| Legend Stay Ltd | Construction | 2025 |
| Lemon &Thyme Catering Limited | Extraterritorial | 2016 |
| Leslie Consulting Services Ltd | Professional & scientific | 2016 |
| Lester's Manufacturing Limited | Manufacturing | 1981 |
| LET Correct UK Ltd | Real estate | 2022 |
| LET INS Ltd | Real estate | 2012 |
| LET PAL Ltd | Real estate | 2022 |
| Let's GET Away! Ltd | Administrative & support | 2016 |
| Letterbox Homes Limited | Real estate | 2018 |
| LEV Consult Ltd | Professional & scientific | 2023 |
| Levare Limited | Information & communication | 2023 |
| Levvis Ltd | Transport & logistics | 2021 |
| Lewis Engineering Ltd | Professional & scientific | 2023 |
| Lewis Property Solutions Limited | Construction | 2025 |
| Lewis's Football FUN Ltd | Arts & recreation | 2025 |
| Leyfields Limited | Agriculture & fishing | 2004 |
| LH Lettings Limited | Real estate | 2013 |
| LHG Events Ltd | Arts & recreation | 2011 |
| LHG Productions Ltd | Information & communication | 1998 |
| Libertas Health & Safety Ltd | Professional & scientific | 2020 |
| Liberty (Contractors) Ltd | Construction | 2006 |
| Liberty Holdings (Claypole) Ltd | Financial services | 2019 |
| Liberty Sports Limited | Construction | 2015 |
| Libz Property Ltd | Real estate | 2024 |
| Lifeline Support Centres CIC | Health & social care | 2026 |
| Lifespring Centre | Extraterritorial | 2009 |
| Lifting the Weight Ltd | Other services | 2024 |
| Light Dynamix Ltd | Professional & scientific | 2022 |
| Lighthouse Accountancy & Business Solutions Ltd | Professional & scientific | 2018 |
| Lighting Analysts Limited | Information & communication | 2008 |
| Lightmap Limited | Information & communication | 2009 |
| Like the Garden Productions Ltd | Information & communication | 2025 |
| Lilac Recycling UK Limited | Wholesale & retail | 2014 |
| Lilley Construction Services Ltd | Construction | 2018 |
| Lilley Electrical Limited | Construction | 2016 |
| Lils Art and Fashion Ltd | Wholesale & retail | 2026 |
| Lime Contract Packing Ltd | Transport & logistics | 2015 |
| Lime Tree Close Residents Association Limited | Real estate | 1995 |
| Lime Tree Collection Ltd | Administrative & support | 2017 |
| Lime Tree Design Limited | Administrative & support | 2018 |
| Limelight Media Graphics Limited | Administrative & support | 2014 |
| Limelight MGR Ltd | Administrative & support | 2026 |
| Limitless Garden Rooms Ltd | Construction | 2023 |
| Limitless Prize Draw Ltd | Wholesale & retail | 2026 |
| Limitless Research Ltd | Professional & scientific | 2021 |
| Lina Barber Ltd | Other services | 2024 |
| Lince Driver Ltd | Transport & logistics | 2019 |
| Lincoln Garage Door Repairs Limited | Manufacturing | 2021 |
| Lincoln Glass & Glazing Ltd | Construction | 2020 |
| Lincoln Glass Group Limited | Professional & scientific | 2000 |
| Lincolnshire Carrot Supplies Limited | Wholesale & retail | 2004 |
| Linden Management (UK) Limited | Professional & scientific | 1995 |
| Lindrick Business Services Limited | Real estate | 1986 |
| Lindrick Conference Centre LLP | | 2009 |
| Linford IT Services Limited | Information & communication | 2016 |
| Link Media Supplies Limited | Wholesale & retail | 2004 |
| Link Tyre Sales Limited | Wholesale & retail | 1981 |
| Lionheart Living Limited | Administrative & support | 2022 |
| Listgreen Limited | Real estate | 1981 |
| Little Allamoor Investments Limited | Real estate | 2023 |
| Little Bale Co Limited | Agriculture & fishing | 2025 |
| Little Carlton Lodge Limited | Arts & recreation | 2019 |
| Little Cottage Loves Ltd | Wholesale & retail | 2021 |
| Little Saigon Ltd | Other services | 2026 |
| Live Entertainment Global Ltd | Arts & recreation | 2025 |
| Living Redefined 2 Ltd | Real estate | 2022 |
| Living Waters Europe | Other services | 2013 |
| LIZ Hobbs Group Limited | Arts & recreation | 2000 |
| Lizzie Baugh Eventing Ltd | Arts & recreation | 2025 |
| LJ General Builders Limited | Construction | 2006 |
| LJB Homes Limited | Real estate | 2020 |
| LJI Holdings Ltd | Real estate | 2021 |
| LK Roofing Ltd | Construction | 2023 |
| Lkay Properties Ltd | Real estate | 2015 |
| LLM Comms Limited | Information & communication | 2025 |
| Llwnr Ltd | Professional & scientific | 2021 |
| LM Motors Group Ltd | Wholesale & retail | 2022 |
| Lmkg Properties Ltd | Hospitality | 2025 |
| LN1 Management Limited | Administrative & support | 2018 |
| LN1 Properties Ltd | Real estate | 2023 |
| Lodge Barns Ltd | Real estate | 2024 |
| London Road Aesthetics Ltd | Health & social care | 2022 |
| Longboat Group Holdings Limited | Financial services | 2026 |
| Longboat Special Education Ltd. | Education | 2017 |
| Longbutts Lane Management Company Limited | Real estate | 1999 |
| Longship Ltd | Financial services | 2008 |
| LOO 4 a DO Limited | Administrative & support | 2005 |
| Loopwheels Limited | Manufacturing | 2006 |
| Lost Boys Inc Ltd | Wholesale & retail | 2015 |
| LOTELIS01 Limited | Administrative & support | 2021 |
| Lotus Sun Property Ltd | Real estate | 2022 |
| Louth Trade Park Management Company Limited | Households | 2020 |
| Lowen & Lighthouse Ltd | Professional & scientific | 2026 |
| Lowtown Limited | Administrative & support | 2019 |
| Loxbridge Limited | Administrative & support | 2018 |
| Loxbridge Plus Care Ltd | Administrative & support | 2023 |
| Loxdale Land Developments Limited | Real estate | 2001 |
| LR Western Horsemanship Ltd | Agriculture & fishing | 2024 |
| LRB Estates Limited | Real estate | 2014 |
| LSN Restorations Limited | Construction | 2025 |