| Brewer and Bear Ltd | Hospitality | 2018 |
| Brewhahapubs Ltd | Hospitality | 2021 |
| Bridge Classic Cars Competitions Ltd | Arts & recreation | 2023 |
| Bridge Classic Cars Holdings Ltd | Manufacturing | 2004 |
| Bridge Farm Plants Ltd | Wholesale & retail | 2011 |
| Bridge House Rentals Limited | Real estate | 2026 |
| Bridgetones Limited | Other services | 2003 |
| Brie Harrison Limited | Arts & recreation | 2014 |
| Bright Light Homes Limited | Real estate | 2025 |
| Bright Trainers Ltd | Professional & scientific | 2021 |
| Bright Write Ltd | Education | 2025 |
| Brightwell Partnership Ltd | Administrative & support | 2018 |
| Broad Reach Consulting Services Limited | Professional & scientific | 2004 |
| Broadleigh Ltd | Professional & scientific | 2009 |
| Broadwater Machinery Limited | Wholesale & retail | 1984 |
| Broadwell Associates Limited | Information & communication | 2006 |
| Brown Anaesthetics Ltd | Health & social care | 2019 |
| Browns Property Group Limited | Real estate | 2019 |
| Broxtead Housing Trust Limited | Real estate | 1964 |
| Bruizer Limited | Information & communication | 2004 |
| Buckingham and Thompson Ltd | Hospitality | 2011 |
| Buckland Ventures Limited | Financial services | 2024 |
| Budinger Consulting Limited | Professional & scientific | 2021 |
| Buhr Bespoke Interiors Limited | Manufacturing | 2020 |
| Buildmoore Services Ltd | Construction | 2014 |
| Buildyourleads Ltd | Professional & scientific | 2025 |
| Bulldog 3D Sound Ltd | Administrative & support | 2016 |
| Bullride Management Company Limited | Households | 2018 |
| Bunkport Limited | Professional & scientific | 2018 |
| Burden Bros Agri Limited | Wholesale & retail | 2007 |
| Business Evolution, Advancement and Training Limited | Professional & scientific | 2002 |
| BY George Homes Limited | Construction | 2014 |
| Byabi Ltd | Professional & scientific | 2025 |
| Byers Management Limited | Other services | 2012 |
| Bygrove Ltd | Arts & recreation | 2025 |
| Byres Property Solutions Ltd | Real estate | 2021 |
| C & J Stanley Limited | Transport & logistics | 2015 |
| C & L International Consultancy Limited | Real estate | 2015 |
| C and M Driving Services Ltd | Transport & logistics | 2015 |
| C W Cornish & Sons Ltd | Construction | 2023 |
| C.H.W. Developments Limited | Administrative & support | 2008 |
| C2 Investments Ltd. | Real estate | 2008 |
| C9 JPF Ltd | Other services | 2025 |
| CAFE1975 Limited | Hospitality | 2025 |
| Café 66 Suffolk C.I.C. | Hospitality | 2022 |
| Cajetan Executive Search Ltd | Administrative & support | 2016 |
| Callan Logistics Ltd | Administrative & support | 2017 |
| Callen Aviation Limited | Real estate | 2021 |
| Cambourne Self Storage Ltd | Other services | 2010 |
| Cambridge Area Training Ltd | Other services | 2007 |
| Cameo Leisure Parks Limited | Hospitality | 2011 |
| Camrouxpmc Ltd | Construction | 2018 |
| Candeo Smart Ltd | Wholesale & retail | 2021 |
| Canharis Limited | Real estate | 1973 |
| Capital Community Developments Limited | Construction | 2015 |
| Capital Community Homes Limited | Real estate | 2020 |
| Capital Futures Limited | Professional & scientific | 2010 |
| Caprice Ventures Limited | Extraterritorial | 2024 |
| Carbiner Limited | Wholesale & retail | 2019 |
| Cardinal Chambers Ltd | Professional & scientific | 2013 |
| Carley Hill Hair Ltd | Other services | 2026 |
| Carnelian Advisors Limited | Professional & scientific | 2022 |
| Caroline Hughes-Lewis Ltd | Professional & scientific | 2022 |
| Carter Marine Limited | Professional & scientific | 1999 |
| Cartwright Property Associates Ltd | Other services | 2013 |
| Case-Sera Wines Ltd. | Administrative & support | 2018 |
| Castle Acre (Framlingham) Management Company Limited | Water & waste | 2011 |
| Castle Fulfilment Ltd | Administrative & support | 2021 |
| Castle Psychology Ltd | Health & social care | 2022 |
| Castle Reach (Framlingham) Management Company Limited | Real estate | 2011 |
| Catalina Close (Halesworth) Management Company Limited | Households | 2022 |
| Catseye Leadership Development Ltd | Administrative & support | 2019 |
| Cavell Close Bawdsey Management Limited | Real estate | 2010 |
| Celia Mason Wealth Management Ltd | Financial services | 2015 |
| Central Maltings (Woodbridge) Limited | Households | 2004 |
| Centreline Automatic Doors Limited | Manufacturing | 2000 |
| Centreline Door Systems Limited | Financial services | 2021 |
| Centreline Machine Guards Limited | Manufacturing | 2002 |
| Cerallon Limited | Information & communication | 2013 |
| Cessna 172 Ltd | Professional & scientific | 2019 |
| Ceta Limited | Administrative & support | 2025 |
| CFB Global Ltd | Financial services | 2024 |
| Cfbuk Network Ltd | Financial services | 2020 |
| Cfbuk Secured Finance Ltd | Financial services | 2025 |
| CG & NJ Holdings Limited | Financial services | 2018 |
| CGM Global Supplies Ltd | Wholesale & retail | 2015 |
| CH Corporate Services Ltd | Professional & scientific | 2012 |
| Chalke Estates Ltd | Construction | 2021 |
| Chambers Close Management Company Limited | Households | 2015 |
| Chantry (Ipswich) Limited | Real estate | 1969 |
| Chantry Barns Management Limited | Households | 2005 |
| Chantry Meadow Residents Management Company Ltd | Households | 2024 |
| Chapelfield (Orford) Limited | Households | 1996 |
| Charles Clarke & SON (Builders) Holdings Limited | Professional & scientific | 2013 |
| Charles Clarke & SON (Builders) Limited | Construction | 1981 |
| Charles Clarke & SON (Grundisburgh) Holdings Limited | Professional & scientific | 2013 |
| Charles Clarke & SON (Grundisburgh) Limited | Construction | 1981 |
| Charlotte Crofts & Co Ltd | Manufacturing | 2021 |
| Chec Developments Limited | Construction | 2011 |
| Chec Lettings Limited | Real estate | 2018 |