| Ben-Bec Plant Services Ltd | Construction | 1999 |
| Ben-Bec Services Limited | Administrative & support | 2015 |
| Benedict Marketing Ltd | Professional & scientific | 2014 |
| Berry Advanced Limited | Mining & quarrying | 2014 |
| Best Indian Food Limited | Hospitality | 2023 |
| Bevan Brothers Ltd | Manufacturing | 2019 |
| Bevan Davidson International Ltd | Professional & scientific | 2015 |
| Big Bear Construction Group Limited | Financial services | 2025 |
| Big Jump Inflatables Ltd | Arts & recreation | 2023 |
| Bishops Drive (Brandon Road) Limited | Households | 2020 |
| BJJ Corporation Limited | Administrative & support | 2023 |
| BJM Veterinary Ltd | Professional & scientific | 2025 |
| Blackburne Motorcycles Ltd | Manufacturing | 2024 |
| Blackgraphic UK Limited | Professional & scientific | 2010 |
| Blackmore Engineering Services Ltd | Professional & scientific | 2018 |
| Bleu Estates Ltd | Real estate | 2025 |
| Blue Star Vehicle Services Ltd | Wholesale & retail | 2016 |
| BM Hospitality Limited | Hospitality | 2019 |
| Bonza Country Limited | Wholesale & retail | 2008 |
| Boxcouk Limited | Manufacturing | 2015 |
| BR03GAS Ltd | Hospitality | 2026 |
| Bramham Electrical Limited | Construction | 2007 |
| Brand Film Works Ltd | Arts & recreation | 2018 |
| Breckland Brakers Ltd | Wholesale & retail | 2026 |
| Breckland Finishing Limited | Manufacturing | 2011 |
| Breckland Meadows Caravan Park Limited | Hospitality | 2025 |
| Brent Trading Limited | Health & social care | 2021 |
| Bridge the GAP Counselling Ltd | Health & social care | 2024 |
| Bright Recruitment Services Limited | Administrative & support | 2026 |
| Bright's Cleaning Services (UK) Limited | Administrative & support | 2003 |
| Bright's Constructing Services Ltd | Construction | 2026 |
| Bright's Facilities Management Limited | Real estate | 2020 |
| Brights Construction Services Limited | Construction | 2013 |
| British Society of Cardiovascular Magnetic Resonance | Other services | 2004 |
| Broadband Telephony Voip Auditing Limited | Information & communication | 2012 |
| Brookers Road Limited | Real estate | 2022 |
| BTF Holiday Lets Ltd | Other services | 2019 |
| Building Endeavours Limited | Construction | 2018 |
| Bunting & SON Holdings Ltd | Financial services | 2025 |
| Bunting Properties Ltd | Real estate | 2025 |
| Burlinghams Groundworks and Plant Hire Limited | Administrative & support | 2005 |
| BVB International Ltd | Manufacturing | 2019 |
| BW Electrical King's Lynn Limited | Construction | 2018 |
| C P Smith Holdings Limited | Financial services | 2023 |
| C P Smith Investments Limited | Financial services | 2023 |
| C&H Cleaning Services Limited | Administrative & support | 2025 |
| C.U.Electrical Services Ltd | Construction | 2016 |
| Cabbi Scoot Limited | Manufacturing | 2019 |
| Cam-Era Rental Co Limited | Administrative & support | 2011 |
| CAP IT ALL Media Limited | Professional & scientific | 2024 |
| Cape Amethyst Ltd | Other services | 2012 |
| Carcade Limited | Wholesale & retail | 2026 |
| Carter & Co Property Consultants Limited | Financial services | 2020 |
| Cast & Mint Ltd | Administrative & support | 2016 |
| Cato Electrical Limited | Construction | 2021 |
| CB Build & Construct Limited | Construction | 2010 |
| CC Wired Limited | Construction | 2024 |
| CFT Safety Ltd | Professional & scientific | 2024 |
| CGM Industries Ltd | Manufacturing | 2024 |
| Chalfont Building Limited | Construction | 2021 |
| Chaplin Advisory Ltd | Professional & scientific | 2025 |
| Charlie Snell Ltd | Wholesale & retail | 2022 |
| CHI Coaching Limited | Professional & scientific | 2004 |
| Chickston Litho Limited | Manufacturing | 2009 |
| Chimney Warehouse Ltd | Wholesale & retail | 2024 |
| Choice Homewares Ltd | Wholesale & retail | 2023 |
| Choicequote Limited | Real estate | 1974 |
| Chopsticks Watton Ltd | Hospitality | 2019 |
| CHR International Projects Limited | Administrative & support | 2025 |
| Christyana Fabrics & Blinds Limited | Wholesale & retail | 2018 |
| Church Mews Limited | Households | 2002 |
| City Scoot Ltd | Transport & logistics | 2017 |
| CJT Fabrication Limited | Manufacturing | 2010 |
| Clark-Nicol Limited | Arts & recreation | 2015 |
| Clean Water International (UK) Limited | Water & waste | 2007 |
| Clean Water International Limited | Water & waste | 2004 |
| Clenshaw Minns Ltd | Professional & scientific | 2000 |
| Clock Systems Service Ltd | Wholesale & retail | 2026 |
| Cloud Nine Gems Limited | Wholesale & retail | 2015 |
| Cloudwood Consulting Ltd | Professional & scientific | 2023 |
| CMD Ctrl Limited | Information & communication | 2013 |
| Coastal KOI Limited | Wholesale & retail | 2006 |
| Coastal Project 01 Norwich Ltd | Construction | 2024 |
| Coastal Project 02 Fakenham Ltd | Construction | 2024 |
| Cockley Cley Water LLP | | 2015 |
| Colour-Coded Scaffolding Supplies Limited | Construction | 2025 |
| Coltishall Clinic Limited | Health & social care | 2011 |
| Comaserve CMS UK Limited | Construction | 2020 |
| Comaserve Limited | Construction | 2016 |
| Compactor Rentals Limited | Administrative & support | 1994 |
| Complete Commercial Finance Limited | Administrative & support | 2019 |
| Complete Compliance Global Ltd | Professional & scientific | 2025 |
| Concepti Limited | Extraterritorial | 2015 |
| Concierged Care Limited | Health & social care | 2010 |
| Concierged Health Care Limited | Health & social care | 2011 |
| Connaught Motor Co (2014) Ltd | Manufacturing | 2013 |
| Connaught Motorcycles Ltd | Manufacturing | 2020 |
| Construction Cutting Solutions Ltd | Wholesale & retail | 2020 |
| Cook Carpentry and Joinery Ltd | Manufacturing | 2021 |
| Corry Capital Advisors Limited | Financial services | 2006 |