| Health Abundance Limited | Public administration | 2022 |
| Healthcare Service Plus Ltd | Health & social care | 2022 |
| HEALTHPRODUCTS4U Limited | Wholesale & retail | 2023 |
| Heartlands Facilities Management Ltd | Administrative & support | 2017 |
| Heer Brick & Block Work Ltd | Construction | 2025 |
| Heera Contractors Ltd | Construction | 2023 |
| Hello Orders Ltd | Other services | 2021 |
| Henry Security Services Ltd | Professional & scientific | 2020 |
| Henryk Limited | Transport & logistics | 2011 |
| Hermitage Property Investments Ltd | Real estate | 2026 |
| Heyman Food Ltd | Wholesale & retail | 2025 |
| HG Services & Deco Ltd | Construction | 2021 |
| HGV Pitstop Ltd | Transport & logistics | 2026 |
| HI Tech Repairs Ltd | Wholesale & retail | 2026 |
| Higgs Commercials Ltd | Administrative & support | 2019 |
| High Tensile Bolts Limited | Wholesale & retail | 1967 |
| Highbury Luggage Ltd | Administrative & support | 2018 |
| Hightech Midlands Limited | Real estate | 2018 |
| Hill Stanton Limited | Professional & scientific | 2013 |
| Hippotms Ltd | Professional & scientific | 2023 |
| HMO Daddy Limited | Education | 2008 |
| HMO Daddy Projects Limited | Real estate | 2012 |
| Holders Builders Ltd | Construction | 2023 |
| Hollen Engineering Ltd | Construction | 2012 |
| Holls Property Ltd | Construction | 2026 |
| Homeptinstructor Ltd | Arts & recreation | 2025 |
| Hot Crusty Pizza Ltd | Hospitality | 2025 |
| Houses Hub Ltd | Real estate | 2024 |
| Howling Cactus Limited | Professional & scientific | 2026 |
| Hoylake Brickwork Contractors Limited | Construction | 2024 |
| HSA Hardware Ltd | Wholesale & retail | 2021 |
| HSB Healthcare Ltd | Wholesale & retail | 2025 |
| HSB Ventures Limited | Financial services | 2025 |
| HSK Healthcare Ltd | Health & social care | 2016 |
| HSM Comms Ltd | Information & communication | 2023 |
| Hukum Transport Limited | Transport & logistics | 2025 |
| HUM Events UK Ltd | Arts & recreation | 2025 |
| Humbleness Cleaning Service Limited | Administrative & support | 2025 |
| Humphries Demolition Limited | Construction | 1997 |
| Huntley Refrigeration Limited | Manufacturing | 2009 |
| Hussain Medic Ltd | Health & social care | 2021 |
| Hussan Engineering Limited | Professional & scientific | 2025 |
| HVA Holdings Limited | Financial services | 2021 |
| HWD Properties Limited | Real estate | 2025 |
| Hydrobolt (Holdings) Limited | Manufacturing | 2003 |
| Hydrobolt EBT Limited | Financial services | 2011 |
| Hydrobolt Group Limited | Manufacturing | 2005 |
| Hygia Wellness Ltd | Arts & recreation | 2024 |
| Häuser Furniture Ltd | Wholesale & retail | 2025 |
| I & C GAS Services Ltd | Construction | 2012 |
| I & C GS Group Limited | Financial services | 2020 |
| IAN Mclean Limited | Construction | 2007 |
| IB Roofing (UK) Ltd | Construction | 2024 |
| ICC Builders Ltd | Construction | 2023 |
| ICH Auto Services Ltd | Wholesale & retail | 2018 |
| IDC Fabrication Ltd | Manufacturing | 2023 |
| Ideal Brows Ltd | Other services | 2025 |
| Ideal Threading Ltd | Other services | 2025 |
| Idealguard Limited | Wholesale & retail | 2022 |
| Ign(West Midlands) Limited | Wholesale & retail | 2017 |
| Ignite Health and Home Care Services Ltd | Health & social care | 2010 |
| IL Peccato Limited | Wholesale & retail | 2020 |
| IM Drinkin RUM Ltd | Wholesale & retail | 2022 |
| IMG Barrett Limited | Wholesale & retail | 2025 |
| Immigration Justice Solicitors Ltd | Other services | 2015 |
| Impact Precision Manufacturing Limited | Manufacturing | 2001 |
| IN a Flash Limited | Health & social care | 2018 |
| Inchcade Limited | Manufacturing | 2022 |
| Inder Carriers Ltd | Transport & logistics | 2017 |
| Indigo Art Gallery Ltd | Wholesale & retail | 2018 |
| Industrial Metal Finishers Limited | Administrative & support | 2003 |
| Industrial Weighing Scales Ltd | Manufacturing | 2022 |
| Inkside Ltd | Arts & recreation | 2015 |
| Inner Hub Ltd | Other services | 2025 |
| Inteb Limited | Wholesale & retail | 1982 |
| Intense Milk Limited | Hospitality | 2017 |
| Interchange Transport Limited | Transport & logistics | 2020 |
| Interiors Direct Contracts Ltd | Construction | 2015 |
| Interiors Direct Limited | Construction | 2009 |
| Interiors Direct NC Access Scaffold Solutions Ltd | Construction | 2018 |
| International 1 Minimarket Ltd | Other services | 2024 |
| International Massage Academy Ltd. | Extraterritorial | 2014 |
| International Street Evangelism Ministries | Other services | 2021 |
| Investmentsaver Limited | Manufacturing | 2025 |
| Inviz Ltd | Professional & scientific | 2024 |
| Ionut-Adrian NAE Ltd | Transport & logistics | 2021 |
| IRS Fabrication Limited | Manufacturing | 2022 |
| Is-Net (International Student Network) Ltd | Administrative & support | 2022 |
| Is-Net Ltd | Information & communication | 2013 |
| Isha Property Ltd | Real estate | 2023 |
| Isis Limited | Information & communication | 1981 |
| Island Lounge and Bytes Ltd | Hospitality | 2023 |
| Itona Aviation Services Limited | Manufacturing | 2019 |
| Iulian Van Transport Ltd | Transport & logistics | 2019 |
| Ivans Services Ltd | Transport & logistics | 2016 |
| Iyawe Ltd | Real estate | 2026 |
| IZY Deli Food Ltd | Manufacturing | 2023 |
| J & J Residential Limited | Real estate | 2017 |
| J a Corrigan Hydraulic Services Ltd | Manufacturing | 2022 |
| J Bradley Services Ltd | Manufacturing | 2012 |