| Iaan Accounts Ltd | Professional & scientific | 2022 |
| IAN Pugh Limited | Wholesale & retail | 2015 |
| Iany Building Ltd | Construction | 2021 |
| IBC Brickfinder Limited | Wholesale & retail | 2022 |
| IBC Group Holding Limited | Financial services | 2026 |
| Ibrow & Beauty Limited | Arts & recreation | 2014 |
| ICA Accountants Limited | Professional & scientific | 2018 |
| ICB Express Ltd | Construction | 2017 |
| ICC Construction Ltd | Construction | 2026 |
| Iceni Nominees (NO. 1) Limited | Administrative & support | 2001 |
| Iceni Nominees (NO. 1B) Limited | Real estate | 2002 |
| Iceni Nominees (NO.1A) Limited | Real estate | 2002 |
| Iconic Spaces Cardiff Ltd | Real estate | 2026 |
| Iconic Spaces Ltd | Real estate | 2021 |
| Iconicsocial Ltd | Wholesale & retail | 2021 |
| ICS International Contract Services Limited | Real estate | 1982 |
| ICS International Corporate Services Limited | Professional & scientific | 2003 |
| ICS Real Estates Limited | Real estate | 2004 |
| Icubes Global Ltd | Information & communication | 2025 |
| Icure Ltd | Wholesale & retail | 2022 |
| Ideal Interface Limited | Information & communication | 2007 |
| Idealnet Limited | Professional & scientific | 2001 |
| IDM Contracts Ltd | Construction | 2019 |
| Idna Ltd. | Professional & scientific | 2014 |
| IDO I.T. Limited | Information & communication | 2000 |
| Idris Contractors Ltd | Construction | 2022 |
| Iems Technology Ltd | Professional & scientific | 2021 |
| IFM Premium Education Ltd | Administrative & support | 2023 |
| IFS. Construction Ltd | Construction | 2020 |
| Ignite Property Investments Limited | Real estate | 2016 |
| Ignitus Limited | Information & communication | 2009 |
| IHS UK Holding Ltd | Professional & scientific | 2009 |
| IK Property Holdings Limited | Real estate | 2016 |
| Ikal Ltd | Administrative & support | 2016 |
| IL Padrino's House Ltd | Hospitality | 2025 |
| Ilectrics Global Ltd | Wholesale & retail | 2024 |
| ILG (London) Nominee 1 Limited | Extraterritorial | 2019 |
| ILG (London) Nominee 2 Limited | Extraterritorial | 2019 |
| ILG (London) Nominee 3 Limited | Extraterritorial | 2019 |
| ILG London 1 Nursery Limited | Education | 2024 |
| ILG London 2 Nursery Limited | Education | 2024 |
| ILG London 3 Nursery Limited | Education | 2024 |
| ILG London 4 Nursery Limited | Education | 2026 |
| ILG London 5 Nursery Limited | Education | 2026 |
| ILG London Nursery Limited | Education | 2024 |
| ILG UK Nursery Limited | Education | 2024 |
| Illuminati Consulting Ltd | Information & communication | 2026 |
| IMC Digital Media Limited | Information & communication | 1998 |
| Imea Drinks Limited | Wholesale & retail | 2022 |
| Immobiliare Sator Ltd | Financial services | 2020 |
| Immoneg Limited | Real estate | 2018 |
| Impact Operations Limited | Administrative & support | 2023 |
| Imperial Ambitions Limited | Professional & scientific | 2000 |
| Imperial in & OUT Group Ltd | Professional & scientific | 2026 |
| IN Toto Electronics Limited | Information & communication | 1999 |
| In-Style Direct Limited | Wholesale & retail | 2004 |
| Inc Cleaning Services Ltd | Administrative & support | 2026 |
| Inchcap Utility Management Ltd | Administrative & support | 2022 |
| Inclusion Together Ltd | Education | 2014 |
| Incorporate Entertainment Limited | Arts & recreation | 2004 |
| Independent Buying Consortium Limited | Administrative & support | 2008 |
| Independiente Music Publishing Limited | Information & communication | 1996 |
| Indesign Retail Limited | Wholesale & retail | 2014 |
| Indian Lounge Scarborough Ltd | Hospitality | 2018 |
| Indian Marigold Limited | Hospitality | 2019 |
| Indian Ocean Investments Limited | Financial services | 2020 |
| Indian Parade Limited | Hospitality | 2019 |
| Indian Street Food London Ltd | Hospitality | 2025 |
| Indigo Global Capital Limited | Professional & scientific | 2014 |
| Indigo YIN Limited | Professional & scientific | 2006 |
| Indigobridge Investments Limited | Real estate | 2024 |
| Indus Advisory Limited | Professional & scientific | 2024 |
| Infatech Security System Limited | Administrative & support | 2015 |
| Infinite Advisory Ltd | Professional & scientific | 2022 |
| Infinite Joy Limited | Arts & recreation | 2020 |
| Infiniteglow Ltd | Other services | 2024 |
| Infinity Consulting (UK) Limited | Information & communication | 2011 |
| Infinity Growth Ltd | Real estate | 2025 |
| Infinity Home Insulation Ltd | Construction | 2023 |
| Infinity Management and Estates Ltd | Households | 2025 |
| Inflight Initiatives Limited | Wholesale & retail | 1990 |
| Informatics IT Solutions Limited | Information & communication | 2024 |
| Infovestech Limited | Information & communication | 2024 |
| Infrasob Ltd | Professional & scientific | 2019 |
| Ingenious Research Centre for Medical Research (Ircmr) Ltd | Information & communication | 2026 |
| Iniya Clinic Ltd | Other services | 2011 |
| Injaz Al-Fakhr for Scraps Ltd | Wholesale & retail | 2022 |
| Inkiboo Ltd | Information & communication | 2014 |
| Inkwell Studios Ltd. | Professional & scientific | 2016 |
| Inner Core Training Ltd | Arts & recreation | 2019 |
| Inner Joy Foundation Limited | Professional & scientific | 2008 |
| Inner Yoga Retreats Ltd | Administrative & support | 2022 |
| Innerbloom Ltd | Hospitality | 2022 |
| Innovating Motion Limited | Information & communication | 2014 |
| Innovation Assets Ltd | Real estate | 2022 |
| Innovation Fresh UK PVT Limited | Hospitality | 2015 |
| Innovation Prime Ltd | Wholesale & retail | 2023 |
| Innovation Resourcing UK PVT Limited | Information & communication | 2012 |
| Innovation Sourcing UK PVT Limited | Hospitality | 2010 |
| Innovative Social Technologies Limited | Information & communication | 2020 |