| Livingthedreamholidays Ltd | Administrative & support | 2025 |
| LJ Brickworks Yorkshire Ltd | Construction | 2021 |
| LJS Fire & Security Ltd | Administrative & support | 2026 |
| LKK Partner Ltd | Hospitality | 2017 |
| LM Harrison Limited | Real estate | 2018 |
| Lockwood Engineers Ltd | Manufacturing | 2018 |
| Loft and Daughter Limited | Wholesale & retail | 2024 |
| Logical Element Ltd | Professional & scientific | 2023 |
| Lola Poppy Ltd | Extraterritorial | 2024 |
| Lorinton Limited | Real estate | 2012 |
| Lottie Crane Limited | Agriculture & fishing | 2020 |
| Loversall Farm Day Nursery Limited | Extraterritorial | 2012 |
| LOW Moorgate Garage Ltd | Wholesale & retail | 2023 |
| Lowry Developments (Yorkshire) Ltd | Construction | 2021 |
| LRN Inspection Services Ltd | Professional & scientific | 2026 |
| LRS (Mortgage Solutions) Limited | Financial services | 2004 |
| Luminis Consulting Ltd | Professional & scientific | 2025 |
| Lumley Properties Scarborough Ltd | Real estate | 2024 |
| Luna Restaurant CF Ltd | Hospitality | 2025 |
| Lund Gates Limited | Manufacturing | 2021 |
| Lundforest Partnership Limited | Agriculture & fishing | 2021 |
| Luxury Leisure Parks Limited | Hospitality | 2020 |
| M & J Hayhurst Construction Limited | Construction | 1997 |
| M & J Hayhurst Ltd | Agriculture & fishing | 2003 |
| M & J Scholefield Property Limited | Real estate | 2023 |
| M Bramhall Ltd | Professional & scientific | 2022 |
| M&B Performance Ltd | Wholesale & retail | 2021 |
| M&N Rufc Trading and Supporters Club Ltd | Arts & recreation | 2024 |
| M&R Vehicle Sales Ltd | Wholesale & retail | 2024 |
| M&Tcd Services Ltd | Administrative & support | 2022 |
| M. G. Flather Limited | Financial services | 2023 |
| M.P.J. (Licensing) Limited | Professional & scientific | 2013 |
| M1 Property Limited | Real estate | 2020 |
| MA & CE Catering Limited | Hospitality | 2026 |
| Maasiha.Com Limited | Professional & scientific | 2018 |
| Macleod Mann Limited | Construction | 2019 |
| MAE & Co Cosmetics Ltd | Wholesale & retail | 2025 |
| Magus Strategic Communications Limited | Professional & scientific | 2002 |
| Maietta Consulting Ltd | Professional & scientific | 2004 |
| Maison DE Barnes Ltd | Construction | 2022 |
| Major Oak International Ltd | Wholesale & retail | 2024 |
| Major Oak Joint Ventures Ltd | Financial services | 2024 |
| Major Oak UK Holdings Limited | Financial services | 2025 |
| Major Oak Ventures Ltd | Financial services | 2014 |
| Malinka Malton Ltd | Wholesale & retail | 2022 |
| Malton & Norton Golf Club Ltd | Education | 2017 |
| Malton & Norton Rugby Union Football Club Limited | Arts & recreation | 2026 |
| Malton a R C Limited | Extraterritorial | 2023 |
| Malton Amenity CIC | Administrative & support | 2011 |
| Malton Autoelectrics Limited | Wholesale & retail | 2003 |
| Malton Deli Ltd | Hospitality | 2016 |
| Malton Equine Laundry Limited | Other services | 2010 |
| Malton Fine Art Ltd | Other services | 2024 |
| Malton Fitness and Wellness Centre Ltd | Arts & recreation | 2019 |
| Malton Office Supplies Limited | Wholesale & retail | 2017 |
| Malton Phones & Repair Centre Ltd | Wholesale & retail | 2022 |
| Malton Relish Ltd | Wholesale & retail | 2007 |
| Malton Soft Play LLP | | 2020 |
| Malton Vineyard Ltd | Manufacturing | 2021 |
| Mansion Nightclub Ltd | Hospitality | 2012 |
| MAP Arch Homes Ltd | Households | 2020 |
| MAP Archaeological Practice Ltd. | Professional & scientific | 2011 |
| Marcus Rowe Holdings Limited | Financial services | 2024 |
| Mari-Aurelian Manafu Ltd | Construction | 2024 |
| Marinas and Moorings UK Limited | Transport & logistics | 2018 |
| Mark Langrish Ltd | Construction | 2019 |
| Martin Johnson & Co (York) Limited | Manufacturing | 2005 |
| Martin Johnson Holdings (York) Limited | Extraterritorial | 2004 |
| Matt Messias Impact Leadership Ltd | Professional & scientific | 2018 |
| MB Steelworks Ltd | Construction | 2024 |
| Mb&E Real Estate Ltd | Real estate | 2024 |
| Mcclarrons Limited | Financial services | 1974 |
| Mcclarrons Sport Limited | Financial services | 2018 |
| Mccreery Ward Enterprise Ltd | Real estate | 2025 |
| Meat City Smokers Limited | Manufacturing | 2025 |
| Medforth Farming Limited | Agriculture & fishing | 2012 |
| Medical Transfer Ambulance Service Ltd | Professional & scientific | 2015 |
| MEI Pump Services Ltd | Water & waste | 2013 |
| Mennell Motors Limited | Wholesale & retail | 2006 |
| Mercury HMI Limited | Manufacturing | 2015 |
| Merlin Metals Limited | Wholesale & retail | 2015 |
| Merlin Trading UK Limited | Energy | 2008 |
| Methuen & Co Limited | Professional & scientific | 2004 |
| Methuen Publishing Limited | Information & communication | 1998 |
| Miamia Holdings Limited | Financial services | 2025 |
| Michael Andrew of York Limited | Other services | 2010 |
| Microwave Projects Limited | Manufacturing | 2021 |
| Midsummer Camping & Caravanning Ltd | Hospitality | 2024 |
| Mike Pannett Limited | Information & communication | 2023 |
| Milani Aesthetics Ltd | Other services | 2024 |
| Milky Wayne Ltd | Wholesale & retail | 2024 |
| Mill Pensions Limited | Professional & scientific | 2015 |
| Milly Grace Ltd | Wholesale & retail | 2020 |
| Milton Fish & Chips 1 Ltd | Hospitality | 2026 |
| Milton Fish & Chips 2 Ltd | Hospitality | 2026 |
| Minniedale Projects Limited | Construction | 2022 |
| MJ Auto Solutions Ltd | Professional & scientific | 2020 |
| MJA Joinery & Renovations Ltd | Manufacturing | 2026 |
| ML Norton Management Company Limited | Extraterritorial | 2014 |
| MM Investments (Yorkshire) Limited | Extraterritorial | 2015 |