| Woody and Frank Limited | Professional & scientific | 2018 |
| Workwear Village Limited | Manufacturing | 2022 |
| World Schools Festival Ltd | Arts & recreation | 2023 |
| World Wide Spiritual Healing Ltd | Health & social care | 2024 |
| Worldlife Centres Limited | Professional & scientific | 1991 |
| Worldwide Event Promotions Ltd | Professional & scientific | 2012 |
| Worldwide Freight Solutions Ltd | Transport & logistics | 2024 |
| Worldwide Logistic Solutions Ltd | Transport & logistics | 2009 |
| Worthing Gymnastics Academy Ltd | Arts & recreation | 2018 |
| Worthing Gymnastics Club Ltd | Arts & recreation | 2024 |
| WP Sporthorses Ltd | Agriculture & fishing | 2020 |
| Wren Consultants Limited | Professional & scientific | 2024 |
| Wren Winter Ltd | Professional & scientific | 2025 |
| Wright Kuruvilla Architects Ltd | Professional & scientific | 2024 |
| Writing Agency Ltd | Professional & scientific | 2015 |
| WW Fencing Limited | Administrative & support | 2022 |
| WW Media Group Limited | Information & communication | 2024 |
| Wyatt & SON Estate Agents Limited | Extraterritorial | 1992 |
| Wyfold Freehold Company Limited | Real estate | 1995 |
| Wylanbriar Limited | Real estate | 2026 |
| Wyvern Place (Warnham) Management Company Limited | Households | 2005 |
| X & X Watches Limited | Wholesale & retail | 2023 |
| Xclusiv Limited | Wholesale & retail | 2003 |
| Xpert Lift Consultants Ltd | Professional & scientific | 2025 |
| XQ Productions Limited | Professional & scientific | 2026 |
| Xyloforms Ltd | Manufacturing | 2018 |
| Yangtze Tiger Ltd | Real estate | 2022 |
| YAO IP Ltd | Administrative & support | 2025 |
| YAO Technology Limited | Professional & scientific | 2025 |
| Yeates Electrical Limited | Construction | 2023 |
| Yellow Walrus Creative Ltd | Professional & scientific | 2019 |
| Yellowstone Living Limited | Real estate | 2026 |
| Yemek Limited | Hospitality | 2025 |
| YEW Trees (Slinfold) Management Company Limited | Households | 2019 |
| Yeyoyaaa & Co Ltd | Manufacturing | 2021 |
| YM Accountancy Limited | Administrative & support | 2012 |
| Ymec Facilities Ltd | Construction | 2018 |
| Ynwa Bidco Limited | Other services | 2022 |
| Ynwa Midco 1 Limited | Other services | 2022 |
| Ynwa Midco 2 Limited | Other services | 2022 |
| Yonder Creative Limited | Professional & scientific | 2024 |
| York Close Estate Management Co. Limited | Administrative & support | 1983 |
| Yorwei Beauty Ltd | Manufacturing | 2025 |
| Young Medical Communications and Consulting Limited | Professional & scientific | 2014 |
| Young Property Limited | Real estate | 2021 |
| Your Bookkeeping Matters Ltd | Professional & scientific | 2011 |
| Your Champions Ltd | Administrative & support | 2020 |
| Your Data Consultant Ltd | Administrative & support | 2023 |
| Your Event Specialists Ltd | Arts & recreation | 2021 |
| Your Listening Space Ltd | Professional & scientific | 2023 |
| Your Treasury Limited | Information & communication | 2024 |
| YU Homes Limited | Real estate | 2022 |
| Yusuf Food Catering Ltd | Hospitality | 2025 |
| Z Fitzgerald Limited | Hospitality | 2020 |
| Zachri Cleaning Services Limited | Administrative & support | 2016 |
| Zade Home Ltd | Professional & scientific | 2009 |
| Zaman Catering Ltd | Hospitality | 2025 |
| Zane Zviedre Ltd | Manufacturing | 2021 |
| Zanoo Vehicles Ltd | Administrative & support | 2023 |
| ZED Travel Co Ltd | Manufacturing | 2025 |
| Zenith Health Ltd | Health & social care | 2003 |
| Zenith Roofing & Repairs Ltd | Construction | 2022 |
| Zerotwozero Communications Limited | Professional & scientific | 2003 |
| Zetter Blunt Design Limited | Professional & scientific | 2016 |
| ZOE Elizabeth Home Services Ltd | Other services | 2025 |
| Zonta Investments Limited | Health & social care | 2013 |
| Zoperty Ltd | Professional & scientific | 2025 |
| Zorema Ltd | Extraterritorial | 2005 |