| White FOX Holdings Limited | Real estate | 2016 |
| White Stripes Aviation Limited | Manufacturing | 2024 |
| Whiterock Bay Properties Ltd | Real estate | 2013 |
| Whitespots Consulting Limited | Professional & scientific | 2020 |
| Whitewood Holdings Limited | Real estate | 2023 |
| Wild Heart Coffee Roasters Ltd | Wholesale & retail | 2019 |
| William Willis & Co Limited | Real estate | 1967 |
| Williams Homes (Bangor) Ltd. | Construction | 2016 |
| Williams Homes (Donaghadee) Ltd. | Real estate | 2016 |
| Williams Homes (Newtownards) Ltd | Construction | 2021 |
| Williams Homes Limited | Construction | 2015 |
| Willow Contracts (N.I.) Limited | Construction | 2015 |
| Willow Meadery and Distillery Ltd | Manufacturing | 2021 |
| Willow Wealth Management Limited | Financial services | 2015 |
| Willowbank Property Trading Limited | Extraterritorial | 2015 |
| Willowbrook Farms | Agriculture & fishing | 2000 |
| Willowbrook Fine Foods Limited | Manufacturing | 2014 |
| Willowbrook Foods Limited | Manufacturing | 2000 |
| Willowbrook Holdco Limited | Financial services | 2023 |
| Wills Gibson Limited | Real estate | 2011 |
| Winbin Trading Limited | Wholesale & retail | 2024 |
| Windkshk Ltd | Wholesale & retail | 2025 |
| Winds Sound Limited | Wholesale & retail | 2024 |
| Windsor Holiday Park Limited | Hospitality | 2002 |
| Winscott Trading Ltd | Wholesale & retail | 2025 |
| Winstony Limited | Wholesale & retail | 2024 |
| Wise OIL Company Ltd | Wholesale & retail | 2015 |
| WKC Properties (N Ireland) Ltd | Construction | 2018 |
| WMR Electrical Carryduff Limited | Manufacturing | 2018 |
| Wohsdom Limited | Wholesale & retail | 2025 |
| Wojndo Limited | Manufacturing | 2024 |
| WOK Time Cuisine Ltd | Hospitality | 2025 |
| Wolfe Events Ltd | Administrative & support | 2026 |
| Womp Womp Ltd | Wholesale & retail | 2020 |
| Wonan Limited | Wholesale & retail | 2024 |
| Wonderland Cakes Ltd | Manufacturing | 2025 |
| Wondor Limited | Manufacturing | 2024 |
| Wong James Ltd | Wholesale & retail | 2024 |
| Wongdefourwade Limited | Wholesale & retail | 2025 |
| Wongshe Limited | Manufacturing | 2024 |
| Wongting Limited | Wholesale & retail | 2024 |
| Wood Burn Logs Ltd | Agriculture & fishing | 2025 |
| Woodcote Agencies Limited | Wholesale & retail | 2013 |
| Working Tails Limited | Wholesale & retail | 2025 |
| Workmate Pro Ltd | Information & communication | 2025 |
| World Furniture (N.I.) Limited | Wholesale & retail | 2001 |
| World of Vans Ltd. | Wholesale & retail | 2012 |
| Worldwide Finance Ltd | Administrative & support | 2017 |
| Worthington Chiropractic Limited | Administrative & support | 2016 |
| WPB Housing Co Ltd | Construction | 2025 |
| Wpgrams Ltd | Wholesale & retail | 2025 |
| Wright Contracts (Newtownards) Limited | Extraterritorial | 2011 |
| Wright Recycling Limited | Water & waste | 2010 |
| Wright Waste Management Ltd | Water & waste | 2005 |
| Wrights Sofaland Ltd | Wholesale & retail | 2015 |
| Wrlychha Limited | Wholesale & retail | 2025 |
| Wuminyang Limited | Wholesale & retail | 2023 |
| Wuxue Follow Limited | Wholesale & retail | 2025 |
| Wuxueqiuhygtfd Ltd | Wholesale & retail | 2023 |
| Wylie's Property Developments Ltd | Construction | 2007 |
| X Enterprise Group Limited | Financial services | 2026 |
| X Enterprise Properties Limited | Real estate | 2026 |
| X Enterprise Rentals Limited | Real estate | 2026 |
| Xaionainiuderetail Ltd | Wholesale & retail | 2024 |
| Xena Kirby Ltd | Wholesale & retail | 2025 |
| Xiao Bridge Consulting Limited | Wholesale & retail | 2023 |
| Xiaoheng FLY Limited | Wholesale & retail | 2025 |
| Xiaowannzishudretail Ltd | Wholesale & retail | 2025 |
| Xihong YO Limited | Wholesale & retail | 2025 |
| Xincheng Telen Limited | Wholesale & retail | 2025 |
| Xulai Limited | Manufacturing | 2023 |
| Xulixin Ltd | Wholesale & retail | 2025 |
| Xulizhen Ltd | Wholesale & retail | 2024 |
| Xylem Ltd | Manufacturing | 2018 |
| Yeah FUN Limited | Wholesale & retail | 2024 |
| Yellow Dragon Properties Ltd | Real estate | 2023 |
| Yeshere Taken Limited | Wholesale & retail | 2025 |
| Yiland Limited | Wholesale & retail | 2023 |
| Yitang Limited | Wholesale & retail | 2024 |
| Yixxi Limited | Wholesale & retail | 2025 |
| Yohudos Trading Limited | Wholesale & retail | 2023 |
| Yongshu HUA Limited | Wholesale & retail | 2025 |
| YOU Generate C.I.C. | Professional & scientific | 2018 |
| Young Seek Limited | Wholesale & retail | 2025 |
| Youngdreamdiud Limited | Wholesale & retail | 2023 |
| Yuanbaolong Ltd | Wholesale & retail | 2024 |
| Yugd SOQ Ltd | Wholesale & retail | 2024 |
| Yuqing Icon Limited | Wholesale & retail | 2025 |
| Yusuf Erbova Ltd | Wholesale & retail | 2025 |
| Yuxiang HUA Limited | Wholesale & retail | 2025 |
| Zaid David Ltd | Wholesale & retail | 2025 |
| Zaine Kerr Ltd | Wholesale & retail | 2025 |
| Zebedee Projects Ltd | Professional & scientific | 2022 |
| Zenattack Ltd | Manufacturing | 2025 |
| Zenda Enterprises Ltd | Arts & recreation | 2018 |
| Zenith MAX Ltd | Administrative & support | 2023 |
| Zenith Value Ltd | Wholesale & retail | 2025 |
| Zenlfo Ltd | Manufacturing | 2026 |
| Zephyr Mark Limited | Wholesale & retail | 2025 |
| Zgkdx Ltd | Wholesale & retail | 2025 |