| LIC UK Ltd | Wholesale & retail | 2024 |
| Lidiamihaela Ltd | Health & social care | 2019 |
| Liealor Limited | Wholesale & retail | 2026 |
| Life's Energy Ltd | Construction | 2011 |
| Lifttec Limited | Manufacturing | 2017 |
| Lilly's Reptile Rescue CIC | Professional & scientific | 2025 |
| Lilywood Farm Ltd | Agriculture & fishing | 2024 |
| Limelight Survey & Valuation Ltd | Other services | 2020 |
| Limitless Health and Fitness Ltd | Arts & recreation | 2025 |
| Lindhead OUT of School Club | Other services | 2007 |
| Lingholm Farming Limited | Agriculture & fishing | 2013 |
| Linnaeus Limited | Financial services | 2001 |
| Lionheart House Limited | Real estate | 2017 |
| Lisa Ponter Education Ltd | Education | 2021 |
| Litmus Management Services Limited | Professional & scientific | 2024 |
| Litmus-Wilne Limited | Construction | 2025 |
| Little 'N' Large Entertainment Ltd | Administrative & support | 2018 |
| Little 15 Limited | Wholesale & retail | 2023 |
| Little and LUX Ltd | Manufacturing | 2026 |
| Little Footsteps Limited | Health & social care | 2011 |
| Littleboy Developments Limited | Real estate | 2023 |
| Littleboy Estates Limited | Real estate | 2006 |
| Littleboy Investments Limited | Financial services | 2025 |
| Littleboy's Limited | Wholesale & retail | 2010 |
| Littleouse Design Ltd | Real estate | 2006 |
| LJH Restoration & Development Ltd | Construction | 2021 |
| LJM Care Services Ltd | Public administration | 2026 |
| LMW Properties (Northern) Ltd | Real estate | 2024 |
| Lnwm Limited | Professional & scientific | 2017 |
| Loafers Shoes Ltd | Wholesale & retail | 2014 |
| Loansdean Hill Limited | Professional & scientific | 2015 |
| Lobstore Limited | Agriculture & fishing | 2014 |
| Loch Lomond Heritage Limited | Wholesale & retail | 2012 |
| Locked & Loaded Ltd | Real estate | 2024 |
| Locked-Up Ltd | Real estate | 2020 |
| Lockglen Builders Limited | Real estate | 1968 |
| Locl Developments Ltd | Real estate | 2021 |
| Locl Properties Ltd | Real estate | 2020 |
| Lode Logistics Consulting Limited | Professional & scientific | 2025 |
| Logo High Ltd | Professional & scientific | 2018 |
| Logolight Flat Management Company Limited | Households | 1990 |
| Lokaiz Ltd | Professional & scientific | 2022 |
| Long Term Care Coach Ltd | Administrative & support | 2002 |
| Longshaw Lodge Limited | Households | 1961 |
| Lontl Darley Limited | Wholesale & retail | 2025 |
| Lookout on the Pier Limited | Hospitality | 2021 |
| Lost & Found Projects Ltd | Wholesale & retail | 2022 |
| Louise Bailey Ltd | Wholesale & retail | 2021 |
| Love My Hair (Kirkbymoorside) Ltd | Other services | 2021 |
| LOW Park Farm (Ebberston) Limited | Agriculture & fishing | 2014 |
| LOW View Management Company Limited | Real estate | 2007 |
| Lowdales Property Limited | Real estate | 2025 |
| Lowen Engineering Services Ltd | Professional & scientific | 2024 |
| Lowfield Ltd | Health & social care | 2023 |
| LT House Removals Limited | Water & waste | 2025 |
| LTS Treework Limited | Administrative & support | 2015 |
| Luca & Salvo Limited | Hospitality | 2019 |
| Luca Bolovan Ltd | Transport & logistics | 2025 |
| Lucy Holdings Ltd | Real estate | 2017 |
| Lucy Raine Ltd | Professional & scientific | 2021 |
| Lueur 145 Beauty Limited | Real estate | 2024 |
| Luma Property Services Ltd | Real estate | 2024 |
| Lumi Installations Ltd | Construction | 2022 |
| Luna Developments Yorkshire Ltd | Construction | 2024 |
| Luna Investment Properties Ltd | Real estate | 2025 |
| Luna Management Group Limited | Professional & scientific | 2025 |
| Luna Park Leisure Ltd | Arts & recreation | 2019 |
| Lunatan Limited | Hospitality | 2025 |
| Lund Court Farm Limited | Agriculture & fishing | 1985 |
| Luxe Holiday Apartments Limited | Hospitality | 2022 |
| Lyall & Jones Builders Limited | Construction | 2018 |
| Lyco Holdings Ltd | Financial services | 2025 |
| Lzrehab Ltd | Health & social care | 2020 |
| Lùth Consulting Limited | Professional & scientific | 2017 |
| M & J Boyers & Sons Limited | Wholesale & retail | 2007 |
| M & K Ward Holdings Limited | Financial services | 2026 |
| M & M Haulage Services Limited | Transport & logistics | 2000 |
| M D Huggins Limited | Real estate | 2014 |
| M Ireland Building Contractors Limited | Construction | 2025 |
| M J Builders (Scarborough) Limited | Administrative & support | 2006 |
| M J Lewis Civil Engineering Ltd | Construction | 2014 |
| M K Soft Drinks Limited | Wholesale & retail | 2003 |
| M Pinder Joinery and Fencing Limited | Construction | 2012 |
| M&Ji Ltd | Health & social care | 2015 |
| M.A.W Property Lettings (Whitby) Ltd | Real estate | 2025 |
| M.B.S. Contract Services Ltd | Financial services | 2019 |
| M2 Decorators Ltd | Other services | 2025 |
| Macc Music Ltd | Information & communication | 2009 |
| Maccaroo Ltd | Wholesale & retail | 2014 |
| Madhatters Early Years Care Ltd | Education | 2012 |
| Maggie Cork and Associates Ltd. | Professional & scientific | 2009 |
| Magic Mike Limited | Arts & recreation | 2002 |
| Mainhaul Ltd | Transport & logistics | 2025 |
| Mainprize Asia Ltd | Mining & quarrying | 2019 |
| Mainprize Holdings Limited | Transport & logistics | 2019 |
| Mainprize Midco 2 Limited | Other services | 2025 |
| Mainprize Midco 3 Limited | Other services | 2026 |
| Mainprize Midco 4 Limited | Other services | 2026 |
| Mainprize Midco Limited | Other services | 2024 |
| Mainprize Offshore Four Limited | Other services | 2026 |