| Leila's Kitchen Limited | Hospitality | 2022 |
| Lemon Moose Games Ltd | Information & communication | 2012 |
| LEN Hall Chemical Consultants Limited | Administrative & support | 2008 |
| Lennox Foods Ltd | Manufacturing | 2019 |
| Letchford Estates Limited | Real estate | 2022 |
| Lewis Storage LLP | | 2010 |
| LH Electrical Solutions Ltd | Construction | 2025 |
| Lhamo's Taste of the East Ltd | Wholesale & retail | 2020 |
| Lidscan Limited | Other services | 2022 |
| Life Financial Planning Limited | Financial services | 2009 |
| Life Wills and Trusts Ltd | Professional & scientific | 2021 |
| Lifestyle Yorkshire Ltd | Wholesale & retail | 2018 |
| Light-It-Up Entertainment Company Limited | Information & communication | 2017 |
| Litemania.Co.Uk Limited | Wholesale & retail | 2008 |
| Little Box Kitchen Limited | Manufacturing | 2017 |
| Littlehonda Ltd | Arts & recreation | 2002 |
| Live Wild CIC | Professional & scientific | 2019 |
| Lives on Medical Consultancy and Education Limited | Professional & scientific | 2018 |
| LML Security Services Ltd | Administrative & support | 2025 |
| LOCATE4U Limited | Real estate | 2024 |
| Lola & Frank Designs Limited | Manufacturing | 2024 |
| Longfield Developments Ltd | Construction | 2011 |
| Longfield Estates Ltd | Real estate | 2024 |
| Losource Limited | Information & communication | 2002 |
| Lotus Nails & Spa (HX) Limited | Other services | 2022 |
| Lovoro Construction Ltd | Construction | 2024 |
| LOW Carbon Products Limited | Manufacturing | 2009 |
| LRX Mechanical Services Ltd | Construction | 2014 |
| LS Audio Tech Limited | Wholesale & retail | 2007 |
| Ltfr Limited | Professional & scientific | 2023 |
| Luddendenfoot Properties Limited | Real estate | 2012 |
| Luke W. Harlow Ltd | Professional & scientific | 2024 |
| Lysten Limited | Financial services | 2014 |
| Løfte Home Limited | Wholesale & retail | 2020 |
| M & R Trading Limited | Wholesale & retail | 2018 |
| M. S. S. (Carpets & Furniture) Limited | Real estate | 1981 |
| MA Plastering & Electrical Services Limited | Construction | 2017 |
| Mace 8 Ltd | Construction | 2020 |
| Machine Knit Community Ltd | Education | 2024 |
| Made in the Valley Co-Operative Ltd | Arts & recreation | 2014 |
| Magic-Tipz Limited | Manufacturing | 2019 |
| Magic-Trix Limited | Manufacturing | 2018 |
| Maiken Property Ltd | Real estate | 2025 |
| Make That Change Limited | Other services | 2015 |
| Makiropr Ltd | Real estate | 2018 |
| Male Allies Challenging Sexism CIC | Education | 2022 |
| Manor House Consultancy Ltd | Professional & scientific | 2017 |
| MAR Family Ltd | Professional & scientific | 2022 |
| Matt Dawson Cricket Consultancy Ltd | Education | 2025 |
| MAX Clock Cards Limited | Manufacturing | 1991 |
| Mayroyd Moorings Boat Club Ltd | Arts & recreation | 2024 |
| MB Tech Ltd | Wholesale & retail | 2024 |
| Mdfs Retail Ltd | Education | 2024 |
| MDK Asset Management Ltd | Real estate | 2023 |
| Mean Time Development Ltd | Information & communication | 2019 |
| Medievent UK Ltd | Health & social care | 2022 |
| Meera Dental Ltd | Health & social care | 2022 |
| Meissner Bolte (UK) Limited | Professional & scientific | 2004 |
| Melbourne Mill (Apartment Management) Limited | Real estate | 2004 |
| Mellita Limited | Administrative & support | 2006 |
| Melton IT Services Ltd | Information & communication | 2001 |
| Meritz Trading Limited | Arts & recreation | 2016 |
| Meta Metal Limited | Information & communication | 2003 |
| Method Acting Ltd | Education | 2025 |
| Metropolis Interiors Ltd | Wholesale & retail | 2010 |
| Microsearch Holdings Limited | Financial services | 2017 |
| Middleton Bros Limited | Real estate | 2017 |
| Milner Homes Limited | Agriculture & fishing | 1980 |
| Mind Mending Therapies Ltd | Health & social care | 2023 |
| Mindful Democratic Education C.I.C. | Health & social care | 2025 |
| Mindscape Therapeutic Counselling Ltd | Health & social care | 2022 |
| Miranda Cowan Ecology Ltd | Professional & scientific | 2016 |
| Mitchell Excavations Limited | Construction | 2006 |
| MJJ Roofing Limited | Construction | 2021 |
| MM & JL Trading Limited | Wholesale & retail | 2012 |
| Moddable Limited | Information & communication | 2025 |
| Moderna Business Park Limited | Real estate | 2010 |
| Mooch on Market Street Ltd. | Hospitality | 2012 |
| Moonfull Ltd | Information & communication | 2021 |
| Moor Moves Limited | Real estate | 2006 |
| Moorland Futures Ltd | Financial services | 2024 |
| Moreton Deakin Associates Limited | Professional & scientific | 2002 |
| Moreton-Deakin Developments Limited | Extraterritorial | 2006 |
| Mosaic ME Ltd | Construction | 2022 |
| Mosiunits.Co.Uk Ltd | Real estate | 2011 |
| Mother Culture Ltd | Manufacturing | 2023 |
| Mount Skip Properties Limited | Real estate | 1970 |
| MTD Store Ltd | Professional & scientific | 2026 |
| Mud-Uk Ltd | Wholesale & retail | 2009 |
| Mugen GEO Ltd | Professional & scientific | 2011 |
| Muir Hunter Consultancy Ltd | Professional & scientific | 2025 |
| Murts Motor Centre Limited | Wholesale & retail | 2014 |
| Mvhw Solutions Ltd | Information & communication | 2020 |
| My Novelty Gift Ltd | Wholesale & retail | 2016 |
| Myob Users Limited | Other services | 2011 |
| Mytholm Forestry Ltd. | Agriculture & fishing | 2022 |
| Mytholmroyd Gym Limited | Arts & recreation | 2019 |
| N Searle Limited | Information & communication | 2007 |
| N&R Demolitions and Industrial Dismantlers Limited | Construction | 2016 |
| Najimukhtar Limited | Hospitality | 2023 |