| HUE & Heal Ltd | Professional & scientific | 2025 |
| Hugo Hanks Ltd | Administrative & support | 2023 |
| Humble Logistics Limited | Transport & logistics | 2026 |
| Hunar Transport Ltd | Transport & logistics | 2024 |
| Hyacinth Ltd | Real estate | 2014 |
| Hybrinet Limited | Information & communication | 2026 |
| Hyder Service Ltd | Wholesale & retail | 2026 |
| Hyderabad Association UK Ltd | Health & social care | 2016 |
| Hyenas Corp Limited | Wholesale & retail | 2025 |
| Hyken Ltd | Administrative & support | 2016 |
| I for India Limited | Other services | 2015 |
| I Love Padel Tennis Ltd | Wholesale & retail | 2026 |
| I&B 2022 Ltd | Wholesale & retail | 2022 |
| I&Dm Limited | Wholesale & retail | 2024 |
| IAG Transform Limited | Administrative & support | 2014 |
| IAN Atkins Ltd | Transport & logistics | 2018 |
| Ibase Limited | Real estate | 2024 |
| IBS Interiors Ltd | Construction | 2025 |
| Ibujo Ltd | Administrative & support | 2017 |
| ICC Optimum Solutions Ltd | Transport & logistics | 2018 |
| Ice Dream ME Ltd | Hospitality | 2016 |
| Icematik Network 5G Ltd | Manufacturing | 2022 |
| ICONIC1 Ltd | Transport & logistics | 2022 |
| IDB Investments Ltd | Real estate | 2022 |
| Ideas HQ Limited | Professional & scientific | 2017 |
| Idrive Worldwide Ltd | Transport & logistics | 2019 |
| IFK Holdings Limited | Real estate | 2021 |
| Iftiin Home Care Ltd | Public administration | 2022 |
| Igaming Progress Ltd | Professional & scientific | 2024 |
| IH Chopra Ltd | Real estate | 2026 |
| Ihlara 68 Ltd | Hospitality | 2025 |
| Ihoophere Ltd. | Education | 2024 |
| IJK Investor Services Limited | Financial services | 2009 |
| Ikhan Fitness Ltd | Arts & recreation | 2019 |
| Iklick Image Limited | Professional & scientific | 2016 |
| ILE Thomas Qualifications Ltd | Education | 2024 |
| ILE Thomas School of Arts Limited | Education | 2023 |
| Ilsley's Wholesale Supplies Limited | Wholesale & retail | 2017 |
| Imaan Ghauri Ltd | Professional & scientific | 2025 |
| Impedance Ltd | Construction | 2022 |
| Imperial Commerce Ltd | Information & communication | 2016 |
| Imperial Information Consultancy Ltd | Other services | 2016 |
| Imperial Property Improvements Ltd | Professional & scientific | 2020 |
| Imperial Services Group Ltd | Administrative & support | 2025 |
| Import Effects Ltd | Wholesale & retail | 2020 |
| IMT Food Ltd | Wholesale & retail | 2025 |
| Independent Pet Health Ltd | Professional & scientific | 2025 |
| Indesign Construction Limited | Wholesale & retail | 2021 |
| Indian Coffee Club Ltd | Hospitality | 2020 |
| Indifresh Ltd | Wholesale & retail | 2011 |
| Infectedmotogp Limited | Wholesale & retail | 2024 |
| Infinity Hope Limited | Financial services | 2024 |
| Infinity Transfers Ltd | Transport & logistics | 2025 |
| Infoflyte Limited | Information & communication | 2011 |
| Information Technology Services Limited | Information & communication | 2025 |
| Informed Patient Online Limited | Education | 2025 |
| Infratex Holdings Limited | Financial services | 2025 |
| Inked Clothes Ltd | Wholesale & retail | 2025 |
| Innocqox Ltd | Information & communication | 2019 |
| Inspiration Central Engineering Limited | Construction | 2024 |
| Inspire Computing Ltd | Information & communication | 2018 |
| Inspire Storage Limited | Information & communication | 2025 |
| Inspired Decorators Ltd | Construction | 2015 |
| Insta Defence Ltd | Administrative & support | 2023 |
| Insultec Limited | Construction | 1987 |
| Integar Ltd | Wholesale & retail | 2025 |
| Integrity Financial Services Ltd | Financial services | 2017 |
| Intek Investment Ltd | Real estate | 2018 |
| Intelisys Technologies Limited | Information & communication | 2015 |
| Internal Art Productions Limited | Construction | 2018 |
| International Dermatology Clinics Harley Street Ltd | Health & social care | 2024 |
| International Support Services Limited | Professional & scientific | 2025 |
| Interpoise Limited | Real estate | 1997 |
| Intu.Online Limited | Wholesale & retail | 2016 |
| Investar Limited | Real estate | 2019 |
| Invictus Autos Ltd | Wholesale & retail | 2021 |
| Invoxhub Ltd | Wholesale & retail | 2024 |
| IRB Trade Limited | Extraterritorial | 2015 |
| Iride Airport Services Ltd | Transport & logistics | 2025 |
| Iridescence Counselling Services Ltd | Health & social care | 2023 |
| Iris Security Ltd | Administrative & support | 2017 |
| Ironlion Gym Wear Ltd | Wholesale & retail | 2020 |
| Ironshield Fire and Security Ltd | Construction | 2026 |
| Irydo Ltd | Information & communication | 2026 |
| Isabeln Ltd | Health & social care | 2019 |
| Itaxassociates Private Limited | Professional & scientific | 2018 |
| Itdotcom Ltd | Information & communication | 2008 |
| Itech Global Services Ltd | Information & communication | 2021 |
| Itheadache Ltd | Information & communication | 2024 |
| Itqan Ltd | Wholesale & retail | 2025 |
| Itsss Ltd | Information & communication | 2016 |
| Iver Estates Ltd | Real estate | 2026 |
| Ivorlite Limited | Information & communication | 2013 |
| IVY Tax Consultants Ltd | Professional & scientific | 2007 |
| Ivy&Sage Homecare Ltd | Health & social care | 2020 |
| J & M Electrical West London Ltd | Construction | 2013 |
| J J Pearce Ltd | Information & communication | 2016 |
| J Lawrence Site Services Ltd | Construction | 2012 |
| J&A Best Food and Wine Limited | Wholesale & retail | 2015 |
| J&B Consultancy Ltd | Education | 2025 |