| JHC Security Ltd | Administrative & support | 2017 |
| JJ Motors (Midlands) Limited | Wholesale & retail | 2018 |
| JJ Signs & Designs Limited | Manufacturing | 2025 |
| Jlab Ltd | Manufacturing | 2025 |
| JMD90 Housing Ltd | Real estate | 2020 |
| JMF Farming Limited | Real estate | 2019 |
| JMF Holdings Limited | Real estate | 2016 |
| Jmra Consultancy Limited | Professional & scientific | 2018 |
| JNM Locksmith Ltd | Construction | 2025 |
| Joaard Limited | Professional & scientific | 2016 |
| John Day Contracting & Refurbishment Limited | Construction | 2018 |
| John Day Holdings Limited | Financial services | 2018 |
| Joshua Jacob Limited | Financial services | 2014 |
| Joshua Jacob Marketing Limited | Professional & scientific | 2009 |
| Joyfax Investments Limited | Real estate | 2003 |
| Joyfax Properties Limited | Real estate | 1990 |
| JRS Associates Ltd | Administrative & support | 2019 |
| JST PVT Ltd | Wholesale & retail | 2022 |
| JT Erase and Glow Ltd | Other services | 2026 |
| Juniper Car Sales Limited | Wholesale & retail | 2021 |
| JWD Building & Developments Ltd | Construction | 2018 |
| JWD Building Limited | Administrative & support | 2017 |
| K H Heating & Plumbing Limited | Construction | 2026 |
| KDE Engineering Limited | Professional & scientific | 2017 |
| Kelf Car Body Repairs Ltd | Wholesale & retail | 2025 |
| Kelford Investments Ltd | Real estate | 2021 |
| Kelly Herrick Art Ltd. | Health & social care | 2018 |
| Kepple Gate Properties Limited | Real estate | 2024 |
| Key Door Solutions Limited | Administrative & support | 2019 |
| Keystone Investment Group Ltd | Real estate | 2025 |
| Kidz Kaboom Play Centre and Nursery Limited | Education | 2021 |
| Kiln Design Limited | Information & communication | 2014 |
| Kinder Properties Ltd | Real estate | 2024 |
| Kinder Window Cleaning Ltd | Administrative & support | 2025 |
| KOL Construction Ltd | Construction | 2019 |
| Kozan Maintenance and Repairs Ltd | Construction | 2020 |
| Krystalleisure Ltd | Hospitality | 2019 |
| Ktmps Maintenance Ltd | Manufacturing | 2022 |
| Kudos Leadership Solutions Limited | Professional & scientific | 2025 |
| KURTTAS6886 Ltd | Hospitality | 2026 |
| L & H Flooring Limited | Construction | 2003 |
| L J Clayton Ltd | Real estate | 2023 |
| L S Freelance Design Limited | Professional & scientific | 2017 |
| L&H Logistics Limited | Transport & logistics | 2026 |
| L2L Waste Management Ltd | Water & waste | 2022 |
| LA Gardenia Investments Limited | Real estate | 1992 |
| LA Maison D'Arielle Ltd | Arts & recreation | 2023 |
| Lagron Limited | Real estate | 1960 |
| Laira Eastern Properties Limited | Real estate | 1994 |
| Laira Properties Limited | Real estate | 1959 |
| Langdon Farm and Hideaway Limited | Hospitality | 2025 |
| Langford Properties (Loscoe) Limited | Real estate | 2005 |
| Laughing Duck Cafe Limited | Hospitality | 2018 |
| Laura Woodward Estate Agents Ltd | Real estate | 2019 |
| Lazy Days Gardening Services Ltd | Administrative & support | 2021 |
| Leander Products Limited | Manufacturing | 2013 |
| LEE Contract Lifting Limited | Construction | 2025 |
| Leeva Plumbing and Heating Limited | Construction | 2006 |
| Legacy Builders & Investments Ltd | Real estate | 2019 |
| Legacy Relocations Ltd | Real estate | 2019 |
| Leothiane Insight Ltd | Information & communication | 2024 |
| Leslie Capital Ltd | Financial services | 2026 |
| Lets Rent Homes Ltd | Real estate | 2019 |
| Lettbuild Homes Limited | Construction | 2012 |
| LFR Commercial Ltd | Administrative & support | 2025 |
| Liam Bullock Housing Limited | Real estate | 2020 |
| Lifestyle Pro Distribution Ltd | Wholesale & retail | 2018 |
| Lilifred Estates Limited | Real estate | 1948 |
| Lily Nails Ripley Ltd | Other services | 2026 |
| Limes Logic Limited | Information & communication | 1986 |
| Linden Signs Ltd | Administrative & support | 2003 |
| Linhay Farm Barns Limited | Real estate | 2021 |
| Lintec Design Limited | Professional & scientific | 2000 |
| Linx Logistics Limited | Transport & logistics | 2010 |
| Lisa B PT Lifting Club Ltd | Arts & recreation | 2025 |
| Lisa Liston Ltd | Health & social care | 2025 |
| Lizzie Taylor Garden Design Limited | Administrative & support | 2009 |
| LKA Installations Ltd | Construction | 2026 |
| LLK Electrical Contractors Ltd | Construction | 2017 |
| Lloyd Structural Limited | Professional & scientific | 2026 |
| Lofley Limited | Wholesale & retail | 2024 |
| Lolapalooza Ltd | Wholesale & retail | 2018 |
| Lorch Limited | Public administration | 2019 |
| Louise Baldwin Hairdressing Ltd | Other services | 2025 |
| LPW Electrical Limited | Construction | 2008 |
| LQC Consultancy Ltd | Professional & scientific | 2026 |
| LSC Flooring Ltd | Construction | 2013 |
| LTS Collaborations Ltd | Professional & scientific | 2022 |
| Lumb Farm 16 Limited | Hospitality | 2016 |
| Luna Nails Lounge Ltd | Other services | 2026 |
| Lunula Moon Ltd | Other services | 2018 |
| Luxury CUT Ltd | Other services | 2025 |
| Lynne Kelly Curtains Ltd | Manufacturing | 2019 |
| Lynne Kelly Interiors Ltd | Wholesale & retail | 2021 |
| Lynx Motor Co Limited | Wholesale & retail | 2008 |
| M & B Heer Properties Ltd | Real estate | 2025 |
| M & C Feiner Ltd | Hospitality | 2019 |
| M I Wigley Ltd | Construction | 2017 |
| M S Smith Ltd | Professional & scientific | 2023 |
| M&L Walles Ltd | Health & social care | 2013 |