| Hollis Plastering Ltd | Construction | 2019 |
| Hollywell Fields Management Company Ltd | Other services | 2015 |
| Holtom Group Limited | Wholesale & retail | 2016 |
| Holwood Pattern Company Limited | Manufacturing | 1975 |
| Home and Property Midlands Limited | Construction | 2015 |
| Home Upholstery Ltd | Other services | 2021 |
| Home Visit Pet Care Swadlincote and South Derbyshire Ltd | Professional & scientific | 2026 |
| Home-Start North West Leicestershire | Administrative & support | 2004 |
| HOME2HOME With Care Ltd | Health & social care | 2018 |
| Homebank UK Limited | Real estate | 2002 |
| Homely Lily Ltd | Real estate | 2023 |
| Homemade and Delicious Ltd | Information & communication | 2017 |
| Homes 4 Business Limited | Real estate | 2006 |
| Honey Hill Farmhouse Ltd | Real estate | 2025 |
| Hopewell Holdings Ltd | Real estate | 2021 |
| Hopton Rise Management Company Limited | Households | 2014 |
| Hopwas Properties Limited | Real estate | 2000 |
| Hopwood Management Company Number 1 Limited | Households | 2007 |
| Horizons (Bishops Cleeve) Management Company Limited | Households | 2021 |
| Hot Mess Fitness Ltd | Arts & recreation | 2026 |
| Houghton Conquest Residents Management Company Limited | Households | 2017 |
| Hounds Daycare Ltd | Other services | 2023 |
| House of Ashley (UK) Limited | Professional & scientific | 1990 |
| House of Devine Limited | Other services | 2025 |
| House of Hounds Dog Grooming & Gift Shop Ltd | Wholesale & retail | 2025 |
| Howard Property Management Ltd | Real estate | 2019 |
| Howes Rise (Oakwood) Management Company Limited | Households | 2013 |
| Howper 602 Limited | Professional & scientific | 2006 |
| HPT Socials Ltd | Hospitality | 2025 |
| Hsiyana Ltd | Transport & logistics | 2013 |
| HT Property Group Ltd | Construction | 2020 |
| Hudson Meadows Residents Management Company Limited | Households | 2021 |
| Hughes Property Portfolio Ltd | Real estate | 2026 |
| Hugo Reeves Recruitment Ltd | Administrative & support | 2024 |
| Hurdman Properties Limited | Real estate | 2025 |
| Husaini Healthcare Limited | Health & social care | 2018 |
| Husaini Housing Limited | Real estate | 2019 |
| Hush Health Ltd | Wholesale & retail | 2008 |
| Hussel Properties Ltd | Real estate | 2024 |
| Hussh Health Limited | Wholesale & retail | 2024 |
| Hybrid Manufacturing Technologies Limited | Manufacturing | 2012 |
| Hyde Drylining Limited | Construction | 2025 |
| Hyzen Ltd | Extraterritorial | 2023 |
| I & I Transportation Ltd | Transport & logistics | 2019 |
| I Gough Electrical Limited | Construction | 2015 |
| I H Bhatti Consulting Ltd | Professional & scientific | 2022 |
| I H Marketing Limited | Wholesale & retail | 2017 |
| I Harvey Trading Ltd | Health & social care | 2022 |
| I Need That View Limited | Hospitality | 2023 |
| I2I Technology Solutions Ltd | Professional & scientific | 2024 |
| Iamone Ltd | Professional & scientific | 2016 |
| IAN Dawson (Builders) Limited | Construction | 2002 |
| Ibeams Limited | Manufacturing | 2011 |
| Iberianlink Limited | Wholesale & retail | 2024 |
| Ice Pharma Ltd | Wholesale & retail | 2025 |
| Icrave Desserts T/A Sweet Retreat Limited | Hospitality | 2020 |
| IE Educate Benefits Limited | Information & communication | 2011 |
| Ielb Ltd | Arts & recreation | 2023 |
| Ifor Rhys Limited | Professional & scientific | 2016 |
| IFT Inc Limited | Wholesale & retail | 2023 |
| IG Secure Solutions Limited | Professional & scientific | 2012 |
| IG Surveys Ltd | Professional & scientific | 2019 |
| Ignis Core Technology Limited | Professional & scientific | 2020 |
| Imagine Arts and Minds C.I.C. | Health & social care | 2020 |
| Imagine Inclusion Ltd | Education | 2017 |
| Imprint Events Limited | Professional & scientific | 2023 |
| IN Freight Solutions Limited | Transport & logistics | 2025 |
| IN Full Flow Ltd | Health & social care | 2016 |
| Inclusion Infusion Ltd | Education | 2022 |
| Inclusive Matters Ltd | Education | 2026 |
| Independent Prescribing Ltd | Other services | 2023 |
| Indra Consultants Limited | Professional & scientific | 2025 |
| Industrial Controls and Automation Limited | Manufacturing | 2009 |
| Inetloverly Ltd | Wholesale & retail | 2025 |
| Infospired Limited | Professional & scientific | 2016 |
| Infotech 360 Consulting Limited | Information & communication | 2016 |
| Ingleby View Management Company Limited | Households | 2019 |
| Inhedge 100 Limited | Extraterritorial | 2015 |
| Inhedge 101 Limited | Real estate | 2015 |
| Inhedge 102 Limited | Professional & scientific | 2015 |
| INK Empire Studios Limited | Other services | 2025 |
| INK Pharmaceutical Services Ltd | Manufacturing | 2021 |
| Inner Narratives Ltd | Health & social care | 2024 |
| Innovation Catering (Midlands) Limited | Hospitality | 2019 |
| Innoview Limited | Extraterritorial | 2017 |
| Insane Camel Productions Ltd | Other services | 2019 |
| Insight Co Services Ltd | Administrative & support | 2024 |
| Insofast Limited | Wholesale & retail | 2010 |
| Inspect-Tech Ltd | Professional & scientific | 2022 |
| Inspire Your Stay Ltd | Real estate | 2025 |
| Inspired Serenity Ltd | Hospitality | 2023 |
| Inspiring OT Limited | Health & social care | 2025 |
| Insulation Components Limited | Manufacturing | 1999 |
| Integrex HPC Limited | Information & communication | 2010 |
| Integrex Limited | Manufacturing | 1969 |
| Integrex Technologies Limited | Extraterritorial | 1992 |
| Integritas Financial Planners Ltd | Financial services | 2014 |
| Interior HQ Limited | Wholesale & retail | 2018 |
| Internal Alignment Limited | Professional & scientific | 2012 |
| Invale Limited | Professional & scientific | 1994 |