| Holmes Noble Consulting Limited | Administrative & support | 2017 |
| Holmes Noble Limited | Administrative & support | 2005 |
| Holt Bidco Limited | Financial services | 2018 |
| Holt Holdco Limited | Financial services | 2018 |
| Holt Midco Limited | Financial services | 2018 |
| Homes by Hatch Limited | Real estate | 2026 |
| Hopwell Limited | Real estate | 1999 |
| Hornfords Ltd | Construction | 2025 |
| Hortonsrichardlocke Ltd | Real estate | 2026 |
| Houghton Software Limited | Information & communication | 2025 |
| Howe Futures Limited | Professional & scientific | 2026 |
| Howell Developments Limited | Manufacturing | 2008 |
| HR Contacting & Agri Services Ltd | Agriculture & fishing | 2024 |
| Hsjm Limited | Real estate | 2020 |
| HT (Europe) Limited | Wholesale & retail | 2017 |
| Hughes-Sennett Business Services Limited | Real estate | 2004 |
| Humco Ltd | Construction | 2023 |
| Hummocksavanna Care Limited | Administrative & support | 2015 |
| Hunts Mechs Limited | Administrative & support | 2015 |
| Huqory Ltd | Wholesale & retail | 2019 |
| Huwood International Limited | Professional & scientific | 1914 |
| I'M Homeless GET ME OUT of Here CIC | Health & social care | 2022 |
| Ianikki Limited | Professional & scientific | 2019 |
| IBO Construction Limited | Construction | 2012 |
| IBO Holdings Limited | Financial services | 2015 |
| IE Donnelly Ltd | Administrative & support | 2021 |
| IGH Solutions Ltd | Administrative & support | 2015 |
| IK Lifting Limited | Wholesale & retail | 2009 |
| Impact Mobile Car Bodyshop Limited | Wholesale & retail | 2026 |
| IMS Pro Ltd | Information & communication | 2025 |
| Inamac (Phoenix) Limited | Real estate | 2013 |
| Inaparc Limited | Manufacturing | 2009 |
| Incola Ltd | Professional & scientific | 2020 |
| Indication Ltd | Wholesale & retail | 2026 |
| Indiewealth Ltd | Administrative & support | 2019 |
| Indigo Pretzel Group Limited | Financial services | 2024 |
| Indigo Pretzel Ltd | Wholesale & retail | 2022 |
| Indigo Pretzel Properties Limited | Real estate | 2025 |
| Industrial H V Solutions Limited | Wholesale & retail | 2016 |
| Industrial Shutter Ltd | Manufacturing | 2024 |
| Industrialmachines.Net Limited | Wholesale & retail | 1998 |
| Infinity Flooring Group Limited | Administrative & support | 2018 |
| Infrastructure and Utility Management Services Ltd | Professional & scientific | 2012 |
| Ingram Marriott Consulting Limited | Professional & scientific | 2006 |
| Innovate DA Limited | Education | 2024 |
| Insertsdirect.Com Limited | Wholesale & retail | 2003 |
| Insider Pro Ltd | Administrative & support | 2018 |
| Insider Procurement Ltd | Administrative & support | 2018 |
| Insight Assessment Services Limited | Health & social care | 2013 |
| Insight Regulatory Consultancy Ltd | Professional & scientific | 2019 |
| Inspire Camper Hire Ltd | Administrative & support | 2022 |
| Instaworkforce Ltd | Administrative & support | 2019 |
| Integrated Scaffold Services Limited | Construction | 2018 |
| Integrated Trading Ltd | Manufacturing | 2018 |
| Interlogik Limited | Professional & scientific | 2015 |
| Iron Mind Crossfit Ltd | Arts & recreation | 2018 |
| Itec Global Limited | Education | 2015 |
| IVY Architectural Services Ltd | Professional & scientific | 2013 |
| J & S a Consultancy Limited | Administrative & support | 1990 |
| J D Bate Limited | Construction | 2008 |
| J E T Bale Building Services Limited | Construction | 2003 |
| J Hiles Consulting Ltd | Professional & scientific | 2021 |
| J Jeremias Contractors Limited | Construction | 2014 |
| J P Willoughby ( North ) Limited | Construction | 2023 |
| J S Biddle Accounting Limited | Professional & scientific | 2016 |
| J Willetts Plumbing Services Limited | Construction | 2021 |
| J. a. K. Water Systems Limited | Water & waste | 2003 |
| J.C.J. Futures Limited | Construction | 2010 |
| J.E.R. Marketing Limited | Professional & scientific | 2015 |
| J.H. Butcher & Company Limited | Manufacturing | 1994 |
| Jadella Consultants Limited | Professional & scientific | 2022 |
| Jadepalm Limited | Information & communication | 2000 |
| James Birks Ltd | Administrative & support | 2014 |
| James Styles & Whitlock Limited | Administrative & support | 2002 |
| Jays Developments Ltd | Construction | 2021 |
| JB Chaplin Limited | Extraterritorial | 2008 |
| JB Sporthomes Ltd | Manufacturing | 2022 |
| Jbaccounts Ltd | Professional & scientific | 2019 |
| Jbhco Ltd | Wholesale & retail | 2024 |
| JD Woodburners Limited | Construction | 2025 |
| JDL Development (Midlands) Limited | Real estate | 2020 |
| JDL Roofing & Building Limited | Construction | 2013 |
| Jechanzi Ltd | Financial services | 2025 |
| Jellymud Ltd | Wholesale & retail | 2019 |
| Jeot Limited | Real estate | 2018 |
| Jerry O'Sullivan and SON Limited | Other services | 2009 |
| Jewell Podiatry Limited | Health & social care | 2012 |
| JF Heat Services Limited | Construction | 2024 |
| Jfdia Limited | Professional & scientific | 2022 |
| JFP Property Investments Ltd | Real estate | 2025 |
| JGM UK Limited | Information & communication | 2006 |
| Jigsaw Design & Print Limited | Manufacturing | 2004 |
| JJ Bloodstock Limited | Agriculture & fishing | 2023 |
| JJD Consultancy Ltd | Transport & logistics | 2026 |
| JLP Payroll Services Limited | Administrative & support | 2004 |
| Joel Elvidge Limited | Manufacturing | 2021 |
| John Chivers Commercial Limited | Real estate | 1999 |
| John Hill Labour Services Ltd | Other services | 2019 |
| John M Allen Transport Limited | Information & communication | 1997 |
| Joyce Robertson Emerson Limited | Extraterritorial | 2025 |