| Eco Burn Ltd | London | 2026 |
| Eco Cascade CIC | Glasgow | 2022 |
| Eco Dustless Blasting Limited | Bargoed | 2018 |
| Eco Enviro Llandysul Limited | Llandysul | 2003 |
| Eco Farm Technology Ltd | Llandysul | 2024 |
| Eco Food Creations Ltd | Shepton Mallet | 2020 |
| Eco Hand System Ltd | Brighton | 2021 |
| Eco Hideaways Ltd | Tunbridge Wells | 2022 |
| Eco Horticulture Products Limited | Nottingham | 2018 |
| Eco Indigo Limited | Dunbar | 2017 |
| Eco Leisure Development Ltd | Mirfield | 2017 |
| Eco Moss Ltd | Torquay | 2018 |
| Eco Native Ltd | Cardiff | 2020 |
| Eco Nature Ltd | Jaywick | 2010 |
| Eco Prospects Limited | Kirkby Stephen | 2022 |
| Eco Seeds Ltd | Strangford | 1997 |
| Eco Sixty Limited | Church Stretton | 2022 |
| Eco Tax Holdings Ltd | Derby | 2021 |
| Eco Tree Care & Conservation Limited | Ware | 2007 |
| Eco Tree Care Ltd | Barnsley | 2018 |
| Eco Tree Company UK Limited | Belper | 2008 |
| Eco Tree Services Ltd | Cranfield | 2021 |
| Eco Wolves Ltd | Walkerburn | 2025 |
| Eco-Bioscience Limited | Hunstanton | 2015 |
| Eco-Feed Rare Breeds Ltd | London | 2023 |
| Eco-Gro Limited | Sevenoaks | 2019 |
| Ecoaid Ltd | London | 2014 |
| Ecoalgaform PVT Ltd | Dunfermline | 2024 |
| Ecoarb Limited | Hockley | 2005 |
| Ecobi Limited | Dunfermline | 2020 |
| Ecobio Fertiliser Ltd | Farnham | 2022 |
| Ecocarbon Limited | Edinburgh | 2021 |
| Ecofarm Ltd | Barnsley | 2018 |
| Ecofell Tree Surgery Ltd | Frodsham | 2018 |
| Ecoforce Pest Management UK Ltd | Uxbridge | 2024 |
| Ecoforests Asset Management UK Ltd. | London | 2024 |
| Ecofriend World Limited | London | 2016 |
| Ecoguard Pest Solutions Ltd | Bury St Edmunds | 2008 |
| Ecohuman Ltd | Haddington | 2018 |
| Ecoinsect Limited | Beaconsfield | 2016 |
| Ecological Farm Product Group Limited | St. Neots | 2017 |
| Ecology & Arts Club Limited | Birmingham | 2014 |
| Ecomarine Ltd | London | 2025 |
| Ecomarine Motors Ltd | London | 2025 |
| Ecometric Ltd | Stamford | 2021 |
| Econeco UK Limited | Kington | 2012 |
| Econochem Limited | Aberdeen | 1986 |
| Economic Forestry Group Ltd | Cardiff | 2023 |
| Economic Forestry Limited | Cardiff | 1996 |
| Economy Tree Care Services Ltd | London | 2020 |
| Ecopest Limited | Dartford | 2021 |
| Ecopia Marine Limited | Reading | 2021 |
| Ecording Enviromental Technologies Ltd | London | 2023 |
| Ecorg Ltd | Milton Keynes | 2025 |
| Ecosmart Farming Ltd | Matlock | 2022 |
| Ecosmart Forestry Ltd | Matlock | 2022 |
| Ecosse Limited | Stanmore | 2003 |
| Ecosylva Consultancy Limited | Polegate | 2016 |
| Ecosyn Limited | London | 2023 |
| Ecosystem Capital Limited | Oxford | 2020 |
| Ecotech Farms Limited | Northwood | 2009 |
| Ecotherapy Farm CIC | Norwich | 2024 |
| Ecourban Ltd | Ringwood | 2010 |
| Ecoversityuk CIC | Lydney | 2022 |
| Ecrop Limited | Sheerness | 2011 |
| Ecru (Eco) Ltd | Derby | 2021 |
| ECS Equestrian Group Limited | Brierley Hill | 2025 |
| ECT Farms Limited | Quenington | 1977 |
| ED Griffiths & Co. Limited | Cardigan | 2005 |
| ED Knight Contracting Limited | Salisbury | 2005 |
| ED Simmons PIC Ltd | Taunton | 2018 |
| Ed's Bees Limited | Glasgow | 2012 |
| Edaphos Limited | Wantage | 2005 |
| Edder Farms Limited | Carlisle | 2021 |
| Edderton Wood Ltd | Inverness | 2013 |
| Eddington House Nursery Limited | Seaview | 2021 |
| Eddisbury Farms Ltd | Chester | 2025 |
| Eddlewood K9’S Ltd | Hamilton | 2024 |
| Eddolls (Manor Farm) Limited | Oxfordshire | 1954 |
| Eden Agri & Equine Ltd | Abergele | 2026 |
| Eden Animal Haven Limited | Bury | 2024 |
| Eden ARB Ltd | Doncaster | 2019 |
| Eden Bank Farms Limited | Penrith | 2007 |
| Eden Bloodstock Limited | Lisburn | 2019 |
| Eden Destiny Driven Flowers Ltd | Birmingham | 2009 |
| Eden East Sussex Ltd | London | 2025 |
| Eden Equine Hampshire Ltd | Alton | 2024 |
| Eden Field Farm (Lydiate) Ltd | Blackburn | 2023 |
| Eden Fishing Limited | Peterhead | 2008 |
| Eden Game Limited | Penrith | 2023 |
| Eden Grange Fishery Ltd | Shildon | 2021 |
| Eden Grows CIC | Edenbridge | 2024 |
| Eden LEA Rail (UK) Limited | Doncaster | 2016 |
| Eden Paradise Limited | Purfleet | 2017 |
| Eden ROC Estates Limited | London | 2020 |
| Eden Soil Ltd | London | 2025 |
| Eden Tree Surgeons Ltd | Glasgow | 2019 |
| Eden Tree Surgery Limited | Worthing | 2023 |
| Eden Treescapes Limited | Penrith | 2010 |
| Eden Valley Prawns Ltd | Cupar | 2023 |