| Limetree Living Ltd | Construction | 2013 |
| Limetree Real Estates Ltd | Construction | 2006 |
| Liminal POV Ltd | Information & communication | 2025 |
| Linc M&E Plumbing Limited | Construction | 2025 |
| Lincmark Limited | Wholesale & retail | 2007 |
| Lincmark Services Limited | Wholesale & retail | 2024 |
| Lincolnshire Youth Ballet Ltd | Arts & recreation | 2020 |
| Links PAY Services Ltd | Professional & scientific | 2025 |
| Links Recruitment Ltd | Administrative & support | 2012 |
| Liquid Products Limited | Wholesale & retail | 2017 |
| Liquid Testing 2020 Limited | Manufacturing | 2020 |
| Litehouse Properties Limited | Construction | 2020 |
| Little Green Media Ltd | Information & communication | 2026 |
| Little Splash Limited | Arts & recreation | 2017 |
| LL Gifts Ltd | Wholesale & retail | 2020 |
| LLL Rentprop Limited | Real estate | 2024 |
| LMB Construction Limited | Construction | 2016 |
| LN Support Solutions Ltd | Financial services | 2023 |
| Local Living Limited | Information & communication | 2002 |
| Lodge Stables Limited | Households | 2013 |
| Loggerton Holdings Ltd | Financial services | 2025 |
| Loggerton Investments Limited | Financial services | 2025 |
| Logication Ltd | Information & communication | 2009 |
| Logiclock Ltd | Arts & recreation | 2014 |
| Logstyle Services Limited | Administrative & support | 2003 |
| Lomax Consulting Limited | Information & communication | 2019 |
| Long Acres Boarding Ltd | Hospitality | 2002 |
| Longdog Media Ltd | Information & communication | 2018 |
| Longthorpe Landscape Services Limited | Administrative & support | 2010 |
| Lonsdale Commercial Ltd | Real estate | 2020 |
| Lonsdale Farming Ltd | Arts & recreation | 2020 |
| Lonsdale Residential Ltd | Real estate | 2020 |
| Lonsdale Talent Ltd | Arts & recreation | 2020 |
| Lotec Limited | Professional & scientific | 2011 |
| LP Films Limited | Information & communication | 2018 |
| LP Murals Limited | Arts & recreation | 2019 |
| LR Optional Equipment Limited | Wholesale & retail | 2019 |
| LSM (Stamford) Limited | Professional & scientific | 2014 |
| Lucia Garcia Studio Limited | Professional & scientific | 2024 |
| Lucinda Miller Interiors Ltd | Manufacturing | 2023 |
| Ludus Ltd | Real estate | 2017 |
| Luke Chudy Construction Ltd | Construction | 2025 |
| Luke Watson Plastering Ltd | Construction | 2026 |
| Lumennox Limited | Wholesale & retail | 2026 |
| Lumera Hospitality Limited | Hospitality | 2025 |
| Lumivara LLP | | 2024 |
| Luna and Leaf Ltd | Wholesale & retail | 2022 |
| Luova Consulting Ltd | Information & communication | 2012 |
| Lupine Limited | Real estate | 2020 |
| Lupo Audio Ltd | Manufacturing | 2018 |
| Luxecart Traders Ltd | Wholesale & retail | 2026 |
| Luxury Experiences Limited | Arts & recreation | 2023 |
| LVS Electrical Services Ltd | Construction | 2021 |
| M & S Sands Holdings Ltd | Financial services | 2022 |
| M B Window Solutions Limited | Construction | 2021 |
| M J Barnes Properties Ltd | Real estate | 2019 |
| M Saleem Group Ltd | Health & social care | 2023 |
| M W Edwards Groundworks Ltd | Extraterritorial | 2020 |
| M Y Accountancy (Stamford) Limited | Professional & scientific | 2016 |
| M.J.F Plastering & Drylining Ltd | Construction | 2026 |
| M.R.O.I. Limited | Professional & scientific | 2001 |
| M.W.G. Builders Limited | Construction | 2012 |
| Maca Holdings Ltd | Construction | 2017 |
| Macaulay Ferguson Ltd | Construction | 2017 |
| Macel Limited | Hospitality | 2025 |
| Maclaren Consulting Ltd | Professional & scientific | 2025 |
| Maddison Hill Estates Ltd | Real estate | 2026 |
| Made to Fit Ltd | Other services | 2014 |
| Madfins Ltd | Wholesale & retail | 2021 |
| MAE Services Ltd | Professional & scientific | 2022 |
| Maggie's Mates Ltd | Other services | 2021 |
| Magster Ltd | Financial services | 2023 |
| Mahi Commerce Ltd | Wholesale & retail | 2010 |
| Mainstreet Partnership Publications Ltd | Professional & scientific | 2014 |
| Maison Aubrac Ltd | Financial services | 2025 |
| Maison SO Limited | Manufacturing | 2026 |
| Majestic Heating & GAS Ltd | Construction | 2023 |
| Malandi Limited | Other services | 2012 |
| Malcolm Howdle Limited | Professional & scientific | 2013 |
| Mall Vision Holdings Ltd | Professional & scientific | 2016 |
| Mallard Point Limited | Agriculture & fishing | 2020 |
| Managespace (UK) Ltd | Information & communication | 2025 |
| Mancetter Square (Peterborough) Limited | Real estate | 2013 |
| Manifesting Property Ltd | Real estate | 2022 |
| Manor Advisory Ltd | Other services | 2019 |
| Manor Equity LLP | | 2026 |
| Manor Framing Limited | Manufacturing | 2010 |
| Manor Hill Estate Holdings Ltd | Financial services | 2026 |
| Manor House Media Ltd | Information & communication | 2021 |
| Manor Masonry LLP | | 2025 |
| Manorgrove Estates Limited | Real estate | 1987 |
| Marbara Group Ltd | Wholesale & retail | 2019 |
| Mariusz Export Ltd | Wholesale & retail | 2021 |
| Marquina Limited | Wholesale & retail | 2024 |
| Marshall's Yard Management Company Limited | Real estate | 2015 |
| Marshridge Kahn Limited | Wholesale & retail | 2011 |
| Martin Wade Construction Limited | Real estate | 2019 |
| Maruluki Solutions Ltd | Professional & scientific | 2025 |
| Marumia Ltd | Financial services | 2016 |
| Mash Finance (Group) Ltd | Financial services | 2021 |