| Highbridge Holdings Ltd | Real estate | 2018 |
| HIS Grace 247 Services Ltd | Wholesale & retail | 2022 |
| Hjsa Ltd | Health & social care | 2022 |
| Holiday Travel Experts Ltd | Administrative & support | 2026 |
| Holt RD Small Holdings Ltd | Other services | 2023 |
| Homecare in and OUT Limited | Construction | 2019 |
| HORIZONE360 Limited | Professional & scientific | 2025 |
| House Party Ltd | Hospitality | 2016 |
| HSL Builders Limited | Construction | 2024 |
| Humpty Dumptys Nursery Limited | Health & social care | 2015 |
| Hundal Transport Ltd | Transport & logistics | 2025 |
| Hussain & Kazmi Limited | Health & social care | 2009 |
| Hydro Hygienic Ltd | Construction | 2023 |
| Hyper Vision Ltd | Real estate | 2012 |
| I Care Properties Ltd | Real estate | 2018 |
| I-Warmheating Ltd | Wholesale & retail | 2025 |
| IAN Woodward Accountancy Limited | Professional & scientific | 2011 |
| IB Demystified PVT Ltd | Education | 2023 |
| Ibbery Property Ltd | Real estate | 2025 |
| Iberia Skin Brands Ltd | Wholesale & retail | 2018 |
| Iceyset Limited | Information & communication | 2015 |
| Identity Salon Ltd | Other services | 2021 |
| IDP Training Limited | Education | 2021 |
| Idream Group Limited | Wholesale & retail | 2018 |
| Ifamz Ltd | Wholesale & retail | 2024 |
| IFS Outsource Ltd | Administrative & support | 2020 |
| IFW Properties Ltd | Other services | 2022 |
| IH Auto Hire Ltd | Other services | 2024 |
| Ihome Concepts Limited | Wholesale & retail | 2024 |
| IM FIX Ltd | Construction | 2018 |
| Impreshens Limited | Information & communication | 2006 |
| Included Careers CIC | Education | 2025 |
| Incy Wincy's Day Nursery Ltd | Health & social care | 2024 |
| International Shop Market Ltd | Wholesale & retail | 2025 |
| International Tyres & Trading Limited | Wholesale & retail | 1990 |
| IP Voice Networks Ltd | Information & communication | 2016 |
| Ipackit Ltd | Wholesale & retail | 2023 |
| IPD Consulting Ltd | Professional & scientific | 2020 |
| Ironvale Industries Limited | Professional & scientific | 2025 |
| Itcom Solutions Ltd | Information & communication | 2013 |
| Ivape Ltd | Administrative & support | 2018 |
| J & S Food Suppliers Limited | Hospitality | 2025 |
| J Birch Holdings Ltd | Other services | 2026 |
| J Birch Technologies Ltd | Other services | 2026 |
| J Coffee Ltd | Hospitality | 2019 |
| J D Hire & Driveways Ltd | Construction | 2023 |
| J R Dubb and Sons Limited | Hospitality | 2024 |
| J.R Building and Maintenance Services Limited | Construction | 2016 |
| J.S Quality Electrical Services Limited | Other services | 2009 |
| J.T. NEX Limited | Manufacturing | 1981 |
| Jade Dragon 201 Limited | Hospitality | 2021 |
| Jagh Corporate Limited | Wholesale & retail | 2016 |
| Jagpol Ltd | Wholesale & retail | 2014 |
| Jalebi N Spice Limited | Wholesale & retail | 2024 |
| JAN Andrews Limited | Hospitality | 2026 |
| Jannat Asset Management Ltd | Real estate | 2025 |
| Janshaven Logistics Limited | Transport & logistics | 2026 |
| Jave Phones Ltd | Wholesale & retail | 2025 |
| Jayblissy Ltd | Information & communication | 2017 |
| Jaypay Ltd | Professional & scientific | 2024 |
| Jayproducts Ltd | Wholesale & retail | 2026 |
| JB Property Lettings Ltd | Real estate | 2024 |
| Jennie LEE Travel Ltd | Administrative & support | 2024 |
| Jeph Auto Ltd | Wholesale & retail | 2021 |
| Jerk N Juice Ltd | Hospitality | 2025 |
| Jerry's Property Maintenance Limited | Administrative & support | 2016 |
| Jet-Stream Haulage Limited | Transport & logistics | 2024 |
| Jincheng Catering Limited | Hospitality | 2021 |
| JMC Kelly Limited | Construction | 2020 |
| JMS Legacy Development Ltd | Real estate | 2017 |
| JMV Mechanical Services Ltd | Professional & scientific | 2025 |
| John Sturman Limited | Wholesale & retail | 1988 |
| Jonathan Stewart Solutions Limited | Manufacturing | 2014 |
| Jordans Midlands Property Limited | Real estate | 2023 |
| JR Housing Services Limited | Health & social care | 2019 |
| Jr-Communications Business Limited | Professional & scientific | 2010 |
| JRH Mortgages & Financial Services Ltd | Financial services | 2023 |
| JS Transport Services Limited | Transport & logistics | 2024 |
| JWS Flooring Limited | Construction | 2018 |
| J’Adore Beauty and Aesthetics Limited | Other services | 2024 |
| K.S Double Glazing Windows Ltd | Construction | 2024 |
| Kaiden Group Limited | Information & communication | 2019 |
| Kairo Cars Limited | Wholesale & retail | 2021 |
| Kaizen Autos Ltd | Wholesale & retail | 2025 |
| Kaizen Cars Limited | Wholesale & retail | 2025 |
| Kaligandaki Gyan-Bigyan Pratisthan, Europe | Education | 2021 |
| Karalis-Green Integrated Solutions Ltd | Wholesale & retail | 2026 |
| Kashif Mahmood Production Ltd | Information & communication | 2025 |
| KAT Electrical Ltd | Construction | 2018 |
| Kazmi & Hussain Ltd | Real estate | 2020 |
| Kelly Healthcare Services Limited | Health & social care | 2026 |
| Kelprilia Support Limited | Extraterritorial | 2021 |
| Kemson Projects Ltd | Professional & scientific | 2018 |
| Kenrox Contracts Ltd | Professional & scientific | 2013 |
| KES Holdings Limited | Professional & scientific | 2009 |
| Kestrel Digital Screens Ltd | Extraterritorial | 2014 |
| Kestrel Electrical Systems Limited | Construction | 1991 |
| Kestrel Fire Safety Ltd | Extraterritorial | 2013 |
| Keytracker Limited | Manufacturing | 1996 |
| KHK Convenience Ltd | Wholesale & retail | 2024 |