| Indy DAS Ltd | Administrative & support | 2019 |
| Ineele Limited | Information & communication | 2014 |
| Infacare Ltd | Manufacturing | 2025 |
| Infallibletech Ltd | Information & communication | 2025 |
| Infant Shrine Limited | Health & social care | 2013 |
| Infigo Partners Limited | Real estate | 2011 |
| Infinite Beauty by Rahat Ltd | Other services | 2019 |
| Infinite Capital Management Ltd | Real estate | 2017 |
| Infinite Legends Events Ltd | Arts & recreation | 2025 |
| Infinite Property Solutions GB Ltd | Households | 2025 |
| Infinity & General Services Ltd | Professional & scientific | 2023 |
| Infinity Build & Interiors Ltd | Construction | 2025 |
| Infinity Builders Limited | Construction | 2021 |
| Infinity Global Services Limited | Education | 2023 |
| Infinity Global Sports Management Ltd | Arts & recreation | 2025 |
| Infinity Hopkins Ltd | Construction | 2022 |
| Infinity Hub Anglia Ltd | Hospitality | 2025 |
| Infinity Hub Direct Ltd | Wholesale & retail | 2022 |
| Infinity Marketing Network Ltd | Other services | 2025 |
| Infinity Portfolio Ltd | Real estate | 2017 |
| Infinity Top Services Ltd | Transport & logistics | 2021 |
| Infinity World Ltd | Construction | 2023 |
| Influencr Co Ltd | Professional & scientific | 2025 |
| Info Yours Stay Limited | Professional & scientific | 2024 |
| Info@Your Stay (UK) Ltd | Administrative & support | 2023 |
| Informatica (IT) Ltd | Information & communication | 2025 |
| Informative Technologies Limited | Information & communication | 2006 |
| Infoskills Ltd | Information & communication | 2025 |
| Infospring Limited | Information & communication | 2001 |
| Infostrive Technologies Limited | Information & communication | 2004 |
| Infotainment Limited | Information & communication | 1989 |
| Infotech Consult Ltd | Information & communication | 2019 |
| Ingenuity Tutoring Limited | Education | 2020 |
| Ingineru Limited | Transport & logistics | 2015 |
| Ingleton Contract Cleaning Services Ltd | Administrative & support | 2021 |
| Ingleton Holdings Limited | Construction | 2018 |
| Ingleton Luxury Homes City Apartments Limited | Construction | 2018 |
| Ingleton Luxury Homes the Boulevards Limited | Construction | 2017 |
| Ingleton Luxury Homes the Lawns Limited | Real estate | 2018 |
| Ingleton Luxury Rentals City Apartments Limited | Real estate | 2022 |
| Ingleton Luxury Rentals Lawns Court Limited | Real estate | 2020 |
| Ingleton Luxury Rentals Limited | Real estate | 2019 |
| Ingleton Property Ltd | Construction | 2014 |
| Inglewood Developments Limited | Households | 1990 |
| Ingrebourne Day Nursery Limited | Health & social care | 2002 |
| INI Alase Services Limited | Manufacturing | 2025 |
| Injenai Ltd | Information & communication | 2026 |
| Inkredible Ideas CIC | Education | 2026 |
| INKSPIRE11 Ltd | Wholesale & retail | 2025 |
| INL Group Ltd | Professional & scientific | 2022 |
| Inline Accounts Limited | Professional & scientific | 2017 |
| Inna Care Ltd | Administrative & support | 2016 |
| Inna Freight Limited | Transport & logistics | 2018 |
| Inna Medisync Limited | Wholesale & retail | 2026 |
| Inna Property Management Ltd | Real estate | 2020 |
| Inndata UK Limited | Information & communication | 2026 |
| Inner Drive Motors Ltd | Wholesale & retail | 2023 |
| Inner EYE Group Ltd | Information & communication | 2024 |
| Inner London Cleaning Ltd. | Administrative & support | 2009 |
| Inner Media Travel and Production Services Limited | Wholesale & retail | 2021 |
| Innertransitions Ltd | Professional & scientific | 2026 |
| Innna Ltd | Wholesale & retail | 2024 |
| Innosens International Ltd | Professional & scientific | 2022 |
| Innova Facilities Management Ltd | Administrative & support | 2021 |
| Innovate Property Holdings Ltd | Real estate | 2025 |
| Innovate Transport UK Ltd | Transport & logistics | 2018 |
| Innovation Business Support Ltd | Professional & scientific | 2025 |
| Innovation Events Management Limited | Arts & recreation | 2006 |
| Innovation Events Mgmt Ltd | Arts & recreation | 2020 |
| Innovation in Security Solutions Limited | Administrative & support | 2025 |
| Innovative Care & Digital Skills CIC | Public administration | 2025 |
| Innovative Limited | Professional & scientific | 2021 |
| Innovative Trading Solutions Ltd. | Information & communication | 2007 |
| Innovativeitech Ltd | Information & communication | 2024 |
| Innovatix LAB Ltd | Information & communication | 2025 |
| Innygroup Limited | Real estate | 2013 |
| Inoma Holdings Limited | Professional & scientific | 2022 |
| Inseries Ltd | Information & communication | 2024 |
| Insha Annex Limited | Wholesale & retail | 2025 |
| Insight Construction Limited | Construction | 2018 |
| Insight Security Ltd | Administrative & support | 2022 |
| Insight Tax Ltd | Professional & scientific | 2024 |
| Insightiq Analytics Ltd | Information & communication | 2025 |
| Insightreview Consultancy Limited | Professional & scientific | 2023 |
| Insoldata Ltd | Information & communication | 2024 |
| Insource Studios Limited | Professional & scientific | 2018 |
| Insparkly Limited | Wholesale & retail | 2021 |
| Inspiration Social Care Ltd | Health & social care | 2017 |
| Inspirative Consultancy Ltd | Real estate | 2020 |
| Inspire ABA Ltd | Education | 2023 |
| Inspire ALL to Train Ltd | Education | 2018 |
| Inspire Children & YP Services Ltd | Health & social care | 2022 |
| Inspire Education Academy Ltd | Education | 2021 |
| Inspire Growth Services Ltd | Health & social care | 2018 |
| Inspire O&M Estates Ltd | Real estate | 2026 |
| Inspire Recruitment & Training Ltd | Other services | 2017 |
| Inspire Social Work International Ltd | Health & social care | 2021 |
| Inspired Builders Limited | Real estate | 2021 |
| Inspired Muslim Women Ltd | Education | 2022 |
| Inspiring Minds Therapeutic Services Limited | Health & social care | 2025 |