| ACC Hinckley Ltd | Hospitality | 2019 |
| ACC Scaffolding Ltd | Construction | 2025 |
| Acceleration Consulting Limited | Wholesale & retail | 2018 |
| Accent Design Group Limited | Information & communication | 2002 |
| Accentrix Limited | Professional & scientific | 2023 |
| Accentuate Group Ltd | Financial services | 2019 |
| Access 2 Comfort Limited | Professional & scientific | 2013 |
| Access Arboriculture Limited | Other services | 2014 |
| Access Community Trust | Other services | 2010 |
| Access Diagnostic Tests UK Limited | Wholesale & retail | 2003 |
| Accessible Building Solutions Limited | Construction | 2011 |
| Accommodation Norwich Ltd | Administrative & support | 2024 |
| Accopay Ltd | Administrative & support | 2026 |
| Accosmart Limited | Professional & scientific | 2023 |
| Accountancy 121 Holdings Limited | Professional & scientific | 2012 |
| Accountancy 121 Limited | Professional & scientific | 2019 |
| Accountancy Plus & Payroll People Limited | Professional & scientific | 2003 |
| Accountancysquad Ltd | Professional & scientific | 2023 |
| Accounting Associates Norwich Limited | Professional & scientific | 2018 |
| Accounting Forward Ltd | Professional & scientific | 2022 |
| Accounting Solutions Plus Limited | Professional & scientific | 2007 |
| Accubolt Geomatics Ltd. | Professional & scientific | 2018 |
| Accuturn Limited | Manufacturing | 2008 |
| Accuvis Radiology Ltd | Health & social care | 2021 |
| Acdera Building Consultancy Ltd | Professional & scientific | 2025 |
| Ace Consulting Enterprises Ltd | Professional & scientific | 2024 |
| Ace Contract Maintenance Limited | Construction | 2008 |
| Ace Contractors (East Anglia) Ltd | Construction | 2020 |
| Ace Engraving Limited | Other services | 2002 |
| Ace Fire Limited | Manufacturing | 1999 |
| Ace Global Trading Limited | Administrative & support | 2014 |
| Ace Health Ltd | Health & social care | 2025 |
| Ace Housing Solutions Ltd | Real estate | 2019 |
| Ace Ironworks Ltd | Manufacturing | 2018 |
| Ace Metal Supplies Limited | Manufacturing | 2020 |
| Ace of Shades Ltd | Construction | 2017 |
| Ace of Spades Gardens Limited | Agriculture & fishing | 2010 |
| Ace Surfaces Limited | Professional & scientific | 2009 |
| Ace Tubular Services Limited | Professional & scientific | 2002 |
| Ace&D Ltd | Administrative & support | 2021 |
| Acer Prime Law Limited | Professional & scientific | 2017 |
| Acer Property Management Norfolk Ltd | Households | 2025 |
| Acerspire Limited | Real estate | 2015 |
| Acerve Ltd | Construction | 2010 |
| Achievement Holdings Limited | Financial services | 2026 |
| Achievement Training & Skills Ltd | Education | 2015 |
| Achiever Academy Limited | Information & communication | 2025 |
| Achor Limited | Real estate | 2003 |
| Acjul Ltd | Administrative & support | 2023 |
| ACL Swaffham Limited | Construction | 2026 |
| Acle A'S Classic VW Campervan Hire Ltd | Administrative & support | 2020 |
| Acle Bridge Limited | Hospitality | 2015 |
| Acle Car Centre Limited | Wholesale & retail | 2011 |
| Acle Dental Surgery Ltd | Health & social care | 2019 |
| Acle Express Company Ltd | Wholesale & retail | 2023 |
| Acle Home Improvements Ltd | Construction | 2022 |
| Acle Motor Company Ltd | Wholesale & retail | 2024 |
| Acle Oaks Management Company Limited | Households | 2021 |
| Aclmh Ltd | Hospitality | 2024 |
| ACM (Asset Management) Limited | Energy | 2023 |
| ACM Developments (NFK) Ltd | Construction | 2022 |
| Acme Aviation Limited | Manufacturing | 2013 |
| Acms (Moray) Limited | Professional & scientific | 2010 |
| Acms Training Ltd | Professional & scientific | 2026 |
| ACN Enterprise Limited | Wholesale & retail | 2024 |
| Acorn 2 Oak Care Limited | Health & social care | 2022 |
| Acorn Building Services Norfolk Ltd | Construction | 2008 |
| Acorn Cleaning Services Limited | Administrative & support | 2000 |
| Acorn Driver Training Limited | Education | 2010 |
| Acorn Electrical and Home Improvement Ltd | Construction | 2021 |
| Acorn Evolution Marketing Ltd | Information & communication | 2015 |
| Acorn Fireproofing Ltd | Construction | 2024 |
| Acorn Games Advertising Ltd | Professional & scientific | 2018 |
| Acorn Psychiatry and Wellbeing Limited | Health & social care | 2026 |
| Acorn to Oak Initiative Limited | Professional & scientific | 2026 |
| Acorn to Oak Landscaping Ltd | Administrative & support | 2020 |
| Acornford Hampshire Limited | Construction | 1998 |
| ACP Foods Ltd | Wholesale & retail | 2018 |
| ACP Land Surveys Limited | Professional & scientific | 2025 |
| ACP Support (Aylsham) Ltd | Arts & recreation | 2018 |
| Acpms Limited | Professional & scientific | 2007 |
| Acquah 5 Stars Enterprise Limited | Real estate | 2019 |
| ACR Services Limited | Professional & scientific | 2016 |
| ACR Trans Ltd | Transport & logistics | 2016 |
| Acre Joinery Limited | Manufacturing | 1977 |
| Acre Land Partners Ltd | Professional & scientific | 2026 |
| Acre's Consultancy UK Ltd | Professional & scientific | 2019 |
| Acreage Properties Ltd | Real estate | 2017 |
| Acreage Recruitment Ltd | Administrative & support | 2019 |
| Acrometis Ltd | Other services | 2017 |
| Acrometis Solutions Limited | Other services | 2017 |
| ACS Paws Ltd | Professional & scientific | 2024 |
| ACS Roofing & Property Maintenance Limited | Construction | 2024 |
| ACS Solar Ltd | Construction | 2023 |
| Acssis Ltd | Professional & scientific | 2016 |
| ACT Solicitors Ltd | Professional & scientific | 2011 |
| Actagen Limited | Professional & scientific | 2016 |
| Acteon Group Limited | Professional & scientific | 2001 |
| Acteon Group Operations (UK) Limited | Professional & scientific | 2024 |
| Acteon Group Properties Limited | Real estate | 2008 |