| Iyamoon Ltd | Wholesale & retail | 2025 |
| Izigging Ltd | Wholesale & retail | 2025 |
| Izofish Ltd | Wholesale & retail | 2025 |
| Izometrik Ltd | Professional & scientific | 2021 |
| J & T Brothers Limited | Hospitality | 2024 |
| J Alexander Group Ltd | Financial services | 2025 |
| J Bossman Realty & Consult Ltd | Real estate | 2024 |
| J Building Maintenance Ltd | Administrative & support | 2022 |
| J Chosen Properties Ltd | Real estate | 2025 |
| J H Energy Services Limited | Professional & scientific | 2019 |
| J LAU Properties Ltd | Real estate | 2024 |
| J Stelling Property Investments 3082 Limited | Real estate | 2024 |
| J&A Medical Ltd | Administrative & support | 2017 |
| J.A.P Property Company Ltd | Real estate | 2022 |
| J.C.D Healthcare Limited | Health & social care | 2019 |
| J.E Brands Limited | Wholesale & retail | 2023 |
| J.Sation Ltd | Professional & scientific | 2024 |
| J.Thurling Services Limited | Wholesale & retail | 2023 |
| J13R Holdings Limited | Financial services | 2025 |
| J1TRADES Ltd | Extraterritorial | 2026 |
| J5 Supply Ltd | Wholesale & retail | 2025 |
| JA Empire 3003 Ltd | Real estate | 2026 |
| JAB Group Holdings Limited | Financial services | 2026 |
| Jabes Lifestyle and Wellbeing Ltd | Health & social care | 2023 |
| Jabez Grace Cloudtech Solutions Ltd | Wholesale & retail | 2024 |
| Jabir & Co Properties Ltd | Real estate | 2024 |
| Jacinto Creative Ltd | Professional & scientific | 2026 |
| Jack Nolan Draws Ltd | Wholesale & retail | 2026 |
| Jackson Sophie Ltd | Wholesale & retail | 2026 |
| Jacksonway Limited | Wholesale & retail | 2023 |
| Jacspo Ltd | Wholesale & retail | 2021 |
| Jade & Lumin Ltd | Wholesale & retail | 2025 |
| Jai-Ho Staffing Ltd | Administrative & support | 2025 |
| Jaimini JL Ltd | Education | 2023 |
| Jakk-D Limited | Real estate | 2025 |
| Jallohpharmaceuticals Ltd | Professional & scientific | 2025 |
| Jalvora Consulting Limited | Professional & scientific | 2024 |
| JAM Consulting Ltd | Professional & scientific | 2023 |
| Jamaidca Ltd | Arts & recreation | 2025 |
| James Coburn Farriers Ltd | Agriculture & fishing | 2014 |
| James Kinchen Gastroenterology Ltd | Health & social care | 2023 |
| James Wealth Partners Ltd | Extraterritorial | 2025 |
| Jamil Hasan Ltd | Extraterritorial | 2023 |
| Jampaoit Ltd | Information & communication | 2025 |
| Jane Reedings Investment Property Ltd | Real estate | 2021 |
| Jarslanhof IT Consulting Ltd | Information & communication | 2025 |
| Jasmine a Property Ltd | Real estate | 2026 |
| Jasmine Rose Interiors Limited | Wholesale & retail | 2018 |
| Jasper Living Limited | Wholesale & retail | 2025 |
| JAX Store UK Ltd | Wholesale & retail | 2025 |
| Jayprinz Services Limited | Wholesale & retail | 2025 |
| Jayton App Ltd | Information & communication | 2026 |
| Jayzenai Ltd | Information & communication | 2025 |
| Jazzles Limited | Real estate | 2024 |
| JB & PB Group Holdings Limited | Financial services | 2026 |
| JB Cybersecurity UK Ltd | Information & communication | 2022 |
| JB Digital Media Ltd | Wholesale & retail | 2026 |
| JB Social Work Services Ltd | Health & social care | 2024 |
| JBGP2M Property Ltd | Real estate | 2016 |
| Jbisw Ltd | Health & social care | 2023 |
| Jccole Ltd | Professional & scientific | 2024 |
| JD Digital Ventures Ltd | Wholesale & retail | 2026 |
| Jdhpm Ltd | Construction | 2023 |
| JDL Auto Group Ltd | Wholesale & retail | 2025 |
| Jdog Media Holding Ltd | Financial services | 2023 |
| JE Property Ltd | Real estate | 2025 |
| Jealies Ltd | Wholesale & retail | 2024 |
| Jeem Ltd | Wholesale & retail | 2024 |
| Jeevs Kitchen Ltd | Hospitality | 2020 |
| Jejo Innovation Ltd | Information & communication | 2013 |
| Jellynova Limited | Wholesale & retail | 2024 |
| Jenla Ltd | Health & social care | 2019 |
| Jensoft Limited | Information & communication | 1988 |
| Jer-Kin’ Ltd | Hospitality | 2024 |
| Jeremie Ltd | Financial services | 2024 |
| Jeremie.Vip Ltd | Information & communication | 2024 |
| Jeremy Bickerstaffe Limited | Information & communication | 2021 |
| Jeremy Clarke Ltd | Information & communication | 2025 |
| Jeromson Engineering Services Ltd | Construction | 2019 |
| Jerusalem Gate Limited | Wholesale & retail | 2024 |
| Jese Solutions Ltd | Wholesale & retail | 2024 |
| Jessel Nightingale Properties Limited | Real estate | 2025 |
| Jessiara Marriott Ltd | Information & communication | 2025 |
| Jessica Kaliisa Ltd | Arts & recreation | 2026 |
| Jest Media Ltd | Manufacturing | 2025 |
| Jetcapture Ltd | Professional & scientific | 2026 |
| Jetsetxplore Ltd | Wholesale & retail | 2023 |
| JF Legal Services Limited | Professional & scientific | 2014 |
| JFK Contracts Ltd | Administrative & support | 2021 |
| Jfmpartners International Group (Jing) Ltd | Financial services | 2025 |
| JFS Plumbing Ltd | Construction | 2022 |
| JHE Plumbing Services Ltd | Construction | 2025 |
| Jhen Properties Ltd | Real estate | 2025 |
| Jhwc Limited | Information & communication | 2017 |
| Jiahe Lijin Ltd | Professional & scientific | 2025 |
| Jireh International Trade Corp Ltd | Wholesale & retail | 2025 |
| Jitusa Ltd | Information & communication | 2024 |
| Jiuyi Education Ltd | Education | 2025 |
| JJ Agency Limited | Real estate | 2023 |
| JJ General Building Ltd | Construction | 2022 |