| Honeylodge Limited | Construction | 2015 |
| Hook OR by Crook Ltd | Transport & logistics | 2012 |
| Hopkin Smart Consulting Ltd | Professional & scientific | 2015 |
| Hopkin Yates Property Ltd | Real estate | 2015 |
| Horatio Ringblower Limited | Manufacturing | 2019 |
| Horse Drawn Occasions Ltd | Other services | 2016 |
| Hospserv Limited | Administrative & support | 2020 |
| Howards Amusements Ltd | Arts & recreation | 2014 |
| Howells Turner Ltd | Real estate | 2025 |
| Hqn.Fm Limited | Financial services | 2023 |
| HR Support 4U Ltd | Administrative & support | 2013 |
| HRH Fit Ltd | Education | 2023 |
| HRS Plumbing and Heating Ltd | Construction | 2023 |
| Hudson and Davis Endoscopy Services Limited | Health & social care | 2022 |
| Hudson's Property Services Limited | Real estate | 2014 |
| Hudsons Facilities Ltd | Administrative & support | 2022 |
| Hudsons Plant Centre (Bedford) Ltd | Wholesale & retail | 2020 |
| Hudsons Plant Centre (Derby) Ltd | Agriculture & fishing | 2018 |
| Hudsons Plant Centre (Warrington) Limited | Wholesale & retail | 2021 |
| Hugo Painting Contractors Ltd | Construction | 2014 |
| Humech Services Ltd | Construction | 2019 |
| Hunt's Emporia Ltd | Wholesale & retail | 2021 |
| Hyphen Creative Limited | Administrative & support | 2017 |
| I D Fencing Midlands Limited | Construction | 2005 |
| I M Plumbing & Heating Limited | Construction | 2001 |
| I Surridge Ltd | Construction | 2026 |
| I&H Consulting Limited | Professional & scientific | 2015 |
| I-Trust HR Limited | Administrative & support | 2014 |
| I.T Mortgage Services Ltd | Financial services | 2002 |
| IAN Phillips Collision Investigation Consultants Limited | Administrative & support | 2020 |
| IB Electrical Services Limited | Construction | 2016 |
| Ibex Industries Limited | Professional & scientific | 2008 |
| ICF Tech Limited | Construction | 2006 |
| Icon Motor Company Limited | Wholesale & retail | 2022 |
| Ijpuk Solutions Limited | Information & communication | 2018 |
| Ikon Change Ltd | Professional & scientific | 2013 |
| Ikon Solutions Ltd | Wholesale & retail | 2018 |
| Immerse Gyms Ltd | Wholesale & retail | 2023 |
| Impactful Solutions Ltd | Professional & scientific | 2024 |
| IN Business Support Ltd | Administrative & support | 2023 |
| Incastack Ltd | Information & communication | 2025 |
| Independent Clinical Practitioner Limited | Health & social care | 2022 |
| Indigo Drum Communications Limited | Administrative & support | 2019 |
| Infinity Pathways Ltd | Health & social care | 2024 |
| Infoodspec.Com Limited | Information & communication | 2014 |
| Ingleside Associates Ltd | Professional & scientific | 2016 |
| Inka Studios Limited | Other services | 2007 |
| Inka Tattoos Derby Ltd | Other services | 2024 |
| Innovare Offsite Limited | Construction | 2023 |
| Insight Advertising & Promotions Limited | Professional & scientific | 2001 |
| Insight Engineering Solutions Ltd | Professional & scientific | 2019 |
| Inspection Qualification Consultancy Limited | Professional & scientific | 2019 |
| Integrated Building Management Systems Ltd. | Information & communication | 1979 |
| Intellimag Ltd | Information & communication | 2008 |
| Intentiq Ltd | Information & communication | 2026 |
| Interior Stone Features Limited | Water & waste | 1983 |
| Invzn Limited | Real estate | 2024 |
| Isaver Limited | Extraterritorial | 2013 |
| ITS Your BNB Limited | Hospitality | 2018 |
| Ivory White Bridal Limited | Wholesale & retail | 2016 |
| Izaak Walton Close 1960 Limited | Extraterritorial | 2014 |
| J & D Leisure Limited | Administrative & support | 2013 |
| J & D Storage Limited | Real estate | 2026 |
| J & M Roofing (East Midlands) Ltd. | Construction | 2018 |
| J C Balls & Sons Limited | Construction | 2002 |
| J D Davies Limited | Construction | 2003 |
| J J Social Work Solutions Ltd | Health & social care | 2019 |
| J Magill Electrical Limited | Construction | 2014 |
| J Marshall Holdings Ltd | Real estate | 2025 |
| J Mizon Construction Limited | Construction | 2018 |
| J Quigg Enterprises Limited | Hospitality | 2014 |
| J R Drainage Solutions Ltd | Water & waste | 2020 |
| J S Builders (Belper) Limited | Construction | 2024 |
| J Sykes Developments Ltd | Construction | 2019 |
| J T GAS Limited | Construction | 2008 |
| J Taylor Design and Drafting Ltd | Professional & scientific | 2025 |
| J Young Engineering (UK) Ltd | Manufacturing | 2011 |
| J&D Farms Ltd | Agriculture & fishing | 2014 |
| J&L EPC Solutions Ltd | Professional & scientific | 2025 |
| J'Adore MA VIE Limited | Wholesale & retail | 2013 |
| J. Annable Electrical Services Ltd | Construction | 2011 |
| J. Binns Plant Maintenance Limited | Manufacturing | 2004 |
| J.R.Lilley Consultant Ltd | Households | 2025 |
| Jack & Nory Limited | Professional & scientific | 2010 |
| Jackass Farm Ltd | Wholesale & retail | 2026 |
| Jade Garden 2023 Limited | Hospitality | 2023 |
| Jade Tattoo Ltd | Other services | 2025 |
| Jafel Ltd | Professional & scientific | 2026 |
| Jagg Properties Ltd | Real estate | 2021 |
| Jake Verma Consulting Ltd | Information & communication | 2023 |
| Jaks Land & Property Ventures Ltd | Real estate | 2023 |
| James at Calverts Limited | Other services | 2006 |
| James Beresford & Sons (1836) Ltd. | Manufacturing | 2020 |
| James Hudson(Builders)Limited | Construction | 1967 |
| James Moore Consultancy Ltd | Professional & scientific | 2024 |
| James Sutton Education Limited | Education | 2020 |
| Janus Ridgeway Limited | Manufacturing | 2018 |
| Jasper Films Ltd | Information & communication | 2012 |
| JB 56 Limited | Professional & scientific | 2012 |
| JB Electrical Systems Ltd | Construction | 2012 |