| Infinity Stores Ltd | Wholesale & retail | 2018 |
| Infinity Supplyer Limited | Wholesale & retail | 2026 |
| Infinity Tech Ltd | Information & communication | 2017 |
| Infinity Trader Ltd | Wholesale & retail | 2025 |
| Infinity Uprisen Ltd | Administrative & support | 2024 |
| Infinityglobaluk Ltd | Wholesale & retail | 2020 |
| Infinitytechno Ltd | Extraterritorial | 2023 |
| Infixion Asset Holdings (UK) Ltd | Financial services | 2019 |
| Inflection Capital Ltd | Financial services | 2021 |
| Influential Estates Limited | Real estate | 2025 |
| Info Credence Limited | Information & communication | 2019 |
| Info Exergy Ltd | Information & communication | 2008 |
| Info Technology Supply Limited | Information & communication | 1988 |
| Infoalgo Limited | Wholesale & retail | 2023 |
| Infocepts Limited | Information & communication | 2024 |
| Infohealth Holdings Limited | Professional & scientific | 2008 |
| Infohealth Limited | Manufacturing | 2000 |
| Infohealth Property Limited | Real estate | 2016 |
| Infolabs Consulting Ltd | Information & communication | 2011 |
| Infomatrixoneview Limited | Professional & scientific | 2017 |
| Infopartners Ltd | Professional & scientific | 2014 |
| Infoprop Limited | Information & communication | 2011 |
| Inform Construction Ltd | Construction | 2020 |
| Informatics Software International Limited | Information & communication | 2009 |
| Information and Network Services Ltd | Administrative & support | 2011 |
| Infosite Technologies Limited | Information & communication | 2006 |
| Infostream Consulting Ltd | Information & communication | 2021 |
| Infosys Properties Ltd | Construction | 2024 |
| Infotech Evolution Limited | Information & communication | 2011 |
| Infrastruxta IT Ltd | Information & communication | 2024 |
| Infraxo Limited | Information & communication | 2025 |
| Infuse Creations Limited | Wholesale & retail | 2023 |
| Ingenious Accountancy Ltd | Professional & scientific | 2021 |
| Ingenious Consultants Limited | Professional & scientific | 2018 |
| Ingenious Management Limited | Professional & scientific | 2009 |
| Ingenious Minds Ltd | Extraterritorial | 2011 |
| Inglebys Limited | Wholesale & retail | 1996 |
| Inglewood Construction Ltd | Construction | 2019 |
| Inieos Ltd | Real estate | 2025 |
| Initeris Enterprise Ltd | Administrative & support | 2016 |
| Inition Digital Ltd | Information & communication | 2019 |
| Initium Limited | Construction | 2021 |
| Inixi Limited | Information & communication | 2008 |
| Injury Claims Advice Bureau Ltd | Financial services | 2001 |
| INK Property Services Ltd | Households | 2024 |
| Inkog Ltd | Manufacturing | 2025 |
| Inky Barbers Ltd | Other services | 2024 |
| Inky Magpie Co Ltd | Other services | 2013 |
| Inmode Consulting Services Limited | Information & communication | 2013 |
| Inmorphis Services Limited | Information & communication | 2022 |
| Inner Circle Investments Ltd | Administrative & support | 2015 |
| Inner Circle Sports Management Limited | Arts & recreation | 2023 |
| Inner Core Solutions Ltd | Information & communication | 2013 |
| Inner Harmony Space Limited | Other services | 2024 |
| Innersightai Ltd | Information & communication | 2026 |
| Innes Redmond Ltd | Wholesale & retail | 2018 |
| Innoassist Limited | Health & social care | 2009 |
| Innocare Limited | Health & social care | 2003 |
| Innodev Limited | Information & communication | 2025 |
| Innolab IT Ltd | Information & communication | 2023 |
| Innomary Limited | Health & social care | 2013 |
| Innomarydom Limited | Health & social care | 2014 |
| Innopass Ltd | Professional & scientific | 2012 |
| Innotatzit Ltd | Information & communication | 2024 |
| Innova Property Holdings Ltd | Real estate | 2019 |
| Innova Training Ltd | Education | 2023 |
| Innovate Accounting Limited | Professional & scientific | 2026 |
| Innovatech Solutions Ltd | Information & communication | 2023 |
| Innovative Ageing Limited | Professional & scientific | 2017 |
| Innovative Endodontics Limited | Health & social care | 2022 |
| Innovative Humans Limited | Professional & scientific | 2013 |
| Innovative Pharma Limited | Health & social care | 2014 |
| Innovative Project Solutions Ltd | Information & communication | 2019 |
| Innovative Recruitment Solutions Ltd | Administrative & support | 2024 |
| Innoventis Limited | Information & communication | 2025 |
| Innovest Limited | Construction | 2017 |
| Innovizr Limited | Professional & scientific | 2009 |
| Innowise Limited | Manufacturing | 2018 |
| Inovo Group Ltd. | Professional & scientific | 2018 |
| Inovo Rail Limited | Professional & scientific | 2019 |
| Inovus Healthcare Limited | Health & social care | 2024 |
| Inpowered House Ltd | Education | 2026 |
| Inpropea Limited | Real estate | 2021 |
| Inrecon Limited | Professional & scientific | 2014 |
| Inscatech Limited | Professional & scientific | 2025 |
| Inside Builders Ltd | Construction | 2020 |
| Inside Influence Limited | Professional & scientific | 2019 |
| Insight Consultancy and Research (ICR) Limited | Wholesale & retail | 2017 |
| Insight Marketing Group Limited | Other services | 2024 |
| Insight Opticians Limited | Health & social care | 2002 |
| Insight Property Consultancy Limited | Professional & scientific | 2016 |
| Insight Residential Management Limited | Households | 2021 |
| Insight Scope Ltd | Professional & scientific | 2020 |
| INSIGHT2DATA Ltd | Information & communication | 2021 |
| Insightcraft Solutions Limited | Information & communication | 2025 |
| Insights Expert Ltd | Real estate | 2014 |
| Insightstap Solutions Limited | Information & communication | 2026 |
| Insignia Housing CIC | Health & social care | 2025 |
| Insignia Ventures Ltd | Real estate | 2022 |
| Inso PAN Asian Northwood Ltd | Hospitality | 2026 |