| Hyfe Limited | Real estate | 2017 |
| Hygge House Management Ltd | Administrative & support | 2019 |
| Hygiecup Ltd | Wholesale & retail | 2020 |
| Hygienic Solutions (UK) Limited | Extraterritorial | 2009 |
| Hygienique Ltd | Professional & scientific | 2021 |
| Hygion Cleaning Solutions Limited | Administrative & support | 2025 |
| Hyli Technical Limited | Professional & scientific | 2015 |
| Hylton & Dawson Limited | Transport & logistics | 2008 |
| Hymar | Professional & scientific | 2023 |
| Hynn Ventures Limited | Wholesale & retail | 2020 |
| HYO Holdings Limited | Financial services | 2021 |
| Hypa Active Ltd | Wholesale & retail | 2010 |
| Hype Motors Ltd | Wholesale & retail | 2020 |
| Hype Ward Ltd | Wholesale & retail | 2025 |
| Hypeful Ltd | Professional & scientific | 2022 |
| Hyper Clean Services Ltd | Administrative & support | 2024 |
| Hyper Ebike (UK) Ltd | Wholesale & retail | 2025 |
| Hyper Grace Parcel Ltd | Transport & logistics | 2021 |
| Hyper Grace Property Limited | Real estate | 2025 |
| Hyper Tech Ltd | Wholesale & retail | 2025 |
| Hyperbaric Wellness Limited | Health & social care | 2022 |
| Hypercrave Limited | Hospitality | 2026 |
| Hyperglow Tech Ltd | Information & communication | 2026 |
| Hyperionx Interactive Limited | Arts & recreation | 2026 |
| Hyperoo Ltd | Wholesale & retail | 2025 |
| Hyperpulsetechnologies Ltd | Wholesale & retail | 2024 |
| Hypersaf Ltd | Wholesale & retail | 2022 |
| Hypescout Ltd | Professional & scientific | 2018 |
| Hyphen Marketing Ltd | Professional & scientific | 2004 |
| Hyslop Investments Ltd | Real estate | 2019 |
| Hyspec Coatings Limited | Manufacturing | 2018 |
| Hystride Ltd | Manufacturing | 2023 |
| Hzzn Holdings Ltd | Information & communication | 2023 |
| I & B Properties Leics Ltd | Real estate | 2024 |
| I & S W Limited | Professional & scientific | 2007 |
| I a Future Holdings Limited | Financial services | 2020 |
| I AM Nayan Ltd | Professional & scientific | 2021 |
| I AM UN Limited | Real estate | 2013 |
| I B Cleaning Ltd | Administrative & support | 2026 |
| I Bear Fitness Limited | Arts & recreation | 2026 |
| I Buy ANY Car Abby Road Ltd | Wholesale & retail | 2026 |
| I CAN SEE Clearly NOW Ltd | Administrative & support | 2021 |
| I Care Global Ltd | Health & social care | 2022 |
| I Design Leic Ltd | Manufacturing | 2018 |
| I DO SEO Ltd | Professional & scientific | 2025 |
| I Dragon Limited | Hospitality | 2019 |
| I FIX IT Ltd | Information & communication | 2006 |
| I G S Transport Ltd | Transport & logistics | 2017 |
| I Garvey (2024) Limited | Real estate | 2024 |
| I H Properties Ltd | Construction | 2013 |
| I H R Ltd | Manufacturing | 2019 |
| I Hate Numbers Limited | Education | 2006 |
| I J S Kirkman Limited | Professional & scientific | 2000 |
| I K Investments Limited | Real estate | 2010 |
| I Know a GUY Consultancy Ltd | Construction | 2021 |
| I L Technology Ltd | Wholesale & retail | 2025 |
| I Lets Corp Limited | Real estate | 2017 |
| I M N Holdings Ltd | Real estate | 2025 |
| I M Z Investments Ltd | Real estate | 2022 |
| I Print Digital Limited | Manufacturing | 2005 |
| I Print Graphic Solutions Limited | Manufacturing | 2013 |
| I Prop Lettings Ltd | Real estate | 2020 |
| I Really Love IT Limited | Hospitality | 2015 |
| I S B Maintenance Limited | Construction | 2024 |
| I S F Group Limited | Manufacturing | 1901 |
| I S News Ltd | Wholesale & retail | 2013 |
| I S Property Investments Limited | Real estate | 2023 |
| I SEE PVT Ltd | Professional & scientific | 2020 |
| I Star Wholesale Limited | Wholesale & retail | 2018 |
| I T T S Transport Ltd | Transport & logistics | 2020 |
| I the Future of Cosmetics Ltd | Wholesale & retail | 2024 |
| I Travel Hotels Limited | Administrative & support | 2016 |
| I U Car Services Ltd | Wholesale & retail | 2022 |
| I Wiser Solution Ltd | Professional & scientific | 2024 |
| I Y (Leicester) Limited | Professional & scientific | 2013 |
| I Z Holdings Limited | Financial services | 2018 |
| I&I Lettings Limited | Real estate | 2019 |
| I&S Works Limited | Construction | 2018 |
| I-Gicom Ltd | Wholesale & retail | 2023 |
| I-Goc Limited | Health & social care | 2014 |
| I-Prev Clarity Limited | Construction | 2025 |
| I-Read Limited | Wholesale & retail | 2013 |
| I-Smile Care Ltd | Health & social care | 2017 |
| I-Squared Enterprise Limited | Professional & scientific | 2015 |
| I-Synergy Hosting Limited | Information & communication | 2015 |
| I. N. B. Design Limited | Professional & scientific | 2017 |
| I.A.Z.F.S Limited | Administrative & support | 2014 |
| I.C.Electrical Leis Ltd | Construction | 2016 |
| I.M.Equestrian Holdings Ltd | Agriculture & fishing | 2024 |
| I.M.I Fashions Limited | Manufacturing | 2019 |
| I.P Imports & Exports Limited | Wholesale & retail | 2025 |
| I.R. Properties (Leic) Ltd | Real estate | 2021 |
| I.S Tech Solutions Ltd | Information & communication | 2018 |
| I.S. Technologies Limited | Information & communication | 1999 |
| I.S.F. Motors Limited | Wholesale & retail | 1977 |
| I.S.P. Dental Limited | Health & social care | 2007 |
| I.T. for One Limited | Information & communication | 2006 |
| I.T. Systems & Solutions (TJB) Ltd | Information & communication | 2022 |
| I.W. Burbela Limited | Professional & scientific | 2000 |
| I.Z. Trading Co. Limited | Wholesale & retail | 1988 |