| Classic Car Finder Limited | Information & communication | 2009 |
| Cleone's Properties Limited | Real estate | 2025 |
| Cleone's Restaurants Limited | Hospitality | 2010 |
| Cleveleys Foods Limited | Manufacturing | 2004 |
| Cologix Limited | Professional & scientific | 2011 |
| Connect Services (East Anglia) Limited | Other services | 2023 |
| Copyfarm (Blackmore) Limited | Agriculture & fishing | 1979 |
| Corporate Robin Limited | Information & communication | 2011 |
| Coulsons Bridges Ltd | Construction | 2010 |
| Cracked HIP Ltd | Information & communication | 2024 |
| Cratfield Hall Ltd | Agriculture & fishing | 2020 |
| Crazybuttonsvintage Ltd | Wholesale & retail | 2021 |
| Creative Interiors by Design Ltd | Construction | 2013 |
| Creature Clothes Limited | Manufacturing | 1996 |
| CRL Home Improvements Ltd | Construction | 2025 |
| Croc & Whale Limited | Wholesale & retail | 2025 |
| Crocusdesigns Limited | Construction | 2008 |
| Cutlers Hill EA Limited | Health & social care | 2010 |
| D B Renovations East Anglia Ltd | Construction | 2014 |
| D C Patrick Newsagents Ltd | Wholesale & retail | 2003 |
| D G Hadingham & SON Limited | Agriculture & fishing | 2016 |
| D L Property Services Limited | Real estate | 2003 |
| D M Pipe Ltd | Construction | 2025 |
| D R Fosdike Limited | Transport & logistics | 2003 |
| D-Agri-S Limited | Agriculture & fishing | 2010 |
| D. R. P. (Builders) Limited | Construction | 1968 |
| D.M.Cargill(Farms)Limited | Agriculture & fishing | 1957 |
| Darco UK Ltd | Wholesale & retail | 2012 |
| David Eagling Engineering Ltd | Professional & scientific | 2013 |
| David Rowe Building Services Ltd | Construction | 2003 |
| David Sayer Consulting Ltd | Professional & scientific | 2014 |
| Deal Farm Holding Co Ltd | Financial services | 2017 |
| Default Position Ltd | Arts & recreation | 2012 |
| Dennis Barber Ltd. | Information & communication | 2002 |
| Design Studio 31 Ltd | Professional & scientific | 2016 |
| Deskagent Ltd | Information & communication | 2025 |
| Discovernatural Ltd | Wholesale & retail | 2023 |
| DMR Electrical (Norfolk & Suffolk) Limited | Construction | 2003 |
| Dog First AID Training Limited | Education | 2019 |
| Donovan Films Limited | Information & communication | 2021 |
| Doune Healthcare Limited | Extraterritorial | 2009 |
| Dowson (Geldeston) Limited | Real estate | 1964 |
| Drakesallows Ltd | Real estate | 2025 |
| Dtek Holding Co Ltd | Financial services | 2018 |
| DTH Designs Limited | Wholesale & retail | 2001 |
| Duchess Launderettes (Halesworth) Limited | Other services | 1971 |
| Duchies Ltd | Hospitality | 2020 |
| Dynamic Studio Limited | Extraterritorial | 2021 |
| E & E Hurren Builders Limited | Construction | 2003 |
| E O Brien Technical Services Limited | Professional & scientific | 2010 |
| Earlham Base Limited | Extraterritorial | 2015 |
| Earsham Sheds Limited | Manufacturing | 2024 |
| East Anglia Competitions Ltd | Wholesale & retail | 2020 |
| East Anglian Psychology Service Limited | Health & social care | 2013 |
| East Anglian Road Markings Limited | Construction | 2013 |
| East Coast Linen Hire Limited | Administrative & support | 2024 |
| East Suffolk GUN Club Limited | Arts & recreation | 2009 |
| East Suffolk Hydraulic Hoses Limited | Manufacturing | 2014 |
| Easternmost Holidays Limited | Hospitality | 2023 |
| Easton Bavents Limited | Real estate | 1943 |
| Easton Spa Limited | Other services | 2025 |
| Ecocert Electrical Services Limited | Construction | 2018 |
| Ecotherapy East CIC | Education | 2021 |
| Ecxxlnt Ltd | Information & communication | 2026 |
| Edwards Farming & Leisure Ltd | Agriculture & fishing | 2018 |
| ELC Vocational Assessment & Safety Solutions Limited | Administrative & support | 2017 |
| Elite Designs Global Ltd | Wholesale & retail | 2023 |
| Ellie’S Boutique Ltd | Wholesale & retail | 2026 |
| ELM Farm Limited | Construction | 2014 |
| Elvira Builds Ltd | Real estate | 2026 |
| Elvira J Limited | Real estate | 2022 |
| Enviaudits Limited | Professional & scientific | 2004 |
| Envirodel Ltd | Manufacturing | 2024 |
| Epicwebs Limited Liability Partnership | | 2023 |
| EPS Transfers Ltd. | Extraterritorial | 2001 |
| Equalis Consultants Limited | Professional & scientific | 2021 |
| Equalis LLP | | 2020 |
| Essential Electrical Supplies Ltd | Wholesale & retail | 2018 |
| Ethylene Management Company Limited | Manufacturing | 2015 |
| European Book Marketing Limited | Administrative & support | 2009 |
| Evolve.Studioss Ltd | Other services | 2026 |
| Exquisite Global Designs & Restorations UK Ltd | Manufacturing | 2025 |
| Fairhead Builders Limited | Construction | 2003 |
| Fanatic PR Limited | Professional & scientific | 2023 |
| Farm & Rural Management Services Limited | Professional & scientific | 1999 |
| Feathermead Associates Limited | Professional & scientific | 2004 |
| FEN Farm Dairy Limited | Agriculture & fishing | 2014 |
| Fenestration Commercial Ltd | Administrative & support | 2009 |
| Fennel Surveyors Limited | Real estate | 2015 |
| Festival Bars Limited | Hospitality | 2020 |
| Filo and Twine Limited | Manufacturing | 2019 |
| Finvesta Global Ltd | Wholesale & retail | 2017 |
| Fire and Feast Suffolk Ltd | Hospitality | 2021 |
| Firewood 2 U Limited | Agriculture & fishing | 2018 |
| Firmly Rooted Grounds and Gardens Limited | Administrative & support | 2026 |
| First Call Heating Solutions Ltd | Construction | 2023 |
| Fish KIT Limited | Wholesale & retail | 2003 |
| FIT2VAPE Ltd | Wholesale & retail | 2017 |
| Fizz Software Ltd | Information & communication | 2003 |
| Fjeld Consulting Limited | Professional & scientific | 2016 |