| Lower Weare Livery Limited | Agriculture & fishing | 2021 |
| Lower Wick Farm Cottages Limited | Real estate | 2024 |
| Lowering the Bar CIC | Administrative & support | 2022 |
| Lowlight Labs Ltd | Information & communication | 2026 |
| Loxley Travel Limited | Administrative & support | 2019 |
| LP Goalkeeping Academy Ltd | Arts & recreation | 2023 |
| LP Property Lets Limited | Real estate | 2023 |
| LS B2B Consultancy Limited | Administrative & support | 2024 |
| LS B2B Consultancy Settlements Limited | Administrative & support | 2025 |
| LS Digital Consulting Ltd | Information & communication | 2025 |
| LS Elite Pubs Ltd | Hospitality | 2018 |
| Ls-Electrics Ltd | Construction | 2015 |
| LTR Solutions Ltd | Financial services | 2014 |
| Lucas Waste Removals Ltd | Water & waste | 2026 |
| Lucassio Ltd | Transport & logistics | 2024 |
| Lucian Ionut Transport Ltd | Transport & logistics | 2025 |
| Lucky Sevens Consultancy Ltd | Other services | 2022 |
| Lucy Sarah Ltd | Health & social care | 2023 |
| Ludacrust Ltd | Hospitality | 2023 |
| Luke Jones Master Thatcher Ltd | Wholesale & retail | 2008 |
| Luma Pro Ltd | Transport & logistics | 2026 |
| Lumière-Baby Ltd | Wholesale & retail | 2025 |
| Luna Homes & Development Ltd | Construction | 2024 |
| Luna Property and Landscape Ltd | Administrative & support | 2022 |
| Luna Stone Trading Ltd | Wholesale & retail | 2023 |
| Lundie Construction Operations Ltd | Administrative & support | 2018 |
| Lush Puppies Ltd | Other services | 2024 |
| Luwa Ltd | Professional & scientific | 2020 |
| Luxon Trading Limited | Wholesale & retail | 2026 |
| Luxury Time Supply Ltd | Wholesale & retail | 2025 |
| Luxy Poperty Ltd | Real estate | 2025 |
| Lvlx Fitness Ltd | Wholesale & retail | 2024 |
| LWN Properties Ltd | Real estate | 2025 |
| Lycean Solutions Ltd | Professional & scientific | 2023 |
| Lydford House Weston-Super-Mare Flat Management Company (1994) Limited | Households | 1994 |
| Lympsham Manor Farm Limited | Agriculture & fishing | 2011 |
| Lynch Court (Winscombe) Management Limited | Households | 1992 |
| Lyndfield Services Limited | Professional & scientific | 2010 |
| Lynkpay Finance Ltd | Information & communication | 2021 |
| Lynkpay Ltd | Information & communication | 2021 |
| M & C Fish Bar Limited | Hospitality | 2010 |
| M & J Property Developments Limited | Real estate | 2003 |
| M & W Investments Limited | Construction | 1972 |
| M D Specialist Plumbing and Heating Ltd | Construction | 2021 |
| M G Counselling & Psychotherapy Ltd | Health & social care | 2026 |
| M Hemmens Transport Limited | Transport & logistics | 2014 |
| M J Plumbing and Heating SW Ltd | Construction | 2024 |
| M Mobiles Ltd | Wholesale & retail | 2018 |
| M S Poyntz-Wright Electrical Services Ltd | Administrative & support | 2017 |
| M T Games Limited | Wholesale & retail | 2002 |
| M&A Clean Ltd | Administrative & support | 2024 |
| M&C Cleaning Solutions Limited | Administrative & support | 2026 |
| M&C Family Ltd | Real estate | 2026 |
| M&C Pet Supplies Limited | Wholesale & retail | 2020 |
| M&E Works Ltd | Construction | 2022 |
| M&L Products Limited | Manufacturing | 2020 |
| M&S Carpentry and Joinery Ltd | Construction | 2016 |
| M.C. Developments (South West) Limited | Construction | 2014 |
| M.I.C. Haulage Ltd | Transport & logistics | 2014 |
| M.O.B Support Limited | Health & social care | 2022 |
| M.O.M. Plastering Limited | Construction | 2006 |
| M.S Orava Logistic Ltd | Transport & logistics | 2024 |
| MAB Holdings Limited | Financial services | 2022 |
| Maclean Consultancy Limited | Administrative & support | 2019 |
| Maclean Property Holdings Limited | Real estate | 2022 |
| Mactra Marine Limited | Water & waste | 2014 |
| Mactra Shop Equipment & Fittings Limited | Construction | 1999 |
| Madebywave Limited | Arts & recreation | 2016 |
| MAG International Limited | Wholesale & retail | 1997 |
| Magda Locums Ltd | Health & social care | 2018 |
| Mains Plumbing & Heating Ltd | Construction | 2014 |
| Mainwaring Systems Limited | Arts & recreation | 1995 |
| Maisonstori Ltd | Professional & scientific | 2009 |
| Malago Residents Management Company Ltd | Households | 2018 |
| Malikinyota Ltd | Agriculture & fishing | 2021 |
| Maltings Nailsworth Management Co Ltd | Households | 2023 |
| Malvern Asset Management Ltd | Real estate | 2014 |
| Malvern Lettings Ltd | Real estate | 2020 |
| Malvern Property Holdings Ltd | Real estate | 2019 |
| Mama Bear Gifts Ltd | Manufacturing | 2025 |
| Mama Lait Limited | Wholesale & retail | 2025 |
| MAN Logistics Ltd | Transport & logistics | 2021 |
| Managing Strategic Change Limited | Professional & scientific | 2009 |
| Mandala Projects Ltd | Real estate | 2019 |
| Manna Pharma Ltd | Agriculture & fishing | 2026 |
| Manor Court (Burnham on Sea) Management Limited | Households | 1993 |
| Manor Mead Freehold Limited | Real estate | 2014 |
| Manordene Management Company Limited | Households | 2000 |
| Mansfield Site Support Limited | Construction | 2014 |
| Mant's Kitchen Ltd | Hospitality | 2025 |
| MAP Industries Ltd | Construction | 2017 |
| Maple Court Limited | Households | 1974 |
| Mapseeker Digital Ltd | Manufacturing | 2018 |
| Mar&Lau Trans Ltd | Transport & logistics | 2018 |
| Marc Hartley Construction Limited | Construction | 1999 |
| Marc Hartley Properties Limited | Real estate | 2019 |
| Marching on Media Limited | Information & communication | 2019 |
| Mareczek Limited | Transport & logistics | 2011 |
| Margetts & Margetts Ltd | Construction | 2014 |
| Maria & Mihai Transport Limited | Wholesale & retail | 2014 |