| Labgoat Ltd | Wholesale & retail | 2023 |
| Labospace Limited | Professional & scientific | 2013 |
| Lacaze Ltd | Professional & scientific | 2020 |
| Laccaria Laccata Ltd | Administrative & support | 2008 |
| Lachwerk Limited | Health & social care | 2026 |
| Lackmead Ltd | Real estate | 2020 |
| LAH Plastering Limited | Construction | 2017 |
| LAK Designs Ltd | Arts & recreation | 2022 |
| Lake Creative Limited | Professional & scientific | 2008 |
| Lake Estates Watersports Limited | Manufacturing | 2023 |
| Lake Trust Property Ltd | Real estate | 2025 |
| Lakeside & Llandough Property Investments Limited | Financial services | 2015 |
| Lakeside and Llandough Development Co Limited | Real estate | 1960 |
| Lambe & Haines Enterprises Limited | Financial services | 2025 |
| Lambe & Haines Investment Property Limited | Real estate | 2003 |
| Lambe Contract Carpenters Ltd | Construction | 1998 |
| Lambinvest Limited | Financial services | 2025 |
| Lancaster Brickwork (Witney) Limited | Construction | 2010 |
| Lancaster Building & Developments Ltd | Construction | 2017 |
| Lancaster Homes (Oxford) Limited | Extraterritorial | 2021 |
| Land & Landscape Management Ltd | Professional & scientific | 2002 |
| Landac (Holdings) Limited | Real estate | 1963 |
| Landra Developments (West Worcester) Limited | Real estate | 2022 |
| Landra Developments Limited | Construction | 2023 |
| Landscape Enterprise Networks Organisation Limited | Administrative & support | 2023 |
| Lanesbury Limited | Financial services | 2012 |
| Langdale Enterprises Limited | Professional & scientific | 2026 |
| Langford Green Investments Ltd | Financial services | 2021 |
| Langford Inns Limited | Financial services | 2017 |
| Langston Life Limited | Real estate | 2024 |
| Lashlake Consultants Ltd | Professional & scientific | 2024 |
| Lastmiledrop Delivery Services UK Ltd | Transport & logistics | 2019 |
| Laurel Leaf Support Limited | Health & social care | 2013 |
| Lauren Garvey Fitness Ltd | Other services | 2024 |
| Laurieslocksandkeys Ltd | Manufacturing | 2023 |
| Lavelle Publications Limited | Information & communication | 1994 |
| Lawlor & Barre Limited | Arts & recreation | 2019 |
| Lawson-Smith Technology Services Ltd | Information & communication | 2017 |
| Layer X Layer Ltd | Professional & scientific | 2022 |
| LBN Holdings Ltd | Financial services | 2017 |
| LCC (North East) Limited | Information & communication | 2015 |
| LCC Communications Limited | Information & communication | 1997 |
| LD Builders (Witney) Limited | Construction | 2022 |
| LD Builders Investments Limited | Real estate | 2021 |
| LDN Acquisitions Ltd | Professional & scientific | 2024 |
| LDN SA Ltd | Hospitality | 2026 |
| LE Dogs Bollix Limited | Manufacturing | 2025 |
| Leada Properties Ltd | Financial services | 2021 |
| Leaders LAB UK Ltd | Professional & scientific | 2013 |
| LEADERSHIP2030S Ltd | Professional & scientific | 2023 |
| Leading Partners Limited | Information & communication | 2016 |
| Leafield Woodlands Limited | Agriculture & fishing | 1999 |
| Leda Associates Limited | Administrative & support | 2025 |
| Leena Cottage Limited | Financial services | 2026 |
| Leicester Stays Ltd | Real estate | 2020 |
| Leiker Group Limited | Extraterritorial | 2024 |
| Leiker Ltd | Manufacturing | 2019 |
| Lemos Carpentry Ltd | Construction | 2024 |
| Lemos Cleaning Services Ltd | Administrative & support | 2024 |
| Lental Limited | Information & communication | 2024 |
| Lesley Paterson & Associates Ltd | Professional & scientific | 2019 |
| Lets Talk Militaria UK Ltd | Wholesale & retail | 2025 |
| Leviathan Workshop Limited | Arts & recreation | 2013 |
| Lewis Court Management Company Limited | Real estate | 2019 |
| Lewis LEE Composite Solutions Ltd | Manufacturing | 2024 |
| Lewis Leslie Ltd | Construction | 2016 |
| Lewis Property Woodstock Ltd | Construction | 2003 |
| Lexicon Lifeline Ltd | Information & communication | 1998 |
| Lhdp Ltd | Health & social care | 2025 |
| LHW Consultancy Limited | Financial services | 2016 |
| LI Designs Limited | Other services | 2014 |
| Li's Home Limited | Real estate | 2022 |
| Liam Kenny Motor Body Repairs Limited | Manufacturing | 2000 |
| Life's Passsions Ltd. | Information & communication | 2012 |
| Lifts Direct Limited | Construction | 2020 |
| LIG Equity Ltd | Professional & scientific | 2024 |
| Liga (UK) Ltd | Administrative & support | 2011 |
| Light Property Development Ltd | Construction | 2025 |
| Light Space Consulting Ltd | Transport & logistics | 2014 |
| Lillsylen Ltd | Real estate | 2016 |
| Lily's Attic Limited | Wholesale & retail | 2009 |
| Lima Sierra Aviation Services LLP | | 2010 |
| Lime and Lintel Ltd | Construction | 2022 |
| LIMES25 Ltd | Construction | 2025 |
| Limoth Investments Ltd | Real estate | 2017 |
| Lincoln Education Limited | Extraterritorial | 2007 |
| Linear Composites Limited | Manufacturing | 1989 |
| Linear Plastering (Oxford) Ltd | Construction | 2018 |
| Linford Dynamic Engineering Ltd | Professional & scientific | 2013 |
| Link Juice Ltd | Manufacturing | 2022 |
| Linyard Ltd | Manufacturing | 2023 |
| Lion Box Ltd | Professional & scientific | 2013 |
| Lion Smile Limited | Hospitality | 2022 |
| Lionheart Group Limited | Construction | 2017 |
| Lions Head Estates Ltd | Hospitality | 2025 |
| Liora Care Group Ltd | Administrative & support | 2025 |
| Lisle Racing UK Limited | Arts & recreation | 2022 |
| Listening Partnership Ltd | Professional & scientific | 2012 |
| Little Bell Hospitality Ltd | Hospitality | 2019 |
| Little Dish Ltd | Hospitality | 2025 |