| Yvsf Properties Ltd | Real estate | 2025 |
| YY Lets Limited | Real estate | 2026 |
| Z & Co NCL Ltd | Professional & scientific | 2019 |
| Z and N Foods Ltd | Wholesale & retail | 2015 |
| Z Bibi Properties 10 Limited | Real estate | 2025 |
| Z Bibi Properties 5 Limited | Real estate | 2025 |
| Z Law Limited | Professional & scientific | 2010 |
| Z PAC International Ltd | Wholesale & retail | 2025 |
| Z&N UK Marketing Limited | Professional & scientific | 2020 |
| Z&W Legend Limited | Wholesale & retail | 2018 |
| Z&Y Car Valet Limited | Wholesale & retail | 2026 |
| Z7 Group Ltd | Real estate | 2026 |
| Zaap Electrical Services Ltd | Construction | 2016 |
| Zaar Investments Ltd | Real estate | 2019 |
| ZAB Investments (UK) Limited | Real estate | 2020 |
| Zabko Services Ltd | Construction | 2019 |
| Zack's Barber Byker Ltd | Other services | 2024 |
| Zack's Barber NE Ltd | Other services | 2020 |
| Zagros Barber Shop Ltd | Other services | 2024 |
| Zagros Trading Limited | Wholesale & retail | 2002 |
| ZAH Store Limited | Wholesale & retail | 2025 |
| Zahra Properties Limited | Professional & scientific | 2003 |
| Zahra's Household Ltd | Wholesale & retail | 2023 |
| Zain Lounge Limited | Hospitality | 2026 |
| Zain Phone and Vape Shop Ltd | Wholesale & retail | 2025 |
| ZAK Calder Engineering Ltd | Professional & scientific | 2021 |
| ZAK Properties Group Limited | Real estate | 2018 |
| Zakariya Services Ltd | Health & social care | 2020 |
| Zakbuymycar Ltd | Wholesale & retail | 2025 |
| Zakiant Technologies Limited | Information & communication | 2025 |
| Zalam Limited | Information & communication | 2016 |
| Zaltek Limited | Information & communication | 2007 |
| ZAM ALI Properties Limited | Real estate | 2025 |
| ZAM ZAM NCL Limited | Hospitality | 2025 |
| Zaman and Sons Limited | Real estate | 1997 |
| Zaman Electrics Ltd | Construction | 2021 |
| Zaman Real Estate Ltd. | Real estate | 2016 |
| Zamian Investment Group Limited | Financial services | 2024 |
| Zamindar Ltd | Real estate | 2016 |
| Zamor Ltd | Wholesale & retail | 2026 |
| Zamzam Shirzad Ltd | Wholesale & retail | 2025 |
| Zanders Hair Design Ltd | Other services | 2007 |
| Zanyar Auto Ltd | Wholesale & retail | 2025 |
| Zapallar Ltd | Real estate | 2023 |
| Zapatista Two Limited | Hospitality | 2013 |
| Zapp Electric Vehicles Limited | Manufacturing | 2017 |
| Zara Commercial Limited | Real estate | 1999 |
| Zara Developments Limited | Construction | 2001 |
| Zara Holdings Limited | Real estate | 1997 |
| Zara Residential Limited | Real estate | 1999 |
| Zareen Tandoori Ltd | Hospitality | 2023 |
| Zaxz Ltd | Wholesale & retail | 2020 |
| ZCM Holdings Ltd | Real estate | 2020 |
| Zean (NE) Ltd | Hospitality | 2018 |
| Zebib Trading Ltd | Wholesale & retail | 2026 |
| Zebra Business Services Limited | Professional & scientific | 2023 |
| Zebra Snags Ltd | Construction | 2022 |
| Zebraland Property Consultancy (UK) Limited | Real estate | 2023 |
| ZEE Barber Ponteland Ltd | Other services | 2022 |
| ZEE Cars London Ltd | Wholesale & retail | 2022 |
| ZEE Sell Well Ltd | Wholesale & retail | 2025 |
| ZEE Selling Ltd | Wholesale & retail | 2025 |
| Zee's Beans Ltd | Hospitality | 2021 |
| Zeemu Limited | Wholesale & retail | 2018 |
| Zeeshan International Limited | Other services | 2009 |
| Zege Sports Ltd | Wholesale & retail | 2018 |
| Zeitgeist Publishing Limited | Information & communication | 2016 |
| Zelvin Trading Ltd | Households | 2025 |
| Zemsports Limited | Arts & recreation | 2014 |
| ZEN Casa Living Ltd | Real estate | 2024 |
| ZEN Collectibles Ltd | Wholesale & retail | 2021 |
| ZEN Massage Ltd | Health & social care | 2025 |
| ZEN Multi Consult Ltd | Administrative & support | 2024 |
| Zencity Limited | Other services | 2011 |
| Zendo Consulting Ltd | Professional & scientific | 2025 |
| Zenith Beauty Ltd | Other services | 2026 |
| Zenith Business Village (Devco) Ltd. | Real estate | 2007 |
| Zenith Car Hire Ltd | Other services | 2015 |
| Zenith Legal Services Group Limited | Financial services | 2025 |
| Zenith Merchandise Ltd. | Wholesale & retail | 2014 |
| Zenith Pivotal Ltd | Wholesale & retail | 2018 |
| Zenith Renewable Energy Consultants Limited | Construction | 2025 |
| Zenith Systems Ltd | Information & communication | 2020 |
| Zenko Consulting Ltd | Professional & scientific | 2024 |
| Zenobia Street Food Ltd | Manufacturing | 2021 |
| Zenos Centric Ltd | Wholesale & retail | 2024 |
| Zenos Tech Ltd | Information & communication | 2012 |
| Zenpharm Aesthetics Limited | Health & social care | 2022 |
| Zentrix Group Limited | Administrative & support | 2025 |
| Zephyrus Arts Ltd | Professional & scientific | 2025 |
| Zequence Digital UK Ltd | Information & communication | 2025 |
| Zero 55 Limited | Professional & scientific | 2021 |
| Zero Carbon Holdings Limited | Administrative & support | 2013 |
| Zero Carbon Lettings Ltd | Construction | 2022 |
| Zero Salon Ltd | Health & social care | 2022 |
| Zero Taxis Ltd | Administrative & support | 2021 |
| Zero Transport Ltd | Transport & logistics | 2023 |
| Zero Transport NE Ltd | Transport & logistics | 2025 |
| Zero Waste North East Limited | Water & waste | 2026 |
| ZERO226 Performance Ltd | Professional & scientific | 2010 |