| Imperial Properties Solutions Ltd | Construction | 2023 |
| Impulse Advertising & Events Ltd. | Professional & scientific | 2021 |
| IN Situ Repairs Ltd | Other services | 2019 |
| Indepex Ltd | Health & social care | 2026 |
| Indie C Holdings Ltd | Real estate | 2020 |
| Indojama Ltd | Administrative & support | 2022 |
| Inex Lettings Ltd | Real estate | 2019 |
| Infinite Stock Ltd | Wholesale & retail | 2025 |
| Infinity 2016 (Holdings) Limited | Real estate | 2016 |
| Infinity Booze Ltd | Wholesale & retail | 2020 |
| Infinity Cash and Carry Ltd | Wholesale & retail | 2023 |
| Infinity Interpreting & Translation Ltd | Professional & scientific | 2017 |
| Infinox Vape Ltd | Wholesale & retail | 2025 |
| Infranexaltd Ltd | Wholesale & retail | 2026 |
| Innodesign Ltd | Manufacturing | 2026 |
| Innovative Decorating Solutions Ltd | Construction | 2018 |
| Inspire Vision Ltd | Professional & scientific | 2023 |
| Inspiro Capital Holdings Ltd | Real estate | 2022 |
| Inspiro Tuition Academy Ltd | Education | 2017 |
| Inspiro Tuition Online Ltd | Education | 2021 |
| Integral Health Limited | Administrative & support | 2023 |
| Intelligentyou Limited | Education | 2016 |
| Intent Forms Ltd | Information & communication | 2025 |
| Intentional Living Properties Ltd | Real estate | 2026 |
| Intequity Limited | Real estate | 2019 |
| International Glazing Supplies Ltd | Wholesale & retail | 2025 |
| International Ideas Importer Limited | Wholesale & retail | 2023 |
| Interveshen Construct Ltd | Construction | 2025 |
| Intrusion Alarms Limited | Administrative & support | 2015 |
| Invtech Limited | Information & communication | 2025 |
| IPO Tech Ltd | Information & communication | 2020 |
| Irimea Renovations Ltd | Construction | 2025 |
| Irsa Logistics Ltd | Transport & logistics | 2025 |
| Isabel PER SP Ltd | Information & communication | 2025 |
| ISC Properties Ltd | Real estate | 2025 |
| Istanbul Shawarma Cape Hill UK Limited | Hospitality | 2019 |
| Iuliku Nail Academy Ltd | Other services | 2019 |
| IVY Properties BG Ltd | Real estate | 2023 |
| Izna Limited | Health & social care | 2025 |
| J and R Halal Meat 1 Limited | Manufacturing | 2019 |
| J Clarke Solutions Ltd | Construction | 2026 |
| J D Interior (UK1) Limited | Manufacturing | 2018 |
| J Ents Ltd | Hospitality | 2021 |
| J J Civil Construction Ltd | Construction | 2023 |
| J K Property Group Limited | Real estate | 2018 |
| J K Shaping Ltd | Construction | 2023 |
| J M Events WM Ltd | Arts & recreation | 2023 |
| J Moult Electrical Ltd | Manufacturing | 2018 |
| J Multiple Workers Ltd. | Construction | 2016 |
| J S Lehal Services Limited | Other services | 2019 |
| J Turner Upholstery Ltd | Other services | 2017 |
| J&K Doors and Windows Ltd | Construction | 2025 |
| J&M Roofing Ltd | Construction | 2007 |
| J&Sons Properties Limited | Real estate | 2022 |
| J.M.E Driveforce Ltd | Transport & logistics | 2016 |
| J.S.Claims Limited | Administrative & support | 2023 |
| JA One Construction Ltd | Construction | 2024 |
| Jack Leverton Ltd | Information & communication | 2026 |
| Jacksons Catering Co. Limited | Wholesale & retail | 2001 |
| Jacksparkles Ltd | Administrative & support | 2022 |
| Jacob & Jones Group Ltd | Wholesale & retail | 2018 |
| JAD Extension Ltd | Professional & scientific | 2025 |
| Jagjit Singh Ltd | Construction | 2020 |
| Jalaeri Properties Ltd | Real estate | 2025 |
| Jalal & Sons Limited | Health & social care | 2008 |
| Jalal Foods Limited | Manufacturing | 2012 |
| Jamaica Paradise Ltd | Hospitality | 2018 |
| Jami Masjid and Bangladeshi Islamic Centre Smethwick Limited | Administrative & support | 2008 |
| Jamizon Ltd | Wholesale & retail | 2025 |
| Jammu Construction SPL Ltd | Construction | 2026 |
| Jammu Logistics Limited | Transport & logistics | 2025 |
| Janny's Ltd | Hospitality | 2026 |
| Januka Catering Limited | Hospitality | 2025 |
| JAP Hybrid Ltd | Wholesale & retail | 2023 |
| Japcourier Limited | Wholesale & retail | 2023 |
| JAS Panesar Ltd | Construction | 2024 |
| Jason Transport Solutions Ltd | Transport & logistics | 2019 |
| Jasper Real Estates Limited | Real estate | 2026 |
| Jatt Logistics Limited | Transport & logistics | 2015 |
| JAV Autos Limited | Wholesale & retail | 2024 |
| Javid Sediqi Ltd | Wholesale & retail | 2023 |
| Jawed Akhter Trading Company Limited | Wholesale & retail | 2021 |
| JAY Plastering and Maintenance Ltd | Construction | 2026 |
| Jaykash Hospitality Midlands Ltd | Hospitality | 2024 |
| Jays Property Investments Limited | Real estate | 2019 |
| JAZ Brow Hair & Beauty Ltd | Other services | 2020 |
| JAZ Transport Ltd | Construction | 2021 |
| Jazib Limited | Wholesale & retail | 2019 |
| Jazzy Digital Limited | Wholesale & retail | 2025 |
| JB Security Services Ltd | Administrative & support | 2017 |
| JBL Builders Ltd | Construction | 2025 |
| JCH Air Conditioning Limited | Construction | 2011 |
| Jclinica Limited | Health & social care | 2026 |
| JCM Contracts (Midlands) Ltd. | Construction | 2002 |
| JCM Contracts Partners LLP | | 2023 |
| JD Management Services (Midlands) Ltd | Real estate | 2018 |
| JD Prime Estates Limited | Hospitality | 2025 |
| JD Woodcraft Ltd | Manufacturing | 2025 |
| Jdrm Trading Limited | Wholesale & retail | 2023 |
| Jensthetics Ltd | Other services | 2026 |