| Hinchliffe Heating Limited | Construction | 2014 |
| HJI Property Ltd | Real estate | 2026 |
| HMG Holdings Ltd | Financial services | 2018 |
| HMS Commercial Consultants Limited | Professional & scientific | 2010 |
| Honey & Whisk Ltd | Manufacturing | 2026 |
| Hopetown Club Ltd | Hospitality | 2025 |
| Horbury Garage Ltd | Wholesale & retail | 2015 |
| Horizon Platform Sales Limited | Extraterritorial | 2010 |
| Horizon Platforms Limited | Administrative & support | 2007 |
| Horse & Jockey Altofts Limited | Hospitality | 2025 |
| Hough Enterprises Limited | Wholesale & retail | 2022 |
| Howell Holdings Ltd | Financial services | 2018 |
| Hristov Courier Services Ltd | Transport & logistics | 2017 |
| Hs-One Marketing Agency Limited | Professional & scientific | 2015 |
| HW Process Technologies Ltd | Professional & scientific | 2025 |
| HW Thermal Ltd | Professional & scientific | 2024 |
| IAN Beavors Consulting Ltd | Professional & scientific | 2019 |
| IAN Burgess Cars Limited | Other services | 2023 |
| Ice Wave Ltd | Information & communication | 2009 |
| ICL Corporate & Commercial Law Ltd | Professional & scientific | 2023 |
| Ideal AV Ltd | Wholesale & retail | 2014 |
| IDW Developments Limited | Construction | 2019 |
| Ikoms UK Ltd | Public administration | 2026 |
| IMF Solutions Limited | Professional & scientific | 2018 |
| Immanuelz Ltd | Transport & logistics | 2026 |
| Inline Wheel Alignment Limited | Wholesale & retail | 2023 |
| Inspired Progress Limited | Other services | 2015 |
| Instant Training Limited | Extraterritorial | 2012 |
| Integrated Ironmongery Solutions Limited | Wholesale & retail | 2022 |
| Integrated Training Solutions Limited | Extraterritorial | 2010 |
| Intravat Limited | Professional & scientific | 1995 |
| Inuit Northern Properties Ltd | Real estate | 2021 |
| Invisihear Ltd | Wholesale & retail | 2013 |
| Isabella Moon Limited | Wholesale & retail | 2019 |
| Ismenis Beauty Aesthetics Ltd. | Other services | 2020 |
| It's Grim UP North Running Limited | Arts & recreation | 2020 |
| Iwithy Limited | Transport & logistics | 2026 |
| IWO Transport Ltd | Transport & logistics | 2014 |
| J C Flooring Underlay & Accessories Ltd | Wholesale & retail | 2025 |
| J C P Hinchliffe Limited | Real estate | 2010 |
| J M Tilford Joinery Limited | Construction | 2002 |
| J Sekabibi Ltd | Health & social care | 2022 |
| J Young & SON (Funeral Directors) Ltd | Other services | 2015 |
| J&J Plumbing & Renovations Ltd | Construction | 2026 |
| J. Middleton & Sons Limited | Transport & logistics | 2015 |
| Jackdaw 2023 Limited | Wholesale & retail | 2023 |
| James Edwards Holdings Limited | Financial services | 2023 |
| Jason C Storey Haulage Limited | Transport & logistics | 2019 |
| JB Electrical & Automation Services Ltd | Professional & scientific | 2020 |
| JBB Networks Ltd | Information & communication | 2019 |
| JBC Group Limited | Financial services | 1998 |
| JBC Industrial Services Limited | Construction | 1986 |
| JBM Homes Limited | Real estate | 2014 |
| JC. Concrete Repairs. Limited | Construction | 2017 |
| Jcmc Group Ltd | Manufacturing | 2025 |
| JD Electrical Contactors Ltd | Construction | 2025 |
| JDE Electrical Services Limited | Construction | 2022 |
| JDH Electrical Engineering Services Ltd | Construction | 2018 |
| JDP Utility Services Ltd | Construction | 2026 |
| Jenks Properties Ltd | Real estate | 2023 |
| Jeyoge Healthcare Limited | Health & social care | 2024 |
| Jinnas Bar Ltd | Hospitality | 2025 |
| JJK Holdings Limited | Financial services | 2025 |
| Jlmt Property Holdings Ltd | Real estate | 2026 |
| JM Electrical Contractors Limited | Construction | 2004 |
| Jodie Evans Educate & Training Limited | Education | 2022 |
| John Haulage Ltd | Transport & logistics | 2018 |
| Johnsons Toffees Group Ltd | Manufacturing | 2024 |
| Johnsons Toffees Limited | Extraterritorial | 2015 |
| Joseph C Roberts (Property Holdings) Ltd | Real estate | 2024 |
| Joseph C Roberts Funeral Services Ltd | Other services | 1996 |
| Jp&Vt Limited | Other services | 2024 |
| JR Eatables Ltd | Wholesale & retail | 2025 |
| JRB Electrical and Security Limited | Construction | 2024 |
| JSMITH111 Ltd | Transport & logistics | 2026 |
| Jsquared Joinery Limited | Construction | 2023 |
| Julie's Carpets & Flooring Limited | Construction | 2022 |
| Just Folders Limited | Manufacturing | 2007 |
| JVC Consultancy Ltd | Professional & scientific | 2022 |
| K and M Homes (Wakefield) Limited | Real estate | 2006 |
| K D Plant & HGV Services Ltd | Wholesale & retail | 2021 |
| K D Road Transport Engineers Ltd | Wholesale & retail | 2025 |
| K-Print Limited | Manufacturing | 2020 |
| Kamar Properties Limited | Real estate | 2021 |
| Katako Ltd | Transport & logistics | 2018 |
| KC Property Services Limited | Real estate | 2002 |
| Kelgeo Limited | Wholesale & retail | 2024 |
| Kelling Group Limited | Financial services | 2017 |
| Kelling Midco Limited | Professional & scientific | 2014 |
| Kelling Property Limited | Professional & scientific | 2014 |
| Kettar Limited | Transport & logistics | 2016 |
| Keye Traders Ltd | Wholesale & retail | 2022 |
| Kezs Bargain Busters Ltd | Wholesale & retail | 2019 |
| Khiskoli Ltd | Extraterritorial | 2007 |
| Kinwood Care Limited | Health & social care | 2025 |
| Kirklees CA Limited | Health & social care | 2022 |
| KJT Route to Retail Ltd | Professional & scientific | 2026 |
| Komfi (UK) Limited | Wholesale & retail | 2002 |
| Kongsberg Actuation Systems Limited | Manufacturing | 2007 |
| Kryza Ltd | Real estate | 2019 |