| W.E.C. Lines UK Limited | Transport & logistics | 2019 |
| W.L. Agencies Limited | Transport & logistics | 1967 |
| Waffleshackfelixstowe Limited | Hospitality | 2022 |
| Walking on Art Ltd | Construction | 2015 |
| Walton Estates Limited | Extraterritorial | 1979 |
| Walton Takeaway Ltd | Hospitality | 2020 |
| Walton Transport & Logistics Ltd | Transport & logistics | 2023 |
| Wands Crystal Emporium Ltd | Wholesale & retail | 2023 |
| Warberts Trading Ltd | Administrative & support | 2017 |
| Waves Hair Ltd | Other services | 2018 |
| Wellington Pier Limited | Financial services | 2026 |
| Westbank Transport Services Limited | Transport & logistics | 2012 |
| Westbound Transport Ltd | Transport & logistics | 2026 |
| Wheelers D T & T Ltd | Transport & logistics | 2021 |
| White Horse (Felixstowe) Limited | Hospitality | 2024 |
| White Lion Trans Ltd | Transport & logistics | 2022 |
| Whiteworld Holdings Ltd | Financial services | 2017 |
| Whitley Consulting Limited | Professional & scientific | 2024 |
| Wigwam Grouping Limited | Professional & scientific | 2011 |
| Wilden Capital Ltd | Professional & scientific | 2026 |
| Williams - Wroe Limited | Professional & scientific | 2003 |
| Wilson Global Logistics Limited | Transport & logistics | 2016 |
| Wilson-Fox Ltd | Financial services | 2023 |
| Winkles at the Ferry Ltd | Hospitality | 2013 |
| Wise Washing Ltd | Administrative & support | 2022 |
| WIZ Transport Ltd | Transport & logistics | 2016 |
| WKM Holdings Ltd | Real estate | 2022 |
| WKM Property Investments LLP | | 2026 |
| Wolfgang and Rudolf Limited | Financial services | 2023 |
| Wright Property Solutions (EA) Ltd | Real estate | 2025 |
| Wyburn Investment Company Limited | Real estate | 1955 |
| Wyford Flat Management Limited | Real estate | 1996 |
| Wyro Limited | Transport & logistics | 2018 |
| Xanetics Limited | Information & communication | 1999 |
| Xtra Time Sports Development Limited | Administrative & support | 2017 |
| Yachts for Sale and Charter Limited | Transport & logistics | 2020 |
| Yazzy Ltd | Hospitality | 2025 |
| Yellowhammer Investments Limited | Transport & logistics | 2001 |
| YEO Group Holdings Limited | Financial services | 2026 |
| YEO Group Limited | Hospitality | 2000 |
| Young Engineers Suffolk Ltd | Education | 2024 |
| Zawdi Ltd | Transport & logistics | 2022 |
| Zenvirox Ltd | Wholesale & retail | 2025 |
| Zhou Food Limited | Hospitality | 2025 |
| Zibster Ltd | Transport & logistics | 2026 |
| Zizo Services Ltd | Other services | 2019 |
| ZJ Trans Ltd | Transport & logistics | 2011 |
| ZOLTAN74 Limited | Extraterritorial | 2018 |
| Zozo Transport Ltd | Transport & logistics | 2024 |
| Zucabala Ltd | Transport & logistics | 2022 |
| Zygo Ltd | Transport & logistics | 1999 |
| Zypher Holdings Limited | Real estate | 2023 |