| Horizon Scitech Limited | Professional & scientific | 2015 |
| Horne Investments Ltd | Real estate | 2024 |
| Horner & Hudsons Limited | Wholesale & retail | 2010 |
| Horner's JAG Solutions Ltd | Wholesale & retail | 2024 |
| Horseshoe Drive (Macclesfield) Management Company Ltd | Extraterritorial | 2008 |
| Horsfield Projects Limited | Construction | 2020 |
| Hospice Quality Partnership Ltd. | Administrative & support | 2014 |
| Hot Floors Underfloor Heating Ltd | Wholesale & retail | 2010 |
| House About This? Ltd | Real estate | 2021 |
| House Cookies Ltd | Real estate | 2023 |
| Housemates (Macclesfield) Limited | Real estate | 1961 |
| Housing Ladder (Warrington) Ltd | Administrative & support | 2010 |
| Hrnet Ltd | Administrative & support | 2019 |
| HS Leisure Group Ltd | Professional & scientific | 2026 |
| Hsye Limited | Hospitality | 2023 |
| HT Heating Ltd | Construction | 2025 |
| Htce Properties Ltd | Real estate | 2025 |
| Hub Creative Services Ltd | Professional & scientific | 2019 |
| Hulley Road MOT & Service Centre Limited | Wholesale & retail | 2009 |
| Hulme Accountants Limited | Professional & scientific | 2025 |
| Hulme Properties Limited | Real estate | 2016 |
| Human MED UK Limited | Manufacturing | 2012 |
| Hunnybuns Ltd | Wholesale & retail | 2018 |
| Hunter & Belle Limited | Professional & scientific | 2013 |
| Hunter Moon Developments Ltd | Construction | 2026 |
| Hunter Property Group Ltd | Real estate | 2026 |
| Huntingdon House Freehold Limited | Real estate | 2025 |
| Huntingdon House RTM Company Limited | Households | 2023 |
| Huntsman Bespoke Limited | Wholesale & retail | 2023 |
| Huntsmere Contracts Limited | Construction | 2010 |
| Huntsmere Limited | Construction | 2003 |
| Hurcott Developments Limited | Extraterritorial | 1979 |
| Hurdsfield Launderette and DRY Cleaners Ltd | Other services | 2020 |
| Hurdsfield Road Management Company Limited | Households | 2004 |
| Huruma KWA Mwili Yako Ltd | Education | 2024 |
| Hussain Group Limited | Wholesale & retail | 2019 |
| Hutch Property Limited | Real estate | 2020 |
| Huthwaite Homes Ltd | Real estate | 2024 |
| Hybrid Compute Solutions Ltd | Information & communication | 2024 |
| Hybrid Scooter Technologies Ltd | Wholesale & retail | 2017 |
| Hydeout Properties Ltd | Real estate | 2024 |
| Hydraulic Authority I Limited | Financial services | 2018 |
| Hydraulic Authority II Limited | Financial services | 2018 |
| Hydraulic Authority III Limited | Financial services | 2018 |
| Hydroclay Limited | Agriculture & fishing | 2018 |
| Hygienics Consulting Ltd | Professional & scientific | 2020 |
| Hykes Clothing Ltd | Wholesale & retail | 2023 |
| Hymor Timber Limited | Wholesale & retail | 2026 |
| HZMS3 Ltd | Real estate | 2025 |
| I & P L Limited | Professional & scientific | 2023 |
| I AM Print Limited | Manufacturing | 2012 |
| I Could Lose My JOB Ltd | Wholesale & retail | 2023 |
| I D Motors Macclesfield Limited | Wholesale & retail | 2018 |
| I Heart Ugly Boys Limited | Professional & scientific | 2025 |
| I Mason Property Management Ltd | Real estate | 2024 |
| I T G Ltd | Other services | 2003 |
| I-Business FLO Limited | Professional & scientific | 2012 |
| I. Brownlee Stamps Limited | Wholesale & retail | 1978 |
| I2I Design Limited | Information & communication | 2009 |
| Iambob Ltd | Information & communication | 2024 |
| IAN Ankers Architecture Limited | Professional & scientific | 2011 |
| IAN Blackwell Consulting Limited | Professional & scientific | 2026 |
| IAN Edgar(Liverpool)Limited | Wholesale & retail | 1957 |
| IAN Mann & SON Funeral Directors Limited | Other services | 2000 |
| Iaviz Stewards Ltd | Education | 2024 |
| IB Digital Consultancy Limited | Professional & scientific | 2025 |
| Ibex Gold Limited | Manufacturing | 2007 |
| Ibii Ltd. | Wholesale & retail | 2016 |
| IC Cubed (UK) Limited | Professional & scientific | 2013 |
| ICA Capital Investments Ltd | Financial services | 2018 |
| Ice Roll Pro Limited | Wholesale & retail | 2018 |
| Ice-Berg Building Physics Ltd | Professional & scientific | 2020 |
| Icns Global Ltd | Financial services | 2021 |
| Icon (MCR) Limited | Real estate | 2008 |
| Icspace Ltd | Construction | 2020 |
| IDA Medical Communications Ltd | Professional & scientific | 2025 |
| Idea Farm Limited | Information & communication | 2009 |
| Ideate Digital Ltd | Professional & scientific | 2020 |
| Iduron Limited | Manufacturing | 2005 |
| IE (Peaky Blinders) Limited | Arts & recreation | 2021 |
| IE (Peppa PIG) Limited | Arts & recreation | 2021 |
| IE (Traitors Live Experience) Limited | Arts & recreation | 2023 |
| Ifinance ABL Ltd | Financial services | 2025 |
| Ifinance Credit Ltd | Financial services | 2025 |
| Ifinance Group Ltd | Financial services | 2025 |
| Ifinance Ltd | Financial services | 2025 |
| Ifinance Trading Ltd | Financial services | 2025 |
| IG & L Investments Ltd | Extraterritorial | 2011 |
| Igrowing Limited | Manufacturing | 2019 |
| Ikarus Pattern Limited | Professional & scientific | 2023 |
| Ikkuna Solutions Limited | Information & communication | 2016 |
| Ikoncierge Limited | Other services | 2022 |
| Illustrated London News Limited | Administrative & support | 2024 |
| Imac Technical Services Limited | Professional & scientific | 2003 |
| Imac-Repairs Ltd | Other services | 2017 |
| Image Foundry Studios Limited | Information & communication | 2004 |
| Imatta Junior Ltd | Health & social care | 2026 |
| IMG Solutions Ltd | Professional & scientific | 2014 |
| Immersive Everywhere (Doctor WHO UK) Limited | Arts & recreation | 2019 |
| Immersive Everywhere Ltd | Arts & recreation | 2024 |