| CRM Plasterers Limited | Construction | 2022 |
| Crmr Services Ltd | Professional & scientific | 2021 |
| Crop Shop 2020 Ltd | Other services | 2020 |
| Cross Media Print and Digital Solutions Limited | Manufacturing | 2017 |
| Crossley Farms Limited | Agriculture & fishing | 1981 |
| Crossways Investigations Ltd | Administrative & support | 2021 |
| Crown Campers Limited | Manufacturing | 2020 |
| Crown Street Hall Management Company Limited | Households | 2019 |
| Crystal Waters Limited | Wholesale & retail | 2000 |
| Crystal Waters Smokery Ltd | Hospitality | 2012 |
| CSC Asset Management Limited | Real estate | 2024 |
| CSD Financial Limited | Professional & scientific | 2023 |
| CSK Fabrication Limited | Construction | 2023 |
| CTS Plastering and Rendering Ltd | Construction | 2024 |
| Cue-Plas Limited | Manufacturing | 1981 |
| CUPCAKES2GO Limited | Construction | 2011 |
| Curtis FOX Limited | Administrative & support | 2025 |
| Curtis Properties (EA) Limited | Real estate | 2021 |
| Cwam UK Limited | Professional & scientific | 2021 |
| Cybertrax Internet Services Limited | Professional & scientific | 2020 |
| Cyclerecycleuk Limited | Wholesale & retail | 2021 |
| D & D Builders (East Anglia) Limited | Construction | 2018 |
| D & J Metals Limited | Manufacturing | 2008 |
| D & R Rentals Ltd | Real estate | 2025 |
| D a Davies Offshore Limited | Mining & quarrying | 2024 |
| D a Piping Solutions Limited | Construction | 2015 |
| D and N Property Rentals Ltd | Real estate | 2024 |
| D Davies Limited | Mining & quarrying | 2022 |
| D J Electrical East Anglia Limited | Construction | 2018 |
| D J Howe Limited | Professional & scientific | 2017 |
| D J Marketing 1986 Limited | Other services | 2020 |
| D Jackson Construction Ltd | Mining & quarrying | 2025 |
| D Marcelli Contracting Limited | Transport & logistics | 2014 |
| D P Squire Limited | Mining & quarrying | 2025 |
| D Palmer Engineering Limited | Professional & scientific | 2018 |
| D R Design Engineering Limited | Professional & scientific | 2018 |
| D S Moore Building & Groundworks Limited | Construction | 2022 |
| D W Online Limited | Information & communication | 2007 |
| D&C Advisory Ltd. | Professional & scientific | 2023 |
| D&C Budget Baits & Tackle Ltd | Wholesale & retail | 2024 |
| D&J Leggett Distributions Ltd | Wholesale & retail | 2025 |
| D&K Storage Ltd | Real estate | 2026 |
| D&S Holdings Lowestoft Ltd | Real estate | 2024 |
| D-Nas Community CIC | Wholesale & retail | 2024 |
| D.E.N.T.S. (EA) Ltd | Wholesale & retail | 2006 |
| D.J. Trower Limited | Construction | 1982 |
| D.J.H. Transport (UK) Limited | Transport & logistics | 2010 |
| D.J.S Services Limited | Professional & scientific | 2019 |
| DA Distributions Ltd | Wholesale & retail | 2025 |
| Daico (EA) Limited | Construction | 2025 |
| Daines Properties Limited | Real estate | 2016 |
| Dakin Ltd | Construction | 2023 |
| Dame Properties Limited | Households | 2023 |
| Damotec Ltd | Mining & quarrying | 2003 |
| Damp(Uk) Ltd | Construction | 2015 |
| DAN Wilson Design Limited | Professional & scientific | 2022 |
| Dancys London Limited | Manufacturing | 2012 |
| Dangerfield Plumbing & Heating Ltd | Construction | 2022 |
| Daniel Jessup Brickwork Limited | Construction | 2026 |
| Dantech Energy Limited | Mining & quarrying | 2013 |
| Darcy Power Services Limited | Construction | 2017 |
| Darren Self Limited | Manufacturing | 2023 |
| Datatim Limited | Administrative & support | 1996 |
| Davenport Global Consulting Limited | Professional & scientific | 2008 |
| David Jermy Limited | Agriculture & fishing | 1976 |
| David Warnes & Co.Limited | Agriculture & fishing | 1964 |
| Daxie & Dally Dog Grooming Ltd | Other services | 2024 |
| Day & Knight Property Limited | Real estate | 2020 |
| Dayal Ltd | Hospitality | 2018 |
| DAZ & LJ Trading Ltd | Wholesale & retail | 2026 |
| Dazzax Limited | Administrative & support | 2020 |
| DB Signs Limited | Professional & scientific | 2012 |
| DBP Property Group Ltd | Real estate | 2024 |
| DC Ironworks Limited | Wholesale & retail | 2017 |
| Dclb Ship Pakefield Limited | Hospitality | 2023 |
| DD Studio Ltd. | Information & communication | 2015 |
| DD12 Contract Security Services Ltd | Administrative & support | 2018 |
| Ddkn Limited | Wholesale & retail | 2023 |
| Deakins Developments Limited | Construction | 2019 |
| Deans Beans Coffee HUT Ltd | Hospitality | 2023 |
| Deans Beans Pitstop Cafe Ltd | Hospitality | 2023 |
| Deas Group Limited | Professional & scientific | 2019 |
| Deathtrash Pictures Ltd | Arts & recreation | 2022 |
| Debsea Properties Limited | Households | 2015 |
| Deepblue Renewables Limited | Professional & scientific | 2025 |
| Deliver Fish Limited | Wholesale & retail | 2021 |
| Delpro Wind Ltd | Manufacturing | 2014 |
| Deluxe Installations Ltd | Construction | 2020 |
| Demangle Detangle Limited | Other services | 2017 |
| Denash Engineering Ltd | Professional & scientific | 2022 |
| Deneside Limited | | 1972 |
| Deniros Limited | Hospitality | 2025 |
| Depd Limited | Construction | 2021 |
| Derek Austin Heating Limited | Construction | 1978 |
| Designplan Limited | Professional & scientific | 1984 |
| Desire Path Creative Limited | Information & communication | 2014 |
| Detainee Supplies Ltd | Wholesale & retail | 2013 |
| Dewright Ltd | Real estate | 2019 |
| DGB Developments Limited | Professional & scientific | 2009 |
| Dgems Ltd | Real estate | 2020 |