| Walsin Property Limited | Real estate | 2015 |
| Walton Quality Solutions Ltd | Professional & scientific | 2015 |
| Wanderdot Ltd | Information & communication | 2026 |
| Wanted.Coffee Limited | Wholesale & retail | 2016 |
| Wantslepn Ltd | Wholesale & retail | 2026 |
| WAP Motors Ltd | Wholesale & retail | 2025 |
| WAREHOUSE15 Group Ltd | Wholesale & retail | 2016 |
| WAREHOUSE15 Gym & Fitness Ltd | Arts & recreation | 2023 |
| WAREHOUSE15 Wellness & Recovery Ltd | Wholesale & retail | 2023 |
| Warmflow Engineering Co.Limited | Manufacturing | 1982 |
| Warmflow Limited | Professional & scientific | 1997 |
| Warmsave Limited | Construction | 2015 |
| Warren Legacy Rentals Ltd | Real estate | 2025 |
| Warren Park Stores Ltd | Wholesale & retail | 2003 |
| Warrior Path Ltd | Arts & recreation | 2025 |
| Waterfront Management Group LLP | | 2017 |
| WBS - Western Management Services Limited | Professional & scientific | 2020 |
| WDL Contracts Ltd | Construction | 2018 |
| WE Buy ANY Vehicles Ltd | Wholesale & retail | 2020 |
| WE Hack Health Ltd | Health & social care | 2023 |
| Webologix Ltd | Professional & scientific | 2017 |
| Webweaver Ltd | Information & communication | 2026 |
| Weekly NI Ltd | Wholesale & retail | 2026 |
| WEF Sprucefield Resources NO.1 Ltd | Real estate | 2013 |
| WEF Sprucefield Resources NO.2 Ltd | Real estate | 2013 |
| WEL Sonfey Limited | Professional & scientific | 2021 |
| Welby Associates Wealth Management Limited | Financial services | 2015 |
| Weldon Investments UK Limited | Real estate | 2025 |
| Wellspring Vineyard Church Banbridge | Other services | 2026 |
| Westbury (N.I.) Limited | Real estate | 2018 |
| Western Financial Group Limited | Professional & scientific | 2020 |
| WGB Fabrications Ltd | Manufacturing | 2012 |
| Whinbrook Ltd | Hospitality | 2008 |
| White Cube Engineering Designers Ltd | Construction | 2023 |
| White Mountain Biking Ltd | Other services | 2013 |
| White Star Coffee Ltd | Wholesale & retail | 2017 |
| Whitemountain Group Ltd | Wholesale & retail | 2016 |
| Whiterock Asset Management Ltd | Real estate | 2026 |
| Whitewolf Strength Limited | Arts & recreation | 2013 |
| Whtrck Blow DRY Bar Limited | Other services | 2010 |
| WHY NOT Limited | Professional & scientific | 2020 |
| Wildexpeds Ltd | Education | 2026 |
| Wildlife Pro-Environment Limited | Professional & scientific | 2020 |
| Williamson Electrical Ltd | Construction | 2003 |
| Willoughby Brokers Ltd | Financial services | 2024 |
| Wilson Business & Accounting Services Ltd | Professional & scientific | 2009 |
| Wilson Construction Services Ltd | Construction | 2016 |
| Wilson Project Services Ltd | Administrative & support | 2022 |
| Wilson Utilities & Plant Hire Limited | Construction | 2015 |
| Windmill Stores (Lisburn) Ltd | Wholesale & retail | 2025 |
| Wisd Trading Limited | Manufacturing | 2024 |
| Wisduoma Ltd | Wholesale & retail | 2026 |
| Wisegold Trading LP | | 2016 |
| WJ Law Residential LLP | | 2019 |
| WJL Estates Ltd | Real estate | 2005 |
| WMS Work Media Support LLP | | 2017 |
| WOK a Licious 888 Ltd | Hospitality | 2022 |
| Wokma Lisburn Ltd | Hospitality | 2025 |
| Wolffsohn Research Ltd | Professional & scientific | 2019 |
| Wonderful Creations Limited | Wholesale & retail | 2016 |
| Wondersol Solutions LP | | 2014 |
| Woodbrook Financial Services Limited | Financial services | 2009 |
| Woodlouse Studios Ltd | Information & communication | 2025 |
| Woodvale Costcutter Limited | Wholesale & retail | 2022 |
| Work With Dyslexia Ltd | Professional & scientific | 2024 |
| Workflow Infinity Limited | Information & communication | 2022 |
| Workflow Technologies Limited | Professional & scientific | 2021 |
| Worldwide Deliveries Transportation Limited | Transport & logistics | 2018 |
| Worldwide Express Freight Services Limited | Transport & logistics | 2018 |
| Worldwide Technical Management LP | | 2021 |
| Wrapsthetic Ltd | Other services | 2025 |
| Wray Engineering (Lisburn) Ltd | Manufacturing | 2022 |
| WRB Training & Consultancy Ltd | Administrative & support | 2017 |
| WRM Holdco Ltd | Financial services | 2022 |
| WSB Holdings Ltd | Real estate | 2024 |
| Xelo Ltd | Professional & scientific | 2025 |
| Xiaqica Ltd | Wholesale & retail | 2024 |
| Xperience Dynamics Limited | Information & communication | 2014 |
| Xperience Group Holdings Limited | Information & communication | 2009 |
| Xperience Group Management Limited | Information & communication | 2016 |
| Xperience IT Solutions Limited | Information & communication | 1970 |
| Xsre Tech Ltd | Information & communication | 2022 |
| Yabadabs Ltd | Wholesale & retail | 2021 |
| Yallaa C.I.C. | Education | 2016 |
| YCC 138 Ltd | Hospitality | 2021 |
| Yeesn Limited | Wholesale & retail | 2024 |
| Yilimunuermm Ltd | Wholesale & retail | 2025 |
| Young Excavator Services Limited | Water & waste | 1997 |
| Younge Ltd | Real estate | 2017 |
| Your Body MAP Ltd | Information & communication | 2017 |
| Your Wellfit Limited | Information & communication | 2025 |
| Yousaf & Company Limited | Health & social care | 2012 |
| YY Group Ltd | Information & communication | 2019 |
| Zac's Music Movement CIC | Education | 2021 |
| Zach Properties Ltd | Extraterritorial | 2015 |
| Zakk's Barber Shop Ltd | Other services | 2025 |
| Zane Group Limited | Construction | 2018 |
| Zarben Group Ltd | Real estate | 2016 |
| Zazia Consulting & Sales Ltd | Professional & scientific | 2019 |
| Zazia Holdings Ltd | Real estate | 2022 |