| Joneshouse Recruitment Ltd | Administrative & support | 2024 |
| Jordan RDC Limited | Professional & scientific | 2026 |
| Jordan the Traveling Chef Limited | Hospitality | 2026 |
| Jordan Tree Surgery Limited | Agriculture & fishing | 2013 |
| Joryeff Electrical Ltd | Manufacturing | 2017 |
| Joseph Gearing Plumbing and Heating Ltd | Construction | 2023 |
| Joseph House Residents Ltd | Households | 2007 |
| Joseph Mitchell Ltd | Health & social care | 2023 |
| Joseph Studio Ltd | Hospitality | 2025 |
| Jotim Limited | Professional & scientific | 2020 |
| JP & MP Construction Limited | Construction | 2016 |
| JP Developments Group Limited | Construction | 2016 |
| JP Estimating Limited | Construction | 2024 |
| JP Management Holdings Ltd | Financial services | 2023 |
| JPA Lettings Ltd | Real estate | 2020 |
| JPA Properties Ltd | Other services | 2012 |
| JPM Prestige Paintworks Ltd | Construction | 2020 |
| JPM Welding & Fabrication Ltd | Construction | 2025 |
| Jr-Wh Ltd | Other services | 2025 |
| JRH Site Services Limited | Professional & scientific | 2015 |
| JRM Cable Services Ltd | Construction | 2024 |
| JSA Security Services Ltd | Administrative & support | 2023 |
| JSF Autos Ltd | Wholesale & retail | 2026 |
| JSK Fitness Ltd | Arts & recreation | 2024 |
| JSN Consultancy Ltd | Professional & scientific | 2025 |
| JSW Life Advisory Ltd | Financial services | 2025 |
| JT Carpentry and Building Limited | Construction | 2015 |
| JTF Consultancy Services Limited | Administrative & support | 2007 |
| Juand Holdings Limited | Professional & scientific | 2021 |
| Jubilee Motor Company Ltd | Wholesale & retail | 2023 |
| Jubilee Nurseries Limited | Administrative & support | 2021 |
| Jude Photo Agency Limited | Professional & scientific | 2021 |
| Judi's Wellbeing Southern CIC | Health & social care | 2017 |
| Juice Communications Group Limited | Financial services | 2011 |
| Juice Festivals Ltd | Arts & recreation | 2014 |
| Jules Jones Ltd | Professional & scientific | 2022 |
| Julmax Ltd | Transport & logistics | 2015 |
| Jump for Gold Ltd. | Arts & recreation | 2007 |
| Jungle Cover Limited | Extraterritorial | 2024 |
| Junny's Automobiles Limited | Wholesale & retail | 2026 |
| Jupiter Controls Limited | Information & communication | 2022 |
| Jury Investments Ltd | Real estate | 2021 |
| Just Brix Limited | Real estate | 2010 |
| Just Build IT Development Ltd | Construction | 2025 |
| Just Connected Limited | Wholesale & retail | 2019 |
| Just Enough Ingredients Ltd | Manufacturing | 2017 |
| Just Fishing Boats Limited | Wholesale & retail | 2016 |
| Just for Luck Limited | Real estate | 2018 |
| Just Gents Barbers Fareham Ltd | Other services | 2025 |
| Just Neat Cleaning Limited | Administrative & support | 2025 |
| Just Records Events Limited | Administrative & support | 2024 |
| Just Tradies Limited | Other services | 2026 |
| Just WOK Limited | Hospitality | 2021 |
| Justchrono Ltd | Wholesale & retail | 2026 |
| Justin Dickens Medical Services Limited | Health & social care | 2017 |
| Juunipa Ltd | Education | 2018 |
| JW Photography Limited | Professional & scientific | 2010 |
| JW Waste Ltd | Water & waste | 2026 |
| JWA Build-Consult. Limited | Professional & scientific | 2023 |
| JWR Audit Limited | Professional & scientific | 2019 |
| JWR Probate Ltd | Administrative & support | 2023 |
| JWR Wealth Associates Ltd | Professional & scientific | 2024 |
| K & S Roofing Ltd | Construction | 2024 |
| K a P Freight Limited | Transport & logistics | 2018 |
| K B S Design Limited | Professional & scientific | 1999 |
| K G Installations Limited | Construction | 2003 |
| K I Bateson & Sons Roofing Limited | Construction | 2022 |
| K M Entertainment Limited | Wholesale & retail | 2020 |
| K M General Building Maintenance Ltd | Construction | 2023 |
| K Martin Groundworks Ltd. | Construction | 2017 |
| K P B Services Ltd | Administrative & support | 2024 |
| K P L Executive Travel Limited | Transport & logistics | 2019 |
| K S Contracting Services Limited | Professional & scientific | 2013 |
| K TEK (UK) Limited | Construction | 1987 |
| K Turvey General Builders Limited | Construction | 2007 |
| K W B Brickwork Limited | Construction | 2019 |
| K&H Assets Limited | Real estate | 2020 |
| K&H Catering Limited | Hospitality | 2022 |
| K&H Homes Limited | Real estate | 2019 |
| K&H JAB Limited | Real estate | 2024 |
| K. Bartlett Developments Ltd | Construction | 2014 |
| K.A Carpentry & Home Improvements Ltd | Construction | 2025 |
| K2 Contracts Ltd | Professional & scientific | 2020 |
| K6GAS Ltd | Construction | 2025 |
| K8W Limited | Other services | 2017 |
| Kacimac Limited | Manufacturing | 2003 |
| Kais Composites Limited | Manufacturing | 2024 |
| Kaizen Properties Ventures Ltd | Hospitality | 2025 |
| KAM Electrical Solutions Limited | Construction | 2022 |
| Kamada Services Limited | Health & social care | 2018 |
| Kamper Hire UK Ltd | Administrative & support | 2003 |
| Kamper Holdings Limited | Administrative & support | 2015 |
| Kanor Commercial Services Limited | Professional & scientific | 2024 |
| Kanto Kollectables Ltd | Wholesale & retail | 2025 |
| Kappa Limited | Real estate | 2022 |
| Karibu Education Limited | Education | 2023 |
| Kasakosa Ltd | Wholesale & retail | 2014 |
| Kasey Heron Ltd | Health & social care | 2025 |
| Katalina Hospitality Limited | Hospitality | 2025 |
| Kate Afshar Limited | Extraterritorial | 2022 |