| Hugo ROY Consultancy Ltd | Professional & scientific | 2025 |
| Hugs and Stitches Ltd | Manufacturing | 2025 |
| Huiban Ltd | Transport & logistics | 2023 |
| Human Resource Solutions & Consultancy Limited | Professional & scientific | 2012 |
| Humble Auto Club Ltd | Wholesale & retail | 2026 |
| Humbles Sandwich Bar Ltd | Hospitality | 2021 |
| Humpties Holdings Limited | Financial services | 2026 |
| Humpty Dumpty Day Nurseries Ltd | Education | 2003 |
| Humzah’S Ltd | Transport & logistics | 2025 |
| Hungry Mexican Ltd | Hospitality | 2025 |
| Hunters 25 Limited | Wholesale & retail | 2016 |
| Huskisson Obrien Ltd | Construction | 2024 |
| Husnain Building Services Ltd | Construction | 2022 |
| Hustl Nutrition Ltd | Wholesale & retail | 2019 |
| Hustle Hub Consulting Ltd | Wholesale & retail | 2025 |
| Hutchison Electrical Contractor Limited | Construction | 1998 |
| Huthman Football Club Limited | Arts & recreation | 2020 |
| Hutton + Rostron Environmental Investigations Limited | Administrative & support | 1988 |
| HWH Property Limited | Real estate | 2023 |
| Hyde Hospitality Trading Ltd | Hospitality | 2024 |
| Hygienie Limited | Professional & scientific | 2016 |
| Hyperlink Insights Ltd | Wholesale & retail | 2025 |
| Hypertrophy Blueprint Ltd | Wholesale & retail | 2026 |
| Hytec Innovation Ltd | Information & communication | 2013 |
| I Baba Ltd | Wholesale & retail | 2024 |
| I Need a Car Ltd | Wholesale & retail | 2019 |
| I. R. Abbi Ltd | Transport & logistics | 2026 |
| I.C.I.C.B. Ltd | Wholesale & retail | 2019 |
| IAN COX Building Contractors Limited | Construction | 2015 |
| IAN Walker Properties Limited | Real estate | 2007 |
| IAN Wright Decorators Limited | Construction | 2009 |
| IAS Training Solutions Ltd | Professional & scientific | 2025 |
| IBX Group Ltd | Real estate | 2025 |
| Icars Burton Upon Trent Limited | Transport & logistics | 2019 |
| Icars Holdings Ltd | Transport & logistics | 2020 |
| Ice AGE Desserts Ltd | Hospitality | 2025 |
| Ichthyosis Support Group | Information & communication | 2011 |
| Iconic Heating & Cooling Ltd | Construction | 2021 |
| Icosele Ltd | Professional & scientific | 2024 |
| Icosele Organisation Ltd | Information & communication | 2026 |
| ICT Service Limited | Information & communication | 2014 |
| Idazena's Ltd | Wholesale & retail | 2025 |
| Idis Group Holdings Limited | Extraterritorial | 2005 |
| Idis Group Limited | Extraterritorial | 2004 |
| Idis Limited | Extraterritorial | 1987 |
| Ietg Holdings Limited | Administrative & support | 2016 |
| Ietg Limited | Administrative & support | 2005 |
| Ignis Global Ltd | Administrative & support | 2015 |
| Ignite Firewood Ltd | Wholesale & retail | 2022 |
| Ignite Lean Solutions Ltd | Professional & scientific | 2019 |
| IHL Solutions Ltd | Information & communication | 2012 |
| Ihsan Arabic Limited | Education | 2022 |
| Iklean-Group(Uk) Limited | Water & waste | 2025 |
| Iklean-Sports & Arenas Ltd | Water & waste | 2023 |
| Ikvild Ltd | Manufacturing | 2021 |
| IL Futures Ltd | Financial services | 2026 |
| ILI Trans Limited | Transport & logistics | 2018 |
| IM Electrical & Fire Ltd | Construction | 2022 |
| IM Property Consultants Limited | Real estate | 2016 |
| IMA Solutions Ltd | Construction | 2020 |
| Image & Pride Ltd | Hospitality | 2023 |
| Image in Vinyl Ltd | Manufacturing | 2018 |
| Impello Property Holdings Ltd | Financial services | 2025 |
| Imperial UK Properties Limited | Real estate | 2024 |
| Imperio Estate Limited | Professional & scientific | 2003 |
| Imperitas Security Group Limited | Administrative & support | 2018 |
| Impish Limited | Extraterritorial | 2004 |
| Import Export P&M Limited | Transport & logistics | 2019 |
| Impulse Geophysics Limited | Administrative & support | 2002 |
| Imran IT Solutions Ltd | Information & communication | 2013 |
| Imran Minibus Ltd | Transport & logistics | 2026 |
| Imzzz Food Ltd | Hospitality | 2019 |
| Inboundr Limited | Professional & scientific | 2018 |
| Incordemeo Dog Breeding Limited | Other services | 2019 |
| Indeavour Holdings Limited | Financial services | 2025 |
| Independence School of Motoring Limited | Education | 2004 |
| Inder S Transport Ltd | Transport & logistics | 2021 |
| Indian Association C.I.C. | Other services | 2024 |
| Indian Palace Eatery Limited | Hospitality | 2026 |
| Industrial Contracting Services Limited | Construction | 2014 |
| Infion Scientific Ltd | Manufacturing | 2008 |
| Infolink Ltd | Information & communication | 2020 |
| Information Security Advice Limited | Professional & scientific | 2013 |
| Ingen-Gas Ltd | Construction | 2020 |
| Inger Electrical Contractors Ltd | Construction | 2026 |
| Ingo Joinery Ltd | Manufacturing | 2018 |
| Inicio Media Group Ltd | Administrative & support | 2019 |
| Injection Moulding Technical Services Ltd | Professional & scientific | 2021 |
| Inkd Inc Ltd | Arts & recreation | 2025 |
| Innova IT Limited | Information & communication | 2014 |
| Innovate Prosper Ltd | Professional & scientific | 2025 |
| Innovo Project Management Ltd | Other services | 2022 |
| Inovatic Ltd | Wholesale & retail | 2024 |
| Inside the Popcorn Box Ltd | Information & communication | 2025 |
| Insight Security Risk Management Ltd | Administrative & support | 2025 |
| Insley Holdings Limited | Financial services | 2026 |
| Inspire Activity Ltd | Professional & scientific | 2011 |
| Inspired by YOU Group Limited | Wholesale & retail | 2024 |
| Inspired Gaming (Colombia) Limited | Administrative & support | 2011 |
| Inspired Gaming (Greece) Limited | Wholesale & retail | 2014 |