| Arksoft Information Technologies Ltd | London | 2026 |
| Arksoft Limited | Loughborough | 2014 |
| Arksolid Ltd | London | 2025 |
| Arkstons Capital Limited | London | 2019 |
| Arktech Consultancy Limited | Watford | 2010 |
| Arktech IT Solutions Ltd | Farnborough | 2022 |
| Arktech Limited | Leicester | 2026 |
| Arkteck Solutions Limited | London | 2023 |
| Arktecs Solutions Ltd | Gerrards Cross | 2025 |
| Arktek Ltd | Buckinghamshire | 2006 |
| Arktiaskog Infotech Consult Limited | Kingston Upon Thames | 2025 |
| Arktic Ltd | London | 2018 |
| Arktican Ltd | Dagenham | 2022 |
| Arkticc Technologies Ltd | Harpenden | 2021 |
| Arktika (UK) Limited | Nottingham | 2005 |
| Arktoi Limited | Tenbury Wells | 2015 |
| Arktos Media Ltd | London | 2009 |
| Arktouros Ltd | Glasgow | 2015 |
| Arkuratek Ltd | Ilford | 2026 |
| Arkus Consulting Limited | London | 2018 |
| Arkus IT Ltd | Currie | 2022 |
| Arkver Ltd | Ballynahinch | 2012 |
| Arkvien AI Ltd. | London | 2021 |
| Arkvision Solutions Ltd | Ruislip, | 2025 |
| Arkwest Limited | Ruislip | 2007 |
| Arkwright Technologies Limited | Exeter | 2025 |
| Arkwych Ltd | London | 2026 |
| Arky Limited | Rickmansworth | 2016 |
| ARL Network Solutions Ltd | Warrington | 2021 |
| ARL Sound Ltd | East Riding Of Yorkshire | 2016 |
| ARL Technology Ltd | Falkirk | 2019 |
| ARL Technology PVT Ltd | London | 2020 |
| Arla Ltd | Luton | 2026 |
| Arla Systems Ltd | Braunton | 2016 |
| Arla Training Services Ltd | Cambridge | 2013 |
| Arlano Ltd | Birmingham | 2025 |
| Arlano-Filmservice Ltd | London | 2022 |
| Arlation UK Limited | London | 2022 |
| Arlato Ltd | London | 2023 |
| Arlea Studios Ltd | Brighton | 2020 |
| Arlebo Ltd | London | 2026 |
| Arleco Holdings Ltd | Weymouth | 2023 |
| Arleem Ltd | London | 2026 |
| Arlemi Limited | Gloucester | 2017 |
| Arlen Cyber Protection Limited | Stockport | 2024 |
| Arlene Stuart Limited | Pathhead | 2022 |
| Arlex AI Ltd | London | 2026 |
| Arlex Technology Limited | Oxford | 2025 |
| Arlienly Limited | London | 2023 |
| Arlinda Ltd | Westerham | 2017 |
| Arling Films Ltd | London | 2025 |
| Arlington Coney Ltd | Stratford Upon Avon | 2018 |
| Arlington IT Limited | Macclesfield | 2022 |
| Arlington Square Aesthetics Ltd | London | 2021 |
| Arlington Wolcott Consultants Ltd | London | 2018 |
| Arlington* Records Ltd. | Newcastle Upon Tyne | 2024 |
| Arlio Ltd | London | 2025 |
| Arllecta Ltd | London | 2022 |
| Arlo AI Ltd | Manchester | 2026 |
| Arlo Edinburgh Limited | Edinburgh | 2022 |
| Arlo Films Ltd | London | 2026 |
| Arlo Heights Limited | London | 2025 |
| Arlo IT Limited | Woodbridge | 2021 |
| Arlo Software (UK) Limited | London | 2019 |
| Arlo Solutions Limited | London | 2022 |
| Arlo Technologies UK Limited | Staines-Upon-Thames | 2018 |
| Arlo.Fi Ltd | Southall | 2025 |
| Arloe AI Limited | London | 2025 |
| Arlofin Limited | London | 2025 |
| Arloir Limited | Leicester | 2024 |
| Arlon Songs Limited | Holborn | 2006 |
| Arlosh Manuals Limited | Lytham St. Annes | 2021 |
| Arlosoft Ltd | Gillingham | 2011 |
| Arlotech Services Limited | London | 2023 |
| Arlowe Ltd | Splott | 2025 |
| Arltsols Ltd | Edinburgh | 2016 |
| Arluma Ltd | Edinburgh | 2025 |
| Arluna Limited | Manchester | 1997 |
| Arlynrca Limited | Nr Wigan | 2010 |
| ARM Analytics Limited | Tonbridge, Kent | 2022 |
| ARM Code Ltd | Sutton | 2025 |
| ARM Consultancy Services Limited | Harrow | 2015 |
| ARM Consulting (South West) Ltd | Axminster | 2020 |
| ARM Consulting PVT Limited | Bath | 2023 |
| ARM Consulting Services Limited | Wimborne | 2007 |
| ARM Data Analytics Limited | Ewloe | 2025 |
| ARM Digital, Cloud & IT Advisory Ltd | Huddersfield | 2017 |
| ARM Guard Ltd | Warrington | 2019 |
| ARM IP Limited | Cambridge | 2013 |
| ARM Logics Ltd. | Maidenhead | 2014 |
| ARM Networks Limited | Bedford | 2016 |
| ARM Shield Media Solution Limited | London | 2026 |
| ARM Solutions PVT Limited | Harrow | 2005 |
| ARM Synergy Ltd | London | 2025 |
| ARM Tech Engineering Limited | London | 2025 |
| ARM Thomas Limited | Hainault Business Park | 2020 |
| Arm-X Solutions Limited | London | 2023 |
| ARM42 Limited | London | 2016 |
| ARM4G3DON Productions Ltd | Woking | 2026 |
| ARM999 Ltd | London | 2019 |