| Butcher Holdings Ltd | Financial services | 2023 |
| Butterfield Meadows (Hunstanton) Management Company Limited | Households | 2017 |
| Butterfly World Project (Holdings) Limited | Professional & scientific | 2010 |
| Butterfly World Project Limited | Administrative & support | 2008 |
| Butterman Bay Tech Limited | Information & communication | 2016 |
| Butterworths Property Services Limited | Real estate | 2016 |
| Button Electrical Services Ltd | Construction | 2007 |
| Button Repairs and Transport Services Limited | Wholesale & retail | 2010 |
| Button Sand Nominees | Professional & scientific | 2003 |
| Buxton & Grey Ltd | Real estate | 2018 |
| Buy & LET Solutions Ltd | Real estate | 2026 |
| Buy in Results Limited | Administrative & support | 2009 |
| Buyon Motors Ltd | Wholesale & retail | 2025 |
| Buysell Used Car Parts Platform Ltd | Wholesale & retail | 2024 |
| Buzz Smart Electrical Ltd | Construction | 2025 |
| Buzzflyer Limited | Wholesale & retail | 2006 |
| Bvali Ltd | Wholesale & retail | 2021 |
| BVM Bonsai Ltd | Wholesale & retail | 2023 |
| BVS Logistic Ltd | Transport & logistics | 2021 |
| BW Brickworks & SON Limited | Construction | 2013 |
| BWI05 Limited | Arts & recreation | 2026 |
| BWN Limited | Administrative & support | 2019 |
| BWN Properties Ltd | Real estate | 2020 |
| Bwob Ltd | Wholesale & retail | 2022 |
| BY Raisin Limited | Wholesale & retail | 2025 |
| BY US for US About US Ltd | Information & communication | 2021 |
| Byadya Drive Ltd | Transport & logistics | 2025 |
| Byaly Limited | Transport & logistics | 2025 |
| BYE2018 Limited | Real estate | 2018 |
| Byerley Turk Ltd | Professional & scientific | 2019 |
| BYG Property Limited | Real estate | 2021 |
| Byker Grove Limited | Real estate | 2021 |
| Byres Solutions Limited | Professional & scientific | 2015 |
| Byron Dean Property Ltd | Real estate | 2020 |
| Byteweb Limited | Information & communication | 2024 |
| C & a Roofing (Ipswich) Limited | Construction | 2016 |
| C & a Sales U.K. Ltd. | Wholesale & retail | 2020 |
| C & J Coaches Ltd. | Education | 2019 |
| C & K Studios Ltd | Professional & scientific | 2018 |
| C & L Construction Ltd | Construction | 2017 |
| C & L Holdings (Suffolk) Limited | Financial services | 2022 |
| C & L Telecoms Limited | Information & communication | 2021 |
| C & L TM Division Limited | Construction | 2021 |
| C & P Electrical Services (Ipswich) Ltd | Construction | 2012 |
| C & S Plant Limited | Administrative & support | 2009 |
| C a N R Limited | Professional & scientific | 2017 |
| C Amoss Plumbing & Heating Limited | Construction | 2026 |
| C and F Vehicle Services Ltd | Wholesale & retail | 2025 |
| C C Ipswich Limited | Wholesale & retail | 2008 |
| C D C Environmental Limited | Construction | 2007 |
| C Grimsey Highways Ltd | Construction | 2024 |
| C H Air & Pump Services Limited | Manufacturing | 1995 |
| C J a Marine Services Limited | Manufacturing | 2009 |
| C J Hunt Limited | Other services | 2013 |
| C J Motor Tech Ltd | Wholesale & retail | 2022 |
| C J Office Interiors Limited | Transport & logistics | 2002 |
| C K a Groundworks Limited | Construction | 2019 |
| C L Williams Facilities Limited | Arts & recreation | 2019 |
| C M Carpentry Ltd | Manufacturing | 2025 |
| C Macken Building Contractors Ltd | Construction | 2022 |
| C P H Farriery Limited | Other services | 2006 |
| C P U (Holdings) Limited | | 1986 |
| C R D Storage Solutions Ltd | Other services | 2023 |
| C S a Furniture Limited | Manufacturing | 2000 |
| C Savoy Stocks Trading Ltd | Financial services | 2024 |
| C Withey Limited | Health & social care | 2016 |
| C&B Studio Limited | Professional & scientific | 2022 |
| C&F Forwarding Limited | Transport & logistics | 2021 |
| C&H Forwarding Ltd | Transport & logistics | 2019 |
| C&J Global Healthcare Limited | Health & social care | 2022 |
| C&L Commercial Ltd | Real estate | 2018 |
| C&S Family Property Group Ltd | Real estate | 2025 |
| C-Ban Ltd | Agriculture & fishing | 2012 |
| C. & H. (UK) Limited | Financial services | 2014 |
| C. & R. Westbury Limited | Real estate | 1973 |
| C.A.D Road Transport Ltd | Transport & logistics | 2021 |
| C.A.Eze's Properties Limited | Real estate | 2024 |
| C.A.M.S (Anglia) Ltd | Administrative & support | 2025 |
| C.D.E.D. Limited | Real estate | 2020 |
| C.D.N. (Suffolk) Ltd | Transport & logistics | 2016 |
| C.F.G. Emerald Consulting Limited | Financial services | 2022 |
| C.Fenner Ltd | Transport & logistics | 2019 |
| C.I.P Trading Ltd | Wholesale & retail | 2024 |
| C.K. Plumbing Services Limited | Construction | 2007 |
| C.O.S Groundworks Ltd | Construction | 2023 |
| C.P.S (Anglia) Ltd | Administrative & support | 2025 |
| C.V.East Ltd | Other services | 2017 |
| C100P Limited | Financial services | 2024 |
| C2Z Properties Limited | Financial services | 2025 |
| CA LA Mama Acasa Ltd | Hospitality | 2025 |
| CA Partners Ltd | Health & social care | 2022 |
| CAA Electrical Services Limited | Manufacturing | 2017 |
| Cable Concepts Ltd | Construction | 2024 |
| Cabled Solutions Limited Liability Partnership | | 2010 |
| Cabra Property Solutions Ltd | Professional & scientific | 2023 |
| Cadman 2003 Limited | Real estate | 2003 |
| Cadman Flooring Limited | Construction | 2012 |
| Cadman Plant & Equipment Limited | Administrative & support | 1975 |
| Cadman Plant Limited | Construction | 2007 |
| Cadra Marketplace Ltd | Information & communication | 2026 |