| Lower Cholwell Farm Limited | Agriculture & fishing | 1964 |
| Lowry Sales Ltd | Wholesale & retail | 2024 |
| LPG Parts Shop Ltd | Wholesale & retail | 2016 |
| Lppl Limited | Arts & recreation | 2011 |
| LR Management Services (SW) Ltd | Financial services | 2023 |
| LR Properties South West Ltd | Real estate | 2022 |
| Lrfakk Properties Ltd | Households | 2021 |
| LRP Chrysalis Ltd | Professional & scientific | 2023 |
| LRP Woodlands Ltd | Financial services | 2022 |
| LS Building and Plastering Ltd | Construction | 2019 |
| LSC Vehicle Repairs Ltd | Wholesale & retail | 2022 |
| LSL Groundworks & Plant Hire Ltd | Construction | 2022 |
| LSP Leadership Ltd | Professional & scientific | 2002 |
| LT Learning Ltd | Education | 2020 |
| LT Logistics Ltd | Transport & logistics | 2023 |
| LTC GROUP87 Ltd | Construction | 1997 |
| LTC Powered Access Ltd | Construction | 2017 |
| LTC Specialist Scaffolding Limited | Construction | 2008 |
| LTC Training Services Ltd | Construction | 2017 |
| LTP Holdings Ltd | Real estate | 2017 |
| LTP Management Limited | Real estate | 2026 |
| LTP Streaming Ltd | Information & communication | 2020 |
| Lucalui Ltd | Wholesale & retail | 2021 |
| Lucielucie Ltd | Extraterritorial | 2024 |
| Lucinda Wright Associates Ltd | Arts & recreation | 2015 |
| Lucky 29 Ltd | Hospitality | 2020 |
| Lucky FOX Limited | Construction | 2012 |
| Lucy Marie Consulting Ltd | Professional & scientific | 2021 |
| Lugar Construction Limited | Construction | 2001 |
| Lugar Management Solutions Limited | Construction | 2024 |
| Lukasz Kopocinski Ltd | Health & social care | 2023 |
| Luluc Motorcycles Ltd | Administrative & support | 2023 |
| Lumberjill Milling Ltd | Manufacturing | 2021 |
| Lumen Offices Limited | Professional & scientific | 2025 |
| Lumos Financial Strategy Ltd | Professional & scientific | 2025 |
| Lunar Fragrances Ltd | Wholesale & retail | 2023 |
| Lunar Press Limited | Information & communication | 2022 |
| Lunar Rise Management Company Limited | Households | 2004 |
| Lunar Rise RTM Company Limited | Households | 2014 |
| Lunette Labs Limited | Information & communication | 2025 |
| Lurra URA Ltd | Agriculture & fishing | 2022 |
| Luscombe & Weight Limited | Wholesale & retail | 2011 |
| Luscombe Business Support Ltd | Administrative & support | 2020 |
| Lustre Property Care Ltd | Administrative & support | 2025 |
| LUV Plymouth Lettings Ltd | Real estate | 2021 |
| LUV Plymouth Limited | Real estate | 2015 |
| Luvly Management Ltd | Professional & scientific | 2025 |
| LUX Barber (SW) Ltd | Other services | 2025 |
| Luxe Commercial Services Southwest Limited | Administrative & support | 2026 |
| Luxe Living by Sophia Limited | Hospitality | 2018 |
| Luxuride Ltd | Transport & logistics | 2024 |
| Luxury Beauty Lounge Ltd | Other services | 2018 |
| Luxus Home Fragrance Ltd | Manufacturing | 2015 |
| Luxx Nails Ltd | Other services | 2022 |
| LV Estates Ltd | Real estate | 2019 |
| Lvbristol Ltd | Wholesale & retail | 2019 |
| LVC Barbers Ltd | Other services | 2025 |
| LVE Productions Ltd | Information & communication | 2023 |
| LW Cleaning & Property Maintenance Ltd | Construction | 2025 |
| LWF Investments Limited | Financial services | 2021 |
| Lwsurveying Ltd | Professional & scientific | 2014 |
| LYC Trading Ltd | Wholesale & retail | 2026 |
| Lydford Event Catering Ltd | Hospitality | 2023 |
| Lynch Holdings SW Ltd | Professional & scientific | 2025 |
| Lynchpin Accommodation Limited | Real estate | 2016 |
| Lynchpin Refurbishment Limited | Construction | 2016 |
| Lyneham Farm LLP | | 2026 |
| Lyntan Limited | Real estate | 2025 |
| Lyratech Engineering Ltd | Construction | 2022 |
| Lyratech Investments Ltd | Financial services | 2025 |
| Lyte Hill Court Limited | Households | 2007 |
| M & B Residential Lettings Limited | Real estate | 2007 |
| M & C Projects Ltd | Wholesale & retail | 2024 |
| M & J Consultancy Services Ltd | Professional & scientific | 2015 |
| M & M Steel Fixings South West Limited | Construction | 2014 |
| M & T Heating and Plumbing Services Limited | Construction | 2007 |
| M B Ireland Engineering Ltd | Manufacturing | 2011 |
| M B Plumbing (South West) Limited | Construction | 2012 |
| M Construction (SW) Ltd | Construction | 2025 |
| M D Properties (South West) Limited | Real estate | 2017 |
| M Dawson Plumbing & Heating Ltd | Construction | 2012 |
| M Developments (SW) Ltd | Real estate | 2018 |
| M G Scaffolding (Plymouth) Limited | Construction | 2014 |
| M Hare Consulting Ltd | Information & communication | 2026 |
| M I Hall Consultancy Ltd | Construction | 2019 |
| M J Ingham Limited | Professional & scientific | 2023 |
| M K Bodyshop (Commercial) Limited | Wholesale & retail | 2017 |
| M K Developements Limited | Construction | 2018 |
| M M Hamilton Limited | Construction | 1998 |
| M Palmer Scaffolding Limited | Construction | 2018 |
| M R Building Contractors Limited | Construction | 2019 |
| M Rich Plymouth Ltd | Wholesale & retail | 2024 |
| M Rodwell Decorating Specialists Ltd | Construction | 2024 |
| M Rowe & SON Limited | Administrative & support | 2021 |
| M Subs Limited | Manufacturing | 2006 |
| M W Access Scaffolding Ltd | Construction | 2016 |
| M West Consultancy Limited | Professional & scientific | 2024 |
| M&B Harrison Ltd | Professional & scientific | 2017 |
| M&J Leisure Limited | Hospitality | 2012 |
| M&J Property Investment Group Limited | Construction | 2025 |