| Kosmozia Limited | Financial services | 2023 |
| Kosmozia UK Limited | Information & communication | 2023 |
| Kraken Marine Services Ltd | Transport & logistics | 2023 |
| KSH Plumbing & GAS Services Ltd | Construction | 2026 |
| Kushanku Ltd | Information & communication | 2023 |
| KWB Solutions Ltd | Construction | 2018 |
| L&C Teignmouth Limited | Hospitality | 2024 |
| L. Thirteen Limited | Other services | 2021 |
| LA Construction SW Limited | Construction | 2022 |
| Lake Air Solar Ltd | Extraterritorial | 2025 |
| Lancetek Ltd | Information & communication | 2008 |
| Lansdowne Court (Torquay) Limited | Real estate | 2008 |
| Laura Mchugh Ltd | Professional & scientific | 2024 |
| Laura Wall Art Limited | Wholesale & retail | 2021 |
| Lawrence Advisory Limited | Professional & scientific | 2023 |
| Lazy Jacks Clothing Company Ltd. | Wholesale & retail | 2025 |
| Lbex Ltd | Real estate | 2017 |
| LCS Transport Limited | Transport & logistics | 2004 |
| Leafield Teignmouth Limited | Households | 2002 |
| Lecca Ltd | Administrative & support | 2020 |
| Leighbank Limited | Households | 1989 |
| Leru Solutions Ltd | Information & communication | 2025 |
| Levitate Holdings Limited | Construction | 2021 |
| Lewis & Rowden Limited | Financial services | 2024 |
| Ley's Construction Ltd | Construction | 2021 |
| Ley's Specialist Services Limited | Administrative & support | 2003 |
| Leyden Holdings Limited | Financial services | 2024 |
| Leyden Ltd | Construction | 2020 |
| Liddle Homes Limited | Construction | 2021 |
| Life Settlement Assets PLC | Financial services | 2017 |
| Lighthouse South Devon CIC | Health & social care | 2016 |
| Lindridge Park Management Company Limited | Administrative & support | 1994 |
| Links Care Services Ltd | Health & social care | 2025 |
| Lirio Garden Design Ltd | Administrative & support | 2026 |
| Livemoor Trading Ltd | Wholesale & retail | 2024 |
| Livingstone Lettings Limited | Hospitality | 2018 |
| LJD Ltd | Professional & scientific | 2023 |
| LKT Traffic Management Limited | Construction | 2017 |
| Locker Stash Rugby CIC | Wholesale & retail | 2020 |
| Lone Dolphins Ltd | Professional & scientific | 2025 |
| Look 2D Limited | Professional & scientific | 2023 |
| Looksbyredia Ltd | Other services | 2025 |
| Lottie Locks Limited | Wholesale & retail | 2025 |
| Louise Plant Ltd | Arts & recreation | 2014 |
| LOW and Jones Hairdressing Limited | Other services | 2020 |
| LPB Utilities Limited | Construction | 2014 |
| Lucas Yachting Limited | Manufacturing | 2003 |
| Lunds Electrical Limited | Other services | 2011 |
| M & B Property Maintenance Limited | Wholesale & retail | 1991 |
| M Andrews Studio Ltd | Professional & scientific | 2019 |
| M P Warren Limited | Financial services | 2002 |
| M.R.P. Bricklaying Contractors Limited | Construction | 2002 |
| Macaulay Capital PLC | Financial services | 2022 |
| Macaulay Management Limited | Financial services | 2021 |
| Maccoys Limited | Wholesale & retail | 2007 |
| Magda WOS Limited | Health & social care | 2012 |
| Majestic Direct Limited | Transport & logistics | 1995 |
| Majestic Holidays Limited | Administrative & support | 2021 |
| Majestic Limited | Professional & scientific | 2001 |
| Majestic Prizes Limited | Arts & recreation | 2026 |
| Majestic Tours Limited | Administrative & support | 1987 |
| Majestic World Travel Limited | Administrative & support | 1995 |
| Manimal Limited | Extraterritorial | 2006 |
| Manning Architects Limited | Professional & scientific | 2016 |
| Manor Green Technologies Limited | Information & communication | 2017 |
| Mapleton Audio Limited | Information & communication | 2008 |
| Marina Court Management (Teignmouth) Limited | Households | 2003 |
| Mariners (Newton Abbot) Limited | Hospitality | 2021 |
| Mariners Bay Ltd | Hospitality | 2018 |
| Mark Barrett Electrical Limited | Construction | 2014 |
| Mark Dunn Property Group Ltd | Real estate | 2018 |
| Mark Wall Communications Ltd. | Professional & scientific | 2011 |
| Market Street Accountancy and Taxation Limited | Professional & scientific | 2015 |
| Marlborough House Management Company Limited | Real estate | 2004 |
| Marnico Ltd | Information & communication | 2017 |
| Martin Hill Financial Associates Ltd | Financial services | 2019 |
| Matera Media Ltd | Information & communication | 2026 |
| Maven CJV Ltd | Professional & scientific | 2024 |
| Maze Home Services Ltd | Administrative & support | 2018 |
| Megan Court Management Ltd | Administrative & support | 2011 |
| Melianthus Associates Limited | Administrative & support | 2008 |
| Melville Hospitality Limited | Hospitality | 2015 |
| Meriden Management Company Limited | Households | 1989 |
| MGN Marine Ltd | Professional & scientific | 2013 |
| Miaga Limited | Information & communication | 2017 |
| Michael Marshall Limited | Other services | 2017 |
| Midvale Villas Property Management Ltd | Households | 2025 |
| Millbuild Ltd | Construction | 2016 |
| Millori Ltd | Construction | 2004 |
| Mind and Performance Ltd | Education | 2022 |
| Ministry of Marquees Ltd | Transport & logistics | 2024 |
| MK1 Pro Services LLP | | 2011 |
| Moir Hospitality Ltd | Hospitality | 2018 |
| Molins Catering Limited | Hospitality | 2023 |
| Molten Ventures VCT PLC | Financial services | 1997 |
| Morgan Villas Management Company Limited | Hospitality | 2005 |
| Morganicblends Limited | Wholesale & retail | 2015 |
| Morris GAS Limited | Manufacturing | 2012 |
| Motherkind Ltd | Manufacturing | 2025 |
| Move Car Hire Ltd | Administrative & support | 2024 |