| Indaver Solvents Huddersfield Ltd | Manufacturing | 2025 |
| Indaver Solvents Limited | Manufacturing | 2006 |
| Indaver UK Limited | Water & waste | 2007 |
| Independent Venue Week Ltd | Arts & recreation | 2011 |
| Infinity Property Partners Ltd | Households | 2024 |
| Infinity Resourcing Group Ltd | Administrative & support | 2019 |
| Inglewood Farm Management Company Ltd | Households | 2022 |
| Innuscience UK Limited | Manufacturing | 2022 |
| Interact Design Ltd | Professional & scientific | 2010 |
| Interpack Machinery & Services Limited | Manufacturing | 1995 |
| Intertechnic U.K. Limited | Wholesale & retail | 1998 |
| Intomove Ltd | Manufacturing | 2017 |
| Investnorthwest Limited | Professional & scientific | 1999 |
| Invisigroup Limited | Wholesale & retail | 2023 |
| Irlam International Logistics Ltd | Transport & logistics | 2026 |
| Irlam International Ltd | Transport & logistics | 2008 |
| Isotopx Ltd | Manufacturing | 2007 |
| IT and Beyond Ltd | Information & communication | 2022 |
| J & L Locksmiths Ltd | Administrative & support | 2022 |
| J K Business Consultancy Ltd | Professional & scientific | 2014 |
| J Staley Limited | Wholesale & retail | 2020 |
| J.J.C. Utilities Limited | Other services | 2015 |
| JAC Plumbing and Heating Engineers Ltd | Construction | 2015 |
| Jackiss Consultants UK Ltd | Administrative & support | 2018 |
| JAG Training & Consultancy Limited | Professional & scientific | 2025 |
| JAS Finance Limited | Professional & scientific | 2017 |
| Jason Group (Holdings) Ltd | Financial services | 2019 |
| Jason Walklate Properties Ltd | Real estate | 2019 |
| JBL Renewables Limited | Construction | 2022 |
| JCM Ventures Ltd | Wholesale & retail | 2022 |
| JD Consulting INS Ltd | Professional & scientific | 2025 |
| Jeremy Phipps Limited | Construction | 2014 |
| JFS Property Ltd | Real estate | 2025 |
| JIA YAO Limited | Hospitality | 2014 |
| Jill Biggins Ltd | Health & social care | 2009 |
| JJ PVT. Ltd. | Wholesale & retail | 2026 |
| JJP Roofing & Building Ltd | Construction | 2023 |
| JMA Facade Design Limited | Professional & scientific | 2017 |
| JMS Cleaning Services (UK) Ltd | Administrative & support | 2013 |
| Joblett Limited | Professional & scientific | 2022 |
| Josh Neild Design Limited | Professional & scientific | 2021 |
| Josoto Trading Ltd | Water & waste | 2013 |
| JSH Care Services Limited | Administrative & support | 2011 |
| Juise Properties Limited | Real estate | 2025 |
| Julian Bland Limited | Other services | 2013 |
| JW Accident Repairs Limited | Wholesale & retail | 2020 |
| K Cagna Contractors Limited | Construction | 2017 |
| K M a Livestock Limited | Wholesale & retail | 2021 |
| K Morgan Consultancy Services Ltd | Other services | 2025 |
| K2H Kanya Leisure and Hospitality Group Ltd | Hospitality | 2025 |
| K8 Consultancy Services Ltd | Professional & scientific | 2022 |
| Kassian Technology Limited | Information & communication | 2021 |
| KB Transporter Ltd | Construction | 2017 |
| KCV (Properties) Limited | Real estate | 2012 |
| Kebab Palace Ltd | Hospitality | 2023 |
| Keene Lineage Limited | Professional & scientific | 2024 |
| Ken-Tron Wire UK LLP | | 2023 |
| Kentra Training Limited | Education | 2010 |
| Keracolor Ltd | Manufacturing | 2015 |
| Killin Estate Ltd | Agriculture & fishing | 2024 |
| Killyglen Aerotech Ltd | Manufacturing | 2017 |
| Kinderton Farm Barns (Management Company) Limited | Households | 2007 |
| Kings Court Cafe Limited | Hospitality | 2013 |
| Kings Lock Boatyard Limited | Real estate | 2014 |
| Kingslock Chandlery Limited | Wholesale & retail | 2003 |
| KIT Traders Ltd | Manufacturing | 2010 |
| Knutsford Construction Limited | Construction | 2007 |
| Koala Accountancy Limited | Professional & scientific | 2016 |
| Konifer Textiles Limited | Manufacturing | 2025 |
| Ksivf Ltd | Professional & scientific | 2021 |
| L & E Developments Ltd | Construction | 2002 |
| LABD83 Ltd | Information & communication | 2025 |
| Laidir 1938 Ltd | Real estate | 1989 |
| LAIDIR1975 Limited | Financial services | 2020 |
| Land Ranger Services Limited | Wholesale & retail | 1978 |
| Langley Dairy Products Ltd | Administrative & support | 2009 |
| Lauren's Little Big Swim Ltd | Education | 2023 |
| LB Ventures Limited | Wholesale & retail | 2012 |
| LD Cheshire Logistics Ltd | Construction | 2026 |
| Leasetech Limited | Professional & scientific | 2017 |
| Lechler Coatings Limited | Wholesale & retail | 1995 |
| LEE Brother Property Holdings Limited | Real estate | 2025 |
| LEE888 Ltd | Construction | 2025 |
| Lenton Holdings Limited | Professional & scientific | 2006 |
| Levelz Kennelz Ltd | Agriculture & fishing | 2022 |
| Limitless Lift Supplies Ltd | Wholesale & retail | 2024 |
| Liptov Plumbing and Heating Limited | Construction | 2024 |
| Lister Solutions Limited | Professional & scientific | 2009 |
| Llar Property Ltd | Real estate | 2022 |
| Local Roofing & Guttering Ltd | Construction | 2025 |
| Lock 71 Ltd | Hospitality | 2022 |
| Loomworks Ltd | Wholesale & retail | 2016 |
| Lowe Davidson Foods Ltd | Manufacturing | 2025 |
| LSN Takeaway Ltd | Hospitality | 2026 |
| LT 1992 Limited | Arts & recreation | 2011 |
| Luar Furniture Limited | Manufacturing | 2021 |
| Lulo Creative Ltd | Professional & scientific | 2021 |
| Lynch Family Housing Ltd | Real estate | 2021 |
| M & S Barnton Limited | Wholesale & retail | 2006 |
| M C Treatments Limited | Health & social care | 2007 |