| L J I Investments Ltd | Wholesale & retail | 2016 |
| L O'Reilly Carpentry & Joinery Ltd | Manufacturing | 2019 |
| L R C Homes Limited | Real estate | 2016 |
| L W Refurbishments Ltd | Wholesale & retail | 2025 |
| L.G.Harris & Co.Limited | Manufacturing | 1930 |
| L.Poole Electrical Services Ltd | Construction | 2025 |
| L1 Risk Management Limited | Extraterritorial | 2025 |
| LA Luna Productions Limited | Arts & recreation | 2021 |
| LAB One Films Limited | Information & communication | 2022 |
| Label Innovations (Holdings) Limited | Professional & scientific | 2000 |
| LAI Services Limited | Administrative & support | 2023 |
| Lammas Park Advertising Limited | Information & communication | 2021 |
| Lammas Park Limited | Information & communication | 2014 |
| Landmark Landscaping Ltd | Administrative & support | 2018 |
| Landons Limited | Wholesale & retail | 2016 |
| Lanesway Limited | Real estate | 2002 |
| Langdale Property Consultancy Limited | Extraterritorial | 2026 |
| Lansalot Limited | Information & communication | 2006 |
| Lapcad Limited | Information & communication | 1999 |
| Larja Resolutions Ltd | Administrative & support | 2026 |
| Lark Management Group Limited | Arts & recreation | 2020 |
| Larkgrove Limited | Other services | 1997 |
| Larkswood (Dudley) Management Company Limited | Households | 2006 |
| Laser ID Ltd | Manufacturing | 2026 |
| Latin-Smith Properties Ltd | Real estate | 2024 |
| Latitude 38 Limited | Professional & scientific | 2009 |
| Latymer Associates Limited | Professional & scientific | 1985 |
| Launchory Limited | Wholesale & retail | 2025 |
| Laundry Clothing Ltd | Wholesale & retail | 2018 |
| Laura Caun Copywriting Ltd | Professional & scientific | 2018 |
| Laura Fitzgerald Photography Ltd | Professional & scientific | 2025 |
| Laura Goodwin Limited | Financial services | 2017 |
| Laurel Yanny Limited | Information & communication | 2025 |
| Laurent Wealth Management Limited | Other services | 2017 |
| Lavender Honey BEE Limited | Hospitality | 2024 |
| Lawcost Legal Limited | Professional & scientific | 2020 |
| Laximark Digital Ltd | Wholesale & retail | 2025 |
| Layton Property LLC Ltd | Real estate | 2023 |
| Lazarus Care Group Ltd. | Health & social care | 2018 |
| LBC Properties Limited | Real estate | 1997 |
| Lcuk Richmond Ltd | Other services | 2021 |
| LEA Catering Ltd | Hospitality | 2023 |
| Leadstate Ltd | Manufacturing | 2025 |
| Leafnova Limited | Wholesale & retail | 2025 |
| Leanne Daly Consulting Ltd | Professional & scientific | 2026 |
| Leap and Jump Ltd | Administrative & support | 2023 |
| Learnative Limited | Professional & scientific | 2012 |
| Learning From Toys Ltd | Wholesale & retail | 2020 |
| Leaton Hall Limited | Households | 2000 |
| Leaving Care Solutions Limited | Health & social care | 2009 |
| Left Overs Limited | Wholesale & retail | 1997 |
| Legacy Martial Arts LLP | | 2023 |
| Legends Gents Limited | Other services | 2018 |
| Leicester HIP & Knee Limited | Health & social care | 2018 |
| Leisure Group (Midlands) Ltd | Real estate | 2017 |
| Leixlip Holdings Limited | Financial services | 2017 |
| Lemari Ltd | Real estate | 2023 |
| Lendline (NW) Ltd | Real estate | 2004 |
| Leotha Health Care Ltd | Health & social care | 2025 |
| LES Howard & SON Limited | Construction | 2009 |
| Lesley Ashworth Accessories Limited | Wholesale & retail | 2010 |
| Lesters Car Body Repairs Limited | Wholesale & retail | 2016 |
| Let's Play- Penn Ltd | Education | 2024 |
| Lets Drive T M Ltd | Education | 2020 |
| Letty Properties Ltd | Real estate | 2024 |
| Lewis & Beddows Limited | Construction | 1980 |
| LFS & Partners Limited | Financial services | 2002 |
| LGE Investments Limited | Real estate | 2024 |
| Liam Harrison Solutions Ltd | Administrative & support | 2024 |
| Liberty Construction Limited | Construction | 1992 |
| Liberty Holdings Unlimited | Real estate | 1997 |
| Lickey Hills Café Ltd | Hospitality | 2025 |
| Lickey Hills Garage Limited | Wholesale & retail | 2008 |
| Lickey Secretaries | | 1987 |
| Lidex Trading Ltd | Financial services | 2015 |
| Life Style Luxgram PVT Ltd | Wholesale & retail | 2025 |
| Lifestyles UK Limited | Manufacturing | 1997 |
| Lifting Site Solutions Limited | Administrative & support | 2026 |
| Light Puppet Productions Limited | Arts & recreation | 2020 |
| Light Spider Ltd | Professional & scientific | 2026 |
| Lime Financial Services Ltd | Financial services | 2008 |
| Lime Marketing Communications and Productions Limited | Professional & scientific | 2008 |
| Lime Soda Consultancy Ltd | Construction | 2018 |
| Lincs House Limited | Construction | 2014 |
| Line Makers Club Ltd | Administrative & support | 2025 |
| Linemannvsr Limited | Manufacturing | 2006 |
| Lineview Holdings Limited | Financial services | 2022 |
| Lineview Solutions Limited | Information & communication | 2009 |
| Linisc Limited | Information & communication | 2018 |
| Link Property Developments Limited | Construction | 1999 |
| Linthurst Properties Limited | Real estate | 2012 |
| Lion & Lamb Management Company Limited | Households | 2023 |
| Lionheart Traders Limited | Wholesale & retail | 2026 |
| Lisa Jacobs Ltd | Wholesale & retail | 2008 |
| Lister Asset Company Limited | Real estate | 2024 |
| Lithify Limited | Information & communication | 2018 |
| Little Acre Ltd | Professional & scientific | 2016 |
| Little Babbit Limited | Arts & recreation | 2021 |
| Little Dog Publishing Limited | Arts & recreation | 2020 |
| Little Feet - the Learning World Ltd | Education | 2024 |