| A&J Barbers Norwich Ltd | Other services | 2023 |
| A&J Care Limited | Health & social care | 2020 |
| A&J Event Services Ltd | Administrative & support | 2025 |
| A&K Refurbishment Ltd | Construction | 2022 |
| A&L Jackson Ltd | Real estate | 2025 |
| A&M Solutions 4 U Ltd | Transport & logistics | 2022 |
| A&M Properties Norwich Ltd | Real estate | 2026 |
| A&M Property (East) Ltd | Real estate | 2025 |
| A&M Scaffolding Norfolk Ltd | Construction | 2018 |
| A&P Transport 25 Ltd | Transport & logistics | 2025 |
| A&R Carpentry Group Limited | Construction | 2022 |
| A&S Property & Rentals Limited | Real estate | 2026 |
| A&W 24 Ltd | Hospitality | 2024 |
| A&Y Engineers Ltd | Professional & scientific | 2021 |
| A&Y Tailoring Ltd | Other services | 2025 |
| A+ Electrical Limited | Construction | 2003 |
| A-List Finishing Ltd | Wholesale & retail | 2006 |
| A-Team Consulting Limited | Other services | 2001 |
| A-Ward Web Services Ltd | Information & communication | 2025 |
| A-Z Holdings Ltd | Financial services | 2019 |
| A. & T. Pritchard Limited | | 1979 |
| A. and S. Circuits Limited | Professional & scientific | 1992 |
| A. Farrell Contracting Ltd | Agriculture & fishing | 2019 |
| A. Howard & SON Ltd | Construction | 2021 |
| A. J. L. Holdings Norfolk Limited | Financial services | 2018 |
| A. Pank & SON Limited | Extraterritorial | 2006 |
| A.& W.Cushion Limited | Wholesale & retail | 1937 |
| A.A.S. Medical Services Limited | Health & social care | 2025 |
| A.C. Bacon Engineering (Holdings) Ltd | Financial services | 2016 |
| A.C. Environmental Services Limited | Construction | 1986 |
| A.C. Leigh Ltd | Extraterritorial | 2013 |
| A.C.Bacon Engineering Limited | Manufacturing | 1961 |
| A.C.P. Carpentry Ltd | Construction | 2010 |
| A.C.P. Farming Ltd | Agriculture & fishing | 2017 |
| A.G. Security (Norwich) Limited | Administrative & support | 2016 |
| A.H. Plumbing and Heating Services Limited | Construction | 2009 |
| A.J Cooper (Builders) Ltd | Construction | 2002 |
| A.J. Lloyd Limited | Agriculture & fishing | 2009 |
| A.J. Mcdonough (Electrical Engineering) Limited | Professional & scientific | 1999 |
| A.M.A. Fennell Frics Limited | Financial services | 2008 |
| A.M.F. Developments Limited | Administrative & support | 2002 |
| A.O Electrical Design Consultants Limited | Professional & scientific | 2012 |
| A.P. Vehicle Services (East Anglia) Ltd | Wholesale & retail | 2024 |
| A.P.I. Engineering Limited | Wholesale & retail | 2000 |
| A.R.Khan Limited | Hospitality | 2017 |
| A.R.M. Maritime Services Limited | Manufacturing | 2016 |
| A.S.L Offshore Services (UK) Ltd | Administrative & support | 2012 |
| A.Sillett Tree Surgeon Ltd | Agriculture & fishing | 2017 |
| A.W.Ramsey(Coachworks)Limited | Real estate | 1965 |
| A1 Car Care Centre Limited | Wholesale & retail | 2004 |
| A1 Engraving Limited | Wholesale & retail | 2008 |
| A1 Home and Garden Care Ltd | Water & waste | 2023 |
| A1 Insulation Services (Eastern) Ltd | Construction | 2011 |
| A1 Insulation Services Limited | Wholesale & retail | 2003 |
| A1 Motoring Limited | Wholesale & retail | 2002 |
| A1 Pavings Limited | Construction | 2018 |
| A1 Solutions East Ltd | Professional & scientific | 2018 |
| A11 Developments Ltd | Manufacturing | 2025 |
| A11 World Food Restaurant Ltd | Hospitality | 2024 |
| A1M Design Solutions Limited | Administrative & support | 2007 |
| A28 Group Ltd | Financial services | 2025 |
| A2A Cleaning Service Limited | Administrative & support | 2022 |
| A2B Care Staffing Ltd | Administrative & support | 2026 |
| A2B Taxis Norwich Limited | Transport & logistics | 2021 |
| A2B Windows&Doors Ltd | Construction | 2026 |
| A2E2 Education Ltd | Education | 2014 |
| A2Z Riders Ltd | Transport & logistics | 2017 |
| A3 Atelier Ltd | Professional & scientific | 2020 |
| A3 Taxis Ltd | Transport & logistics | 2026 |
| A5A5AA555OO Ltd | Information & communication | 2026 |
| A94 Technologies Limited | Wholesale & retail | 2021 |
| AA & R Residential Limited | Real estate | 2026 |
| AA & SM Bennett Ltd | Construction | 2004 |
| AA Asset Group Ltd | Financial services | 2025 |
| AA George Enterprise Ltd | Real estate | 2020 |
| AA Pipework and Fabrication Ltd | Manufacturing | 2023 |
| AA Sheet Metal Limited | Manufacturing | 2002 |
| Aa&Da Construction Ltd | Construction | 2017 |
| AAA Smart Repair Limited | Wholesale & retail | 2003 |
| Aaghostmarketing Ltd | Professional & scientific | 2025 |
| Aahad 22 Ltd | Hospitality | 2022 |
| Aakarshan Technologies Limited | Information & communication | 2019 |
| Aamk Limited | Health & social care | 2022 |
| AAN Ltd | Extraterritorial | 2024 |
| AAR Enterprises Limited | Wholesale & retail | 2017 |
| Aards Cards Ltd | Wholesale & retail | 2022 |
| Aaron Rentals Ltd | Real estate | 2021 |
| Aaron Wheaton Limited | Hospitality | 2019 |
| Aaron Windows Limited | Construction | 2001 |
| Aash International Ltd | Wholesale & retail | 2026 |
| AB Mobile Mechanics Ltd | Wholesale & retail | 2023 |
| AB Motors Car Sale Ltd | Wholesale & retail | 2025 |
| AB Samuel Ltd. | Health & social care | 2019 |
| AB Shoptok Limited | Wholesale & retail | 2026 |
| AB Sons Construction Limited | Construction | 2023 |
| ABA MED Ltd | Health & social care | 2023 |
| ABA Procurement Ltd | Professional & scientific | 2012 |
| ABA Training Ltd | Education | 2020 |
| Abab Norwich Limited | Other services | 2024 |
| Abacus Security Norwich Limited | Administrative & support | 2003 |