| Lightbeam X Community Interest Company | Education | 2024 |
| Lilac Financial Limited | Financial services | 2020 |
| Lilac Nest Ltd | Real estate | 2026 |
| Lilian Services Ltd | Wholesale & retail | 2017 |
| Lime Corby Limited | Hospitality | 2026 |
| Lime Mews (Peterborough) Management Company Limited | Real estate | 2018 |
| Limo Prime Ltd | Wholesale & retail | 2026 |
| Lindell Associates Limited | Professional & scientific | 2018 |
| Lindsay Hearn Consultancy Limited | Professional & scientific | 2011 |
| Line-Mark(.Com) Limited | Other services | 2021 |
| Linewater Limited | Real estate | 2006 |
| Linsu Body Shop Ltd | Wholesale & retail | 2016 |
| Linwood Community Co-Operative Ltd | Health & social care | 2003 |
| Lion GTR Ltd | Wholesale & retail | 2018 |
| Lion Tyres Ltd | Wholesale & retail | 2021 |
| Little Acorns Corby Ltd | Health & social care | 2017 |
| Little Britain Opco Limited | Real estate | 2012 |
| Little Family Limited | Real estate | 2023 |
| Little Foxes Group Limited | Health & social care | 2024 |
| Little Geniuses Childcare Ltd | Other services | 2024 |
| Little House Accountants Limited | Professional & scientific | 2023 |
| Little Learners Childcare LLP | | 2009 |
| Little Spring Ltd | Wholesale & retail | 2008 |
| Little Stanion Farm Management Company Limited | Real estate | 2007 |
| Little Stanion Residents Association Ltd | Administrative & support | 2026 |
| Live Laugh Limited | Hospitality | 2024 |
| Live N Care Limited | Health & social care | 2014 |
| Livewheatgrass Limited | Manufacturing | 2009 |
| Living Faith International Ministries Ltd | Other services | 2010 |
| Living Meadows Gardening Ltd | Construction | 2026 |
| Livis Ltd | Construction | 2025 |
| Liza Props Ltd | Real estate | 2024 |
| Lizhar Ltd | Other services | 2025 |
| LJ Star Trans Ltd | Wholesale & retail | 2026 |
| LJR Property Invest Ltd | Real estate | 2021 |
| LK Driver Limited | Transport & logistics | 2018 |
| LK Renovation Ltd | Construction | 2020 |
| LL Johnson Properties Limited | Real estate | 2015 |
| Ll&Jl Limited | Health & social care | 2022 |
| Llkm Management Services Limited | Real estate | 2025 |
| Lloyd Court Management Limited | Professional & scientific | 1990 |
| LM Academy Limited | Arts & recreation | 2021 |
| LM Easy Solutions Ltd | Administrative & support | 2025 |
| LM GAS Ltd | Construction | 2018 |
| LM Ignite Ltd | Construction | 2025 |
| LMC Alloys Prep Ltd | Wholesale & retail | 2025 |
| LMP Smart Repairs Limited | Wholesale & retail | 2015 |
| LND Gifts Ltd | Wholesale & retail | 2018 |
| Lobcar Limited | Wholesale & retail | 2017 |
| Local London (Quay House) Limited | Real estate | 2017 |
| Locket & Sugar Ltd | Manufacturing | 2025 |
| Lodge Taverns Limited | Hospitality | 2008 |
| Logi-Temp Limited | Professional & scientific | 2013 |
| Logic Pro Solutions Ltd | Professional & scientific | 2023 |
| Logistics Investments Limited | Extraterritorial | 2001 |
| Loki Qfix Ltd | Wholesale & retail | 2024 |
| London Academy of Cryptology Limited | Education | 2018 |
| London Ibmc Ltd | Professional & scientific | 2025 |
| LONDON104 Ltd | Real estate | 2025 |
| Longbrook Land (Geddington) Ltd | Construction | 2026 |
| Longbrook Land Limited | Construction | 2026 |
| Longbrook Logs Limited | Wholesale & retail | 2022 |
| Looe Pharmacy Limited | Wholesale & retail | 2023 |
| Looped Consulting Ltd | Professional & scientific | 2021 |
| Loopresale Ltd | Wholesale & retail | 2026 |
| Lord’S Driving Limited | Education | 2025 |
| Loryma (UK) Limited | Manufacturing | 2001 |
| Lotus & Oak Limited | Health & social care | 2026 |
| Lotus Fusion Limited | Health & social care | 2024 |
| LOU Co Properties Ltd | Real estate | 2021 |
| Lourds Recovery Limited | Transport & logistics | 2026 |
| Lovan Ltd | Financial services | 2023 |
| Love ALL Health Care Limited | Health & social care | 2014 |
| Love Corby C.I.C. | Administrative & support | 2021 |
| Love Outreach Network | Other services | 2024 |
| Lowde Events Ltd | Arts & recreation | 2023 |
| Lowde Logistics Ltd | Transport & logistics | 2016 |
| Lowson Homes Ltd | Real estate | 2021 |
| Lswe Ltd | Professional & scientific | 2015 |
| LTM Plumbing and Heating Limited | Construction | 2024 |
| LTN Social Care Services Ltd | Health & social care | 2015 |
| Lubron Advanced Oils Ltd. | Manufacturing | 1997 |
| LUC Selfdriving Ltd | Transport & logistics | 2018 |
| Lucas Private Dining Ltd | Hospitality | 2026 |
| Lucian First Construct Ltd | Construction | 2026 |
| Lucianailsart Ltd | Other services | 2024 |
| Lucy 901 Art Ltd | Arts & recreation | 2025 |
| Luddington Estate Limited | Professional & scientific | 2009 |
| Ludicious Games Limited | Extraterritorial | 2024 |
| Lufrost Ltd | Other services | 2026 |
| LUG Ltd | Construction | 2018 |
| Lukalex Ltd | Transport & logistics | 2018 |
| Lumine Group Ltd | Real estate | 2025 |
| Lunar Phoenix Ltd | Real estate | 2026 |
| Lune Trans Limited | Transport & logistics | 2014 |
| Lunette Private Trustees Company Limited | Other services | 2023 |
| Lunette Services One Limited | Administrative & support | 2015 |
| Lunette Services Three Limited | Extraterritorial | 2016 |
| Lunette Services Two Limited | Administrative & support | 2015 |
| Lunixo Limited | Wholesale & retail | 2024 |