| Idle Spice HUT Ltd | Hospitality | 2024 |
| Idle Village Store Ltd | Wholesale & retail | 2025 |
| Idris Khan Holding Limited | Financial services | 2024 |
| Idris Pharmacare Ltd | Health & social care | 2020 |
| Ietem Ltd | Real estate | 2024 |
| Iexel Education Trust | Education | 2011 |
| IF NOT by Luck Ltd | Professional & scientific | 2022 |
| Iferans Limited | Transport & logistics | 2026 |
| Iffat Fatima Ltd | Wholesale & retail | 2025 |
| Ifka Property Consultant Ltd | Real estate | 2022 |
| Ifrah Locums Ltd | Health & social care | 2024 |
| Ifthenelsedo Ltd | Information & communication | 2023 |
| Ifti G Ltd | Construction | 2024 |
| IG Yorks Ltd | Other services | 2024 |
| IGC Services Limited | Financial services | 2021 |
| Igcap Finance Limited | Financial services | 2025 |
| Ignite GAS Care Limited | Construction | 2011 |
| Ignite GAS Holdings Limited | Financial services | 2016 |
| Ignite Online School Ltd | Education | 2026 |
| IGY Leeds Ltd | Hospitality | 2026 |
| IH 84 Ltd | Administrative & support | 2023 |
| IH Logistics Group Limited | Transport & logistics | 2025 |
| IH Ventures Ltd | Real estate | 2025 |
| IHA Care Ltd | Health & social care | 2026 |
| Ihdf Limited | Health & social care | 2017 |
| Ihhm Ltd | Wholesale & retail | 2015 |
| Ihire Cars West Yorkshire Ltd | Transport & logistics | 2019 |
| Ihsaan Homes Ltd | Real estate | 2026 |
| Ihsaan Therapeutic Services CIC | Professional & scientific | 2022 |
| Ihtsham a Ltd | Administrative & support | 2015 |
| Ihya College | Education | 2022 |
| Ihzh Properties Ltd | Real estate | 2020 |
| IIJ Properties Ltd | Real estate | 2024 |
| Iilaam Ltd | Professional & scientific | 2024 |
| Iiyna Ltd | Wholesale & retail | 2023 |
| IJ Fast Logistics Ltd | Transport & logistics | 2017 |
| Ijaz and Sons Investment Ltd | Real estate | 2024 |
| Ijaz Halal Poultry Ltd | Wholesale & retail | 2014 |
| IJB Plumbing & Heating Contractors Limited | Construction | 2017 |
| Ijcop Ltd | Professional & scientific | 2018 |
| IJS Therapists Limited | Health & social care | 2019 |
| IK Auto Parts Ltd | Wholesale & retail | 2024 |
| IK Cloud Data Ltd | Information & communication | 2026 |
| IK Cloud Technologies Ltd | Information & communication | 2026 |
| IK Flooring Ltd | Wholesale & retail | 2025 |
| IK Innovations Ltd | Wholesale & retail | 2025 |
| IK Properties Bradford Ltd | Real estate | 2024 |
| IK School of Fine Tailoring CIC | Education | 2024 |
| IK Solutions Ltd | Real estate | 2025 |
| Ikare Ltd | Professional & scientific | 2019 |
| IKH Performance Ltd | Wholesale & retail | 2024 |
| Ikhaa Trading & Investment Limited | Professional & scientific | 2026 |
| Ikhan Ltd | Health & social care | 2017 |
| Ikhhb Ltd | Wholesale & retail | 2025 |
| Ikhifa Social, Humanitarian & Educational C.I.C. | Wholesale & retail | 2025 |
| Ikhlaas Consulting Ltd | Professional & scientific | 2018 |
| IKJ Imperial Joinery Ltd | Construction | 2018 |
| Ikleel Legal Ltd | Professional & scientific | 2025 |
| IKM Traders Ltd | Wholesale & retail | 2025 |
| Ikra Kiron Ltd | Wholesale & retail | 2026 |
| Ikram ALI Ltd | Wholesale & retail | 2026 |
| Ikram Motoring &House Group Ltd | Construction | 2025 |
| Ikramfashion Ltd | Wholesale & retail | 2020 |
| Iksh BFD Ltd | Wholesale & retail | 2026 |
| Iksi Properties Ltd | Real estate | 2026 |
| Ikska Limited | Transport & logistics | 2025 |
| Iktv Productions Ltd | Information & communication | 2018 |
| IKY (UK) Ltd | Hospitality | 2018 |
| IL Bebo's Woodgreen Ltd | Hospitality | 2018 |
| ILA Medical Ltd | Health & social care | 2023 |
| Ilas Enterprise Limited | Administrative & support | 2008 |
| Ilaw Legal Consultancy Limited | Professional & scientific | 2026 |
| Ilearn Driving Ltd | Education | 2025 |
| Iles Floorcare Limited | Extraterritorial | 1972 |
| Iles Glassware Limited | Extraterritorial | 1931 |
| Iles Hygiene Supplies Limited | Extraterritorial | 1990 |
| Iles Waste Systems Limited | Extraterritorial | 1990 |
| Ilinkx Ltd | Manufacturing | 2025 |
| Ilkley Brickwork Ltd | Construction | 2020 |
| Ilkley Technology Solutions Ltd | Information & communication | 2025 |
| Illingworth Accountants Limited | Professional & scientific | 2020 |
| Illuminate and Dine Limited | Hospitality | 2016 |
| Illustrative Design & Co Ltd | Arts & recreation | 2018 |
| ILM Consultant Services Ltd | Professional & scientific | 2017 |
| Ilm-Ornate Lane Ltd | Information & communication | 2013 |
| Ilmvac (UK) Ltd | Professional & scientific | 1999 |
| Ilyas Properties (Yorkshire) Limited | Real estate | 2024 |
| Ilys Gents Studio Ltd | Other services | 2020 |
| IM & MM Property Investments Ltd | Real estate | 2022 |
| IM Franchise Limited | Professional & scientific | 2024 |
| IM Kitchen Limited | Financial services | 2026 |
| IM Travel Agency Ltd | Administrative & support | 2017 |
| IM Turner Holdings Limited | Extraterritorial | 2011 |
| IMA UK Reports Ltd | Professional & scientific | 2023 |
| Imaan Capital Limited | Real estate | 2012 |
| Imaan Halal Meat Ltd | Wholesale & retail | 2020 |
| Imaanz Beauty Academy Ltd | Other services | 2019 |
| Imac Services Limited | Other services | 2016 |
| Image Arts Limited | Extraterritorial | 1963 |
| Image Systems Limited | Information & communication | 1998 |