| Hummingbird Bridge Limited | Administrative & support | 2021 |
| Hunt's Web Design Ltd | Professional & scientific | 2025 |
| Hunter Davies Limited | Wholesale & retail | 2022 |
| Hunter Estates Ltd | Real estate | 2025 |
| Hunter Morgan Intergalactic Ltd | Real estate | 2019 |
| Hunter Morgan Orbital Limited | Real estate | 2020 |
| Hunter Services (GB) Ltd | Other services | 2007 |
| Huntic Tech Ltd | Administrative & support | 2016 |
| Huntick Consulting Limited | Information & communication | 2016 |
| Huntick Farm Caravans Ltd | Hospitality | 2016 |
| Huntick Green Management Company Limited | Households | 2020 |
| Huntick Limited | Real estate | 2019 |
| Huntick Properties Ltd | Construction | 2020 |
| Hupaku Ltd | Other services | 2018 |
| Hupi Limited | Wholesale & retail | 2025 |
| Hurn Quality Consulting Ltd | Professional & scientific | 2016 |
| Hurricane Hosting Ltd | Information & communication | 2021 |
| Hurst Roofing Limited | Construction | 2025 |
| Hurtwood Press Ltd | Other services | 1978 |
| Huslers Inc Ltd. | Manufacturing | 2021 |
| Husmus Ltd | Information & communication | 2018 |
| Hutcho Ltd | Information & communication | 2026 |
| HVC Holdings Limited | Professional & scientific | 2024 |
| Hyacinth E. Performers Ltd | Education | 2025 |
| Hybrid BJJ Ltd | Arts & recreation | 2024 |
| Hydee Limited | Wholesale & retail | 2025 |
| Hydreco Hydraulics Limited | Manufacturing | 2008 |
| Hydro Rinse Ltd | Administrative & support | 2026 |
| Hygenex Ltd | Manufacturing | 2020 |
| Hygge Nutrition Ltd | Manufacturing | 2025 |
| Hygiene Bargains 2025 Ltd | Wholesale & retail | 2025 |
| Hygienic Wall Systems Limited | Construction | 1995 |
| Hyper Gaming Limited | Wholesale & retail | 2023 |
| Hyperika Ltd | Information & communication | 2025 |
| Hyperion Software Systems Limited | Information & communication | 2024 |
| Hyperjet Ltd | Manufacturing | 2021 |
| Hyperty Property Limited | Real estate | 2019 |
| Hypr Limited | Information & communication | 2017 |
| Hyrst Garth Estate Limited | Real estate | 1955 |
| Hysova Limited | Wholesale & retail | 2025 |
| Hythe END Road Estate Limited | Households | 2012 |
| I & H Properties Limited | Real estate | 2019 |
| I AM Darko Ltd | Wholesale & retail | 2018 |
| I C B (Projects) Limited | Construction | 2008 |
| I C L Hogg Ltd | Construction | 2020 |
| I GOT YOU Fixed Ltd | Other services | 2014 |
| I Need a PA Ltd | Administrative & support | 2023 |
| I Will Byte YOU Ltd | Information & communication | 2021 |
| I-Psycle Limited | Wholesale & retail | 2018 |
| I-Zenith Ltd | Health & social care | 2024 |
| I.C.B. (Fabrications) Limited | Construction | 2008 |
| I.Lines Marine Services Ltd | Manufacturing | 2020 |
| I247 Holdings Limited | Financial services | 2025 |
| I2G Ltd | Arts & recreation | 2025 |
| IA IT Consulting Limited | Information & communication | 2014 |
| Iain Percy Consulting Limited | Arts & recreation | 2018 |
| Iamdigimom Ltd | Wholesale & retail | 2025 |
| IAN Finch Plumbing and Heating Limited | Construction | 2010 |
| IAN Richardson Ltd | Financial services | 2020 |
| IAN Simpson Consultancy Ltd | Professional & scientific | 2016 |
| IBA Investment Holdings Limited | Financial services | 2025 |
| Ibalance Limited | Administrative & support | 1997 |
| IBC Capital Partners Ltd | Financial services | 2025 |
| Ibericauk Ltd | Wholesale & retail | 2014 |
| Ibex Components Ltd | Wholesale & retail | 2025 |
| Ibmt Ltd | Wholesale & retail | 2024 |
| Ibrahype Ltd | Wholesale & retail | 2024 |
| ICA Network Solutions LLP | | 2006 |
| ICB (Trading) Limited | Financial services | 2016 |
| ICB (Waterproofing) Ltd | Construction | 1985 |
| ICC Car Park Ltd | Wholesale & retail | 2024 |
| Icce Carwash Ltd | Wholesale & retail | 2018 |
| Ice House Funding Limited | Administrative & support | 2020 |
| Iceblink Ltd | Information & communication | 2021 |
| ICF Builder Ltd | Construction | 2020 |
| ICK Studio Ltd | Wholesale & retail | 2024 |
| ICK. Holding Ltd | Financial services | 2024 |
| Icky Ltd | Information & communication | 2022 |
| ICN Energy Limited | Manufacturing | 2014 |
| Icon Classic Car (Hire and Sales) Ltd | Wholesale & retail | 2012 |
| Icon Digital Serv Limited | Wholesale & retail | 2025 |
| Icon Motorhomes Ltd | Wholesale & retail | 2022 |
| Icon Software Limited | Information & communication | 2009 |
| Iconic Corporation Ltd | Wholesale & retail | 2025 |
| Ideal Energy NOW Ltd | Construction | 2011 |
| Ideal Solar NOW Ltd | Construction | 2011 |
| Ideal Warmth Ltd | Construction | 2014 |
| Ideaspace Studios Ltd | Information & communication | 2022 |
| Identity Square Limited | Information & communication | 2021 |
| IDR Estates Ltd | Real estate | 2018 |
| IEC Limited | Wholesale & retail | 1985 |
| IEC Trustees Limited | Professional & scientific | 2026 |
| IEG Sports Consultancy Ltd | Information & communication | 2013 |
| IES Transform Ltd | Information & communication | 2026 |
| Ietrx Ltd | Wholesale & retail | 2024 |
| IF Design Specialists Limited | Professional & scientific | 2021 |
| IFA Advice Ltd | Financial services | 2024 |
| Ifco Limited | Professional & scientific | 2026 |
| Iffy and Ixie Limited | Financial services | 2014 |
| IFIXIT4U Ltd | Information & communication | 2019 |