| HO CM Limited | Wholesale & retail | 2025 |
| Hockley Properties Limited | Real estate | 2023 |
| Hogarth Estates Limited | Other services | 2018 |
| Hollybush Corner Ltd | Construction | 2021 |
| Holmes Electrical Contractors Ltd | Construction | 2012 |
| Home Place Support CIC | Hospitality | 2025 |
| Homely Housing Limited | Health & social care | 2020 |
| Homes 2 Inspire Limited | Health & social care | 2017 |
| Homes in Hearts Limited | Health & social care | 2018 |
| HOMES2INSPIRE Services Limited | Professional & scientific | 2024 |
| Honey Sweet Factory Ltd | Wholesale & retail | 2024 |
| Hood Pride Mechanics Ltd | Wholesale & retail | 2024 |
| Hooper a Limited | Wholesale & retail | 2026 |
| Hoopskills Ltd | Arts & recreation | 2009 |
| Hope Cove (South Hams) Limited | Transport & logistics | 2019 |
| Horsepower Performance Ltd | Manufacturing | 2025 |
| Horton J Limited | Wholesale & retail | 2025 |
| Hotel Birmingham Ltd | Hospitality | 2013 |
| Hotstart Birmingham Holdings Limited | Financial services | 2018 |
| Hotstart Birmingham Limited | Manufacturing | 2018 |
| House of Spices Kitchen Ltd | Hospitality | 2023 |
| HOW Green Energy Limited | Construction | 2024 |
| Howson 1 Ltd | Arts & recreation | 2026 |
| HR02 Construction Limited | Construction | 2025 |
| HRG Property Real Estates Limited | Real estate | 2025 |
| HRN Vision & Co Limited | Real estate | 2024 |
| HS Brothers Limited | Manufacturing | 2019 |
| Hsaz Trading Ltd | Manufacturing | 2017 |
| HSH Developments Limited | Construction | 2018 |
| HSP Transport Limited | Transport & logistics | 2018 |
| HSS Consultancy Limited | Administrative & support | 2017 |
| HSS Design & Build Ltd | Construction | 2025 |
| HSS Trading Stores Ltd | Wholesale & retail | 2023 |
| Hubbl Marketing Limited | Professional & scientific | 2019 |
| Hungary Trans Ltd | Transport & logistics | 2026 |
| Hungry’S Cafe Limited | Hospitality | 2025 |
| Hunt Steel Construction Ltd | Construction | 2021 |
| Huntsman Cocktail Bar Limited | Hospitality | 2023 |
| HUS Locums Ltd | Health & social care | 2011 |
| Hush Bedrooms Limited | Wholesale & retail | 2013 |
| Hutrade Ltd. | Manufacturing | 2013 |
| Hyde M Limited | Wholesale & retail | 2016 |
| I & a & M Ltd | Transport & logistics | 2019 |
| I & RIZ Properties Ltd | Real estate | 2024 |
| I K Motors Limited | Wholesale & retail | 2024 |
| IAA Solutions Limited | Information & communication | 2014 |
| Iamquality Services Ltd | Professional & scientific | 2023 |
| ICC Hand Car Wash Limited | Wholesale & retail | 2013 |
| Ice'N'Creamuk Ltd | Wholesale & retail | 2025 |
| Icon Beauty Ltd | Extraterritorial | 2024 |
| Icon SI (AU) PTY Ltd | Construction | 2024 |
| ICT Protect Limited | Information & communication | 2021 |
| Ideal Homes Orangeries and Conservatories Ltd | Construction | 2017 |
| Idika Groups UK Ltd | Transport & logistics | 2024 |
| Ielectrical Contractors Ltd | Professional & scientific | 2014 |
| Igennix Limited | Education | 2010 |
| Igors Mazjanis Limited | Transport & logistics | 2014 |
| Igovegan Ltd | Hospitality | 2020 |
| IKB Foods Limited | Manufacturing | 2024 |
| Illumimaths Consultancy Ltd | Education | 2019 |
| Ilyas ALI Hussain Solutions Ltd | Transport & logistics | 2025 |
| Imaan Health Ltd | Health & social care | 2022 |
| Immaculate Home Cleaning Limited | Extraterritorial | 2006 |
| Immortalway Ltd | Construction | 2025 |
| Impact Construction Management Limited | Construction | 2019 |
| Impact Facilities Management Holdings Limited | Financial services | 2021 |
| Impact Facilities Management Limited | Construction | 2006 |
| Impact Learning & Performance Limited | Professional & scientific | 2025 |
| Imperial Garages Ltd | Financial services | 2024 |
| Imperial Lettings Ltd | Real estate | 2008 |
| Imperial Shipping Specialist Ltd | Transport & logistics | 2022 |
| Imperium Performance Limited | Wholesale & retail | 2026 |
| IN Pursuit Daily Ltd | Information & communication | 2020 |
| In-Exhale Ltd | Other services | 2020 |
| Inaya Flow Limited | Information & communication | 2026 |
| Incline Services Ltd | Health & social care | 2018 |
| Incorporatewear Limited | Wholesale & retail | 1996 |
| Independent Stockholders Ltd | Wholesale & retail | 2023 |
| Indian & Afghan Restaurant Ltd | Hospitality | 2025 |
| Industrial Chiller Direct Ltd | Professional & scientific | 2026 |
| Indy Builders Ltd | Construction | 2026 |
| Ineza Diagnostic Ltd | Health & social care | 2021 |
| Infinite Potential Consultancy Ltd | Professional & scientific | 2025 |
| Infinitive Distributions Limited | Wholesale & retail | 2013 |
| Infinity Learning Services Limited | Education | 2023 |
| Initial Mixing Solutions Ltd | Manufacturing | 2004 |
| Innovasys Tech Limited | Information & communication | 2025 |
| Innovate EA Ltd | Real estate | 2012 |
| Inoway Limited | Transport & logistics | 2025 |
| Inspired by Isaiah Ltd | Administrative & support | 2025 |
| Instafinance Limited | Financial services | 2024 |
| Instahold Limited | Financial services | 2024 |
| Instill AI Ltd | Information & communication | 2020 |
| Intelispectrum Ltd | Information & communication | 2025 |
| Intense Care Limited | Health & social care | 2017 |
| INTERCLOUD9 Ltd | Wholesale & retail | 2017 |
| Interlube UK Limited | Manufacturing | 1988 |
| Internet Archive UK | Administrative & support | 2013 |
| Intori Ltd | Wholesale & retail | 2021 |
| Investern Limited | Financial services | 2019 |