| House 99 Limited | Hospitality | 2024 |
| House Coffee Ltd | Wholesale & retail | 2020 |
| House ME Freeholds Ltd | Real estate | 2025 |
| House ME Solutions Ltd | Real estate | 2018 |
| House of JAX Ltd | Information & communication | 2024 |
| Housetrax Records Ltd | Information & communication | 2025 |
| Howard Family Developments Ltd | Hospitality | 2025 |
| Hozan 17 Limited | Wholesale & retail | 2025 |
| Hozfoods Limited | Wholesale & retail | 2024 |
| Hp-Carbon Ltd | Wholesale & retail | 2021 |
| HS Civils Ltd | Construction | 2023 |
| Hsbp Investments Limited | Financial services | 2013 |
| Htwn Limited | Hospitality | 2015 |
| HUB55 Properties Ltd | Real estate | 2023 |
| Hudswell Clarke Locomotives Limited | Extraterritorial | 2004 |
| Hughes Financial Planning Ltd | Financial services | 2025 |
| Hughes Hideaways Ltd. | Real estate | 2025 |
| Hula Girls Limited | Wholesale & retail | 2020 |
| Hull Safe Surveys Ltd | Professional & scientific | 2026 |
| Hulland Textiles Limited | Manufacturing | 2025 |
| Humana Promotions Limited | Arts & recreation | 2025 |
| Humongous Hospitality Ltd | Hospitality | 2021 |
| Humphries Company Limited | Real estate | 2024 |
| Humphries Investments Limited | Wholesale & retail | 2019 |
| Huneo Partners Limited | Administrative & support | 2026 |
| Hunnybeez Farm Ltd | Agriculture & fishing | 2020 |
| Hunter Dunn Ltd | Construction | 2014 |
| Hurley Inns Limited | Hospitality | 2016 |
| Hurricane Home Improvements Ltd | Construction | 2022 |
| Hussain Orthopaedics Ltd | Health & social care | 2022 |
| Huttch Ltd | Manufacturing | 2020 |
| HWT Mechanical Services Ltd | Manufacturing | 2026 |
| HX1 Fitness Limited | Arts & recreation | 2023 |
| Hybrid Strength & Striking Ltd | Arts & recreation | 2026 |
| Hybrid Structures Limited | Professional & scientific | 2015 |
| Hyde Enterprise Marque Limited | Information & communication | 1997 |
| Hydrajaws (US) Limited | Manufacturing | 2016 |
| Hydrajaws Holdings Limited | Manufacturing | 2011 |
| Hydrajaws Limited | Manufacturing | 1988 |
| Hydrajaws Safety Products Limited | Manufacturing | 2025 |
| Hydro Mechanical Systems Ltd | Professional & scientific | 2001 |
| Hydro Solutions Water Treatment Limited | Water & waste | 2016 |
| Hyland Electrical Ltd | Construction | 2012 |
| Hyldene Services Limited | Professional & scientific | 2011 |
| Hypertech Link Ltd | Wholesale & retail | 2026 |
| I G Installations Midlands Limited | Construction | 2015 |
| I P 24 Limited | Administrative & support | 2013 |
| I P Laker Financial Ltd | Financial services | 2019 |
| I-Non-C Consulting Limited | Information & communication | 2008 |
| Iain James TM Ltd | Professional & scientific | 2016 |
| IAN Glover Tractor Spares Limited | Wholesale & retail | 2006 |
| IAS Academy and Labs Limited | Health & social care | 2005 |
| IAS LAB Limited | Extraterritorial | 2016 |
| IAS Ortho Ltd | Professional & scientific | 2016 |
| Ibex Grips Ltd | Extraterritorial | 2023 |
| IBJ Services (Walsall) Limited | Wholesale & retail | 2012 |
| Ibraheem & Arslan Ltd | Wholesale & retail | 2026 |
| Ice AC Ltd | Construction | 2014 |
| Icmi Associates Limited | Professional & scientific | 2015 |
| Icol-Consultants Ltd. | Other services | 2015 |
| Iconic Campers Limited | Wholesale & retail | 2020 |
| Idabelle Aesthetics Ltd | Other services | 2025 |
| Ideal Bathrooms and Home Improvements Ltd | Construction | 2025 |
| Ideas Curated Ltd | Information & communication | 2016 |
| IDL Star Ltd | Professional & scientific | 2024 |
| IDO Vehicle Solutions Limited | Wholesale & retail | 2019 |
| Idol Club Ltd | Wholesale & retail | 2024 |
| IE Billingham Works Ltd | Energy | 2025 |
| IE Eggborough Station Ltd | Energy | 2025 |
| IET Automation Limited | Professional & scientific | 2026 |
| Ifayolu Global Ltd | Information & communication | 2025 |
| Iggy Ketley Holdings Limited | Financial services | 2026 |
| IGL Installs Ltd | Construction | 2026 |
| Ignite Activities Ltd | Arts & recreation | 2018 |
| IGT Creative Ltd | Manufacturing | 2023 |
| IH Automation Ltd | Administrative & support | 2014 |
| IJK Couriers Limited | Transport & logistics | 2008 |
| Ilaria Limited | Information & communication | 2018 |
| Ilgamos (Midlands) Ltd | Administrative & support | 2016 |
| Ilie Tundrea Ltd | Transport & logistics | 2018 |
| Illuminaire Displays Limited | Manufacturing | 2002 |
| Illuminati Group Ltd | Administrative & support | 2020 |
| Ilyan UK Ltd | Information & communication | 2012 |
| Ilze Reinke Interiors Ltd | Professional & scientific | 2015 |
| IM Electrical Contractors Ltd | Construction | 2025 |
| IMA Group Holdings Limited | Financial services | 2023 |
| Image Red Media Limited | Information & communication | 2013 |
| Imasco Limited | Administrative & support | 2003 |
| Imat Limited | Manufacturing | 2004 |
| IMG Automotive Ltd. | Extraterritorial | 2009 |
| IMG Distributors Limited | Wholesale & retail | 1995 |
| IMG Telesales Limited | Extraterritorial | 2006 |
| Immersion Heaters UK Ltd | Wholesale & retail | 2021 |
| Immortal MMA Ltd | Arts & recreation | 2024 |
| Impact Kids UK Limited | Professional & scientific | 2020 |
| Impact Windscreens Ltd | Wholesale & retail | 2011 |
| Imparable Ltd | Administrative & support | 2024 |
| Imperator Energy Limited | Professional & scientific | 2024 |
| Imperial Vehicle Movements Limited | Transport & logistics | 2019 |
| Imperium Edge Limited | Professional & scientific | 2018 |