| Quantrend Ltd | Administrative & support | 2016 |
| R C Gower CSI & T Limited | Mining & quarrying | 2012 |
| R&V Electrical Ltd | Construction | 2013 |
| R98 Group Limited | Construction | 2018 |
| RAF Flooring Ltd | Construction | 2026 |
| RDR Plastering Ltd | Construction | 2022 |
| Reculver Limited | Real estate | 1994 |
| Reed Gillmore Limited | Administrative & support | 2021 |
| Reminiscing Limited | Wholesale & retail | 2002 |
| Reva Holdings Limited | Hospitality | 2019 |
| REX Mews Management Company Limited | Households | 2017 |
| Richillustrations Limited | Arts & recreation | 2024 |
| Rilox Enterprises Limited | Hospitality | 2015 |
| RMK Cubed Business Intelligence Limited | Professional & scientific | 2017 |
| Roselifunk Ventures Limited | Wholesale & retail | 2026 |
| Ross & Wheatley Ltd | Hospitality | 2016 |
| Rotation Collective Ltd | Education | 2024 |
| Royalist Campaign Ltd | Other services | 2019 |
| RTT Consulting Ltd | Construction | 2025 |
| RX15 RAF Ltd | Professional & scientific | 2025 |
| S & L PUB Company Ltd | Hospitality | 2010 |
| S J Herrington Ltd. | Construction | 1999 |
| S.J.M World Corporation Ltd | Professional & scientific | 2012 |
| Safa Estates Ltd | Real estate | 2019 |
| Safari Childcare Colchester Limited | Education | 2017 |
| Sander Sands Ltd | Real estate | 2026 |
| Sanghera Services Ltd | Real estate | 2021 |
| Satgo Ltd | Professional & scientific | 2005 |
| SDL PKB Ltd | Construction | 2018 |
| Seaside Supplies Limited | Wholesale & retail | 2009 |
| Secretarial & Management (Frinton on Sea) Limited | Administrative & support | 2012 |
| Servefast Ltd | Administrative & support | 2016 |
| Servers Group Ltd | Administrative & support | 2023 |
| Shake Patty & Roll Limited | Hospitality | 2016 |
| Sharpe Property Management Ltd | Real estate | 2012 |
| Shelby Investments Ltd | Real estate | 2015 |
| Silked by MJ Ltd | Other services | 2025 |
| Silverton Aggregates Limited | Transport & logistics | 2017 |
| Silverton Building Supplies Limited | Extraterritorial | 2017 |
| Silverwood Property Group Ltd | Construction | 2026 |
| Simmonds Builders Ltd | Wholesale & retail | 2025 |
| SIX Moments Limited | Information & communication | 2019 |
| SJM Group Ltd | Professional & scientific | 2016 |
| Smart Pool Systems Ltd | Administrative & support | 2020 |
| Smarta GAS Ltd | Construction | 2021 |
| Smiths Financial Solutions Ltd | Financial services | 2020 |
| Smiths Newsagents Limited | Wholesale & retail | 2002 |
| Sober Curious Coastal Community Interest Company | Health & social care | 2025 |
| Something Vivid Limited | Manufacturing | 1997 |
| Spacefarer Games Ltd. | Information & communication | 2022 |
| Sparkle Ladies Gym Ltd | Arts & recreation | 2024 |
| Spartans Heating & Plumbing Solutions Ltd | Professional & scientific | 2021 |
| Spendvest Limited | Financial services | 2025 |
| Spice Corner Ltd | Hospitality | 2019 |
| Spitfire Aerial Media Ltd | Professional & scientific | 2026 |
| Spml Mofl Ltd | Construction | 2019 |
| Star of India Ltd | Hospitality | 2025 |
| Steadii Ltd | Wholesale & retail | 2024 |
| Stoner Ross Ltd | Hospitality | 2015 |
| Strafford Gate Limited | Professional & scientific | 2003 |
| Sturnwood Recruitment Limited | Administrative & support | 2008 |
| Switch IT Global Limited | Information & communication | 2017 |
| Sxdronesurveys Ltd | Professional & scientific | 2022 |
| Talent Tank Ltd | Arts & recreation | 2018 |
| Tendring Mobility Centre Limited | Wholesale & retail | 2007 |
| Tethys OIL and Mining Ltd | Professional & scientific | 2011 |
| THE Bloom Childcare Group Limited | Health & social care | 2024 |
| THE Bloom Play Cafe Limited | Hospitality | 2026 |
| THE Corner Lounge Ltd | Hospitality | 2024 |
| THE Duck (Campsea ASH) Limited | Hospitality | 2019 |
| THE Foot Health College Limited | Health & social care | 2024 |
| THE Happiness Emporium Ltd | Manufacturing | 2025 |
| THE Hungry Bedouin Deli Limited | Wholesale & retail | 2022 |
| THE Joy of Babies Ltd | Other services | 2023 |
| THE Maplins (Freehold) Limited | Households | 2008 |
| THE Museum of Philately CIC | Arts & recreation | 2025 |
| THE Olde Sweet Shop Limited | Wholesale & retail | 2016 |
| THE Pointer Inn Limited | Hospitality | 2026 |
| THE Stoic Pheonix Ltd | Information & communication | 2026 |
| THE Topaz Trust Limited | Other services | 2005 |
| Thorne Printing & Publishing Co.Limited | Real estate | 1958 |
| TIM Hames Ltd | Professional & scientific | 2023 |
| Titan Partners Ltd | Professional & scientific | 2023 |
| TLD Construction Ltd | Construction | 2015 |
| Todo Barbers Ltd | Other services | 2021 |
| Top Tier Construction Limited | Construction | 2024 |
| Total Services Management (TSM) Ltd | Mining & quarrying | 2020 |
| Town House (ELY) Limited | Hospitality | 2000 |
| Tree Planning Solutions Ltd | Agriculture & fishing | 2023 |
| Treestrong Limited | Real estate | 1989 |
| Trevor Blake Properties Ltd | Real estate | 2025 |
| True Twin Limited | Administrative & support | 2025 |
| Ubuntu Academy Coaching Training CIC | Public administration | 2023 |
| UNA MAS Cerveza Ltd | Hospitality | 2026 |
| Vacuum Excavation Service & Repair Limited | Manufacturing | 2024 |
| Varie Limited | Manufacturing | 2025 |
| Village Fires Installations Ltd | Construction | 2025 |
| Vitelaru Ltd | Information & communication | 2023 |
| Vivid Hair Extensions Ltd | Wholesale & retail | 2026 |
| W J M Limited | Administrative & support | 2011 |