| AC Trades Ltd | Keighley | 2025 |
| AC Traffic Limited | Banbury | 2025 |
| AC Training and Consulting Ltd | Watford | 2020 |
| AC Training Ltd | Sidcup | 2018 |
| AC Translations Limited | Battle | 2015 |
| AC Transport Training Ltd | Campbell Road | 2019 |
| AC Utility Services Ltd | Loughborough | 2026 |
| AC Veterinary Services Limited | Taunton | 2022 |
| AC Walkers Ltd | Newbury | 2023 |
| AC Wind Limited | Houghton Le Spring | 2023 |
| AC Wood Consultancy UK Limited | Newtonhill | 2018 |
| AC WPC Ltd | East Kilbride | 2026 |
| Ac&C Services Limited | London | 2009 |
| Ac&Co Ltd | Derby | 2016 |
| Ac&H 159 Limited | Edinburgh | 2002 |
| Ac&H 17 Limited | Edinburgh | 1998 |
| Ac&H 19 Limited | Livingston | 1998 |
| Ac&H 212 Limited | Forfar | 2005 |
| Ac&H 22 Limited | Edinburgh | 1998 |
| Ac&H 27 Limited | East Lothian | 1998 |
| Ac&H 33 Limited | Edinburgh | 1998 |
| Ac&H 40 Limited | Rosewell | 1999 |
| Ac&Ms Limited | Canvey Island | 2003 |
| Ac&T Ltd. | Axbridge | 1992 |
| Ac-Dc Sales Services Ltd | Derby | 2024 |
| Ac-Pass Ltd | Liverpool | 2025 |
| Ac-Risc Ltd | Rugby | 2021 |
| Ac-Super Ltd | Bournemouth | 2023 |
| Ac-Sys Limited | Normanton | 2009 |
| Ac.Avaglen Ltd | Stockton On Tees | 2008 |
| Ac/Cf Design Limited | Sheffield | 1989 |
| Ac/Dc Engineering Design Ltd | Glasgow | 2016 |
| Ac/Dc Engineering Solutions Ltd | Barrow In Furness | 2026 |
| Ac/Dc Italia Platform Limited | London | 2025 |
| Ac/Dc Platform Limited | London | 2024 |
| AC06 Consulting Ltd | Hereford | 2022 |
| AC1 Consulting Ltd | Harrow | 2018 |
| AC16 Ltd | Glasgow | 2023 |
| AC1D Management Ltd | London | 2023 |
| AC2024 Limited | London | 2024 |
| AC21 Ltd | London | 2017 |
| AC2M Limited | Lytham St. Annes | 2007 |
| AC3 Marketing Ltd | Ilford | 2026 |
| AC4 Consulting Limited | Nottingham | 2025 |
| AC59 Limited | Buckhurst Hill | 1997 |
| AC6 Consultancy Ltd | East Kilbride | 2025 |
| AC67 Consultancy Ltd | Lytham St.Annes | 2022 |
| ACA a Limited | Omagh | 2012 |
| ACA Accounting Ltd | Buckley | 2024 |
| ACA Accounts Ltd | Portsmouth | 2024 |
| ACA Acoustics Limited | Swindon | 2012 |
| ACA Architecture (London) Ltd | London | 2013 |
| ACA Architecture Limited | Omagh | 2017 |
| ACA Associates Ltd | Croydon | 2024 |
| ACA Consultancy Ltd | Ashford | 2024 |
| ACA Consultants Ltd | Derby | 2019 |
| ACA Design Ltd | Southampton | 2016 |
| ACA Employee Development Limited | Newbridge | 2008 |
| ACA Engineering Consultants Ltd | Nottingham | 2025 |
| ACA Health Ltd | Basingstoke | 2026 |
| ACA Healthcare Ltd | Barnsley | 2025 |
| ACA Holdings Limited | Inchinnan | 2004 |
| ACA Law Ltd | London | 2006 |
| ACA Legal Services Ltd | London | 2023 |
| ACA Marketing Ltd | Cardiff | 2025 |
| ACA Pharma Ltd | Slough | 2025 |
| ACA Scientific & Medical Equipment Limited | Ipswich | 2021 |
| ACA Security Design Ltd | Potters Bar | 2026 |
| ACA Services Limited | Bristol | 2023 |
| ACA Shah Marketing Ltd | Luton | 2026 |
| ACA Studios Limited | | 2001 |
| ACA Surveyors Ltd | Letchworth Garden City | 2024 |
| Acac Consulting Ltd | Crawley | 2018 |
| Acacallis Limited | Batley | 2012 |
| Acacia (Investment Advisory) Limited | London | 2024 |
| Acacia Accountants Limited | London | 2010 |
| Acacia Accounting Bureau Limited | Dial Post | 2003 |
| Acacia Advisory Ltd | Chelmsford | 2025 |
| Acacia Analysis Limited | Exeter | 2024 |
| Acacia Associates Limited | Atherstone | 2014 |
| Acacia Avenue International Limited | London | 2011 |
| Acacia Business Services Limited | Essex | 2005 |
| Acacia Capital Limited | London | 2018 |
| Acacia Carpentry Limited | Mid Glamorgan | 1999 |
| Acacia Coaching Ltd | Harlow | 2023 |
| Acacia Connection Limited | London | 2018 |
| Acacia Consult Ltd | Hollinwood | 2014 |
| Acacia Development and Training Limited | Dartford | 2018 |
| Acacia Development Associates Limited | Strathpeffer | 2011 |
| Acacia Environmental Ltd | Farnham | 2020 |
| Acacia Financial Consultants Limited | Ashtead | 2017 |
| Acacia Financial Limited | Preston | 2023 |
| Acacia Gardens & Horticulture Limited | Hounslow | 2012 |
| Acacia Global Health Consulting Limited | Reading | 2023 |
| Acacia Group Holdings Ltd | Wigan | 2022 |
| Acacia Healthcare Limited | London | 2023 |
| Acacia Knowledge Limited | Poole | 2016 |
| Acacia Ltd | Dial Post | 2009 |
| Acacia Management Ltd | Newent | 2021 |
| Acacia MAY Consulting Limited | Rochford | 2019 |