| Improvit Ltd | Information & communication | 2005 |
| Inayat Fashions Ltd | Wholesale & retail | 2025 |
| Infinity Design & Build Ltd | Professional & scientific | 2024 |
| Inform Resources Limited | Information & communication | 2023 |
| Innishammon Limited | Real estate | 2014 |
| Innkeepers Court Residents Limited | Households | 2008 |
| Innuvate Limited | Extraterritorial | 2015 |
| Inside and OUT Property Services Ltd | Manufacturing | 2025 |
| Insight Ferret Ltd | Professional & scientific | 2016 |
| Insignis Enterprises Ltd | Hospitality | 2011 |
| Inspire Design & Print Ltd | Manufacturing | 2009 |
| Intec Engineering Limited | Professional & scientific | 1994 |
| Integrated Design Solutions Limited | Professional & scientific | 2012 |
| Integrow Ltd | Administrative & support | 2020 |
| Intelligent Minds Consulting Limited | Information & communication | 2017 |
| International Golf Resort Management Ltd | Arts & recreation | 2018 |
| Inuous Limited | Professional & scientific | 2014 |
| Inuous Productions Limited | Extraterritorial | 2015 |
| Inventory Management Services Limited | Real estate | 2017 |
| Ioniktech Limited | Information & communication | 2019 |
| Iterum Clothing Limited | Wholesale & retail | 2020 |
| Its-Property Limited | Construction | 2003 |
| IZ2 Limited | Administrative & support | 2018 |
| IZ3 Limited | Extraterritorial | 2024 |
| J & J Crombie Limited | Professional & scientific | 2021 |
| J B Wise Consultants Limited | Professional & scientific | 2019 |
| J Barraclough Limited | Real estate | 2004 |
| J Basu Ltd | Administrative & support | 2025 |
| J Wilkes Paving and Construction Ltd | Construction | 2018 |
| J. & J. Estates Limited | Professional & scientific | 1992 |
| J.G. Motorsport Ltd | Arts & recreation | 2009 |
| J.N. Atelier Design Ltd | Professional & scientific | 2006 |
| J.S. Quinton Holdings Limited | Financial services | 2023 |
| Jacobs Property Solutions Limited | Construction | 2017 |
| Jaggs Consultants Limited | Professional & scientific | 2008 |
| Jamili Development Associates Limited | Administrative & support | 2015 |
| Janison Group Ltd | Information & communication | 2025 |
| Janji Holdings Ltd | Financial services | 2023 |
| Janson Family Limited | Information & communication | 2015 |
| JBA Corporation Ltd | Other services | 2017 |
| JBS Advisory Services Ltd | Professional & scientific | 2025 |
| JD Holding Group Ltd | Financial services | 2023 |
| Jeffrey Milner Limited | Construction | 1979 |
| Jeray (Sales) Limited | Wholesale & retail | 1961 |
| Jeremy Holmes Consulting Ltd | Professional & scientific | 2018 |
| Jeribre Services Ltd | Professional & scientific | 2014 |
| Jeseray Limited | Wholesale & retail | 2019 |
| Jetmere Limited | Construction | 1988 |
| JFK Solutions Limited | Professional & scientific | 2006 |
| JKL (Heaters) Limited | Construction | 1994 |
| John Randal Investments Limited | Real estate | 2022 |
| Jonesey Makes Ltd | Information & communication | 2022 |
| Jordan Engineers Ltd | Construction | 2019 |
| JRD Solutions Ltd | Professional & scientific | 2021 |
| JSF Estate Management Ltd | Agriculture & fishing | 2019 |
| JSQ Farm Enterprises Limited | Wholesale & retail | 2018 |
| JST Markers Ltd | Professional & scientific | 2025 |
| JT39 Limited | Hospitality | 2025 |
| JVS Dear LLP | | 2017 |
| K & B Family Butchers Ltd | Wholesale & retail | 2011 |
| K Johnson Brickwork Limited | Construction | 2017 |
| K2 Vaping Ltd | Wholesale & retail | 2018 |
| KAG (Property) Holdings Limited | Real estate | 2021 |
| Kamtech Vehicle Sales Ltd | Wholesale & retail | 2023 |
| Karl Thomas Limited | Professional & scientific | 2008 |
| Karma Media Limited | Information & communication | 2015 |
| Katie Baldock Ltd | Professional & scientific | 2026 |
| Katie Keith Collective Ltd | Administrative & support | 2025 |
| KCS Electrical Ltd | Construction | 2018 |
| KDA Leisure Ltd | Hospitality | 2023 |
| Keen & Able Limited | Transport & logistics | 2016 |
| Keen & Toms Holdings Limited | Professional & scientific | 2009 |
| Keen & Toms Partnership Limited | Professional & scientific | 1920 |
| Keeping the Wheels Turning Ltd | Wholesale & retail | 2025 |
| Kenning Motor Group Limited | Extraterritorial | 2020 |
| Khanix Ltd | Construction | 2026 |
| Kingfisher Contractors Limited | Administrative & support | 2020 |
| Kirklees Car Parking Limited | Administrative & support | 2014 |
| KIT Built Guitars Limited | Wholesale & retail | 2012 |
| KN Business Solutions Ltd | Professional & scientific | 2014 |
| Koech Ltd | Information & communication | 2022 |
| Koenx Limited | Information & communication | 2020 |
| KOI Water Garden Limited | Agriculture & fishing | 1997 |
| KOP Hill Consulting Ltd | Professional & scientific | 2025 |
| Kozmo International Ltd | Arts & recreation | 2012 |
| KPI Advisers Limited | Real estate | 2025 |
| Kprop Limited | Real estate | 2023 |
| KSB Ambulance Service Ltd | Health & social care | 2019 |
| LA Crepe Escape Limited | Hospitality | 2013 |
| Lacey Green & Loosley ROW Tennis Club | Arts & recreation | 2015 |
| Laminauk Ltd | Wholesale & retail | 2024 |
| Landmark Building Contractors Limited | Construction | 2016 |
| Larkhill Equine Ltd | Other services | 2016 |
| LAZ4CARPENTRY Ltd | Manufacturing | 2022 |
| LB Equestrian Ltd | Agriculture & fishing | 2023 |
| Lcvr Holdings Ltd | Professional & scientific | 2022 |
| Lcvr Property Ltd | Real estate | 2022 |
| LE Maison Bouche Ltd | Wholesale & retail | 2022 |
| LED Medical Limited | Health & social care | 2020 |
| Legacy Legends Limited | Professional & scientific | 2018 |