| HSM Convenience Store Ltd | Wholesale & retail | 2021 |
| Hsqe Consultancy Group Ltd | Financial services | 2021 |
| Hsqe Consultancy Ltd | Education | 2015 |
| Hsqe Training Ltd | Education | 2021 |
| Hsqehub Ltd | Information & communication | 2021 |
| HSR Driving School Ltd | Education | 2022 |
| Htlt Ltd | Transport & logistics | 2024 |
| HTR Assets Ltd | Wholesale & retail | 2025 |
| Hubbard Interiors Ltd | Professional & scientific | 2024 |
| Hudson Travis Limited | Wholesale & retail | 2025 |
| Humphrey Hire Limited | Wholesale & retail | 2025 |
| Humpty Momo Limited | Hospitality | 2024 |
| Hustle Film & Music Productions UK Ltd | Information & communication | 2026 |
| Hybrid Builders Ltd | Construction | 2018 |
| Hygge Hugs Ltd | Professional & scientific | 2016 |
| Hyper Sweep Ltd | Administrative & support | 2020 |
| Hypersphere Consulting Ltd | Information & communication | 2024 |
| I B Foods Ltd | Hospitality | 2019 |
| I Sugarcoat Everything Ltd | Hospitality | 2019 |
| I&I Courier Services Ltd | Transport & logistics | 2022 |
| I&P Automotive Ltd | Wholesale & retail | 2023 |
| I'Ll Deliver Ltd | Information & communication | 2026 |
| I2 Care Limited | Other services | 2012 |
| IA Executive Limited | Administrative & support | 2025 |
| Iain Collie Architecture Limited | Professional & scientific | 2021 |
| IBL Building & Landscaping Ltd | Construction | 2024 |
| IBN E Saif Immigration Chambers Ltd | Professional & scientific | 2026 |
| Icbs Global Limited | Education | 2019 |
| Iccmotors Ltd | Wholesale & retail | 2021 |
| ICP Coaching & Development Ltd | Professional & scientific | 2021 |
| Ideal Kitchen Makeovers Limited | Construction | 2015 |
| IDS Construction Ltd | Construction | 2018 |
| IF Ventures Limited | Wholesale & retail | 2023 |
| IFE Star Cleaning Limited | Administrative & support | 2025 |
| Illyrian Barber 1 Ltd | Other services | 2026 |
| Illyrian Barber Ltd | Other services | 2023 |
| ILS Couriers Ltd | Transport & logistics | 2022 |
| IM & Sons Ltd | Construction | 2023 |
| IM Trading PVT Ltd | Construction | 2022 |
| Imabi Community CIC | Other services | 2023 |
| Imabi Ltd | Information & communication | 2020 |
| Imagineering Assets Ltd | Administrative & support | 2016 |
| Imagineering World Limited | Professional & scientific | 2011 |
| Imarni Homes Limited | Construction | 2024 |
| Imarni Mews Management Limited | Real estate | 2012 |
| Imees Barber Ltd | Other services | 2019 |
| Immigration Advisers Ltd | Professional & scientific | 2023 |
| Impact AI Analytics Ltd | Information & communication | 2018 |
| IMT Engineering Solutions Limited | Professional & scientific | 2013 |
| Incarace Limited | Arts & recreation | 1983 |
| Inclusive Trading Community Interest Company | Administrative & support | 2010 |
| Incomplete TCG Ltd | Wholesale & retail | 2026 |
| Indent Marketing Solutions Limited | Administrative & support | 2012 |
| Individualised Limited | Professional & scientific | 2023 |
| Indy's Unisex Hair Salon Ltd | Other services | 2020 |
| Infa Universal Ltd | Professional & scientific | 2017 |
| Inferatech Ltd | Information & communication | 2025 |
| Infinity Auto Solutions Limited | Wholesale & retail | 2014 |
| Infinity Property Partnerships Ltd | Hospitality | 2022 |
| Infinity Transformations Ltd | Manufacturing | 2014 |
| Infocar Warehouse Limited | Professional & scientific | 2005 |
| Innovation ARM Ltd | Information & communication | 2020 |
| Innovative Geeks Ltd | Wholesale & retail | 2023 |
| INS Network Ltd | Financial services | 2021 |
| Inside OUT Cleaning Limited | Administrative & support | 2007 |
| Inspirations Gifts Limited | Wholesale & retail | 2011 |
| Inspired Electrical Contractors Limited | Construction | 2013 |
| Inspired Living Solutions Ltd | Real estate | 2025 |
| Instrumentation General Services Limited | Transport & logistics | 2025 |
| Integrated Security Design Limited | Administrative & support | 2008 |
| Intellectuals Limited | Information & communication | 2023 |
| Intelligent Rewards Limited | Extraterritorial | 2019 |
| Interactive Finance Limited | Financial services | 2008 |
| International Olefines Limited | Professional & scientific | 2023 |
| International Tours and Travels Ltd | Extraterritorial | 2026 |
| Internet Savers Ltd | Information & communication | 2018 |
| Internet Security Bureau Limited | Extraterritorial | 2005 |
| Intrust Health Limited | Administrative & support | 2013 |
| Intuitive English Accelerated Learning System Ltd | Education | 2025 |
| Intuitive Intelligence Ltd | Professional & scientific | 2025 |
| Inverter Drive Repair Limited | Manufacturing | 2022 |
| IOR Logistics Ltd | Transport & logistics | 2023 |
| Ipeak Healthcare Services Ltd | Health & social care | 2024 |
| Ipsum Creative Studio Ltd | Professional & scientific | 2025 |
| IQ Print and Design Ltd | Professional & scientific | 2015 |
| Irratex Group Ltd | Information & communication | 2026 |
| Island Focus Co Ltd | Administrative & support | 2015 |
| Island Risk Management Ltd | Administrative & support | 2026 |
| Island Vybz Cafe Ltd | Hospitality | 2021 |
| Isoera Consulting Ltd | Professional & scientific | 2026 |
| Issa and Sons Ltd | Health & social care | 2024 |
| Issada Security Services Limited | Administrative & support | 2019 |
| IT & TW Optical Services Limited | Health & social care | 2022 |
| IT Disposal Limited | Other services | 2020 |
| Italian Food Fireaway Limited | Hospitality | 2020 |
| ITC Communications Ltd | Information & communication | 2015 |
| ITI Holdings (London) Limited | Professional & scientific | 2012 |
| Ittiger Solutions Limited | Information & communication | 2017 |
| IV Car Repairs Ltd | Wholesale & retail | 2026 |
| J M Metal Fabrication Ltd | Manufacturing | 2020 |