| Lakeland Retreats Limited | Administrative & support | 2016 |
| Lamare Services Ltd | Water & waste | 2018 |
| Land Marks (Devon) Limited | Professional & scientific | 2006 |
| Landvic Limited | Construction | 2022 |
| Lane Barton Leisure Ltd | Hospitality | 2016 |
| Lateral Industries Limited | Manufacturing | 2025 |
| Lavender Alfa Ltd | Hospitality | 2019 |
| Lazuli Consulting Limited | Professional & scientific | 2017 |
| LC Farms Ltd | Agriculture & fishing | 2024 |
| LEA Terrace Garden Management Ltd | Households | 2016 |
| Lead First Limited | Professional & scientific | 2018 |
| Lead First Property Holdings Limited | Households | 2023 |
| Learning With Dyslexia Ltd | Education | 2022 |
| Lechjoke Ltd | Arts & recreation | 2020 |
| Leggett Building Services Limited | Real estate | 2013 |
| Leggett Properties Limited | Real estate | 2016 |
| Leonard & Co Accountants Ltd | Professional & scientific | 2015 |
| LEWIS3COMMUNITY CIC | Education | 2025 |
| Lexaprint Limited | Transport & logistics | 1990 |
| Liam John Marshall Ltd | Extraterritorial | 2017 |
| Libris Personal Taxation Ltd | Professional & scientific | 2015 |
| Life's Little Recipes Ltd | Manufacturing | 2018 |
| Lightfirm Limited | Wholesale & retail | 1994 |
| Linton Support Ltd | Health & social care | 2017 |
| Little Devon Threads Ltd | Wholesale & retail | 2026 |
| Little Pebbles Financial Solutions Ltd | Administrative & support | 2012 |
| Little Sprog Industries Ltd | Wholesale & retail | 2019 |
| Little White Town Limited | Real estate | 2014 |
| Littles Properties Ltd | Wholesale & retail | 2025 |
| Liver and White Solutions Ltd | Information & communication | 2025 |
| Livit Adventures Ltd | Hospitality | 2017 |
| Lodestone Marketing Ltd | Professional & scientific | 2011 |
| Logistart Limited | Information & communication | 2012 |
| Logistics Professional Ltd | Administrative & support | 2023 |
| Logo Leisurewear (South West) Limited | Manufacturing | 2010 |
| Logopolis Films Ltd | Information & communication | 2010 |
| Looksmart Spraying Services Ltd | Construction | 2025 |
| Lower Alma & Lakeside Limited | Real estate | 2022 |
| Lower Ossington Holidays Limited | Hospitality | 2014 |
| LTH Interactive Ltd | Information & communication | 2025 |
| Ltsr Limited | Hospitality | 2017 |
| Lubo Developments Ltd | Construction | 2022 |
| Lubo Property Ltd | Real estate | 2019 |
| Lucas Training Ltd | Education | 2023 |
| Luna Power Ltd | Energy | 2023 |
| Lundy Sea View Limited | Hospitality | 2019 |
| Lush Partners Limited | Hospitality | 2020 |
| Lydia and Florian Limited | Hospitality | 2019 |
| LYN Valley Garage Ltd | Wholesale & retail | 2022 |
| Lynd J&A Ltd | Extraterritorial | 2021 |
| M & D Electrical SW LLP | | 2021 |
| M & J Lang Developments Ltd | Construction | 2014 |
| M C a Quality Services Limited | Professional & scientific | 2009 |
| M D Littlejohn Ltd | Construction | 2014 |
| M&E Farm Limited | Agriculture & fishing | 2023 |
| M-Tec Heat Pumps UK Ltd | Wholesale & retail | 2023 |
| M2Z Ltd | Information & communication | 2001 |
| Maccapital Finance Limited | Financial services | 1976 |
| Machine Shop Ltd | Wholesale & retail | 2023 |
| Maco Contractors Limited | Administrative & support | 2019 |
| Made in PLY Ltd | Wholesale & retail | 2012 |
| Maestrat Cycling Limited | Administrative & support | 2026 |
| Magic Gathered Ltd | Wholesale & retail | 2024 |
| Maisie's Smallholding Ltd | Hospitality | 2025 |
| Majic Property (Two) Limited | Construction | 2011 |
| Mamatuga Limited | Education | 2023 |
| Mambury Farm Limited | Agriculture & fishing | 2006 |
| Mambury Furniture Ltd | Manufacturing | 2022 |
| MAN in Trouble Ltd | Arts & recreation | 2022 |
| MAN With a Hammer Ltd | Other services | 2021 |
| Manaprime Ltd. | Construction | 2017 |
| Mandaruva Ltd | Real estate | 2024 |
| Manus Energy Limited | Energy | 2023 |
| Maple and Moor Media Group Ltd | Professional & scientific | 2024 |
| Marcle Ltd | Health & social care | 2021 |
| Marcus Baxter Limited | Extraterritorial | 2025 |
| Maritime Design Services Limited | Professional & scientific | 1976 |
| Mark Bedler Limited | Construction | 2010 |
| Mark Lace Ltd | Construction | 2021 |
| Mark Watts & Sons Limited | Construction | 2017 |
| Market Hotels Limited | Hospitality | 2015 |
| Marley Communications Limited | Information & communication | 2012 |
| Marshall Building Services LLP | | 2019 |
| Matvey Limited | Hospitality | 2015 |
| MAW Carpentry & Joinery Limited | Construction | 2016 |
| Mayking Theatre Ltd | Arts & recreation | 2025 |
| Maynard Collective Limited | Professional & scientific | 2020 |
| Maynard Johns Limited | Professional & scientific | 2006 |
| Mayo Media 2015 Ltd | Information & communication | 2015 |
| Mays Meadow Management Company Ltd | Real estate | 2023 |
| MCL Property and Construction Limited | Construction | 2021 |
| Meadowville Court Management Limited | Households | 2002 |
| Medical Artists' Association of Great Britain | Other services | 1990 |
| Medicare Southwest Limited | Health & social care | 2014 |
| Megaflex Limited | Manufacturing | 1996 |
| Meraki Heritage Limited | Wholesale & retail | 2021 |
| Merton Village Services Ltd | Wholesale & retail | 2015 |
| MH Building and Conservatory Solutions Ltd | Construction | 2025 |
| MH Creative Media Limited | Arts & recreation | 2024 |
| Mhsh Consultancy Limited | Professional & scientific | 2024 |