| KNC Property Limited | Real estate | 2024 |
| Knighton Ventures Limited | Manufacturing | 2026 |
| Knot Brothers Ltd | Other services | 2024 |
| Kobina Properties Limited | Professional & scientific | 2003 |
| Koka Holdings Ltd | Financial services | 2019 |
| Kowtow Clothing Limited | | 2019 |
| Kudu Overland Limited | Administrative & support | 2017 |
| L P Kohlman Limited | Transport & logistics | 2024 |
| Lagrenneth Ltd | Information & communication | 2026 |
| Lamna Properties Limited | Professional & scientific | 2002 |
| LANTERN24 Homes Ltd | Real estate | 2021 |
| Lasha Ltd | Wholesale & retail | 2023 |
| Lathorien Properties Limited | Professional & scientific | 2005 |
| Lauretz Trustees Limited | | 2025 |
| Lawsams Ltd | Health & social care | 2026 |
| Leasing Programmes Limited | Administrative & support | 1991 |
| Ledger Management Ltd. | Professional & scientific | 1996 |
| LEE Dunkley Wealth Management Ltd | Professional & scientific | 2020 |
| Less Obvious Music Ltd | Information & communication | 2017 |
| Level Construction (South West) Limited | Construction | 2022 |
| Lewis (Holdings) Limited | Real estate | 2013 |
| Lewis Brown Limited | Professional & scientific | 2001 |
| Life Central Ltd | Other services | 2010 |
| Limab (UK) Limited | Wholesale & retail | 2007 |
| Ling Shooting Limited | Arts & recreation | 2003 |
| Linklease Limited | Real estate | 1997 |
| Lipa Solutions UN Limited | Information & communication | 2024 |
| Little Peg's Clothes Limited | Wholesale & retail | 2012 |
| Live Blood Online Ltd | Wholesale & retail | 2023 |
| Lloyd Care Limited | Health & social care | 2021 |
| Logic Distribution Limited | Other services | 2009 |
| Lomond Hall Management Limited | Households | 2004 |
| LON Rogo Ltd | Information & communication | 2022 |
| Long Reach Tactical Ltd | Wholesale & retail | 2024 |
| Looking Glass Lighting Ltd | Arts & recreation | 2015 |
| Loop Farm Livery Limited | Real estate | 2017 |
| Loose Ends (Wellington) Limited | Other services | 2010 |
| Love Your Nails Limited | Other services | 2011 |
| Lower Easton Farm Limited | Agriculture & fishing | 2018 |
| LRR Logistic Ltd | Transport & logistics | 2025 |
| LRT Medical Solutions Limited | Education | 2026 |
| LT Vent Ltd | Construction | 2020 |
| LTV Investments Ltd | Construction | 2022 |
| Luna Crafts Supplier UK Limited | Wholesale & retail | 2021 |
| Lutyens Advisory Limited | Professional & scientific | 2017 |
| LUV Dogz Ltd | Wholesale & retail | 2013 |
| M & J Pyne (Wholesale Division) Limited | Wholesale & retail | 2014 |
| M & J Pyne Holdings Limited | Real estate | 2014 |
| M & J Pyne Limited | Wholesale & retail | 2009 |
| M a and R G Tucker Limited | Hospitality | 2025 |
| M Graham Contractors Limited | Construction | 2015 |
| M J Purle Ltd | Wholesale & retail | 2016 |
| M J Tucker Limited | Professional & scientific | 2005 |
| M Jones Utilities Limited | Construction | 2022 |
| M M I Building Services Limited | Construction | 2005 |
| M R Hendy Limited | Agriculture & fishing | 2002 |
| M Y Services Holdings Ltd | Financial services | 2025 |
| M Y Services Southwest Ltd | Agriculture & fishing | 2025 |
| M.K. Test Systems Ltd. | Manufacturing | 1992 |
| Macaw Fine Ales Limited | Manufacturing | 2022 |
| Machine Tool Resources Ltd | Manufacturing | 2017 |
| Macksmith Limited | Professional & scientific | 2007 |
| Macromia Aviation Ltd | Professional & scientific | 2025 |
| Maesbrook ND Limited | Wholesale & retail | 2026 |
| Magenta Alarm & Security Systems Ltd | Administrative & support | 2023 |
| Magic Trike Event Hire Ltd | Hospitality | 2025 |
| Magill Associates Limited | Administrative & support | 2011 |
| Maitland Farmers (Loop) Limited | Agriculture & fishing | 2017 |
| Makoto Zushi Ltd | Hospitality | 2022 |
| Mallory Developments Limited | Construction | 2014 |
| Mandy Remote Trading Ltd | Wholesale & retail | 2024 |
| Many Hands Brew Co Ltd | Manufacturing | 2024 |
| Market GAP Ltd | Other services | 2006 |
| Marlin Cars Ltd | Manufacturing | 2021 |
| Marshalls Plumbing and Heating SW Ltd | Construction | 2023 |
| Marshwood Homes Ltd. | Construction | 1999 |
| Mass Publication Ltd | Information & communication | 2017 |
| Matt Durbin Associates Limited | Construction | 2011 |
| Matt Fiddes Southwest LLP | | 2016 |
| MAY (Priorton) Limited | Agriculture & fishing | 1960 |
| Mayfair Telecom Investments Ltd | Administrative & support | 2021 |
| Mayfield Property Investments Limited | Real estate | 2015 |
| Mayflower Bathrooms Limited | Wholesale & retail | 2006 |
| Mayflower Group Holdings Limited | Financial services | 2024 |
| Mayflower KBB Group Limited | Financial services | 2024 |
| Mayflower KBB Group Trustees Limited | Professional & scientific | 2024 |
| Mayflower KBB Limited | Manufacturing | 1999 |
| Mayflower Properties (SW) Limited | Construction | 2004 |
| Mayline Conversions Ltd | Manufacturing | 2015 |
| MBM Publishing Ltd | Information & communication | 2013 |
| MC Installations (South West) Limited | Construction | 2018 |
| Meadows and Minds Ltd | Health & social care | 2024 |
| Medgear Ltd | Health & social care | 2026 |
| Medipal ID Limited | Information & communication | 2014 |
| MEG King's Business Services Limited | Professional & scientific | 1994 |
| Meta Electrical Limited | Manufacturing | 2022 |
| Metal Developments Limited | Manufacturing | 2003 |
| MF P3MCC Ltd | Professional & scientific | 2025 |
| MHC SW Limited | Professional & scientific | 2025 |
| Middle Chipley Farm Barns Management Company Limited | Administrative & support | 2009 |