| IP Cars Ltd | Wholesale & retail | 2016 |
| IPK Limited | Construction | 2025 |
| IQ Bowsers Ltd | Water & waste | 2025 |
| IQ Delivery Limited | Transport & logistics | 2024 |
| Iqbal Independent Traders Ltd | Wholesale & retail | 2025 |
| Iqbal Motors Bedford Limited | Wholesale & retail | 2026 |
| Iridium Services MK Ltd | Wholesale & retail | 2022 |
| Iris Crest Limited | Other services | 2026 |
| Iroonoak Ltd | Administrative & support | 2025 |
| Iros & I Limited | Real estate | 2022 |
| Irvineering Ltd | Professional & scientific | 2015 |
| Irvins Limited | Professional & scientific | 1998 |
| Irwin and Simpson (Lettings) Limited | Real estate | 2017 |
| Isaac Mccullough Music Ltd | Arts & recreation | 2025 |
| Isabelle Property Holdings Ltd | Real estate | 2022 |
| ISC Construction Ltd | Construction | 2025 |
| ISF International Ltd. | Manufacturing | 2019 |
| ISH Capital Estates Ltd | Real estate | 2025 |
| ISI Afro Caribbean Foods Ltd | Wholesale & retail | 2023 |
| ISK Consulting Ltd | Professional & scientific | 2022 |
| Isla Steel Limited | Construction | 2025 |
| Isla Viaan Ltd | Hospitality | 2022 |
| Islamcinematics Ltd | Professional & scientific | 2025 |
| Island Clay Ltd | Professional & scientific | 2011 |
| Island Harvests UK Limited | Wholesale & retail | 2025 |
| Islanders Media CIC | Information & communication | 2021 |
| Isle of Eden Limited | Real estate | 2024 |
| Issa Screen Acting Ltd | Education | 2026 |
| Issaq Trading Ltd | Wholesale & retail | 2023 |
| Istanbul Bedford Ltd | Wholesale & retail | 2023 |
| Istanbul Mega Market Limited | Wholesale & retail | 2023 |
| IT Anita Ltd | Wholesale & retail | 2014 |
| IT Connections (Holdings) Limited | Professional & scientific | 2000 |
| IT Connections Limited | Information & communication | 1996 |
| It's a Wrapp Ltd | Wholesale & retail | 2026 |
| Ital Homes Limited | Real estate | 1992 |
| Italia Fashion House Ltd | Wholesale & retail | 2019 |
| Italian Express (Bedford) Limited | Hospitality | 2017 |
| Italian Food Traders Limited | Wholesale & retail | 2015 |
| Italiano Foods & Wines Ltd | Hospitality | 2015 |
| Ithaca EPC Ltd | Professional & scientific | 2023 |
| Itheon Limited | Information & communication | 1987 |
| Itherme Limited | Construction | 2015 |
| ITI Entertainment Ltd | Hospitality | 2019 |
| ITS My Colour Limited | Other services | 2009 |
| Itsalwayshana Ltd | Arts & recreation | 2019 |
| Itssl Limited | Information & communication | 2015 |
| Itura Homes Ltd | Professional & scientific | 2018 |
| It’S Nacho Business Ltd | Hospitality | 2022 |
| IV Cars Ltd | Wholesale & retail | 2026 |
| Ivanpark UK Limited | Construction | 2012 |
| IVN Events Ltd | Hospitality | 2026 |
| Ivory Hair Boutique Ltd | Other services | 2017 |
| Ivory Media Ltd | Administrative & support | 2022 |
| IVY & Monarch Ltd | Manufacturing | 2022 |
| IVY Farm Barns Management Company Limited | Households | 2021 |
| IWS Investments Ltd | Real estate | 2006 |
| Ixfourvi Investment Group Ltd | Extraterritorial | 2019 |
| Iyet HR Consultancy Ltd | Professional & scientific | 2014 |
| IZI Limited | Construction | 2025 |
| J & a Display Limited | Professional & scientific | 2011 |
| J & B Civils Ltd | Construction | 2025 |
| J & C Mags PVT Ltd | Health & social care | 2014 |
| J & C Ormerod Limited | Administrative & support | 2020 |
| J & E Gardens Ltd | Administrative & support | 2025 |
| J & J Janitorial Services Ltd | Wholesale & retail | 2011 |
| J & J Services GB Ltd | Wholesale & retail | 2008 |
| J & K Recovery (Tingrith) Limited | Professional & scientific | 1996 |
| J & K Recovery Limited | Transport & logistics | 1993 |
| J & N Family Choice Ltd | Wholesale & retail | 2024 |
| J & R Bhakar Estates Ltd | Real estate | 2019 |
| J & V Partners Ltd | Hospitality | 2025 |
| J & W Properties Limited | Real estate | 2007 |
| J a P Sound Limited | Administrative & support | 2005 |
| J Aesthetics and Beauty Ltd | Other services | 2021 |
| J Albone Bricklaying Contractors Limited | Construction | 2004 |
| J Aujla Financial Consultancy Limited | Professional & scientific | 2024 |
| J B Domestic Limited | Manufacturing | 2010 |
| J B Events Ltd | Other services | 2025 |
| J Barber Motor Repairs Ltd | Wholesale & retail | 2019 |
| J Bayliss Consulting Ltd | Professional & scientific | 2017 |
| J C a Packaging Limited | Wholesale & retail | 2004 |
| J Child Mechanical Plumbing GAS Ltd | Construction | 2014 |
| J D Equestrian Services Limited | Extraterritorial | 2000 |
| J Dean Security Services Limited | Administrative & support | 2011 |
| J E B Aviation Limited | Professional & scientific | 2021 |
| J F Embla Limited | Administrative & support | 2024 |
| J F I C Limited | Financial services | 2024 |
| J Foster Engineering Ltd | Professional & scientific | 2023 |
| J G Construction & Landscaping Ltd | Administrative & support | 2025 |
| J J Electronics Limited | Manufacturing | 1981 |
| J K Ubhi Ltd | Health & social care | 2010 |
| J Khatun Ltd | Health & social care | 2026 |
| J Lawton Carpentry Limited | Construction | 2016 |
| J M Contractors Limited | Construction | 2007 |
| J Moore Haulage Limited | Transport & logistics | 2020 |
| J N K Logistic Ltd | Transport & logistics | 2016 |
| J R General Building Ltd | Construction | 2022 |
| J S Express Ltd | Manufacturing | 2018 |
| J S Foster Consultancy Ltd | Education | 2025 |