| ACM Hygienist Limited | Bishop'S Stortford | 2025 |
| ACM Imaging Ltd | Liverpool | 2022 |
| ACM Speech and Language Therapy Limited | London | 2021 |
| Acme Anaesthetics Limited | Cambridge | 2025 |
| Acme Care Limited | Lutterworth | 2001 |
| Acme Dental Laboratories Limited | Stoke-On-Trent | 2001 |
| Acme Equipment Hire Ltd | Amersham | 2020 |
| Acme Health Limited | Sudbrooke | 2016 |
| Acmed Services Ltd | Barking | 2014 |
| ACMH1 Services Ltd | London | 2023 |
| Acmt Surgery Limited | Leeds | 2011 |
| ACN Health Limited | Harlow | 2025 |
| Acne Antidote Limited | Cheltenham | 2023 |
| Acnestis Limited | Slough | 2018 |
| Acnj Ltd | Sutton | 2022 |
| ACO Clinic Limited | Thornton-Cleveleys | 2025 |
| ACO Medical Ltd | St. Helens | 2025 |
| Acoa Healthcare Limited | Kilmarnock | 2020 |
| Acob Company Limited | London | 2025 |
| Acoco Service Enterprise Limited | Rainham | 2023 |
| Acode Healthcare Ltd | Leicester | 2024 |
| Acodixit Ltd | Morden | 2016 |
| Acola Kids Ltd | London | 2018 |
| Acolash Ltd | London | 2021 |
| Acom Physiotherapy Limited | London | 2017 |
| Acom Unity CIC | Birmingham | 2022 |
| Acomb Carers Ltd | York | 2022 |
| Acomb Chiropractic Clinic Limited | York | 2010 |
| Acomb Medical Limited | York | 2012 |
| Acootec Limited | Radstock | 2022 |
| Acor Limited | Southampton | 2023 |
| Acorn (Watford) Ltd | Watford | 2006 |
| Acorn 2 Oak Care Limited | Norwich | 2022 |
| Acorn 2 Oak Support Services Ltd | Braintree | 2022 |
| Acorn Academy Day Nursery Ltd | Peterborough | 2017 |
| Acorn Autism Specialists Limited | Colchester | 2021 |
| Acorn Birth Services Limited | Sutton Coldfield | 2013 |
| Acorn Care & Nursing Limited | Gosforth | 2006 |
| Acorn Care (NE) Ltd | Darlington | 2010 |
| Acorn Care (UK) Limited | Darlington | 2008 |
| Acorn Care Group Limited | Bexleyheath | 2023 |
| Acorn Care Providers Limited | Billingham | 2012 |
| Acorn Care Service Ltd | Sandown | 2003 |
| Acorn Care Services Limited | Worthing | 1997 |
| Acorn Care Solutions Ltd | Gosport | 2022 |
| Acorn Chase Care Ltd | Frinton-On-Sea | 2025 |
| Acorn Childcare (Spalding) Limited | Spalding | 2008 |
| Acorn Children & Families Well-Being Limited | Marske By The Sea | 2019 |
| Acorn Children Care Ltd | Liverpool | 2026 |
| Acorn Children's Home (Branston) Ltd | Northampton | 2016 |
| Acorn Children's Home (Burton) Ltd | Burton-On-Trent | 2013 |
| Acorn Children's Homes Ltd | London | 2025 |
| Acorn Childrens Services Limited | Colne | 2023 |
| Acorn Chiropody & Podiatry Limited | East Sussex | 2008 |
| Acorn Chiropractic (Penarth) Limited | Penarth | 2023 |
| Acorn Chiropractic Limited | Bristol | 2013 |
| Acorn Clinic Ltd. | Dartford | 2010 |
| Acorn Clinical Psychology Ltd | London | 2016 |
| Acorn Clinical Solutions Ltd | Rochester | 2022 |
| Acorn Complete Care Ltd | London | 2021 |
| Acorn Continuing Healthcare Ltd | London | 2025 |
| Acorn Day Care Limited | Luton | 2022 |
| Acorn Day Nursery (ST Andrews) Limited | St Andrews | 2017 |
| Acorn Day Opportunities Ltd | London | 2013 |
| Acorn Dental (York) Limited | Otley | 2015 |
| Acorn Diagnostics Ltd | Penarth | 2021 |
| Acorn Foot Practice Ltd | Glasgow | 2017 |
| Acorn Fostering Services Limited | Leicester | 2003 |
| Acorn Health Care Limited | West Wickham | 1993 |
| Acorn Health Limited | Newbury | 2025 |
| Acorn Healthcare Services Ltd | Penarth | 2021 |
| Acorn Home Support Ltd | Didcot | 2021 |
| Acorn Homes (UK) Limited | Ramsgate | 1997 |
| Acorn House (Fostering Services) Limited | Oldham | 2007 |
| Acorn House Residential Home Limited | Harlow | 2005 |
| Acorn Houses Respite Ltd | Huddersfield | 2023 |
| Acorn Housing Solutions Limited | Derby | 2020 |
| Acorn Imaging Ltd | London | 2020 |
| Acorn Implant & Dental Practice Ltd | Oldham | 2010 |
| Acorn Independent Care Services Ltd | Ilford | 2023 |
| Acorn Interpreting Ltd | Newcastle | 2018 |
| Acorn Laboratory Limited | Colchester | 2003 |
| Acorn Leaf Care Ltd | Coventry | 2022 |
| Acorn Legal Marketing Services Ltd | Heskin | 2011 |
| Acorn Life Coaching & Hypnotherapy Ltd | Hertfordshire | 2024 |
| Acorn Lodge (Bournemouth) Limited | Airport Christchurch | 2002 |
| Acorn Lodge Limited | London | 2001 |
| Acorn Lodge Sovereign Care Limited | Burgess Hill | 2017 |
| Acorn Luxury Care Limited | Dorset | 1999 |
| Acorn MED Limited | Manchester | 2017 |
| Acorn Nursery Limited | Swansea | 2020 |
| Acorn Occupational Health Limited | London | 2005 |
| Acorn Play Therapy Limited | Egham | 2015 |
| Acorn Pregnancy Counselling Centre Limited | Worthing | 2002 |
| Acorn Psychiatry and Wellbeing Limited | Norwich | 2026 |
| Acorn Psychiatry Ltd | Weybridge | 2022 |
| Acorn Psychological Services Ltd | St Albans | 2025 |
| Acorn Recovery Projects | Burnley | 1997 |
| Acorn Residential Care Ltd | Wolverhampton | 2014 |
| Acorn Scotland Ltd | Paisley | 2025 |