| Hyland Mews Clifton Limited | Real estate | 2026 |
| Hyland Property Services Limited | Real estate | 2018 |
| Hyland Technology Group Ltd | Professional & scientific | 2020 |
| Hylton Photography Limited | Professional & scientific | 2005 |
| HYN Electrical Limited | Construction | 2026 |
| Hynco Ltd | Construction | 2014 |
| Hynd Site Ltd | Information & communication | 2022 |
| Hype Motorsport Limited | Arts & recreation | 2015 |
| Hype Properties Limited | Real estate | 2022 |
| Hyper Casino Ltd | Information & communication | 2025 |
| Hyper Virtual Ltd | Administrative & support | 2016 |
| Hyperact Ltd | Information & communication | 2022 |
| Hyperbadge Ltd | Information & communication | 2025 |
| Hyperbikes Ltd | Wholesale & retail | 2020 |
| Hyperfocused on Health Limited | Health & social care | 2025 |
| Hyperlabour Ltd | Wholesale & retail | 2020 |
| Hyperrealish Ltd | Information & communication | 2025 |
| Hyperslice Ltd | Information & communication | 2012 |
| Hypersport Ltd | Wholesale & retail | 2013 |
| Hypha Communications Ltd | Professional & scientific | 2022 |
| Hyphen Noor Ltd | Professional & scientific | 2019 |
| Hypnotherapy Matters Leeds Ltd | Administrative & support | 2015 |
| Hyson Technologies Ltd | Information & communication | 2025 |
| Hytal Kitchens & Bedrooms Limited | Manufacturing | 2004 |
| Hytech Glass Liverpool Limited | Manufacturing | 2023 |
| Hyve Living Ltd | Construction | 2024 |
| HZ Holdings Ltd | Real estate | 2025 |
| Hzcore Technologies Limited | Information & communication | 2026 |
| HZK Limited | Hospitality | 2012 |
| Hzonecladd Limited | Construction | 2026 |
| HZS Accountants Ltd | Professional & scientific | 2015 |
| Hzss Property Ltd | Real estate | 2025 |
| I & a Jehangiri Ltd | Real estate | 2018 |
| I & L Properties (NW) Limited | Real estate | 2024 |
| I & M Building Services Ltd | Construction | 2026 |
| I & M Electrical Limited | Construction | 2017 |
| I a P Investments Ltd | Financial services | 2016 |
| I Accountancy Services Ltd | Administrative & support | 2017 |
| I AM Audio I Limited | Professional & scientific | 2013 |
| I AM Muscle Ltd | Wholesale & retail | 2019 |
| I C S Consulting Limited | Professional & scientific | 2000 |
| I Consult (Yorkshire) Limited | Professional & scientific | 2012 |
| I Credit Management Ltd | Administrative & support | 2016 |
| I Cutie Limited | Arts & recreation | 2026 |
| I D Planning Holdings Limited | Professional & scientific | 2025 |
| I Fusion Ltd | Hospitality | 2024 |
| I G Sealed Units Limited | Manufacturing | 1995 |
| I GOT Food, Babe Ltd. | Manufacturing | 2016 |
| I H Gurnett Limited | Professional & scientific | 2010 |
| I Handley-Allen Ltd | Professional & scientific | 2026 |
| I I G (GB) Limited | Financial services | 2007 |
| I J Duckworth Properties Ltd | Real estate | 2025 |
| I Javed Properties Limited | Real estate | 2019 |
| I Just Want an App Ltd | Information & communication | 2018 |
| I L Trading Limited | Transport & logistics | 2015 |
| I M Capital Ltd | Financial services | 2022 |
| I M Clinic Limited | Other services | 2025 |
| I M F ( P C R ) Limited | Manufacturing | 2003 |
| I Mantovani Limited | Hospitality | 2026 |
| I Matter Ltd | Manufacturing | 2026 |
| I on Cctv Ltd | Wholesale & retail | 2024 |
| I P Sneddon Geotechnical Services Ltd | Construction | 2006 |
| I R Consultants Yorkshire Ltd | Professional & scientific | 2013 |
| I Richardson Property Maintenance Limited | Construction | 2014 |
| I Rothera Limited | Construction | 2024 |
| I S Developments (UK) Limited | Real estate | 2013 |
| I S EYE Ltd | Health & social care | 2014 |
| I Salon Limited | Other services | 2018 |
| I Sense Solutions Ltd | Information & communication | 2017 |
| I Sparkle Cleaning Solutions Ltd | Administrative & support | 2025 |
| I Used to BE LP | | 2021 |
| I Vape Leeds Ltd | Wholesale & retail | 2026 |
| I Vijay Ltd | Transport & logistics | 2022 |
| I Will Buy Anything Ltd | Wholesale & retail | 2025 |
| I&B Properties Ltd | Real estate | 2019 |
| I&S Marketing Ltd | Professional & scientific | 2019 |
| I-Car Hire Limited | Administrative & support | 2016 |
| I-Edge Limited | Professional & scientific | 2004 |
| I-Klean Services Ltd | Administrative & support | 2025 |
| I-Plumb.Com Ltd | Construction | 2008 |
| I-Power Ltd | Administrative & support | 2024 |
| I-Security Services (I-Sec) Ltd | Administrative & support | 2022 |
| I-Security Solutions Ltd | Administrative & support | 2013 |
| I-Smt-Ology Limited | Professional & scientific | 2019 |
| I-Spy Optical Ltd | Health & social care | 2012 |
| I-View Leeds Limited | Professional & scientific | 2018 |
| I.A. Design Limited | Construction | 1996 |
| I.A.S Cleaning Limited | Wholesale & retail | 2016 |
| I.C.E Property & Solutions Ltd | Real estate | 2024 |
| I.C.R.E.S. Limited | Professional & scientific | 2025 |
| I.D.M Sales Ltd | Wholesale & retail | 2024 |
| I.G.G. Transport Ltd | Transport & logistics | 2024 |
| I.G.Jukes & Co.Limited | Financial services | 1963 |
| I.J.R. Investments Limited | Real estate | 2002 |
| I.L.S. Construction Ltd | Construction | 2010 |
| I.M. NO. 10 Limited. | Extraterritorial | 1899 |
| I.P.F. Construction (Hull) Limited | | 1976 |
| I.P.M. Pensioneer Trustees Limited | Professional & scientific | 1992 |
| I.P.M. Ssas Administration Limited | Professional & scientific | 2003 |
| I.P.M. Trustees Limited | Financial services | 1994 |