| 1- 2 Call Work Safe Ltd | Administrative & support | 2010 |
| 1-2 Call Drainage & Groundwork Limited | Construction | 2005 |
| 105 Group Limited | Professional & scientific | 2017 |
| 111 Acquisition Limited | Real estate | 2004 |
| 1545 Housing CIC | Hospitality | 2026 |
| 1616 Media Limited | Information & communication | 2015 |
| 19 Craske Lane Limited | Agriculture & fishing | 2021 |
| 1ST Class Bootcamp Ltd | Arts & recreation | 2022 |
| 2 Portland Street RTM Co. Ltd. | Real estate | 2025 |
| 20 South Street Ltd | Arts & recreation | 2025 |
| 24-7 Self Store Ltd | Transport & logistics | 2018 |
| 24/7 Facilities Management Ltd | Administrative & support | 2021 |
| 27 Limited | Extraterritorial | 2026 |
| 28 Northgate RTM Company Ltd | Households | 2016 |
| 3 Sausages Ltd | Households | 2020 |
| 33 Railway Road Management Company Limited | Administrative & support | 1988 |
| 365 Respawn Ltd | Information & communication | 2025 |
| 3A Steelworks Ltd | Manufacturing | 2024 |
| 4 Way Builders Limited | Construction | 2017 |
| 4 Way Electrical EOT Limited | Administrative & support | 2023 |
| 4 Way Electrical Limited | Construction | 2012 |
| 4 Way Energy Ltd | Professional & scientific | 2014 |
| 4 Way Group Companies Limited | Extraterritorial | 2017 |
| 4 Way Mechanical Limited | Manufacturing | 2017 |
| 4 Way Refrigeration Limited | Manufacturing | 2004 |
| 4 Way Refrigeration Services EOT Limited | Administrative & support | 2023 |
| 4 Way Refrigeration Services Ltd | Manufacturing | 2014 |
| 4041 Ltd | Professional & scientific | 2016 |
| 44 King Street (Management) Limited | Construction | 2007 |
| 46 Greevegate Management Company Limited | Households | 2004 |
| 4C Norfolk Limited | Administrative & support | 2023 |
| 4D Structural Limited | Professional & scientific | 2017 |
| 4WARD Cleaning Services Ltd | Administrative & support | 2019 |
| 5 Portland Street Management Company Ltd | Households | 2015 |
| 55P Ltd | Professional & scientific | 2020 |
| 601 Gold Limited | Hospitality | 2008 |
| 68 Tezgel Properties Ltd | Real estate | 2025 |
| 7 ST James Street (Freehold) Management Company Limited | Households | 2019 |
| 7-13 Friars Walk Management Company Limited | Real estate | 2015 |
| 77 London Road (King's Lynn) Residents Management Limited | Households | 1974 |
| 9 RSY Freehold Limited | Extraterritorial | 2020 |
| A & M Frary Shellfish Limited | Agriculture & fishing | 2013 |
| A & R Pike Interiors Limited | Construction | 2001 |
| A a Massen Trading Limited | Construction | 2013 |
| A C S Architectural Ltd | Professional & scientific | 2012 |
| A Class Services Home and Garden Ltd | Construction | 2024 |
| A Dickerson Builders Ltd | Construction | 2011 |
| A E Thomson (Norfolk) Limited | Financial services | 2021 |
| A E Thomson (UK) Limited | Financial services | 2010 |
| A Egan Property Limited | Real estate | 2020 |
| A Gift of Time Ltd | Wholesale & retail | 2022 |
| A J Seaman Limited | Financial services | 2021 |
| A J Ward Butchers Limited | Wholesale & retail | 2005 |
| A L Sheeting Ltd | Wholesale & retail | 2013 |
| A LA Carte Mgmt Limited | Administrative & support | 2024 |
| A M Mortgages (UK) Limited | Financial services | 2004 |
| A R Electrical & Sons Ltd | Construction | 2022 |
| A R Hannay Ltd | Professional & scientific | 2013 |
| A Reeve Motorsport Limited | Wholesale & retail | 2016 |
| A Reeve Performance Bikes Limited | Wholesale & retail | 2020 |
| A Reeve Performance Limited | Wholesale & retail | 2015 |
| A S Garage Doors Ltd | Construction | 2019 |
| A T Promotions (Holdings) Limited | Manufacturing | 2019 |
| A to Z Electrical and Home Renovations Ltd | Construction | 2024 |
| A W Home Improvements (East Anglia) Ltd | Construction | 2026 |
| A&A Response Security Ltd | Administrative & support | 2022 |
| A&J Transport Cargo Ltd. | Transport & logistics | 2017 |
| A&S Coaches Ltd | Transport & logistics | 2010 |
| A&S Exporting Limited | Wholesale & retail | 2014 |
| A-Craft Limited | Professional & scientific | 2026 |
| A-Z Engineering Services and Spares Ltd | Professional & scientific | 2023 |
| A. B. Cave (Homes) Ltd | Real estate | 2025 |
| A. J. Coggles Family Funeral Directors Limited | Other services | 2022 |
| A.A. Massen Limited | Real estate | 1975 |
| A.A.Inventories Ltd. | Households | 2011 |
| A.B. Chemists Ltd | Wholesale & retail | 1999 |
| A.B. Technical (East Anglia) Limited | Construction | 2019 |
| A.E. Sexton Limited | Agriculture & fishing | 1990 |
| A.M Waste Management Ltd | Water & waste | 2025 |
| A.M. Residential Ltd | Real estate | 2021 |
| A1 Facilities and Work Services Ltd | Administrative & support | 2012 |
| A1 Storage Solutions Limited | Transport & logistics | 2019 |
| A1 Timber Engineering EOT Limited | Administrative & support | 2021 |
| A1 Timber Engineering Limited | Professional & scientific | 2013 |
| A2B Forklift Training Ltd | Education | 2025 |
| A2B Transport (Kings Lynn) Limited | Administrative & support | 2013 |
| Aavagard Law UK Limited | Professional & scientific | 2025 |
| Aavagard LLP | | 2021 |
| Abacus Heating & Plumbing Limited | Construction | 2018 |
| Abbey Barns Management Co. Limited | Households | 1998 |
| Abbotside Holdings Limited | Hospitality | 2015 |
| Able Engineering Limited | Manufacturing | 1987 |
| Able Resource Limited | Other services | 2017 |
| Able Traffic Management Ltd | Construction | 2021 |
| Above and Beyond School Ltd | Education | 2025 |
| Above RD Limited | Wholesale & retail | 2013 |
| Abraxas Academy Limited | Arts & recreation | 2025 |
| ABS Fitness Fakenham Ltd | Arts & recreation | 2022 |
| ABS Gym Fakenham Ltd | Arts & recreation | 2022 |
| ABS Gym Ltd | Arts & recreation | 2022 |