| Kerry Jackson Education Services Limited | Education | 2025 |
| Killen Contractors Ltd | Construction | 2014 |
| Kingswood Contractors SW Ltd | Administrative & support | 2024 |
| KJ Pike Ltd | Real estate | 2016 |
| KMC Business Consulting Limited | Professional & scientific | 2017 |
| KOH Thai Noodle Limited | Hospitality | 2019 |
| Kproduxts Limited | Wholesale & retail | 2025 |
| Krupnikoz Ltd | Manufacturing | 2019 |
| KS Wohnung Ltd | Real estate | 2019 |
| Kubix Consultancy Ltd | Information & communication | 2015 |
| Kubix Outsource Limited | Professional & scientific | 2016 |
| KW Construction & Design Ltd | Households | 2025 |
| Kwrs Roofing Ltd | Construction | 2024 |
| Kyff Ltd | Arts & recreation | 2024 |
| L Freeman Limited | Construction | 2023 |
| L&Bpubholdings Ltd | Hospitality | 2021 |
| L&G Holdings SW Ltd | Financial services | 2022 |
| L. Pearse and Sons Ltd | Construction | 2023 |
| Land Financial Construction Ltd | Construction | 2021 |
| Landulph Festival CIC | Arts & recreation | 2023 |
| Laser Eraser Ltd | Administrative & support | 2024 |
| Launceston BH Ltd | Administrative & support | 2025 |
| Lawn + Order Ltd | Administrative & support | 2016 |
| Lcbh Carpentry Limited | Construction | 2026 |
| LE Corbeau Property Limited | Real estate | 2026 |
| Lead RN Ltd | Education | 2018 |
| Leaf Consulting Ltd | Professional & scientific | 2018 |
| LEH Property Investments Limited | Real estate | 2021 |
| Lhhp Limited | Professional & scientific | 2014 |
| Lifestyle Change Limited | Health & social care | 2018 |
| Lifestyle Richmond Ltd | Administrative & support | 2013 |
| Lindfield Consultancy Ltd | Education | 2019 |
| Liquid Fire International Limited | Extraterritorial | 2016 |
| Listyou Limited | Professional & scientific | 2001 |
| Little Carpet and RUG Centre Limited | Wholesale & retail | 2025 |
| Little Legs Productions Ltd | Information & communication | 2025 |
| Little Rogues Limited | Financial services | 2004 |
| Littleherts Cafe Ltd | Hospitality | 2026 |
| LJR Music Ltd | Information & communication | 2022 |
| LKK Bridge Ltd | Hospitality | 2024 |
| Lloyd Chilcott Ltd | Education | 2024 |
| Lloyds Learning Ltd | Administrative & support | 2007 |
| LM Brickwork (South West) Limited | Construction | 2022 |
| LM Motoring Ltd | Education | 2025 |
| LMJ Autohaus Ltd | Wholesale & retail | 2026 |
| Lock, Stock and Maintenance Limited | Transport & logistics | 2014 |
| Lockyer Lettings Ltd | Real estate | 2024 |
| Logic Accounts Limited | Professional & scientific | 2016 |
| Long Orchard Equestrian Centre Ltd | Agriculture & fishing | 2023 |
| Long Orchard Property Ltd | Real estate | 2023 |
| Longmeadow Properties Limited | Real estate | 1998 |
| Lower Trevollard Enterprises Ltd | Agriculture & fishing | 2020 |
| Lrtc South West Ltd | Education | 2026 |
| Lucky Seven PVT Ltd | Hospitality | 2024 |
| Luxury From Landfill Ltd | Manufacturing | 2021 |
| Lyleandherb Ltd | Real estate | 2020 |
| Lynher Growers Limited | Agriculture & fishing | 2025 |
| M & PJ Ltd | Health & social care | 2017 |
| M Benson & Sons Limited | Construction | 2017 |
| M Drake & SON Limited | Wholesale & retail | 2005 |
| M Happy Chef Limited | Hospitality | 2016 |
| M J Cole Heating and Electrical Limited | Construction | 2018 |
| M. Peck Decorating Contractors Ltd | Construction | 2019 |
| M.I.A. & Co Rentals Ltd | Real estate | 2024 |
| Mabecron Books Limited | Wholesale & retail | 1997 |
| Maben Limited | Construction | 2014 |
| MAD Motors Ltd | Wholesale & retail | 2023 |
| Made by Ralph Ltd | Professional & scientific | 2018 |
| Maku Bakery Ltd | Manufacturing | 2026 |
| Malawian-Uk Nurses Association for Advancement | Other services | 2020 |
| Maloo Technical Services Limited | Manufacturing | 2009 |
| Mambu Consult Ltd | Professional & scientific | 2026 |
| Mandfholdings (SW) Limited | Financial services | 2014 |
| Manor Farm (Trematon) Management Company Limited | Households | 2013 |
| Marchford Limited | Other services | 2022 |
| Marineco Limited | Agriculture & fishing | 2012 |
| Marlborough Construction Limited | Wholesale & retail | 2005 |
| Matchett Consultancy Limited | Administrative & support | 2014 |
| Matons Housing Limited | Real estate | 2021 |
| Mavi Chef Ltd | Hospitality | 2025 |
| Mayflower Exports Holdings Ltd | Financial services | 2022 |
| Mayflower Services Group Ltd | Wholesale & retail | 2023 |
| Mccarthy Asset Holdings Ltd | Financial services | 2026 |
| Mccarthy Estates Ltd | Real estate | 2023 |
| MCH Financial Planning Ltd | Financial services | 2009 |
| Mcslots Ltd | Wholesale & retail | 2015 |
| Mcwild Group Limited | Wholesale & retail | 2018 |
| Mega Slate Limited | Wholesale & retail | 2025 |
| Megan Haigh Ltd | Professional & scientific | 2025 |
| MEL Forsyth Limited | Professional & scientific | 2023 |
| Melody Properties Limited | Real estate | 2015 |
| Merc Service (SW) Ltd | Wholesale & retail | 2019 |
| MGW (Manor) Properties Limited | Real estate | 2017 |
| Micro Mini Plant Hire & Groundworks Limited | Construction | 2017 |
| Millennium Merchant Ltd | Wholesale & retail | 2022 |
| Milvus Lifestyle and Hire Ltd | Wholesale & retail | 2025 |
| MK Callington Store Ltd | Wholesale & retail | 2020 |
| MK Remedial Construction Ltd | Construction | 2024 |
| Mobile PC Doctor Ltd | Other services | 2006 |
| Modol Holdings Limited | Real estate | 2017 |