| HBC Construction Limited | Construction | 1993 |
| HBC Contracting Services Limited | Extraterritorial | 2010 |
| Head Tech UK Ltd | Professional & scientific | 2011 |
| Heeley Artisan Ltd | Hospitality | 2025 |
| Hillside Cuddle Club Ltd | Other services | 2026 |
| Hillside Paws for Life Ltd | Agriculture & fishing | 2020 |
| Hilltop Commercial Solutions Limited | Financial services | 2019 |
| Hire I.Q. Logistics Ltd | Information & communication | 2006 |
| Hitec Building Services Ltd | Construction | 2010 |
| Hitec Services Limited | Energy | 2005 |
| HKH Automobiles Limited | Wholesale & retail | 2024 |
| HLW 357 Limited | Manufacturing | 2008 |
| HMT Professional Services Ltd | Professional & scientific | 2025 |
| HN 2017 Limited | Professional & scientific | 2017 |
| Hobson and Spencer Housing Limited | Real estate | 2018 |
| Hobson Vision Ltd | Manufacturing | 1989 |
| Hodkin & Jones (Sheffield) Limited | Manufacturing | 2013 |
| Homes DE Will Ltd | Real estate | 2021 |
| Hope IT Sticks Ltd | Information & communication | 2025 |
| Hoprt Trustee Ltd | Professional & scientific | 2019 |
| Horsleygate Hall Limited | Real estate | 2013 |
| House of the Westwind Ltd | Arts & recreation | 2018 |
| HPC Gears International Limited | Other services | 2022 |
| HPC Gears Limited | Manufacturing | 1996 |
| HPE Pension Trustees Limited | Financial services | 2009 |
| Hsws Engineering Group Limited | Manufacturing | 2024 |
| Hurkinwood Associates Limited | Professional & scientific | 2008 |
| HUS 1848 Limited | Hospitality | 2019 |
| HUS 1850 Limited | Hospitality | 2022 |
| Hyperivn Ltd | Wholesale & retail | 2025 |
| Hysol Ltd | Administrative & support | 2013 |
| I G Architectural Services Ltd | Professional & scientific | 2009 |
| IC Architecture Ltd | Professional & scientific | 2020 |
| Iconic Car Sales Ltd | Wholesale & retail | 2024 |
| IGL 2013 Limited | Extraterritorial | 2015 |
| Ignite GAS XL Ltd | Construction | 2026 |
| Illingworth Mechanical Limited | Construction | 2006 |
| Image UP Media Limited | Information & communication | 2015 |
| In-Pack Packaging Limited | Administrative & support | 2024 |
| Indigo-Hygiene Ltd | Other services | 2018 |
| Infocus Television Ltd | Information & communication | 2004 |
| Instant Office Help Limited | Wholesale & retail | 2009 |
| Insulated Eco Studios Ltd | Professional & scientific | 2020 |
| Integrated Mechanical Services Ltd | Construction | 2018 |
| Intelligent Facility Group Limited | Administrative & support | 2022 |
| Intelligent Facility Solutions Limited | Administrative & support | 2012 |
| International Stock Ltd | Wholesale & retail | 2019 |
| Investir Ltd | Real estate | 2017 |
| IPD Property Ltd | Real estate | 2024 |
| Isophia Limited | Information & communication | 2026 |
| Iswordsius Ltd | Hospitality | 2020 |
| It's Just (Household Essentials) C.I.C. | Wholesale & retail | 2023 |
| J G W Training Limited | Information & communication | 2009 |
| J R Planning Consultancy Ltd | Administrative & support | 2016 |
| J&L Investments Limited | Real estate | 2009 |
| J. & M. Cottages Limited | Real estate | 1977 |
| J. W. Sivil Holdings Limited | Construction | 2014 |
| J. W. Sivil Trading Limited | Construction | 2013 |
| J.A. Coles and SON Limited | Construction | 1988 |
| J.P.R. Homes Limited | Construction | 2017 |
| J.Roe Developments Ltd | Construction | 2024 |
| J.W.Sivil Limited | Construction | 1933 |
| Jace Precision Engineering Limited | Manufacturing | 2019 |
| Jack Duncan Developments Limited | Construction | 2012 |
| Jackmar (UK) Ltd | Construction | 2014 |
| Jaiswal Holdings Limited | Financial services | 2013 |
| Jaiswal Property Developments Limited | Real estate | 2026 |
| Jake Eville Tree Care Ltd | Agriculture & fishing | 2025 |
| James Beake Partnership Limited | Professional & scientific | 2007 |
| James DE Will (DP) Co Ltd | Administrative & support | 2024 |
| James DE Will Property Ltd | Real estate | 2024 |
| Jano Homes Ltd | Real estate | 2024 |
| Jarvale Construction Limited | Construction | 1973 |
| Jarvale Holdings (AR) Limited | Financial services | 2020 |
| Jarvale Holdings (NH) Limited | Financial services | 2020 |
| Jarvale Properties Limited | Real estate | 2019 |
| Jasper Build Ltd | Wholesale & retail | 2020 |
| JDA Construct Ltd | Construction | 2025 |
| JDA Fire Ltd | Public administration | 2025 |
| JDA Project Services Ltd | Professional & scientific | 2018 |
| JDS Telecommunications Ltd | Information & communication | 2022 |
| Jely Investments Limited | Real estate | 2021 |
| Jenny Green Design & Decorating Specialists Limited | Construction | 2003 |
| JGW (Management) Training Ltd | Education | 2022 |
| JH Vending Limited | Wholesale & retail | 2025 |
| JJ CATERS4 Ltd | Wholesale & retail | 2024 |
| JK Leisure Clothing Limited | Wholesale & retail | 2005 |
| JL Health and Beauty Ltd | Health & social care | 2015 |
| JM Forestry Services Ltd | Agriculture & fishing | 2024 |
| JMB Building (Holmesfield) Limited | Construction | 2002 |
| Jobomo Ltd | Professional & scientific | 2025 |
| John Bateman Promotional Products Ltd | Professional & scientific | 2003 |
| Johnson Taverns Ltd | Hospitality | 2019 |
| Joseph Bathrooms Ltd | Wholesale & retail | 2019 |
| Joseph Tiles (Dronfield) Ltd | Wholesale & retail | 2024 |
| JR Ballet Coaching & Tuition Limited | Arts & recreation | 2026 |
| JT Adams Builders by Design Limited | Construction | 2005 |
| JTL Data Communications Limited | Information & communication | 2014 |
| JTP Commercials Limited | Wholesale & retail | 2026 |
| JTT Construction Services Ltd | Construction | 2015 |