| 2 and 4 Grove Farm Barns Sculthorpe Limited | Extraterritorial | 2011 |
| 209 New Kings Road Management Limited | Households | 1974 |
| 3HS Enterprises Limited | Hospitality | 2016 |
| 5 Star Scaffolding Limited | Construction | 2016 |
| 741 Awards Limited | Wholesale & retail | 2001 |
| 7CS Group Limited | Manufacturing | 2026 |
| A J S Plumbing & Heating Limited | Construction | 2003 |
| A O H Personnel Ltd | Administrative & support | 2010 |
| A&Tu Property Limited | Construction | 2020 |
| A. & B. Management Services Limited | Real estate | 1949 |
| A. S. Hall Builders & Contractors Limited | Construction | 2009 |
| A.O.T Engineering Holdings Ltd | Manufacturing | 2018 |
| A.O.T Engineering Ltd | Manufacturing | 2012 |
| Aaiq Associates Ltd | Real estate | 2015 |
| Abbey Corinthian Games Company Ltd. | Manufacturing | 1959 |
| Absolute Defence Ltd | Professional & scientific | 2015 |
| Acquired Living Limited | Real estate | 2020 |
| ACR Leisure Limited | Hospitality | 2003 |
| Active Engineering Systems Limited | Wholesale & retail | 2018 |
| Active Fakenham Ltd | Other services | 2012 |
| ADA Automotive Ltd | Wholesale & retail | 2016 |
| AER Consulting Services Limited | Administrative & support | 2022 |
| Agnew and Partners Ltd | Real estate | 2025 |
| Agrisellex UK Limited | Wholesale & retail | 2010 |
| AGW Properties Limited | Real estate | 2017 |
| AHF Foods Limited | Hospitality | 2021 |
| Aldwych Developments Limited | Construction | 2014 |
| Aldwych House Limited | Real estate | 2017 |
| Aldwych House Services Ltd. | Administrative & support | 2003 |
| ALL the RAJ Ltd | Wholesale & retail | 2024 |
| Almoore.Org Limited | Health & social care | 2019 |
| Ambience Renewables and Renovations Ltd | Construction | 2020 |
| Andrew Morton Associates Limited | Professional & scientific | 2006 |
| Anglia Heating Training Limited | Construction | 2015 |
| Anglia Laser Cleaning Limited | Administrative & support | 2025 |
| Anglo Scottish Equipment (Southern) Ltd. | Wholesale & retail | 1989 |
| ANY Old Limited | Wholesale & retail | 2023 |
| Apple Hair Design Limited | Other services | 2019 |
| APW Plumbing & Heating (U.K.) Ltd | Construction | 2019 |
| Arca Preservation Ltd | Arts & recreation | 2022 |
| Arcadia Cottages Ltd | Real estate | 2019 |
| Arcadia Home and Living Limited | Wholesale & retail | 2009 |
| Arcadia Home Heating Limited | Extraterritorial | 2020 |
| Arch Security Limited | Administrative & support | 2024 |
| Argee (London) Limited | Administrative & support | 1947 |
| Arkhouse Ltd | Information & communication | 2002 |
| Armstrong Pubs Limited | Hospitality | 2011 |
| Armward Ltd | Construction | 2022 |
| AS Diecast Models Ltd | Wholesale & retail | 2026 |
| ASB Design & Build Ltd | Construction | 2019 |
| Ashby Decorators Ltd | Construction | 2026 |
| Ashman Plumbing & Heating Ltd | Construction | 2025 |
| Ashworth Dahle Ltd | Professional & scientific | 2021 |
| Ashworths | | 1991 |
| Asiatic (UK) Limited | Wholesale & retail | 1998 |
| Astra Window Cleaning Ltd | Administrative & support | 2021 |
| Augusta Street Properties Ltd | Real estate | 2015 |
| Aurulum Art Limited | Wholesale & retail | 2021 |
| Auto Elettrica Limited | Wholesale & retail | 2008 |
| Autumnwood Arboriculture and Ecology Ltd | Professional & scientific | 2025 |
| AWC Norfolk Ltd | Administrative & support | 2026 |
| Aygun Management Ltd | Real estate | 2025 |
| Ayling Heritage Limited | Real estate | 2020 |
| Aylsham Developments Limited | Real estate | 2015 |
| B & C Farming Limited | Agriculture & fishing | 2019 |
| B & E Dack Builders LLP | | 2014 |
| B U G Cleaning Services Ltd | Administrative & support | 2025 |
| Back 2 Track Limited | Other services | 2012 |
| Bang in Wells Limited | Hospitality | 2014 |
| Barnes Driving Limited | Transport & logistics | 2015 |
| Barnhams Automation Limited | Professional & scientific | 2009 |
| Barnhams Electrical Company Limited | Construction | 1946 |
| Batterby Green Management Company Limited | Real estate | 1991 |
| BEE 16 Cleaning Ltd | Administrative & support | 2026 |
| BEE 67 Cleaning Ltd | Administrative & support | 2026 |
| Beechwood Landscapes Limited | Administrative & support | 2026 |
| Benatison Properties Limited | Construction | 2024 |
| Benstead Abbey Resources Ltd | Wholesale & retail | 2024 |
| Berk Hound Forge Ltd | Extraterritorial | 2022 |
| Bethari Limited | Professional & scientific | 2013 |
| Bezert Limited | Real estate | 2021 |
| Bidewells Limited | Hospitality | 2006 |
| Big Bidz Competitions Ltd | Arts & recreation | 2020 |
| Bill Cleyndert & Company Limited | Manufacturing | 1999 |
| Bill Cleyndert & Company USA Limited | Real estate | 2022 |
| Bill Cleyndert Holdings Ltd | Financial services | 2016 |
| Birdie Fortescue Ltd | Wholesale & retail | 2014 |
| Black Dog Computer Services Ltd | Wholesale & retail | 2018 |
| Black Lion Hotels Limited | Real estate | 2013 |
| Black Shuck Ltd | Manufacturing | 2015 |
| Blackwell Construction Ltd | Transport & logistics | 2023 |
| Blakeney Marine Services Limited | Manufacturing | 2011 |
| Bliss Space Limited | Administrative & support | 2008 |
| Bloom Accountants Limited | Professional & scientific | 2021 |
| Bluebell Laundry & Linen Hire Ltd | Other services | 2025 |
| Bluegrass Property Limited | Real estate | 2019 |
| Bluest Blues Ltd | Education | 2024 |
| Blyth Agricultural Services Limited | Professional & scientific | 2019 |
| Bracken Pest Control Limited | Other services | 2017 |
| Brancaster Stays LLP | | 2018 |