limited | Sevenoaks | 2024 |
| Anterpeak Ltd | Melbourn | 2019 |
| Anterra AI Limited | London | 2024 |
| Antesolis Consulting Services Limited | Cockermouth | 2002 |
| Antestic Ltd | London | 2026 |
| Anteus Solutions Limited | Wallington | 2021 |
| Antevenia Limited | Bloxham | 2013 |
| Antevia Angels Limited | Lincoln | 2021 |
| Antevia Ltd | Reading | 2021 |
| Antex Technology Limited | Berkshire | 1998 |
| Anteyco Technology Ltd | London | 2022 |
| Anteza Ltd | Pinner | 2016 |
| Antfarm Film Services Ltd. | Manchester | 2023 |
| Anthaio Limited | Rainham | 2018 |
| Anthalamic Ltd | London | 2026 |
| Antheia Consultancy Limited | Reading | 2014 |
| Anthelium Ltd | London | 2026 |
| Anthem Creative Arts Limited | London | 2017 |
| Anthem Engagement Ltd | Accrington | 2002 |
| Anthem Media Limited | Manchester | 2012 |
| Anthem Productions Limited | Bromsgrove | 2023 |
| Anthem Publishing Limited | Bath | 2002 |
| Anthemion Live Ltd | Nottingham | 2025 |
| Anthemion Software Limited | Melton Mowbray | 2003 |
| Anther AI Limited | London | 2026 |