| Acts Group Limited | Leeds | 2004 |
| Acts Partnership Limited | | 1994 |
| Acts Traders Ltd | Birmingham | 2018 |
| Actu@Te Ltd | Wimborne | 2015 |
| Actua Business Services Limited | Bury | 2001 |
| Actua Solutions Ltd | Liverpool | 2011 |
| Actual Communications Limited | Cirencester | 2015 |
| Actual Consultancy Ltd | Wokingham | 2014 |
| Actual Factual Limited | Coventry | 2020 |
| Actual Intelligence (Emea) Ltd | London | 2016 |
| Actual Intelligence Ltd | London | 2005 |
| Actual Perceptions Ltd | Benfleet | 2021 |
| Actual Recruitment Services Limited | Ashford | 1998 |
| Actual Vibes Ltd | London | 2025 |
| Actualise Business Psychology Limited | Wilmslow | 2003 |
| Actualise Coaching and Training Ltd | Wirral | 2018 |
| Actualise Consultancy Limited | Edinburgh | 2017 |
| Actualise Consultancy Services Ltd | Bedford | 2015 |
| Actualise Law Ltd | Reading | 2020 |
| Actualise Learning Ltd | Stourbridge | 2011 |
| Actualise Ltd | Ilkeston | 2006 |
| Actualise Research Services Ltd. | Twickenham | 2016 |
| Actualise the Potential Ltd | Keighley | 2023 |
| Actualised Consulting Limited | Chelmsford, Essex | 2023 |
| Actualised Ltd | Luton | 2021 |
| Actualitas Limited | Warrington | 2019 |
| Actuality Plus Limited | Northampton | 2001 |
| Actually Changing the World Ltd | Tonbridge | 2021 |
| Actually Creative Limited | London | 2022 |
| Actually in the Arena Limited | Devizes | 2020 |
| Actualultra Limited | Broxburn | 2001 |
| Actuari Ltd | Sevenoaks | 2019 |
| Actuaria Consulting Ltd | Purley | 2017 |
| Actuaria Initia Limited | London | 2018 |
| Actuaria Ltd | Leighton Buzzard | 2022 |
| Actuarial Accountancy Limited | London | 2018 |
| Actuarial Advisory Group Ltd | London | 2016 |
| Actuarial Advisory Solutions Ltd | London | 2025 |
| Actuarial Consulting Enterprises Limited | London | 2011 |
| Actuarial Creatives Ltd | Shrewsbury | 2023 |
| Actuarial Enterprise Solutions Limited | Bolton | 2014 |
| Actuarial JVR Ltd | Leicester | 2025 |
| Actuarial Project Services Limited | Peterborough | 2010 |
| Actuarial Regulatory and Tax Advisors Limited | London | 2013 |
| Actuarius Risk & Value Management Limited | Hertfordshire | 2008 |
| Actuate (Management Services) Limited | Vale Of Glamorgan | 2006 |
| Actuate Advisory Limited | London | 2023 |
| Actuate Coaching Limited | Lewes | 2022 |
| Actuate London Ltd | Biggin Hill | 2023 |
| Actuate Management Development Limited | London | 1990 |
| Actuate Partnership Limited | London | 2005 |
| Actuate Technology Ltd | Hove | 2013 |
| Actuatech Management Limited | London | 2017 |
| Actuateyou Ltd | Wakefield | 2025 |
| Actuatii Limited | Shrewsbury | 2012 |
| Actuation Consulting Limited | Bournemouth | 2016 |
| Actuation LAB Ltd | Bristol | 2018 |
| Actuation Technology Limited | Chippenham | 2013 |
| Actuators Consulting Limited | London | 2025 |
| Actum International UK Limited | London | 2015 |
| Actum Ventures Limited | Northwood | 2006 |
| Actura Advisory Limited | Exeter | 2026 |
| Actura Ltd | St. Albans | 2022 |
| Acturis Group Limited | London | 2010 |
| Acturis International Limited | London | 2010 |
| Actus Consultancy Limited | Radstock | 2021 |
| Actus Consulting Ltd | London | 2013 |
| Actus Consulting Services Ltd | London | 2026 |
| Actus ESG Limited | Bexleyheath | 2022 |
| Actus FCR Solutions Limited | Bexleyheath | 2018 |
| Actus Finance Ltd | Abingdon | 2026 |
| Actus Ltd | London | 2024 |
| Actus Partners Ltd | London | 2019 |
| Actus RE Ltd | Kington | 2024 |
| Actus Software Ltd | St. Albans | 2016 |
| Actus Verto Limited | Widnes | 2020 |
| Actuserve Limited | New Romney | 2013 |
| Actuwize Ltd | Wilmslow | 2008 |
| Actve Limited | Altrincham | 2024 |
| Actxion Ltd | London | 2025 |
| ACU Consultancy Ltd | Chester | 2022 |
| ACU Management Limited | London | 2016 |
| ACU Solutions Ltd | London | 2026 |
| Acu-Fertility Alliance Ltd | London | 2021 |
| Acuaccounts Limited | London | 2014 |
| Acuario Ltd | Wiltshire | 2006 |
| Acubed Global Services Ltd | London | 2020 |
| Acubooks Ltd | Kidderminster | 2024 |
| Acuconsult Limited | Ruislip | 1993 |
| Acuerdo Ltd | Huntingdon | 2019 |
| Acueva Accountancy and Tax Services Ltd. | Reading | 2024 |
| Acufense Ltd | Royston | 2026 |
| Acufin Limited | Rogate | 2002 |
| Acufinance Limited | London | 2017 |
| Acufireuk Ltd | Southampton | 2013 |
| Acugio Ltd | London | 2025 |
| Acugrip Ltd | Redbourn | 2023 |
| Acuigen Ltd | University Way Cranfield | 1993 |
| Acuit Ltd | Maidstone | 2019 |
| Acuitas Communications Ltd | Wimborne | 2015 |