| INV Holdings Limited | Financial services | 2025 |
| Iplumb Iheat Ltd | Construction | 2018 |
| Ipnomamma Ltd | Education | 2023 |
| Isca Property Limited | Real estate | 2020 |
| Island Hoppers Limited | Professional & scientific | 2010 |
| IT Power Group Ltd | Professional & scientific | 2023 |
| J & M House Removals Ltd | Transport & logistics | 2021 |
| J C Mitchell Ltd | Other services | 2006 |
| J Savage Consultancy Ltd | Education | 2024 |
| JA & RA Martin Limited | Construction | 2010 |
| Jackmans Down Limited | Agriculture & fishing | 2026 |
| Jacobs Pool Management Company Limited | Households | 1996 |
| James Insights Limited | Professional & scientific | 2023 |
| James Tennant Limited | Wholesale & retail | 2009 |
| Jamie Ware Building Contractors Limited | Construction | 2024 |
| Janus Advisory Limited | Professional & scientific | 2024 |
| Jardinage Limited | Administrative & support | 2024 |
| JAX Ebikes Limited | Wholesale & retail | 2018 |
| JB Plant and Sweeper Hire Ltd | Construction | 2019 |
| JC Elevators Ltd | Professional & scientific | 2025 |
| Jenny Natalie Knode Ltd | Extraterritorial | 2024 |
| JJC Tax Advice Limited | Professional & scientific | 2025 |
| JJS Carpentry & Steelworks Ltd | Manufacturing | 2026 |
| John Moore Dental Practice Limited | Health & social care | 2011 |
| John Wetton Limited | Arts & recreation | 1975 |
| Joint TEC Services Limited | Construction | 2021 |
| JON Riley Media Limited | Information & communication | 2016 |
| Jordan Family Estate Ltd | Real estate | 2013 |
| JPL Consulting Limited | Professional & scientific | 2016 |
| JRM Farming Limited | Agriculture & fishing | 2001 |
| Jubilee.Tech Ltd | Information & communication | 2017 |
| Julian Brown Consultancy Limited | Professional & scientific | 2011 |
| Kalixa Designs Ltd | Wholesale & retail | 2019 |
| Karen Elson Consulting Limited | Financial services | 2011 |
| KD Financial LLP | | 2019 |
| Kersleigh Court Management Company Limited | Households | 2013 |
| Kestrel QT Limited | Professional & scientific | 2023 |
| Kevin Heaphy Building & Surveying Services Limited | Professional & scientific | 2005 |
| Keyquest Health Ltd | Professional & scientific | 2007 |
| Kilby Enterprises Limited | Administrative & support | 2011 |
| Killer Guitar Ltd | Information & communication | 2006 |
| Kinetix SFX Ltd | Information & communication | 2014 |
| Kingfisher Vehicle Services Limited | Wholesale & retail | 2018 |
| Kingsmere Music Limited | Information & communication | 2016 |
| Kirkpatrick Wallis Investments | Financial services | 1969 |
| KJM Fitness Limited | Arts & recreation | 2022 |
| Koast Limited | Wholesale & retail | 2012 |
| Kompose Audio Limited | Wholesale & retail | 2024 |
| KRW Publishing Limited | Information & communication | 2015 |
| Kyndo Creative Ltd | Professional & scientific | 2025 |
| L Mitchell Medical Limited | Health & social care | 2024 |
| L.A.W.R. Consultancy Limited | Extraterritorial | 2012 |
| Lamerton Group Ltd | Professional & scientific | 2022 |
| LAS Aerospace Ltd. | Administrative & support | 1986 |
| Laughing Dog Boats Ltd | Real estate | 2016 |
| Lawsons Electrical Limited | Construction | 2008 |
| LCP Bidco Limited | Financial services | 2017 |
| LE Metier Limited | Manufacturing | 2018 |
| Leading Edge (UK) Ltd | Administrative & support | 2007 |
| Legal Integrated Solutions Limited | Professional & scientific | 2016 |
| Lighter Learning CIC | Education | 2025 |
| Lighthouse Property Holdings Limited | Construction | 2023 |
| Lincoln Implants Limited | Health & social care | 2007 |
| Little Widefield Agricultural Holdings Limited | Agriculture & fishing | 2015 |
| Living Seeds CIC | Wholesale & retail | 2026 |
| Living Work Consulting Ltd | Professional & scientific | 2024 |
| LJ Birmingham Ltd | Manufacturing | 2020 |
| Lkmac Holdings Limited | Real estate | 2024 |
| Lkmac Ltd | Hospitality | 2011 |
| Lloyd & Co Blacksmiths Ltd | Manufacturing | 2019 |
| Lloyd Barnes Commercial Recruitment Limited | Administrative & support | 2016 |
| LMS Digital Ltd | Information & communication | 2016 |
| Londonmark Films Production Limited | Information & communication | 2008 |
| Longcrest Estates Ltd | Real estate | 1999 |
| Louiseslashes Ltd | Other services | 2025 |
| Lovaton Farm Limited | Agriculture & fishing | 1999 |
| Lowton Property (South West) Limited | Real estate | 2020 |
| Lyfe Okehampton Ltd | Other services | 2022 |
| Lyndridge & Astley Corte Residents Association Limited | Extraterritorial | 1986 |
| Lynmedl Ltd | Professional & scientific | 2016 |
| M - Award Solar Installations Limited | Construction | 2012 |
| M Baker (Holdings) Limited | Professional & scientific | 1977 |
| M Baker (Matford) Limited | Real estate | 2017 |
| M Baker (Newquay) Limited | Real estate | 2010 |
| M Baker (Retail) Limited | Real estate | 2012 |
| M Baker (Roche) Limited | Construction | 2015 |
| M Baker (South West) Limited | Real estate | 1988 |
| M Boyland Properties Ltd | Construction | 2021 |
| M J Safety Management Limited | Professional & scientific | 2020 |
| M&A Nails Spa Ltd | Other services | 2025 |
| M&M Construction Devon Limited | Construction | 2025 |
| M&R Tekla Detailing Limited | Professional & scientific | 2025 |
| M&T Holdings Limited | Financial services | 2022 |
| M&T Homecare Limited | Public administration | 2025 |
| M. Baker (Property Services) Limited | Construction | 1983 |
| Maddaford Care Services Limited | Health & social care | 2017 |
| Madds Investments Limited | Real estate | 2026 |
| Made Well Community Interest Company | Health & social care | 2007 |
| Madelkat Limited | Professional & scientific | 2012 |
| Magnolia Way (Okehampton) Management Company Limited | Real estate | 2021 |