| Tom's Multi-Maintenance Ltd | Construction | 2025 |
| Tooli AI Governance Ltd | Information & communication | 2026 |
| Top Deck Toys Ltd | Wholesale & retail | 2025 |
| Total Refurb Construction Ltd | Construction | 2014 |
| Tower Offices Limited | Real estate | 2022 |
| TR Fire & Security Limited | Administrative & support | 2016 |
| Trans Sahara Group Limited | Construction | 2023 |
| Transformation and Change Consultancy Limited | Information & communication | 2015 |
| Treasured Lily Ltd | Wholesale & retail | 2025 |
| Trinitas Services Limited | Hospitality | 1993 |
| Triple A'S Health Care Ltd | Health & social care | 2021 |
| TSO Education Ltd | Information & communication | 2018 |
| Tunsu Logistics Ltd | Transport & logistics | 2024 |
| Turtle Trans Logistics Ltd | Transport & logistics | 2017 |
| Tushe Ltd | Transport & logistics | 2019 |
| Tykom Limited | Wholesale & retail | 2021 |
| UK Engineering Solutions (Essex) Ltd | Wholesale & retail | 2018 |
| Unenext Multibiz Ltd | Wholesale & retail | 2025 |
| Unity Structures Limited | Professional & scientific | 2016 |
| Universal Darts Ltd | Wholesale & retail | 2025 |
| Universal Fitness (Harwich) Ltd | Arts & recreation | 2016 |
| Unnamed Group | Administrative & support | 2023 |
| VAK Shipping Limited | Transport & logistics | 2022 |
| Vantagepoint Tech Consulting Ltd | Information & communication | 2026 |
| Verde EV Solutions & Electrical Contractors Ltd | Wholesale & retail | 2022 |
| Verdeya Healthcare Limited | Professional & scientific | 2026 |
| Vias Transport Ltd | Transport & logistics | 2025 |
| Vibey Hause Media Ltd | Professional & scientific | 2025 |
| Vicarage Farm Holdings Limited | Real estate | 2015 |
| Vilka Waste Collection Ltd | Water & waste | 2025 |
| Wade Atkins LLP | | 2007 |
| Wallenius SOL UK Limited | Transport & logistics | 1947 |
| Warren Property Services Ltd | Real estate | 2025 |
| Waters View Residential Care Home Ltd | Health & social care | 2019 |
| WE ARE Synthetics Limited | Arts & recreation | 2019 |
| Weaver & Anderson Electrical Contractors Ltd | Construction | 2025 |
| Weeley MOT and Service Centre Ltd | Wholesale & retail | 2026 |
| What Climate Limited | Other services | 2017 |
| Whistles Bakery Limited | Manufacturing | 2025 |
| White Group Holdings Ltd | Financial services | 2023 |
| White Mortgage Advice Limited | Financial services | 2020 |
| Wildwinds Limited | Administrative & support | 2009 |
| William Cullen (Farms) Limited | Agriculture & fishing | 1972 |
| Windworx Ltd | Construction | 2017 |
| Wingin IT Flight Training Ltd | Transport & logistics | 2025 |
| Winterberg Management Ltd | Professional & scientific | 2023 |
| Wise RAM Theatre CIC | Education | 2022 |
| WM Thorby Ltd | Real estate | 2017 |
| World Food AID Limited | Public administration | 2012 |
| WSW Rail Solutions Limited | Construction | 2018 |
| WW Cleaning Services Ltd | Administrative & support | 2010 |
| X3 Football Ltd | Wholesale & retail | 2023 |
| Xpert Contracts Ltd | Water & waste | 2023 |
| Y NOT CUE Care and Sales Limited | Wholesale & retail | 2025 |
| Y NOT Holding Company Limited | Financial services | 2025 |
| Y NOT Poker League Limited | Arts & recreation | 2025 |
| Y NOT Pool and Sports Bar Limited | Arts & recreation | 2025 |
| YAZ & Alive Ltd | Professional & scientific | 2025 |
| Yellow Brick RD Nursery Ltd | Education | 2019 |
| Yodab Management Limited | Administrative & support | 2012 |
| Zain EAT Ltd | Hospitality | 2021 |
| Zauservice Ltd | Hospitality | 2025 |
| Zeynel Limited | Hospitality | 2024 |