| Ecclesall Developments Ltd | Construction | 2008 |
| Ecclesall Heights Limited | Real estate | 2023 |
| Ecclesall Heights RTM Company Ltd | Households | 2025 |
| Ecclesall Lettings Limited | Real estate | 2020 |
| Ecclesall Lighting and Electrical Supplies Ltd | Wholesale & retail | 2023 |
| Ecclesall Medical Limited | Health & social care | 2019 |
| Ecclesall Motor Company Limited | Wholesale & retail | 2002 |
| Ecclesall Print Ltd | Manufacturing | 2011 |
| Ecclesall Print Property Limited | Real estate | 2023 |
| Ecclesall Road Clinic Ltd | Wholesale & retail | 2026 |
| Ecclesall Roofing (Sheffield) Limited | Construction | 2022 |
| Ecclesall Roofing and General Building Contractors Limited | Construction | 2013 |
| Ecclesall Sushi Ltd | Hospitality | 2021 |
| Ecclesall Wealth Management Limited | Financial services | 2009 |
| Ecclesbridge Limited | Real estate | 2016 |
| Ecclesfield Car and Commercial Ltd | Wholesale & retail | 2011 |
| Ecclesfield Charcoal Grill Limited | Hospitality | 2025 |
| Ecclesfield Chinese Takeaway Ltd | Hospitality | 2017 |
| Ecclesfield Engineering Limited | Professional & scientific | 1994 |
| Ecclesfield Garage Ltd | Wholesale & retail | 2009 |
| Ecclesfield in Bloom Ltd | Real estate | 2013 |
| Ecclesfield Pizza Ltd | Hospitality | 2022 |
| Ecclesfield Spartans Junior Football Club Ltd | Hospitality | 2022 |
| Ecclesfield Sports and Social Ltd | Real estate | 2016 |
| Ecco TAP Bar & Bistro Ltd | Hospitality | 2023 |
| Eccy Barber Ltd | Other services | 2024 |
| Eccy PUB Co Ltd | Hospitality | 2025 |
| ECE Signature Detailing Ltd | Wholesale & retail | 2026 |
| ECH Cars Ltd | Administrative & support | 2024 |
| Echelon Network Ltd | Information & communication | 2025 |
| Echelon Prime Ltd | Information & communication | 2026 |
| Echelons Network Ltd | Information & communication | 2026 |
| Echo (Woodseats Road) Management Company Limited | Households | 2006 |
| Echo Chamber Music Limited | Administrative & support | 2023 |
| Echo EMS Group Ltd | Financial services | 2026 |
| Echo Fire and Medical Limited | Other services | 2016 |
| Echo Fleet Services Limited | Wholesale & retail | 2018 |
| Echo Inns Limited | Hospitality | 2014 |
| Echo KOI Trade Limited | Wholesale & retail | 2025 |
| Echo Miraitowa Limited | Wholesale & retail | 2025 |
| Echo X Echo Limited | Administrative & support | 2022 |
| Echocrystal Studios Limited | Information & communication | 2025 |
| Echolite Electrics Limited | Energy | 2010 |
| Echosystems AI Ltd | Information & communication | 2025 |
| Echoview Hydroacoustics UK Ltd | Information & communication | 2022 |
| ECK Mini Market Limited | Wholesale & retail | 2025 |
| Eckington Carwash Ltd | Other services | 2025 |
| Eckington Development Company | Real estate | 2001 |
| Eckington Hall Flats Limited | Households | 1999 |
| Eckington Miners Welfare Social Club Limited | Administrative & support | 1992 |
| Eckington Pizza Ltd | Hospitality | 2022 |
| Eckington Properties Limited | Real estate | 1991 |
| Eckington Scaffolding Ltd | Construction | 2026 |
| Eckington Self Storage Limited | Transport & logistics | 2018 |
| Eckngton Cars Limited | Wholesale & retail | 2025 |
| ECL Coaching Ltd | Professional & scientific | 2026 |
| Eclinical Consulting Ltd | Professional & scientific | 2011 |
| Eclipse Care Solutions Ltd | Health & social care | 2019 |
| Eclipse Magnetics Limited | Manufacturing | 1954 |
| Eclipse Manufacturing Solutions Ltd | Manufacturing | 2017 |
| Eclipse Painters & Decorators Limited | Construction | 2023 |
| Eclipse Theatre Company Ltd | Arts & recreation | 2010 |
| Eclipse Tools Limited | Extraterritorial | 1997 |
| Ecloud Mexborough Limited | Wholesale & retail | 2019 |
| Eco Aura Car Hire Ltd | Administrative & support | 2025 |
| Eco Aura Construction Ltd | Construction | 2025 |
| Eco Aura Import & Export Ltd | Wholesale & retail | 2025 |
| Eco Aura Skip Hire Ltd | Water & waste | 2025 |
| Eco Compliance and Solutions Limited | Administrative & support | 2024 |
| Eco Creative Consultancy Limited | Professional & scientific | 2024 |
| Eco Energy Smart Limited | Extraterritorial | 2016 |
| Eco Essentials 27 Ltd | Wholesale & retail | 2024 |
| Eco Furniture County Ltd | Wholesale & retail | 2020 |
| Eco Happy Installs Limited | Construction | 2025 |
| Eco Happy Limited | Construction | 2025 |
| Eco Happy Solar Ltd | Construction | 2026 |
| Eco Houses Limited | Construction | 2017 |
| Eco Infinity X Ltd | Manufacturing | 2023 |
| Eco Network Group Limited | Other services | 2023 |
| Eco Prime UK Ltd | Wholesale & retail | 2026 |
| Eco Render Development Ltd | Construction | 2025 |
| Eco Restoration Limited | Construction | 2014 |
| Eco Shuttle Limited | Transport & logistics | 2020 |
| Eco Storage Ltd | Administrative & support | 2010 |
| Eco Technicians Ltd | Construction | 2025 |
| Eco Waste & Metal Solutions Limited | Wholesale & retail | 2025 |
| Eco-Electro Ltd | Professional & scientific | 2020 |
| Eco-Fx Limited | Wholesale & retail | 2011 |
| Eco-Power Renewable Energy Ltd | Construction | 2021 |
| Eco-Tees Ltd | Wholesale & retail | 2025 |
| Eco-Therm Renewable Energy Ltd | Extraterritorial | 2011 |
| ECO4 Every Home Ltd | Administrative & support | 2024 |
| ECO4EVERYONE Ltd | Administrative & support | 2024 |
| Ecoearth Products Limited | Wholesale & retail | 2021 |
| Ecogreen Recycling Solutions Ltd | Water & waste | 2026 |
| Ecohaven Property Solutions Ltd | Real estate | 2026 |
| Ecohome Engineering Ltd | Construction | 2015 |
| Ecohouseuk Ltd | Construction | 2024 |
| Ecological Design Associates Limited | Administrative & support | 2022 |
| Ecological Land Maintenance C.I.C. | Administrative & support | 2026 |