| Jacovent Limited | Manufacturing | 2026 |
| Jaga Investments Limited | Administrative & support | 2022 |
| Jakson Construction Limited | Construction | 2018 |
| Jakson Properties Limited | Real estate | 2018 |
| Jamaica Coffee Distributors Ltd | Manufacturing | 2022 |
| James Brunton Ltd | Information & communication | 2018 |
| Janbor Forestry Limited | Agriculture & fishing | 2019 |
| Janbor Limited | Manufacturing | 2000 |
| Janbor Recycling Limited | Water & waste | 2005 |
| JAX Consultancy Ltd | Construction | 2026 |
| Jayanta Properties Limited | Real estate | 2022 |
| JCJ Consulting Services Limited | Financial services | 2017 |
| JCJ Website Management Company Limited | Information & communication | 2022 |
| JCL Flooring Solutions Limited | Construction | 2013 |
| JDA Code Limited | Information & communication | 2024 |
| Jerome Scaffolding Ltd | Construction | 2020 |
| Jerrys Property Management Ltd | Real estate | 2025 |
| Jetsetter Ltd | Information & communication | 2019 |
| Jevywood Ltd | Information & communication | 2013 |
| JG Media Limited | Information & communication | 2017 |
| JM3 Services Ltd | Construction | 2023 |
| JNC Consultancy Ltd | Health & social care | 2020 |
| JNN Property Ltd | Real estate | 2022 |
| Johnson Packaging Logistics Ltd | Wholesale & retail | 2024 |
| Jollof Hub UK Ltd | Hospitality | 2026 |
| Jones & Carr Ltd | Information & communication | 2004 |
| JOS Trading Ltd | Wholesale & retail | 2024 |
| Joseph's Electricians Ltd | Construction | 2012 |
| Journeyfy Ltd | Transport & logistics | 2024 |
| Jpgh & Associates Ltd | Other services | 2015 |
| JR Payroll & Accounting Services Limited | Professional & scientific | 2016 |
| JUS' Jerk Ltd | Hospitality | 2016 |
| JW Contracts Herts Ltd | Construction | 2025 |
| K L Clothing and Fashion Limited | Wholesale & retail | 2022 |
| K T Nathan Ltd | Other services | 2021 |
| K.C.Gray Limited | Agriculture & fishing | 1965 |
| K.G. Drain Services Limited | Water & waste | 1993 |
| K.O.U Limited | Construction | 2017 |
| Kabaka Homes Ltd | Real estate | 2022 |
| Kalvin Tyres Garage Service Ltd | Wholesale & retail | 2023 |
| Kamo Design Ltd | Professional & scientific | 2022 |
| Karaaslan Transport Limited | Administrative & support | 2020 |
| KAS Web Design and Graphic Ltd | Professional & scientific | 2021 |
| Kavishan Ltd | Wholesale & retail | 2022 |
| Kaya Delivery Ltd | Transport & logistics | 2020 |
| Kaya Transport Solutions Limited | Transport & logistics | 2025 |
| Kbasol Ltd | Wholesale & retail | 2020 |
| KC Home 1 Limited | Construction | 2020 |
| KC Home Investments Limited | Real estate | 2020 |
| KC Homes Group Ltd | Financial services | 2020 |
| KCK Empower Ltd | Education | 2025 |
| Kdconcierge Ltd | Arts & recreation | 2025 |
| Keep IT Clean LDN Limited | Administrative & support | 2018 |
| Kelly Grace Limited | Other services | 2002 |
| Kenneth Faulkner Coach Works Limited | Wholesale & retail | 2012 |
| Kenneth Webb Residentials Ltd | Real estate | 2020 |
| Kesaura Global PVT Ltd | Wholesale & retail | 2025 |
| Kettle Green Sewage Plant Limited | Households | 2016 |
| Kevkade Associates Limited | Other services | 2019 |
| Keys and Homes Ltd | Real estate | 2023 |
| KGK UK Properties Ltd | Real estate | 2023 |
| Kickoff Rugby Recruitment Ltd | Arts & recreation | 2024 |
| Kincentric Leadership CIC | Education | 2025 |
| Kinetiq Labs Ltd | Information & communication | 2025 |
| KLG Projects Ltd | Real estate | 2022 |
| KT Jordan Limited | Transport & logistics | 2018 |
| L&I Bowen Limited | Construction | 2016 |
| LAC Labyrinth Limited | Agriculture & fishing | 2012 |
| Lake-Farnham Developments Ltd | Real estate | 2024 |
| Lakmali Enterprises Ltd | Other services | 2024 |
| LAM Clothing Ltd | Manufacturing | 2019 |
| Lamex Agrifoods Holdings Limited | Wholesale & retail | 2015 |
| Lamex Food Group Limited | Wholesale & retail | 2005 |
| Lancourt Management Limited | Real estate | 1978 |
| Larry LTS Limited | Professional & scientific | 2014 |
| Lash and Glow Training Academy Ltd. | Other services | 2025 |
| Laybourn LLC Ltd | Information & communication | 2023 |
| Laylex Scaffolding Ltd | Transport & logistics | 2021 |
| LBR Consulting Ltd | Professional & scientific | 2012 |
| Lcll Investments Limited | Real estate | 2023 |
| LEE Valley Dog Training School Ltd | Other services | 2026 |
| Legacy & Land Co Limited | Real estate | 2025 |
| Lemon Bros Ltd | Arts & recreation | 2022 |
| LES Beaux Lacs Limited | Agriculture & fishing | 2002 |
| Letsport Limited | Households | 1980 |
| LEX Cleaning & Property Services Ltd | Administrative & support | 2021 |
| LF Sports Limited | Wholesale & retail | 2019 |
| LGK Futures Limited | Information & communication | 2025 |
| LH Cars Limited | Wholesale & retail | 2011 |
| Lincoln Brown & Co Ltd | Professional & scientific | 2021 |
| Lincoln Brown Advisors Ltd | Professional & scientific | 2017 |
| Lincoln Brown Probate Services Ltd | Administrative & support | 2021 |
| Lincoln Brown Wills Ltd | Administrative & support | 2023 |
| Link Data Works Limited | Information & communication | 2025 |
| Lisa H Photography Ltd | Professional & scientific | 2025 |
| Lisu Construction Ltd | Construction | 2025 |
| Live-In Ease Ltd | Real estate | 2018 |
| Living IT Properties Ltd | Real estate | 2021 |
| LM Consulting Services Ltd | Professional & scientific | 2024 |
| LMG Homes Limited | Real estate | 2017 |