| Ingenious Property Refurbishments Ltd | Construction | 2017 |
| Ingenuity Digital Holdings Limited | Financial services | 2020 |
| Ingenuity Digital Limited | Information & communication | 2011 |
| Ingenuity Education Ltd | Education | 2026 |
| Ingenuity Employment Solutions Limited | Administrative & support | 2024 |
| Ingenuity Management Services Ltd | Administrative & support | 2018 |
| Ingfield Limited | Construction | 2022 |
| Ingham Frankland Fide Limited | Administrative & support | 2024 |
| Ingham Property Management Ltd | Real estate | 2021 |
| Ingham Vehicles Limited | Wholesale & retail | 2025 |
| Ingle Consulting Limited | Professional & scientific | 2018 |
| Ingledew Court Property Company Limited | Real estate | 1982 |
| Ingledew Developments Ltd | Real estate | 1994 |
| Ingledew Residents Management Company (Leeds) Limited | Households | 2004 |
| Inglenook Fireside Products Limited | Wholesale & retail | 2014 |
| Inglestone Associates Limited | Professional & scientific | 2011 |
| Inglewood Consultancy Ltd | Information & communication | 2020 |
| Inglis Jane Limited | Information & communication | 2001 |
| Ingram Lacey Education Ltd | Education | 2018 |
| Ingre Search Limited | Administrative & support | 2025 |
| Ingrid Kitzing Nutrition Limited | Professional & scientific | 2017 |
| Ings Court Management Limited | Households | 2000 |
| Ings House Care Limited | Health & social care | 2012 |
| Inguna Official Limited | Professional & scientific | 2020 |
| Inhabet Properties Limited | Households | 2019 |
| Inhale to Exhale CIC | Health & social care | 2023 |
| Inhalosome-C Limited | Extraterritorial | 2012 |
| Inhemsk Ltd | Professional & scientific | 2026 |
| Inhemsk Retail Ltd | Wholesale & retail | 2026 |
| Inhoco 3520 Limited | Professional & scientific | 2009 |
| Inhus Limited | Manufacturing | 2020 |
| Inicio Funding Solutions Limited | Financial services | 2023 |
| Inicio SPV 1 (CB) Limited | Financial services | 2024 |
| Inicio SPV 1 (SFS) Limited | Financial services | 2024 |
| Inicio SPV 2 (CB) Limited | Financial services | 2024 |
| Inicio SPV 2 (SFS) Limited | Financial services | 2024 |
| Inicio SPV 3 (CB) Limited | Financial services | 2024 |
| Inicio SPV 3 (SFS) Limited | Financial services | 2024 |
| Inicio SPV 4 (CB) Limited | Financial services | 2024 |
| Inicio SPV 4 (SFS) Limited | Financial services | 2024 |
| Inicio SPV 5 (CB) Limited | Financial services | 2024 |
| Inicio SPV 5 (SFS) Limited | Financial services | 2024 |
| Initial Developments Limited | Real estate | 2023 |
| Initial Property Ltd | Real estate | 2025 |
| Initial Security Ltd | Administrative & support | 2019 |
| Initial Spark Consulting Limited | Information & communication | 2011 |
| Initial Spark Limited | Information & communication | 2026 |
| Initiate 365 Limited | Information & communication | 2017 |
| Initiatec Limited | Information & communication | 2004 |
| Initiative Security Services Ltd | Administrative & support | 2023 |
| Inject Direct Ltd | Wholesale & retail | 2026 |
| Inject-O-Matic Guarantee Limited | Administrative & support | 1984 |
| Injector AI Limited | Information & communication | 2025 |
| INK Monkey Limited | Manufacturing | 2013 |
| INK on Cotton Limited | Wholesale & retail | 2014 |
| Inkiba Design and Installation Ltd | Wholesale & retail | 2025 |
| Inland Distribution Limited | Wholesale & retail | 2012 |
| Inlettings Ltd | Real estate | 2019 |
| Inline Mechanical Limited | Construction | 2019 |
| Inner Peace Experience Co. Ltd | Other services | 2025 |
| Inner Reach Coaching Ltd | Professional & scientific | 2022 |
| Innercity Maintenance and Cleaning Services Ltd | Other services | 2019 |
| Innercity Property Services Limited | Administrative & support | 2005 |
| Innercity Roofing (Yorkshire) Limited | Construction | 2007 |
| Innergy Group Limited | Financial services | 2007 |
| Innergy LPG (Bulk) Ltd | Manufacturing | 2007 |
| Innergy LPG Limited | Manufacturing | 2005 |
| Innergy Solid Fuels Limited | Wholesale & retail | 2003 |
| Innerpeace Ltd | Health & social care | 2017 |
| Innheritance Limited | Hospitality | 2016 |
| Inniscastle Care Limited | Health & social care | 2010 |
| Innosattva Ltd | Professional & scientific | 2022 |
| Innotech Investments Limited Fund KCP 1 L.P. | | 2007 |
| Innov Consulting Ltd | Information & communication | 2024 |
| INNOV8 Properties Ltd | Real estate | 2025 |
| Innova Legal Ltd | Professional & scientific | 2024 |
| Innova Property Group Ltd | Real estate | 2026 |
| Innovadient Ltd | Information & communication | 2022 |
| Innovalent Consulting Limited | Information & communication | 2015 |
| Innovate Contract Furniture Limited | Wholesale & retail | 2011 |
| Innovate Garden Design Ltd | Administrative & support | 2020 |
| Innovate Multimedia Ltd | Information & communication | 2007 |
| Innovatech Engineering Ltd | Information & communication | 2024 |
| Innovation Facility Management Ltd | Construction | 2024 |
| Innovation Fire Engineering (Holdings) Limited | Financial services | 2024 |
| Innovation Fire Engineering Limited | Professional & scientific | 2009 |
| Innovation Fire Research Ltd | Professional & scientific | 2021 |
| Innovation Impact Ventures Ltd | Information & communication | 2025 |
| Innovation Roofing and Cladding Ltd | Construction | 2018 |
| Innovative Curry Enterprises Limited | Manufacturing | 2014 |
| Innovative Foods Ltd | Manufacturing | 2015 |
| Innovative Portfolio Investments Ltd | Real estate | 2018 |
| Innovative Rebellion Limited | Information & communication | 2025 |
| Innovative Sanda Ltd | Health & social care | 2024 |
| Innovative TSM Limited | Administrative & support | 2020 |
| Innovent Digital Limited | Professional & scientific | 2021 |
| Innoverse Consultancy Ltd | Information & communication | 2025 |
| Innovise Consulting Group Ltd | Professional & scientific | 2024 |
| Innovista Education Ltd | Education | 2024 |
| Innowise Works Ltd | Professional & scientific | 2021 |