| HR Caddy Group Limited | Financial services | 2025 |
| HR Caddy Ltd | Administrative & support | 2005 |
| HR Halo Ltd | Administrative & support | 2025 |
| HR Medical Services Limited | Health & social care | 2010 |
| HR UN Limited | Administrative & support | 2011 |
| HR21 Consultancy Ltd | Administrative & support | 2018 |
| HRB Solutions Ltd | Information & communication | 2026 |
| HRM Technology Ltd | Wholesale & retail | 2019 |
| HSA Finance Limited | Financial services | 2025 |
| HSD Pharma Ltd | Health & social care | 2020 |
| HSM UK Trading Ltd | Wholesale & retail | 2021 |
| HSR Capital Limited | Real estate | 2017 |
| HSZ Synergistics Ltd | Real estate | 2005 |
| Hub Accommodation Ltd | Real estate | 2018 |
| Hub Hire Limited | Administrative & support | 2008 |
| Huddlesford Investments Ltd | Real estate | 2018 |
| Hudkora Academy Ltd | Information & communication | 2025 |
| Hudson Phoenix Limited | Professional & scientific | 2017 |
| Hughie Willett Machinery Limited | Wholesale & retail | 2002 |
| Hull Portfolio Ltd | Professional & scientific | 2005 |
| Hulls Environmental Services Limited | Other services | 2012 |
| Hullternative Pest Control Services Limited | Other services | 2005 |
| Human Asset Management Ltd | Administrative & support | 2017 |
| Humans Properties Ltd | Real estate | 2025 |
| Humberstone Estates Limited | Real estate | 2014 |
| Humberstones (FS) Limited | Professional & scientific | 2014 |
| Humble Expert Consultancy Limited | Administrative & support | 2020 |
| Humbleton Barn Limited | Arts & recreation | 2020 |
| Humbleton Barn Well-Being Limited | Other services | 2022 |
| Humera Limited | Information & communication | 2026 |
| Humphreston Investments Limited | Financial services | 2015 |
| Hunger Limited | Hospitality | 2017 |
| Hunkydory Strategy Consultancy Ltd | Professional & scientific | 2020 |
| Hunnypot Cottage Ltd | Manufacturing | 2022 |
| Hunter Tech Service Ltd | Professional & scientific | 2026 |
| Hunters Funeral Directors Limited | Extraterritorial | 2001 |
| Hunts Cross Supper Bar Limited | Hospitality | 2013 |
| Hutcheson Management Services Limited | Professional & scientific | 2018 |
| Huttons Homes Limited | Real estate | 2023 |
| HUW Howland Properties Ltd | Real estate | 2026 |
| HUZ Artz Limited | Construction | 2025 |
| HVW Financial Consulting Limited | Financial services | 2020 |
| Hybion Limited | Construction | 2025 |
| HYD Greenfield Ltd | Real estate | 2022 |
| Hydes Road Fish Bar Limited | Hospitality | 2026 |
| Hydro Farms Ltd | Wholesale & retail | 2025 |
| Hydro Mechanical Services Limited | Other services | 1975 |
| Hydro Window Cleaning Ltd | Administrative & support | 2025 |
| Hyper-Conduit Ltd | Information & communication | 2022 |
| I & B Halal Meats Ltd | Wholesale & retail | 2025 |
| I & H Capital Limited | Real estate | 2025 |
| I C Stewart Limited | Administrative & support | 2011 |
| I CAN Achieve C.I.C. | Professional & scientific | 2023 |
| I Couriers Ltd | Other services | 2024 |
| I K Corporation Ltd | Hospitality | 2023 |
| I K Property Ltd | Real estate | 2024 |
| I M Electrical (Midlands) Limited | Construction | 2024 |
| I Need a Mechanic Ltd | Professional & scientific | 2026 |
| I Smoke Limited | Wholesale & retail | 2023 |
| I-Move Estates Ltd | Real estate | 2010 |
| I.E.M Lean Consulting Ltd | Professional & scientific | 2016 |
| I.O Structures Ltd | Professional & scientific | 2025 |
| I4 Technical Limited | Professional & scientific | 2022 |
| IA ENT Ltd | Health & social care | 2025 |
| Iacta Alea Ltd | Information & communication | 2023 |
| Iamyogi Limited | Arts & recreation | 2018 |
| IAN Bennett Consulting Ltd | Professional & scientific | 2013 |
| IAN Clarke Funeral Service Limited | Extraterritorial | 2003 |
| IAN HAY Limited | Professional & scientific | 2018 |
| IAN Hazel Funerals Limited | Wholesale & retail | 1987 |
| IAN Salmons Limited | Professional & scientific | 2019 |
| IAS Medical Services Ltd | Health & social care | 2018 |
| Ibeam Structural Ltd | Professional & scientific | 2012 |
| Ibsar Ltd | Health & social care | 2020 |
| IC Mccormack Ltd | Transport & logistics | 2021 |
| Icenordic Limited | Wholesale & retail | 2013 |
| ICG Holdings Ltd | Financial services | 2026 |
| ICK Care Ltd | Health & social care | 2013 |
| Iclaims Consults Ltd | Professional & scientific | 2026 |
| Icon Services Midlands Ltd | Manufacturing | 2023 |
| Idea Trading Ltd | Wholesale & retail | 2022 |
| Ideal Lawncare (West Midlands) Ltd | Administrative & support | 2023 |
| IE Materials Ltd | Wholesale & retail | 2025 |
| Ifeatuzy Ltd | Administrative & support | 2023 |
| Ifeomall Ltd | Transport & logistics | 2023 |
| IG Detailing Ltd | Wholesale & retail | 2021 |
| IG Transport (BHX) Ltd | Transport & logistics | 2023 |
| IGA Contractors Ltd | Construction | 2019 |
| IGD Global Limited | Wholesale & retail | 2014 |
| IGD Group Ltd | Wholesale & retail | 2025 |
| Ignite Communications Limited | Administrative & support | 2022 |
| Ignite Health & Performance Limited | Arts & recreation | 2011 |
| Ignite Performance Consultancy Ltd | Professional & scientific | 2024 |
| IHB Ventures Ltd | Real estate | 2024 |
| IIN Consulting Limited | Professional & scientific | 2022 |
| IIN Property Limited | Real estate | 2024 |
| IJD Solutions Ltd | Construction | 2026 |
| IJR Services Limited | Administrative & support | 2012 |
| Ikon Kitchens Ltd | Wholesale & retail | 2014 |
| Illuminate QA Limited | Professional & scientific | 2021 |