| Brandon Kevern Driver Services Ltd | Transport & logistics | 2024 |
| Bravegoose Ltd | Administrative & support | 2019 |
| Breckland Beef Ltd | Wholesale & retail | 2020 |
| Breckland Shipping Services Holdings Ltd | Financial services | 2017 |
| Breckland Shipping Services Limited | Transport & logistics | 2000 |
| Breckland Suspended Ceilings Limited | Construction | 2001 |
| Bressingham Car Bodyshop Ltd | Wholesale & retail | 2023 |
| Bressingham Mushrooms Ltd | Agriculture & fishing | 2007 |
| Bressingham Steam Preservation Company Limited | Arts & recreation | 1973 |
| Brian Callin Consulting Ltd | Professional & scientific | 2014 |
| Bridge Venture Limited | Professional & scientific | 2013 |
| Bridge Veterinary Practice Limited | Professional & scientific | 2005 |
| Bridges Enterprise Services Ltd | Administrative & support | 2026 |
| Bridgham Consultancy Limited | Professional & scientific | 2019 |
| Bright Music Futures Ltd | Education | 2019 |
| Brightfields Suffolk Limited | Agriculture & fishing | 2025 |
| British Institute of Professional Dog Trainers | Education | 1995 |
| Broadland ENV. Limited | Administrative & support | 2011 |
| Brome Barns Limited | Hospitality | 2017 |
| Brome Poultry Limited | Agriculture & fishing | 2017 |
| Bronzecraft Limited | Manufacturing | 2015 |
| Brooklands Automobiles Ltd | Wholesale & retail | 2014 |
| Brownie and the Bean Limited | Manufacturing | 2019 |
| Brunwell Ltd | Hospitality | 2022 |
| BSS Property Services Limited | Administrative & support | 2025 |
| Bucher Farms Limited | Agriculture & fishing | 1974 |
| Buildwillow Limited | Extraterritorial | 1983 |
| Bulk Order Buys Ltd | Wholesale & retail | 2022 |
| Burger JAM Ltd | Hospitality | 2019 |
| Burgess Homes Limited | Construction | 2001 |
| Burlington Close Management Company Limited | Households | 1994 |
| Buzzell Properties Ltd | Real estate | 2006 |
| Bvhp Limited | Professional & scientific | 2005 |
| C & a Solutions Ltd | Administrative & support | 2012 |
| C & D Noble Limited | Agriculture & fishing | 2017 |
| C & J Riddell Limited | Manufacturing | 2005 |
| C B Accounting Limited | Extraterritorial | 2024 |
| C B Accounts Ltd | Professional & scientific | 2018 |
| C F Civils Limited | Construction | 2016 |
| C J Countryside Ltd | Agriculture & fishing | 2023 |
| C. a. Edwards Utilities Limited | Construction | 2007 |
| C.A. Rush Limited | Wholesale & retail | 2003 |
| Caledonian Road RTM Company Limited | Hospitality | 2009 |
| Caleton Limited | Professional & scientific | 2003 |
| Calida Tech UK Ltd | Information & communication | 2017 |
| Calido Trading Limited | Manufacturing | 1980 |
| Calton Brothers Contracting Limited | Agriculture & fishing | 2013 |
| Calton Farms Limited | Agriculture & fishing | 2023 |
| CAM Legal Services Ltd | Administrative & support | 2004 |
| Cambridge Kayaks East Limited | Wholesale & retail | 2020 |
| Cambridge Tax Practice Partnership LLP | | 2023 |
| Candia Limited | Wholesale & retail | 2022 |
| Cannons Flooring Limited | Wholesale & retail | 2013 |
| Car Wash Diss Ltd | Administrative & support | 2025 |
| Carbre Ltd | Construction | 2022 |
| Cargo One (UK) Ltd | Real estate | 2010 |
| Carman Property Limited | Extraterritorial | 2010 |
| Carol Walker Technical Services Ltd | Hospitality | 2007 |
| Carrington Yale Ltd | Manufacturing | 2014 |
| Carvel Project Management Ltd | Professional & scientific | 2013 |
| Cash 4 Toners Limited | Wholesale & retail | 2014 |
| Caslam Limited | Professional & scientific | 2012 |
| Castle Colchester Motorcycle Club Ltd | Arts & recreation | 2005 |
| Castle Conservation Ltd | Arts & recreation | 2023 |
| Cawston Carpentry Ltd | Construction | 2018 |
| Caxton House Investments & Developments Ltd | Real estate | 2022 |
| Cdrg Limited | Administrative & support | 2025 |
| Cedar House (Scole) Management Company Limited | Households | 1978 |
| Cellar BOY Limited | Hospitality | 2010 |
| Celluseal Limited | Information & communication | 2024 |
| Central Connect Transport Limited | Transport & logistics | 2016 |
| Cess Rail Consultants Limited | Construction | 2014 |
| CF Prendergast Consultancy Ltd | Professional & scientific | 2025 |
| CG Engineering (Wymondham) Limited | Professional & scientific | 2009 |
| Changejoin Residents Management Limited | Households | 1988 |
| Chapel Doors Limited | Construction | 2003 |
| Chapman Surveyors Ltd | Real estate | 2016 |
| Charndate Limited | Real estate | 2004 |
| Chateau Musar (U.K.) Limited | Wholesale & retail | 1980 |
| Cheeky Charlie Promotions Limited | Manufacturing | 2019 |
| Cherry Tree Court Management (Diss) Limited | Real estate | 1999 |
| Cheung Developments Limited | Administrative & support | 2002 |
| Chilled Down Limited | Hospitality | 2021 |
| Chillspeed Holdings Limited | Transport & logistics | 2013 |
| Chillspeed Limited | Transport & logistics | 2000 |
| Choice Smart Ltd | Hospitality | 2025 |
| Civic Design Partnership Limited | Professional & scientific | 1998 |
| Clancy Holdings Ltd | Construction | 2024 |
| Clapton Therapy Ltd | Health & social care | 2026 |
| Clarity Earwax Removal Ltd | Health & social care | 2024 |
| Clarke Developments Limited | Construction | 1998 |
| Clayton and Jarvill Ltd | Health & social care | 2026 |
| Clickstart.Tech Limited | Information & communication | 2025 |
| Close Engineering Solutions Ltd | Professional & scientific | 2026 |
| Cloud Limited | Information & communication | 2003 |
| CLR Developments Ltd | Construction | 2024 |
| CLR Investments Ltd | Real estate | 2024 |
| CLS Solar Energy UK Ltd | Construction | 2021 |
| Cocosoft Ltd | Information & communication | 2025 |
| Colemans Removals Ltd | Transport & logistics | 2025 |