| Inbrit Enterprises Ltd | Other services | 2019 |
| Inbtwn Ltd | Hospitality | 2021 |
| Ince Restaurants Limited | Hospitality | 2021 |
| Incell Limited | Wholesale & retail | 2014 |
| Inclinox Ltd | Wholesale & retail | 2025 |
| Inclusive Economy & Business Forum Limited | Other services | 2015 |
| Inclusive Security Group Ltd | Public administration | 2020 |
| Incragold Limited | Real estate | 1986 |
| Incresco Glasgow Development Ltd | Construction | 2024 |
| Incresco LLP | | 2022 |
| Incresco Portsmouth Student NO 2 Ltd | Construction | 2024 |
| Incubate Management Consulting Ltd | Professional & scientific | 2020 |
| Indemnity Group Ltd | Construction | 2018 |
| Independence-Development Ltd | Health & social care | 2011 |
| Independent Choice Network Limited | Education | 2013 |
| Independent Living Consultancy Ltd | Information & communication | 2010 |
| Independent Media Corporation London Ltd | Wholesale & retail | 2016 |
| Independent Plus Pharma Limited | Administrative & support | 2024 |
| Inderjit Constructions Limited | Construction | 2024 |
| Indian Aroma Cuisine Limited | Hospitality | 2020 |
| Indian Business Network Limited | Health & social care | 2018 |
| Indian Restaurant & Bar Limited | Hospitality | 2025 |
| Indian Tamil Welfare Association UK | Health & social care | 2025 |
| Indiawest Ltd | Real estate | 2010 |
| Indiehacker Ventures Limited | Information & communication | 2023 |
| Indigenous Initiatives Ltd | Professional & scientific | 2018 |
| Indigenous People of Ambazonia (Ipoa) Limited | Education | 2020 |
| Indigo Children's Home Ltd | Health & social care | 2020 |
| Individual Automotive Ltd | Wholesale & retail | 2026 |
| Individual Choice Services Ltd | Health & social care | 2013 |
| Indra Beverages Limited | Wholesale & retail | 2018 |
| Indus London Limited | Other services | 2004 |
| Indus Valley Business & Financial Services Ltd | Professional & scientific | 2011 |
| Indus Valley Cars Ltd | Wholesale & retail | 2022 |
| Industrial Services (Europe) Limited | Professional & scientific | 1994 |
| Industrydeck Limited | Manufacturing | 2023 |
| Ineffability Ltd | Administrative & support | 2012 |
| Infinateloop IT Ltd | Information & communication | 2025 |
| Infinex Holdings Ltd | Financial services | 2026 |
| Infinite Business Solutions Ltd | Information & communication | 2020 |
| Infinite Music Limited | Arts & recreation | 1981 |
| Infinite People Ltd | Administrative & support | 2023 |
| Infinite Property Lettings Ltd | Wholesale & retail | 2024 |
| Infinite Residential Innovations Ltd | Construction | 2020 |
| Infiniti Sync Solutions Ltd | Information & communication | 2021 |
| Infinitus Solutions Limited | Professional & scientific | 2012 |
| Infinity Building BGT Ltd | Construction | 2022 |
| Infinity Care London Ltd | Health & social care | 2022 |
| Infinity Floss Ltd | Wholesale & retail | 2025 |
| Infinity Int'L Limited | Real estate | 2020 |
| Infinity Interior and Building Ltd | Construction | 2024 |
| Infinity Jewellery London Ltd | Wholesale & retail | 2024 |
| Infinity Ocean Ltd | Wholesale & retail | 2020 |
| Infinity Photo Studios Limited | Professional & scientific | 2022 |
| Infinity SOL Ltd | Wholesale & retail | 2019 |
| Infinity Travel and Tours Limited | Administrative & support | 2023 |
| Infinity Ways Limited | Information & communication | 2019 |
| Infinity Ways Services Ltd | Other services | 2020 |
| Infinity&Co Ltd | Wholesale & retail | 2025 |
| Infinix Accountants Limited | Professional & scientific | 2015 |
| Infinix Limited | Wholesale & retail | 2023 |
| Infinix Trading Ltd | Wholesale & retail | 2022 |
| Inflatable Investments Limited | Arts & recreation | 2017 |
| Inflex Solutions Limited | Information & communication | 2017 |
| Infobd(Pvt) Limited | Wholesale & retail | 2019 |
| Infocom IT (UK) Ltd | Wholesale & retail | 2008 |
| Infocompute Systems Ltd | Information & communication | 2014 |
| Infodsj Limited | Wholesale & retail | 2025 |
| Infomac Solutions Limited | Information & communication | 2015 |
| Infomart IT Solutions Limited | Information & communication | 2003 |
| Informatica Consultancy Services Limited | Information & communication | 2009 |
| Informatica Solutions Limited | Information & communication | 2025 |
| Infosol IT Solutions Ltd | Information & communication | 2018 |
| Infotec Consultancy Ltd | Information & communication | 2011 |
| Infotech Moguls Ltd | Information & communication | 2021 |
| Infracomm Ltd | Information & communication | 2011 |
| Infragent AI Limited | Information & communication | 2026 |
| Infuso Yorks Ltd | Wholesale & retail | 2025 |
| Infynix Solutions Ltd | Information & communication | 2025 |
| Ingenious Decisions Ltd | Information & communication | 2017 |
| Ingenious Education Limited | Education | 2022 |
| Ingenium Software Ltd | Information & communication | 2025 |
| Inglehurst Dental Practice Ltd | Health & social care | 2011 |
| Inhaus Investments Ltd | Real estate | 2020 |
| Inhouse 1 Office Ltd | Real estate | 2022 |
| Inhouse 4 Office Solutions Ltd | Real estate | 2019 |
| Initial Occupational Therapy Ltd | Health & social care | 2018 |
| Initial Task Services Ltd | Real estate | 2025 |
| INK2DESIGN Limited | Administrative & support | 2002 |
| Inkit Ltd | Information & communication | 2024 |
| Inkst Limited | Real estate | 2025 |
| Innfiniti Properties Limited | Real estate | 2023 |
| Innlix Ltd | Information & communication | 2011 |
| Innolabs Ltd | Information & communication | 2016 |
| Innoliving Ltd | Real estate | 2025 |
| Innotech Advisory Ltd | Real estate | 2019 |
| INNOV8 Care Ltd | Health & social care | 2023 |
| Innova Trade UK Ltd | Wholesale & retail | 2020 |
| Innovate Academy London Ltd | Education | 2024 |
| Innovate Build Ltd | Construction | 2020 |