| HSC Candela Ltd. | Construction | 2008 |
| HT Living Ltd | Real estate | 2026 |
| Hub 32 Ltd | Professional & scientific | 2019 |
| Hub Cars Limited | Professional & scientific | 2021 |
| Hubbard Close Management Limited | Real estate | 2019 |
| Hubbun Limited | Hospitality | 2025 |
| Hudson Investments Limited | Wholesale & retail | 2013 |
| Hudumatek Limited | Construction | 2024 |
| Hues and Tartans Ltd | Professional & scientific | 2024 |
| Hugmas Ltd | Wholesale & retail | 2024 |
| Hugust Consulting Limited | Information & communication | 2025 |
| Humbug Records Limited | Information & communication | 2022 |
| Hummingbird Heating and Logistics Ltd | Construction | 2017 |
| Hundal Trucking Limited | Transport & logistics | 2021 |
| Hunger Busters (Snacpac) Limited | Manufacturing | 2023 |
| Hunter & Lowe Investments LLP | | 2017 |
| Hunter Precision Machining Ltd. | Manufacturing | 1999 |
| Hunton Cafe Limited | Hospitality | 2016 |
| Huntsman Limited | Construction | 2002 |
| Huppers Limited | Information & communication | 2023 |
| Hurst L&M Limited | Real estate | 2025 |
| Husk & Seed Limited | Wholesale & retail | 2018 |
| Hussey College Warri Old Students Association UK Incorporated | Professional & scientific | 2020 |
| Hustlepay Ltd | Information & communication | 2025 |
| Huubie Ltd | Manufacturing | 2021 |
| Huxin Bains Holdings Limited | Real estate | 2023 |
| Hvac Guarantee Ltd | Extraterritorial | 2022 |
| HVN Automation Ltd | Information & communication | 2026 |
| HVP Retail Limited | Wholesale & retail | 2023 |
| Hyde Coffee Ltd | Hospitality | 2024 |
| Hyde Googde Ltd | Hospitality | 2026 |
| Hydra Film Resources Limited | Information & communication | 2024 |
| Hydra Organics Limited | Wholesale & retail | 2020 |
| Hydraulic Solutions (Erith) Limited | Other services | 2000 |
| Hydro Property Services UK Ltd | Professional & scientific | 2024 |
| Hype Lifestyle Ltd | Transport & logistics | 2025 |
| I & S Construction Limited | Construction | 2004 |
| I & S Sandhu Properties Limited | Real estate | 2016 |
| I BIZ Strategies Limited | Information & communication | 2015 |
| I Identify AS Ltd | Wholesale & retail | 2026 |
| I-Centrica Limited | Information & communication | 2015 |
| I.Am Solution Services Ltd | Information & communication | 2025 |
| I.B. Adewale Consultancy Limited | Information & communication | 2016 |
| I.F.G. Estate Ltd | Real estate | 2019 |
| I.M.P.A.C.T Children's Residential Care Ltd | Health & social care | 2020 |
| I.M.P.A.C.T Residential Care Group Limited | Health & social care | 2026 |
| I.M.P.A.C.T Residential Staffing Limited | Health & social care | 2026 |
| I4PERFECTION Limited | Administrative & support | 2011 |
| I8COMPUTER Limited | Information & communication | 2018 |
| IAB Construct Ltd | Construction | 2024 |
| IAB Eyecare Ltd | Health & social care | 2016 |
| IAB Visioncare Ltd | Health & social care | 2010 |
| Iacs Corrosion Engineering Limited | Professional & scientific | 2003 |
| Iangrove Limited | Real estate | 1996 |
| IB Aesthetics Ltd | Other services | 2023 |
| IB General Builders Ltd | Construction | 2023 |
| IB N Offspring Ltd | Real estate | 2026 |
| Ibat Ltd | Information & communication | 2016 |
| IBC Pro Ltd | Wholesale & retail | 2022 |
| Icaz United Kingdom and Ireland Branch | Professional & scientific | 2011 |
| Iccomplished Ltd | Wholesale & retail | 2015 |
| Icdcfy & Repairs Ltd | Construction | 2024 |
| Ice Academy Ltd | Education | 2025 |
| Ice Clear Developments Ltd | Water & waste | 2020 |
| Ice Drainage Ltd | Water & waste | 2023 |
| Ice House Consulting Limited | Professional & scientific | 2011 |
| Ice Media Group Ltd | Professional & scientific | 2024 |
| Ice Play ENT C.I.C. | Education | 2025 |
| Ice Thermal Ltd | Construction | 2020 |
| Icon Builders Ltd | Construction | 2015 |
| Icon Health Limited | Health & social care | 2019 |
| Iconic GAS and Electric Ltd | Construction | 2020 |
| Iconic P.O Consulting Limited | Professional & scientific | 2017 |
| Icrack.Express Ltd | Other services | 2022 |
| ID & T Limited | Financial services | 2009 |
| Idags Limited | Financial services | 2012 |
| Ideaultra Limited | Construction | 1998 |
| Idetail Limited | Wholesale & retail | 2026 |
| IDN Solution Ltd | Water & waste | 2022 |
| Idowu Consulting & Management Ltd | Administrative & support | 2024 |
| Ifytex Ltd | Wholesale & retail | 2025 |
| Igbo Grandma Kitchen Limited | Hospitality | 2024 |
| IGL Corporate Solutions Limited | Professional & scientific | 2023 |
| Igma Imaging Limited | Other services | 2007 |
| Ignat Construction Ltd | Construction | 2025 |
| Igno Tech Ltd | Information & communication | 2025 |
| Iinvent Company Limited | Information & communication | 2011 |
| Iitps Ltd | Information & communication | 2025 |
| IJ Constructions & Services Ltd | Construction | 2026 |
| Ijlpropertymaintenance Limited | Construction | 2021 |
| Ijunkies Limited | Information & communication | 2012 |
| Ikenin UK Limited | Wholesale & retail | 2021 |
| Ikigai Coaching Ltd | Other services | 2026 |
| Ikigai Solvo Ltd | Construction | 2026 |
| Ikit Solutions Ltd | Information & communication | 2018 |
| Ikom Services Ltd | Wholesale & retail | 2024 |
| Ikyenco Investment Ltd | Other services | 2023 |
| ILE Oluwa Ltd | Real estate | 2024 |
| ILE WA II Ltd | Real estate | 2022 |
| ILE WA III Ltd | Real estate | 2022 |