| Linemore Trading Limited | Wholesale & retail | 2024 |
| Lingate Trading Limited | Manufacturing | 2026 |
| Lingua Learn (Cambridge) Ltd | Education | 2024 |
| Link Creative Services Limited | Administrative & support | 2011 |
| Lion & Star Ltd | Construction | 2016 |
| Liquid Skills Ltd | Arts & recreation | 2017 |
| Lisa Grant Consulting Ltd | Professional & scientific | 2019 |
| Listers (Sussex) Limited | Agriculture & fishing | 1956 |
| Lite Trac Products Limited | Extraterritorial | 2026 |
| Lithan Investment Limited | Health & social care | 2021 |
| Little Light Bearers Ltd | Education | 2023 |
| Little Munchkins (Huntingdon) Limited | Education | 2016 |
| Little Ones Cheesecake Emporium Ltd | Hospitality | 2018 |
| Little Wrens Nest Ltd | Wholesale & retail | 2023 |
| Littleaqua Cambridgeshire Limited | Education | 2020 |
| Littleaqua Huntingdonshire Limited | Education | 2020 |
| Littleaqua Swim Limited | Education | 2023 |
| Live Sound Limited | Information & communication | 2021 |
| Live Vitae Financial Planning Ltd | Professional & scientific | 2021 |
| Livebites Ltd | Hospitality | 2025 |
| Living 4 Aviation Ltd | Transport & logistics | 2016 |
| LIZ Greenhalgh Ltd | Professional & scientific | 2021 |
| Lizzie MAY Ltd | Wholesale & retail | 2023 |
| LJ Leisure Ltd | Hospitality | 2018 |
| LJC Childcare Ltd | Health & social care | 2024 |
| LJI Properties Ltd | Real estate | 2026 |
| LJL Distribution Ltd | Professional & scientific | 2023 |
| LK & J Limited | Extraterritorial | 2023 |
| LKC Homes Ltd | Real estate | 2025 |
| LKK Transport Ltd | Transport & logistics | 2014 |
| LLV Services Ltd | Health & social care | 2025 |
| LML Trading Ltd | Wholesale & retail | 2025 |
| LMP Accountancy Limited | Professional & scientific | 2005 |
| Lmtrm Consulting Ltd | Administrative & support | 2013 |
| Local Cafe Limited | Hospitality | 2026 |
| Lochailort Ampthill Limited | Construction | 2012 |
| Lochailort Fairfield Limited | Construction | 2016 |
| Lociva UK Ltd | Information & communication | 2022 |
| Lock Bookkeeping Ltd | Professional & scientific | 2014 |
| Locke HR Limited | Professional & scientific | 2022 |
| Lodestone Ampersand Limited | Real estate | 2019 |
| Lodestone Echo Limited | Real estate | 2019 |
| Lodestone Star Limited | Financial services | 2019 |
| Lodestone Trading Limited | Real estate | 2014 |
| Lodge Farm Enterprises Ltd | Professional & scientific | 2011 |
| Logistics Business Publishing Ltd | Administrative & support | 2007 |
| Logistics Cougar Ltd | Wholesale & retail | 2021 |
| Logistics Strategy Consulting Limited | Professional & scientific | 2021 |
| London House Signs Limited | Other services | 2002 |
| Londubh Limited | Professional & scientific | 2019 |
| Long Reach Lake Water Sports Club Ltd | Arts & recreation | 2015 |
| Long Shot Farm Ltd | Agriculture & fishing | 2023 |
| Lonhyd Limited | Real estate | 2021 |
| Looker Energy Limited | Energy | 2014 |
| Lordgate Engineering Limited | Manufacturing | 1998 |
| Lori Ltd | Transport & logistics | 2017 |
| Lotus and Lily Limited | Wholesale & retail | 2025 |
| Louise W Ltd | Hospitality | 2025 |
| Love Your LET Limited | Real estate | 2017 |
| Lovell Lofts & Solar Ltd | Construction | 2023 |
| Lowery Close Management Co Ltd | Households | 1999 |
| LOZ a PIE Ltd | Hospitality | 2022 |
| LPS Plumbing Limited | Construction | 2016 |
| Lucas & Co Property Ltd | Real estate | 2025 |
| Lucian-Ioan Ltd | Transport & logistics | 2026 |
| Lucida Futurum Ltd | Administrative & support | 2014 |
| Lucky Food Market Ltd | Manufacturing | 2024 |
| Luke DEV Ltd | Information & communication | 2024 |
| Luke Seymour Ltd | Wholesale & retail | 2016 |
| Lularon CIC | Arts & recreation | 2021 |
| Lumen Consulting Limited | Information & communication | 2025 |
| Luminos AI Ltd | Information & communication | 2026 |
| Luminus Property Ltd | Real estate | 2025 |
| Lunar Innovation Limited | Administrative & support | 2017 |
| Lunch Ghost Ltd | Information & communication | 2022 |
| Luvbutton Limited | Arts & recreation | 2007 |
| LW Electrical and Environmental Systems Ltd | Construction | 2023 |
| LXD Fitness Global Ltd | Arts & recreation | 2023 |
| LXD Fitness Limited | Manufacturing | 2018 |
| Lyme Bay Leisure Ltd | Hospitality | 2013 |
| Lynchwood Diagnostics Limited | Other services | 2010 |
| M & C Holdings Limited | Professional & scientific | 2016 |
| M & D Flooring Ltd. | Wholesale & retail | 2005 |
| M & E Logistics Limited | Transport & logistics | 2019 |
| M & E Recovery Ltd | Transport & logistics | 2023 |
| M & J Abbs Limited | Construction | 2010 |
| M & J RAY Limited | Agriculture & fishing | 2000 |
| M & O Carpentry Ltd | Construction | 2015 |
| M & R Sutton Developments Limited | Construction | 2017 |
| M & R Sutton Limited | Construction | 2005 |
| M and D Burrell Ltd | Hospitality | 2015 |
| M C Windows Anglia Limited | Construction | 2003 |
| M Cambridge Ltd | Real estate | 2012 |
| M DEC Maintenance Limited | Construction | 1992 |
| M FOX Builders Limited | Construction | 2019 |
| M H East & Sons Limited | Construction | 2016 |
| M H Heat-Tech Limited | Construction | 2003 |
| M Harvey Training Ltd | Professional & scientific | 2025 |
| M J Groundworks & Civils Ltd | Construction | 2025 |
| M P James Limited | Construction | 2015 |