| Independence Support Ltd | Health & social care | 2017 |
| Independent Abrasives Limited | Wholesale & retail | 2008 |
| Independent Advisory Services Limited | Professional & scientific | 2021 |
| Independent Agriculture Limited | Agriculture & fishing | 1992 |
| Independent Community Living (Holdings) Limited | Extraterritorial | 2001 |
| Independent Development Services Limited | Real estate | 2007 |
| Independent Media Limited | Arts & recreation | 2022 |
| Independent Signal Design Limited | Professional & scientific | 2006 |
| Independent Tool Company Limited | Professional & scientific | 1982 |
| Independently CIC | Administrative & support | 2019 |
| Indexfirst Limited | Professional & scientific | 2003 |
| Indian Curry Cheltenham Ltd | Hospitality | 2024 |
| Indian Groceries Plus UK Ltd | Wholesale & retail | 2022 |
| Indian Haveli Cheltenham Ltd | Hospitality | 2024 |
| Indie East Village Ltd | Arts & recreation | 2018 |
| Indie Isle of Dogs Limited | Arts & recreation | 2024 |
| Indie Peckham Ltd | Arts & recreation | 2020 |
| Indigo Analysis Ltd | Professional & scientific | 2011 |
| Indigo Creative Productions Ltd | Professional & scientific | 2025 |
| Indigo Land Limited | Professional & scientific | 2017 |
| Indigo Place Management Company Limited | Households | 2009 |
| Indigo Portfolio Ltd | Real estate | 2018 |
| Induction Technical Solutions Limited | Manufacturing | 2019 |
| Industrial & Engineering Recruitment Ltd | Administrative & support | 2020 |
| Industrial Lifting Solutions Ltd | Manufacturing | 2009 |
| Industrial Supply Chain Limited | Wholesale & retail | 2005 |
| Industryfools Ltd | Wholesale & retail | 2025 |
| Inertia Construction Engineering Ltd | Information & communication | 2009 |
| Inferix Limited | Extraterritorial | 2012 |
| Infinicore Solutions Limited | Wholesale & retail | 2023 |
| Infiniti I.T. Limited | Information & communication | 2011 |
| Inflectix Limited | Arts & recreation | 2018 |
| Influx Technologies Limited | Information & communication | 2019 |
| Inga Accountancy Services Limited | Professional & scientific | 2014 |
| Ingemann Ltd | Information & communication | 2022 |
| Ingenious Engineering Limited | Professional & scientific | 2023 |
| Ingeno Limited | Professional & scientific | 2014 |
| Inglebrew Limited | Health & social care | 2026 |
| Inholmes Nominees Limited | Professional & scientific | 2021 |
| Inhousew Limited | Education | 2020 |
| Inicio Design Limited | Real estate | 2023 |
| Injection Mouldings Limited | Manufacturing | 1994 |
| INK Press Ltd | Information & communication | 2025 |
| Inktrovert Limited | Professional & scientific | 2021 |
| Inky Green Fingers Ltd | Other services | 2023 |
| Inmarche Ltd | Real estate | 2020 |
| Inndecs Limited | Construction | 1997 |
| Inndulge Ltd | Hospitality | 2014 |
| Innerp Limited | Professional & scientific | 2020 |
| Innisacre Limited | Real estate | 1972 |
| Innkeeping Limited | Real estate | 2000 |
| INNOV8 Rugby Limited | Professional & scientific | 2022 |
| Innova Bidco Limited | Financial services | 2022 |
| Innova Capital Europe Limited | Financial services | 2022 |
| Innova Capital Limited | Financial services | 2015 |
| Innova Consulting Services Ltd | Professional & scientific | 2017 |
| Innova Energy Holdings Limited | Financial services | 2022 |
| Innova Energy II Limited | Energy | 2022 |
| Innova Energy Limited | Financial services | 2022 |
| Innova Estates Limited | Financial services | 2023 |
| Innova Fanny House Farm Holdco Limited | Financial services | 2022 |
| Innova Group Limited | Financial services | 2024 |
| Innova Holdings Limited | Financial services | 2019 |
| Innova NG Operations Ltd | Energy | 2023 |
| Innova Partners Limited | Financial services | 2025 |
| Innova Property Limited | Professional & scientific | 2015 |
| Innova Renewables Developments Limited | Professional & scientific | 2019 |
| Innova Renewables Holdings Limited | Financial services | 2020 |
| Innova Renewables Limited | Energy | 2019 |
| Innova Renewables NG Holdings II Ltd | Financial services | 2023 |
| Innova Renewables NG Holdings Limited | Financial services | 2021 |
| Innova Solar Limited | Financial services | 2022 |
| Innova Ventures Limited | Extraterritorial | 2024 |
| Innova Wrexham Property Holdings Limited | Real estate | 2019 |
| Innovagen Limited | Water & waste | 2017 |
| Innovare Pro Limited | Professional & scientific | 2024 |
| Innovasion Limited | Real estate | 2025 |
| Inntown Hotels Limited | Hospitality | 2002 |
| INP Solutions Ltd | Administrative & support | 2018 |
| Inquisitive Traveller Limited | Financial services | 2023 |
| Insideout Technology Ltd | Wholesale & retail | 2008 |
| Insidesweat Limited | Health & social care | 2020 |
| Insight OUT Analytics Ltd | Information & communication | 2018 |
| Insight Projex Ltd | Manufacturing | 2011 |
| Insinto Ltd | Information & communication | 2022 |
| Insolnet Limited | Extraterritorial | 2011 |
| Insolvency Direct Ltd | Financial services | 2012 |
| Insolvicare Ltd | Extraterritorial | 2011 |
| Inspect&Adapt Limited | Information & communication | 2006 |
| Inspiration Property UK Limited | Real estate | 2018 |
| Inspiration Technology Limited | Information & communication | 1998 |
| Inspirational Selling Ltd | Administrative & support | 2010 |
| Inspire Impact Limited | Other services | 2025 |
| Inspired Efficiency Limited | Professional & scientific | 2013 |
| Inspired Minds Media Limited | Professional & scientific | 2016 |
| Inspired Properties Services Limited | Real estate | 2011 |
| Inspired Star Limited | Professional & scientific | 2011 |
| Inspiredprojectsuk Ltd | Professional & scientific | 2020 |
| Inspireducate Limited | Education | 2018 |
| Inspiring Delivery Limited | Professional & scientific | 2023 |