| Acon Security Services Ltd | Dagenham | 2024 |
| Aconique Ltd | Manchester | 2021 |
| Aconley Investments and Enterprises Ltd | Peterborough | 2012 |
| Acool Limited | Surrey | 2004 |
| Acorah Productions Limited | High Peak | 2007 |
| Acord Cars Ltd | Bishop'S Stortford | 2017 |
| Acoria Limited | Bournemouth | 2017 |
| Acorn & GH (RF) Limited | Loughton | 2017 |
| Acorn (Harrow) Limited | Harrow | 2025 |
| Acorn (Yorkshire) Limited | Mexborough | 2008 |
| Acorn 2 Oak (2017) Ltd | Spalding | 2017 |
| Acorn 3000 Limited | Llanelli | 2014 |
| Acorn 31 Ltd | Wilmslow | 2024 |
| Acorn Administration and Support Services Ltd | Chislehurst | 2023 |
| Acorn Advisers Limited | London | 2016 |
| Acorn Air Conditioning & Refrigeration Limited | Bury St Edmunds | 2009 |
| Acorn Analytical Services Ltd | Cleckheaton | 2003 |
| Acorn Aspirations Limited | Leicester | 2014 |
| Acorn Associates Limited | Oldham | 2025 |
| Acorn AV Ltd. | Chessington | 2015 |
| Acorn Black Investments Holdings Limited | Gloucester | 2023 |
| Acorn BS Services Ltd | Leeds | 2018 |
| Acorn Building Ltd | London | 2009 |
| Acorn Business Consultancy Ltd | Northwood | 2019 |
| Acorn Business Holdings Ltd | Northampton | 2022 |
| Acorn Business Park (Cosham) Management Company Limited | Portsmouth | 1993 |
| Acorn Business Solutions Limited | Sheffield | 2016 |
| Acorn Capital Dynamics Ltd | London | 2025 |
| Acorn Capital Support Services Ltd | Wilmslow | 2025 |
| Acorn Care Property Ltd | Leicester | 2015 |
| Acorn Carpet Cleaning Limited | Paisley | 2021 |
| Acorn Carpets & Flooring Ltd | London | 2014 |
| Acorn Chimney Sweeps Ltd | Burnley | 2003 |
| Acorn Chorley Limited | Sheffield | 2013 |
| Acorn Cleaning Limited | Brackley | 2007 |
| Acorn Cleaning Manchester Limited | Manchester | 2020 |
| Acorn Cleaning Services Limited | Norwich | 2000 |
| Acorn Commercial Investments Limited | London | 2020 |
| Acorn Commercial Valeting Limited | Aylesbury | 2004 |
| Acorn Connect Ltd | Nottingham | 2020 |
| Acorn Construction Ltd | Preston | 2019 |
| Acorn Containers Limited | London | 2024 |
| Acorn Contract Cleaning Limited | Horley | 2010 |
| Acorn Contracts Limited | Preston | 2018 |
| Acorn Custom Tours & Travel Limited | Coleford | 2003 |
| Acorn Development Services Limited | Tullibody | 2006 |
| Acorn Direct Limited | St. Albans | 2022 |
| Acorn Driveways & Fencing Ltd | Chesterfield | 2016 |
| Acorn Driveways Limited | Lancashire | 2003 |
| Acorn Electrical Contractors Limited | Market Drayton | 2007 |
| Acorn Environment Services Limited | Manchester | 1990 |
| Acorn Environmental Care Limited | Brierley Hill | 2012 |
| Acorn Environmental Pest Control Limited | Fence Houses, Houghton Le Spring | 2008 |
| Acorn Environmental UK Limited | Wallington | 1984 |
| Acorn Facilities Management Ltd | Swindon | 2007 |
| Acorn Fencing & Landscapes Limited | Leigh-On-Sea | 2020 |
| Acorn Fire and Security Contractors Ltd | Market Drayton | 2018 |
| Acorn Garden & Landscaping Services Limited | Leatherhead | 2024 |
| Acorn Garden Services Ltd | Newcastle | 2023 |
| Acorn Gardening & Property Services Limited | Weymouth | 2012 |
| Acorn Gardening and Landscaping Ltd | Southampton | 2021 |
| Acorn Global Consulting Ltd | Northwich | 1997 |
| Acorn Global Recruitment Limited | Newport | 1997 |
| Acorn Global Services Ltd | London | 2016 |
| Acorn Gritting Services Limited | Welwyn Garden City | 2020 |
| Acorn Grounds & Garden Care Ltd | Caterham | 2019 |
| Acorn Grounds Care Limited | East Grinstead | 2016 |
| Acorn Grounds Maintenance and Landscaping Ltd | Manchester | 2024 |
| Acorn Growth Consultants Limited | London | 2025 |
| Acorn Health & Safety Limited | Bristol | 2002 |
| Acorn Healthcare (SW) Ltd | Plymouth | 2022 |
| Acorn Holloway Limited | London | 2017 |
| Acorn Homes (Group) Limited | Ramsgate | 2012 |
| Acorn Hotels Hospitality Limited | London | 2018 |
| Acorn HR Consultancy Limited | Nottingham | 2015 |
| Acorn Independence Limited | Axminster | 2016 |
| Acorn Inventories Limited | Leeds | 2014 |
| Acorn Investigations Limited | Manchester | 1998 |
| Acorn Landscape Services (Cheshire) Limited | Knutsford | 2013 |
| Acorn Landscapes (Cambs) Ltd | Spalding | 2025 |
| Acorn Landscapes (North East) Limited | Morpeth | 2013 |
| Acorn Landscaping & Building Ltd | Doncaster | 2026 |
| Acorn Landscaping (Anglia) Ltd | Bury St. Edmunds | 2007 |
| Acorn Lawn Care Ltd | Leigh | 2014 |
| Acorn Manor Limited | London | 2002 |
| Acorn Office Solutions Limited | Farnham | 2005 |
| Acorn Paving & Landscaping Ltd | Bromley | 2012 |
| Acorn Paving Contractors Ltd | Ruislip | 2025 |
| Acorn Placements Ltd | Wallington | 2025 |
| Acorn Plant & Tool Hire Limited | Tonbridge | 2006 |
| Acorn Plant Hire Limited | Bolton | 2014 |
| Acorn Principle Plus Ltd. | Edinburgh | 2006 |
| Acorn Printing Services Limited | Coventry | 2002 |
| Acorn Property Group Ltd. | Glasgow | 1986 |
| Acorn Quality Services Limited | Birmingham | 2011 |
| Acorn Quality Solutions Limited | Christchurch | 2001 |
| Acorn Rail Limited | Newport | 2009 |
| Acorn Recruitment Limited | Cleppa Park | 1997 |
| Acorn Retail Promotions Limited | Redditch | 2024 |
| Acorn Safety Consultants Ltd | Belper | 2008 |