| Acuity Technologies Ltd | Manchester | 2025 |
| Acuity Technology Consulting Ltd | Leighton Buzzard | 2016 |
| Acuity Technology Limited | Canvey Island | 2017 |
| Acuity Trading Ltd | London | 2013 |
| ACUITY24 Limited | Stratford-Upon-Avon | 2024 |
| Acuitycyber Limited | London | 2025 |
| Acuityloom Ltd | London | 2026 |
| Acuitypublishing Limited | Market Harborough | 2014 |
| Acuitysecurity.Io Limited | High Wycombe | 2022 |
| Aculeus Ltd | Southampton | 2009 |
| Aculinq Limited | Altrincham | 2025 |
| Aculogic Limited | Northampton | 2025 |
| Aculore Statistics Ltd | Altrincham | 2016 |
| Aculytics Ltd | St. Albans | 2022 |
| Acuma Solutions Limited | Stockport | 2000 |
| Acumant Ltd | Milton Keynes | 2022 |
| Acumatica UK Limited | London | 2021 |
| Acume International Ltd | Brighton | 2020 |
| Acumen Account Management Ltd | Kington | 2025 |
| Acumen Bay Consultancy Limited | London | 2016 |
| Acumen Business Solutions Limited | Edinburgh | 2009 |
| Acumen Business Systems Limited | Kenilworth | 2000 |
| Acumen Capital Partners Ltd. | Cardiff | 2017 |
| Acumen Cyber Ltd | Glasgow | 2023 |
| Acumen Global Academy Ltd | Romford | 2017 |
| Acumen Ideas Factory and Project Management Limited | Nottingham | 2020 |
| Acumen Infotech Ltd | Bolton | 2008 |
| Acumen Insights Ltd | Hitchin | 2003 |
| Acumen Intelligence Ltd | East Sussex | 2004 |
| Acumen International Media Limited | London | 2024 |
| Acumen IT Limited | Macclesfield | 2009 |
| Acumen Multimedia Limited | Brighton | 1999 |
| Acumen Research Limited | Hitchin | 2022 |
| Acumen Software Ltd | Blisworth | 2020 |
| Acumen Software Systems Ltd | Chichester | 2023 |
| Acumen Synergy Limited | Oldham | 2012 |
| Acumen System Solutions Ltd | Oldham | 2012 |
| Acumen Systems Limited | Leeds | 2016 |
| Acumen Technix Ltd | London | 2025 |
| Acumen Technology Limited | Malvern | 2018 |
| Acumen UK Services Ltd | Ilford | 2022 |
| Acumenia Global Ltd | Aberdeen | 2025 |
| Acumentive Limited | Richmond | 2005 |
| Acumentum Limited | Derby | 2014 |
| Acumet Limited | Bristol | 2024 |
| Acuminor UK Limited | London | 2022 |
| Acumio Ltd | London | 2023 |
| Acuna Boyz Productions Ltd | | 2007 |
| Acunity Limited | Shipley | 1990 |
| Acunova Solutions Ltd | Eastleigh | 2025 |
| Acuntec Entertainment Limited | Cardiff | 2025 |
| Acuo AI Limited | Oxford | 2025 |
| Acupower Ltd | London | 2021 |
| Acur Services Ltd | Wakefield | 2020 |
| Acura Communications Limited | Salford | 2014 |
| Acura Consultancy Limited | Edgware | 2014 |
| Acura Global Limited | London | 2022 |
| Acuras Ltd | Haddenham | 2009 |
| Acureus Ltd | London | 2018 |
| Acuris Risk Intelligence Limited | London | 2004 |
| Acurium Ltd | Sidcup | 2025 |
| Acurizon Consulting Ltd | Hitchin | 2025 |
| Acurrate Limited | London | 2025 |
| Acusensus UK Limited | London | 2022 |
| Acustaf (U.K.) Limited | | 1988 |
| Acusu Ltd | Tamworth | 2013 |
| Acutance Consulting Ltd | Darwen | 2012 |
| Acutance Insights Ltd | Aylesbury | 2023 |
| Acute Art Limited | Horsforth | 2016 |
| Acute Core Services Limited | Sheffield | 2026 |
| Acute Notions Ltd | Slough | 2022 |
| Acute Productions Ltd | Maidstone | 2023 |
| Acute Software Limited | Birmingham | 2010 |
| Acute Tech Solutions Ltd | London | 2022 |
| Acute Technologies (PVT) Limited | Hounslow | 2018 |
| Acute Technology Limited | Middx | 2005 |
| Acuteable Ltd | Seaford | 2011 |
| Acuteagility Ltd | Reading | 2023 |
| Acuteayes Solutions Limited | London | 2013 |
| Acutec (UK) Limited | Birmingham | 2010 |
| Acutec Limited | Coleshill | 1995 |
| Acutefx Design Ltd | Loughborough | 2008 |
| Acutel Limited | East Sussex | 2001 |
| Acutesound Limited | | 2004 |
| Acutism Limited | London | 2025 |
| Acuto Automation Ltd | London | 2019 |
| Acuto Consulting Ltd | Shepton Mallet | 2024 |
| Acutro Ltd | London | 2020 |
| Acutus Limited | London | 2021 |
| Acutus Productions Limited | Inverness | 2015 |
| Acuutech Limited | Loughton | 1996 |
| Acuutech Select Ltd | Loughton | 2015 |
| Acuvate Software Limited | London | 2011 |
| Acuver Consulting Ltd | London | 2022 |
| Acvera Ltd | London | 2020 |
| ACW Business Solutions Ltd | Derby | 2024 |
| ACW CAD Consultants Limited | Callington | 2010 |
| ACW Editorial Ltd | Chiddingfold | 2018 |
| ACW Software Services Limited | Watford | 2012 |
| ACW Solutions Ltd | Leeds | 2013 |