| Ace Vehicle Hire Limited | Oldham | 2021 |
| Ace Virtual Office Ltd | Portsmouth | 2026 |
| Ace'D IT Salon Ltd | Cardiff | 2019 |
| Ace's-Connect Limited | Eltham | 2020 |
| Ace+ Holdings Limited | Manchester | 2016 |
| Ace-Uk Services Ltd | Loughborough | 2023 |
| Ace. at. Consultancy Limited | Motherwell | 2020 |
| Aceandfade Ltd | Manchester | 2025 |
| Acebay Services Limited | London | 2012 |
| Acebright Ltd | Dorking | 2021 |
| Acebruk Associacao Comercial E Empresarial Para Brasileiros NO Reino Unido Limited | Southampton | 2025 |
| Acefadez Ltd | London | 2025 |
| Acefast Computers Ltd | Ipswich | 2020 |
| Aceie Ltd | Lanark | 2019 |
| Acelancing Ltd | London | 2023 |
| Acenaha Ltd | Manchester | 2023 |
| Acension Cogf CIC | Croydon | 2025 |
| Acer Beauty Ltd | Leamington Spa | 2024 |
| Acer Fitness Ltd | London | 2023 |
| Acer Gundog Training Limited | Royston | 2017 |
| Acer Psychological & Therapy Services Ltd | Studley | 2023 |
| Acer Snowmec Technologies Limited | Brierley Hill | 2014 |
| Aces Barber Hampton Ltd | East Molesey | 2017 |
| Aces Car Hire Limited | Manchester | 2015 |
| Aces Cleaning Ltd | Coventry | 2017 |
| ACES4 Ltd | Cranbrook | 2018 |
| Aceso Lifestyle Medicine Limited | Westhill | 2018 |
| Aceso Universal Limited | Hounslow | 2015 |
| Acestakes Investment Limited | Glasgow | 2025 |
| Acethetic Clinics Ltd | Eastleigh | 2026 |
| Acethetic Ltd | Fareham | 2019 |
| Acevale Limited | Hertfordshire | 2013 |
| Acevan Events Ltd | Liverpool | 2025 |
| Acewise Limited | Watford | 2015 |
| ACF Cleaning Limited | Stirling | 2002 |
| ACF Conferences and Seminars Ltd | London | 2000 |
| ACF Furniture Ltd | Kilmarnock | 2021 |
| ACF Home Cover Limited | Corby | 2025 |
| ACF Homecare Limited | Corby | 2024 |
| ACF London Limited | Mayfair | 2014 |
| Acfin Ltd | Birmingham | 2014 |
| Acfinar Ltd | London | 2015 |
| ACG Advisors Nominees Ltd | London | 2018 |
| ACG Beauty Ltd | London | 2025 |
| ACG Concierge Ltd | London | 2021 |
| ACG Global (Europe) Limited | Esher | 2011 |
| ACG Legal Marketing Ltd | Loughborough | 2025 |
| ACG Limited | Farnborough | 1982 |
| ACG Marketing Team Ltd | Liverpool | 2024 |
| ACG Rehab Ltd | Bolton | 2024 |
| ACG Services Ltd | London | 2019 |
| Acgc Forum Limited | London | 2022 |
| ACH Frith Trading Limited | Doncaster | 2019 |
| ACH Hire Limited | Chelmsford | 2024 |
| ACH Trading Ltd | Cardiff | 2024 |
| Acha Services Ltd | London | 2025 |
| Acharra Properties Ltd | Edinburgh | 2019 |
| Acharya Ayurveda Limited | Market Harborough | 2023 |
| Acharya Limited | Morden, Surrey | 2017 |
| Achi Afro Fitness CIC | Oxford | 2025 |
| Achieve 2 Excel Limited | Birmingham | 2018 |
| Achieve Dreams Limited | Harrow | 2025 |
| Achieve Management Limited | Stevenage | 2012 |
| Achieve Performance Ltd | Northwich | 2024 |
| Achieve Therapeutic Fostering Ltd | Sandwich | 2020 |
| Achieve Therapy Ltd | Reading | 2015 |
| Achieve With Autism Consultancy Ltd | London | 2016 |
| Achieve With US (Hinckley) C.I.C. | Birkenhead | 2013 |
| Achieve With US Ltd. | Birkenhead | 2012 |
| Achievements of Canterbury Limited | Canterbury | 2015 |
| Achievers in Life Ltd | Exeter | 2014 |
| Achill Spa Ltd | Solihull | 2022 |
| Achille Group Limited | Birmingham | 2006 |
| Achille Ratti Climbing Club Limited | Holmfirth | 2023 |
| Achilleon Consultancy Limited | Newport Pagnell | 2013 |
| Achilles Heels Shoe Care Limited | London | 2011 |
| Achillesway Ltd | London | 2024 |
| Achim Limited | London | 2005 |
| Achim UK Trading Limited | London | 2026 |
| Achisomoch AID Company Limited | London | 1979 |
| Achnacarry Stalking Limited | Forfar | 2018 |
| Achnacarry Wildlife Management Limited | Forfar | 2020 |
| Achnas Ltd | Telford | 2023 |
| Acholi Bereavement Fund | London | 2025 |
| Achray Projects Ltd | Northwich | 2007 |
| Achron Engineering Solutions Limited | Dundee | 2016 |
| Achterhoek Fourage IBC Limited | Hythe | 2025 |
| Achut Ltd | Tipton | 2015 |
| Achyuta Technology Ltd | Watford | 2023 |
| ACI Group Private Limited | London | 2025 |
| ACI UK Financial Markets Association | London | 2024 |
| Aciers UK Limited | Hounslow | 2008 |
| Acies Counselling Services Ltd | Newmarket | 2020 |
| Acimovdragan Ltd | Sheffield | 2023 |
| Acit Support Limited | Worcester Park | 2014 |
| ACJ Consultants Limited | Hailsham | 2017 |
| ACJ Salons Limited | Eastleigh | 2019 |
| ACK Limited | Leicester | 2015 |
| ACK Services Ltd | Bristol | 2025 |
| Ackles Ltd | Loughton | 2026 |