| Lift & Skate Limited | Manufacturing | 2016 |
| Lift FIX Ltd | Professional & scientific | 2018 |
| Lift Maintenance Solutions Ltd | Manufacturing | 2025 |
| Lighthouse Beets Ltd | Real estate | 2023 |
| LIGHTS4YOU Limited | Wholesale & retail | 2008 |
| Lilac Group Ltd | Hospitality | 2023 |
| Lilly & TED Transport Ltd | Transport & logistics | 2018 |
| Lily Green Limited | Administrative & support | 2012 |
| Lily Ofield Beauty Therapy Limited | Other services | 2025 |
| Lime Web Development (Chorley) Limited | Information & communication | 2014 |
| Limesbridge Property Company Limited | Real estate | 1983 |
| Limezest Media Limited | Professional & scientific | 2019 |
| Limitless Adventuring C.I.C. | Arts & recreation | 2020 |
| Limitless Thinking Limited | Education | 2022 |
| Link Impact Services CIC | Professional & scientific | 2021 |
| Link-Ability | Health & social care | 1989 |
| Linton Northcote Limited | Financial services | 2024 |
| Lion Labels & Packaging Limited | Wholesale & retail | 2021 |
| Lion Systems (NW) Limited | Administrative & support | 2009 |
| Lion's Mane Consulting Limited | Administrative & support | 2012 |
| Lion’S Mane Solutions Limited | Administrative & support | 2012 |
| Lisa Nabou Limited | Professional & scientific | 2017 |
| Listening Tree Bereavement Support CIC | Health & social care | 2015 |
| Listening Tree Group Ltd | Health & social care | 2024 |
| Listo Burrito Bars Limited | Extraterritorial | 2012 |
| Listo Burrito Limited | Hospitality | 2012 |
| Listo Mexican Limited | Hospitality | 2016 |
| Little Angels Daycare Thornton-Cleveleys Limited | Health & social care | 2021 |
| Little Cove Play Cafe Limited | Hospitality | 2026 |
| Little Devils (Doncaster) Limited | Wholesale & retail | 2005 |
| Little Explorers Nursery LLP | | 2012 |
| Little G'S Pre-School Limited | Education | 2012 |
| Little Harbour Farm Developments Ltd | Construction | 2024 |
| Little Harbour Farm Equestrian Ltd | Agriculture & fishing | 2022 |
| Little Harbour Farm Holdings Ltd | Administrative & support | 2024 |
| Little Harbour Farm Ltd | Agriculture & fishing | 2020 |
| Little Lions Coaching Clinic Ltd | Education | 2018 |
| Little NUT Tree Ltd | Wholesale & retail | 2020 |
| Little Zameen Company Limited | Professional & scientific | 2024 |
| Live Health and Fitness Gold Ltd | Arts & recreation | 2023 |
| Live Health and Fitness Ltd | Arts & recreation | 2019 |
| Live Installations Ltd | Construction | 2025 |
| Live Life Homes Limited | Other services | 2012 |
| Live Pearl PLC | Construction | 2025 |
| Lived X Futures Limited | Education | 2025 |
| Liver Drives Patterned Imprinted Concrete Limited | Construction | 2022 |
| Liverpool Honey Company Ltd | Agriculture & fishing | 2024 |
| Livery Street Partners Limited | Extraterritorial | 2019 |
| Living Landscapes (GS) Ltd | Administrative & support | 2025 |
| LIVINGFIT0 Ltd | Arts & recreation | 2023 |
| LJ Transport Driver Services Ltd | Transport & logistics | 2022 |
| LK. Engineering Limited | Manufacturing | 2015 |
| Lkgp Investments Limited | Real estate | 2024 |
| LKP Limited | Hospitality | 2017 |
| LL Plumbing & Heating Services Ltd | Construction | 2024 |
| LL Sportswear Ltd | Wholesale & retail | 2026 |
| Llanelli Trade Ltd | Wholesale & retail | 2017 |
| Llelle Limited | Real estate | 2021 |
| Lloyd O'Sullivan Financial Services Limited | Administrative & support | 2015 |
| Lloyds Care Group Ltd | Health & social care | 2017 |
| LM Landscapes and Groundworks Ltd | Construction | 2024 |
| LM Plumbing Services Ltd | Construction | 2019 |
| LMA Hospitality Ltd | Hospitality | 2025 |
| LMC Languages Ltd | Public administration | 2025 |
| LME Service & Repair Ltd | Construction | 2009 |
| LMF Property Investments Ltd | Real estate | 2025 |
| LMP Architects Ltd | Professional & scientific | 2005 |
| LNB Properties Limited | Real estate | 2021 |
| Lo-Crbn Ltd | Professional & scientific | 2022 |
| Local Independent Energy Limited | Professional & scientific | 2007 |
| Locate Capital Limited | Real estate | 2017 |
| Loch Lomond Apartments Limited | Real estate | 2025 |
| Loch Lomond House Limited | Real estate | 2025 |
| Loch Lomond Studio Limited | Real estate | 2025 |
| Locke Capital Management (L.C.M) Ltd | Real estate | 2025 |
| Lockfit North Derbyshire Ltd | Other services | 2022 |
| Lockie Social Work Solutions Ltd | Health & social care | 2024 |
| Lockmill Construction Ltd | Construction | 2021 |
| Lockswood Ltd | Construction | 2013 |
| Locomotive Engineering Services Ltd | Professional & scientific | 2022 |
| Lodge Luxury Ltd | Transport & logistics | 2023 |
| Lodge Road MOT Limited | Wholesale & retail | 2024 |
| Loft Canterbury Limited | Hospitality | 2019 |
| Loft Conversions South Wales Ltd | Construction | 2021 |
| Logic First Ltd | Transport & logistics | 2018 |
| Logical Traction Limited | Transport & logistics | 2015 |
| Logik Apam (Baring Street) Ltd | Real estate | 2011 |
| Logik BTR Limited | Construction | 2023 |
| Logik Developments Limited | Construction | 2009 |
| Logik FGR Limited | Real estate | 2020 |
| Logik Strategic Land Limited | Construction | 2017 |
| Logik WTE Limited | Construction | 2017 |
| Logsmith Data Services Ltd | Information & communication | 2025 |
| Logwood Dressage Limited | Arts & recreation | 2020 |
| Logwood International Limited | Wholesale & retail | 2023 |
| Lois and G Services Limited | Construction | 2014 |
| Lomax Services Limited | Administrative & support | 2023 |
| London International Tutors Limited | Education | 2010 |
| Long DUO DUO Limited | Hospitality | 2024 |
| Longcar Leisure Limited | Hospitality | 2024 |