| Staycations Maldon Ltd | Hospitality | 1994 |
| Steele Rose Funeral Services Limited | Other services | 2015 |
| Steele Rose Legal Services Ltd | Professional & scientific | 2024 |
| Steele Rose Property Services Limited | Professional & scientific | 2020 |
| Steele Rose Storage Limited | Administrative & support | 2012 |
| Stepup Signalling Consulting Limited | Professional & scientific | 2007 |
| Sterey Design Limited | Construction | 2001 |
| Steven (Holdings) Limited | Construction | 1960 |
| Stour Valley Property Ltd | Construction | 2021 |
| Stranger Nails & Beauty Ltd | Other services | 2023 |
| Stratton Oakmont Consulting Ltd | Professional & scientific | 2014 |
| Streamline Services Limited | Professional & scientific | 2026 |
| STT Medicare Limited | Health & social care | 2013 |
| Stuart Devonish Decorators Limited | Construction | 2022 |
| Studio 95 Essex Ltd | Arts & recreation | 2026 |
| Studio Interior Limited | Professional & scientific | 2018 |
| Studio Verdant Landscape and Garden Design Ltd | Administrative & support | 2026 |
| Style Essential Limited | Wholesale & retail | 1997 |
| Suffolk Machinery Traders Ltd | Wholesale & retail | 2023 |
| Suffolk OIL (Environmental) Limited | Wholesale & retail | 2016 |
| Suffolk OIL Solutions Limited | Construction | 2013 |
| Sugondha Indian Takeaway Ltd | Hospitality | 2026 |
| Sugondha Ltd | Hospitality | 2017 |
| Summer Stone Ltd | Real estate | 2021 |
| Sunday Skies Ltd | Administrative & support | 2020 |
| Sunnydays Baby and Toddler Group CIC | Health & social care | 2024 |
| Support and Care Solutions Ltd | Health & social care | 2022 |
| Supreme Autocare Ltd | Administrative & support | 2025 |
| SW Quality Management Limited | Professional & scientific | 2002 |
| Swan Court (Sible Hedingham ) Management Company Limited | Households | 1987 |
| Swyng Technology Ltd | Information & communication | 2026 |
| T & H Contracts Limited | Construction | 2017 |
| T C L Ltd | Wholesale & retail | 2000 |
| T Kennedy Limited | Education | 2020 |
| T P Root Carpentry Limited | Construction | 2017 |
| T&N Developments Limited | Construction | 2015 |
| T.A. Dale Fire Limited | Construction | 2005 |
| Tahd Electrical Contractors Limited | Construction | 2017 |
| Tailored Equine Stables Limited | Extraterritorial | 2021 |
| Tailored Fabrications Ltd | Manufacturing | 2020 |
| Talent BEN Limited | Arts & recreation | 2024 |
| Tanveer Ecom Ltd | Wholesale & retail | 2022 |
| Tarbin Plumbing & Heating Limited | Construction | 2011 |
| Taris Sultana Union UK Ltd | Agriculture & fishing | 2021 |
| TD Crane Limited | Construction | 2015 |
| TDM Projects Ltd | Construction | 2018 |
| Tea & Brisket Ltd | Hospitality | 2025 |
| Teachers 4 Teachers Limited | Administrative & support | 2019 |
| Tech Sales Consulting Ltd | Professional & scientific | 2019 |
| Tech Speed Solutions Limited | Information & communication | 2009 |
| Telstar Couriers Limited | Extraterritorial | 2018 |
| Temperance Hall RTM Company Limited | Households | 2010 |
| Tendertots Limited | Wholesale & retail | 2004 |
| Teverson & Wood Properties Ltd | Construction | 2023 |
| Tewlipfairy Creations Limited | Arts & recreation | 2019 |
| THE Arch Clinic and Training Ltd | Other services | 2026 |
| THE Batty Bake Company Limited | Manufacturing | 2011 |
| THE Braintree Sportsman Limited | Arts & recreation | 2010 |
| THE Business Information Bureau Limited | Real estate | 1997 |
| THE Cartlodge Company Limited | Construction | 2012 |
| THE Chigwell Ridings (Management) Company Limited | Households | 1989 |
| THE Clinch Portfolio Ltd | Real estate | 2023 |
| THE Crafting-Emporium Ltd | Wholesale & retail | 2023 |
| THE Crystal Lounge Halstead Limited | Wholesale & retail | 2026 |
| THE Eastern Training Alliance Limited | Education | 2022 |
| THE Eden Rooms Ltd | Other services | 2024 |
| THE Electric Incentive Company Limited | Wholesale & retail | 1994 |
| THE Essex Hall Farm Limited Partnership | | 2013 |
| THE Fantastic Brands Company Ltd | Wholesale & retail | 2024 |
| THE Farm Shop Petersfield Limited | Wholesale & retail | 2024 |
| THE Fleet Safety Systems Group Ltd | Construction | 2018 |
| THE Hedingham Foundation CIC | Health & social care | 2015 |
| THE Hepworth Hall Farming Company Limited | Administrative & support | 1997 |
| THE Holden F5 Steam Locomotive Trust | Manufacturing | 2001 |
| THE Hook of Halstead Limited | Hospitality | 2014 |
| THE Hub Arts Limited | Arts & recreation | 2009 |
| THE Joinery Shop (East Anglia) Limited | Construction | 2004 |
| THE Kings Head Centre (Maldon) Limited | Wholesale & retail | 1979 |
| THE League of Friends of Halstead Hospital Limited | Health & social care | 2006 |
| THE Leigh Studio Limited | Professional & scientific | 2018 |
| THE Little Garage Essex Ltd | Wholesale & retail | 2018 |
| THE Mental Health Project Limited | Education | 2023 |
| THE Mentor Academy Limited | Education | 2022 |
| THE Moon and Mars Limited | Wholesale & retail | 2013 |
| THE Music Company (UK) Ltd | Administrative & support | 2005 |
| THE Oak Rooms Limited | Hospitality | 2019 |
| THE Old Court House (Halstead) Management Company Limited | Households | 2018 |
| THE Old Moot House Ltd | Hospitality | 2026 |
| THE Original Sandpit Company Ltd | Manufacturing | 2017 |
| THE Ostler Ltd | Arts & recreation | 2012 |
| THE Park Preschool (Halstead) Limited | Education | 2011 |
| THE Quarry Battery Company Limited | Professional & scientific | 2010 |
| THE Rustic Dish Ltd | Wholesale & retail | 2013 |
| THE Smith House Consultancy Ltd | Professional & scientific | 2025 |
| THE Smith House Ltd | Professional & scientific | 2018 |
| THE Starr Inn Limited | Real estate | 2012 |
| THE Strand at Pebmarsh Ltd | Real estate | 2023 |
| THE Swallow Court Residents Association Limited | Households | 1996 |
| THE Trade Inn Witham Partnership LP | | 2013 |
| THE White Nettle Ltd | Manufacturing | 2019 |