| Hydrocquel Ltd | Extraterritorial | 2011 |
| Hygeniq Solutions Ltd | Administrative & support | 2019 |
| Hyperactive Developments Limited | Information & communication | 2015 |
| Hypnotherapy Ltd | Other services | 2015 |
| Hyspec Carpentry and Construction Ltd | Construction | 2013 |
| HZA Barbers Ltd | Other services | 2026 |
| I & R Consulting Ltd | Administrative & support | 2017 |
| I a E Ltd. | Manufacturing | 1996 |
| I DO Pilates Ltd | Education | 2019 |
| I M Rogers Joinery Limited | Construction | 2003 |
| I P Engineering (UK) Ltd | Manufacturing | 2011 |
| I Want Limited | Wholesale & retail | 2020 |
| I'Man Barbers Ltd | Other services | 2023 |
| I-Fit Golf Limited | Extraterritorial | 2023 |
| I.A Telecoms Ltd | Information & communication | 2018 |
| I.D Ventures Group Ltd | Financial services | 2026 |
| I.Prep Systems Ltd | Professional & scientific | 2021 |
| IAG Games Ltd | Information & communication | 2015 |
| IAI Holdings Ltd | Real estate | 2021 |
| Iain Dobson Ltd | Professional & scientific | 2011 |
| IAJ Consulting Limited | Information & communication | 2014 |
| Iamathlete Limited | Health & social care | 2010 |
| IAN Brookes Rail Consulting Limited | Transport & logistics | 2011 |
| IAS Trans Limited | Transport & logistics | 2022 |
| Ibak Pharma Ltd | Health & social care | 2018 |
| Ibara Services Limited | Professional & scientific | 2019 |
| IBC Franchising Limited | Financial services | 2010 |
| Ibechems Limited | Health & social care | 2025 |
| Ibisal Ltd | Transport & logistics | 2024 |
| Ibrahimacare Limited | Health & social care | 2020 |
| Ibts Limited | Information & communication | 2001 |
| IC Advisory Ltd | Professional & scientific | 2021 |
| IC Bedford Limited | Information & communication | 2024 |
| IC Utility Solutions Ltd | Information & communication | 2026 |
| ICC Managed Services Limited | Information & communication | 2010 |
| ICC Northern UK Ltd | Other services | 2004 |
| Icc-Uk Limited | Wholesale & retail | 2009 |
| Ice Coffee Limited | Hospitality | 2025 |
| Ice Integrated Clinical Excellence Limited | Health & social care | 2010 |
| Ice-Scan Limited | Other services | 2012 |
| ICF Constrcution Limited | Construction | 2026 |
| ICG Global Limited | Administrative & support | 2017 |
| Icknield Way Baldock Management Company Limited | Households | 2006 |
| Icleanuk Limited | Administrative & support | 2014 |
| Icon Bespoke Joinery Ltd | Construction | 2025 |
| Icon Finserv Ltd | Financial services | 2026 |
| Icon Mortgage Associates Ltd | Financial services | 2023 |
| Iconic Kits Ltd | Wholesale & retail | 2020 |
| Iconic Roofing Solutions Ltd | Construction | 2024 |
| Icore Digital Limited | Professional & scientific | 2020 |
| ICP Vintage Audio Visual Limited | Wholesale & retail | 2021 |
| Icustomgolf Limited | Wholesale & retail | 2010 |
| Idea Cellar Limited | Information & communication | 2016 |
| Ideal Building and Carpentry Limited | Construction | 2009 |
| Ideal Rendering Solutions Ltd | Construction | 2021 |
| Ideal Stoves Ltd | Wholesale & retail | 2015 |
| Idealconnect Services Limited | Wholesale & retail | 2022 |
| Idealet Ltd | Households | 2018 |
| Idinex Ltd | Information & communication | 2025 |
| Idkb Limited | Professional & scientific | 2021 |
| IDN Contractors Ltd | Construction | 2015 |
| Idol Fusion Ltd | Wholesale & retail | 2025 |
| Ievau Ltd | Construction | 2022 |
| Iewc UK & Ireland Ltd. | Wholesale & retail | 1992 |
| Ifan Ltd | Construction | 2020 |
| IFL Haulage Ltd | Transport & logistics | 2013 |
| IGA Bedford Ltd | Hospitality | 2023 |
| Igloo Sweets Ltd | Wholesale & retail | 2023 |
| Ignite Coaching Group Ltd | Other services | 2026 |
| Ignite Project Solutions Ltd | Information & communication | 2023 |
| Ignite YOU Coaching Limited | Professional & scientific | 2025 |
| IGR Services Ltd | Information & communication | 2018 |
| Iiehservices Ltd | Financial services | 2021 |
| Iieta Ltd | Other services | 2020 |
| IJ Tiler Services Ltd | Construction | 2022 |
| IJC Carpentry and Building Limited | Construction | 2026 |
| IK Bedford Ltd | Transport & logistics | 2025 |
| IKM Network Communications Limited | Information & communication | 1994 |
| Ikmob Ltd | Construction | 2025 |
| Iles Systems Ltd. | Information & communication | 1997 |
| Ilgrose Ltd | Real estate | 2024 |
| Ilikestores Limited | Wholesale & retail | 2014 |
| Iliketosell Ltd | Wholesale & retail | 2008 |
| Ilovevapour Ltd | Wholesale & retail | 2012 |
| ILV Ltd | Wholesale & retail | 2018 |
| Image for Life Limited | Wholesale & retail | 2011 |
| Imaginary PUB FOX & Hounds Riseley Ltd | Hospitality | 2022 |
| Imaginary PUB Ltd | Hospitality | 2021 |
| Imaginators.Tv Ltd | Arts & recreation | 2025 |
| Imahami Limited | Real estate | 2025 |
| Imaldi ERP Projects Ltd | Information & communication | 2025 |
| Imam Al-Jazari Academy Ltd | Education | 2026 |
| IMC Accounting Ltd | Professional & scientific | 2026 |
| Imica Limited | Information & communication | 2012 |
| Immaculate Services Ltd | Real estate | 2018 |
| Immerse Care Ltd | Administrative & support | 2022 |
| Immersun Ltd | Professional & scientific | 2015 |
| Immigration Resolution Services Limited | Professional & scientific | 2023 |
| Impact Electrical & Security Systems Limited | Construction | 2019 |
| Impact FM Ltd | Professional & scientific | 2021 |