| LAS Gidi Group Ltd | Hospitality | 2025 |
| Laser Perfection Limited | Other services | 2022 |
| Last Bros.Brickwork Ltd | Construction | 2007 |
| Last Level Games Limited | Wholesale & retail | 2018 |
| Last PUB Standing Limited | Hospitality | 2022 |
| Last Solutions Ltd | Information & communication | 2014 |
| Lastcall Inns Limited | Hospitality | 2022 |
| Lastingham Green Ltd | Real estate | 2023 |
| Latash UK Ltd | Wholesale & retail | 2026 |
| Latent Ltd | Professional & scientific | 2026 |
| Latentware Limited | Information & communication | 2012 |
| Lath Ltd | Wholesale & retail | 2025 |
| Lather Lads Ltd | Wholesale & retail | 2025 |
| Laugh in the Park Ltd | Arts & recreation | 2018 |
| Laughton Films Ltd | Information & communication | 2023 |
| Launceston House Residents Limited | Households | 2000 |
| Launceston Terrace Residents Association Limited | Administrative & support | 1976 |
| Laura Barwell Limited | Information & communication | 2017 |
| Laura Frances (Norfolk) Ltd | Other services | 2022 |
| Laura Iloniemi Ltd | Professional & scientific | 2020 |
| Laura KAY London Limited | Other services | 2016 |
| Laura Rutterford Physiotherapy Ltd | Health & social care | 2013 |
| Laura Vere Ltd | Wholesale & retail | 2014 |
| Lauran Moakes Ltd | Health & social care | 2024 |
| Laurel Court RTM Company Limited | Households | 2010 |
| Laurel Farm Management Company Ltd | Real estate | 2007 |
| Laurelwood Homes Limited | Professional & scientific | 2003 |
| Lauren Aston Ltd | Hospitality | 2019 |
| Lauren Doss Ltd | Arts & recreation | 2022 |
| Lauren Reeves Hair Ltd | Other services | 2014 |
| Lauren Rose Interior Design Limited | Professional & scientific | 2021 |
| Lauren's B & B Limited | Hospitality | 2025 |
| Laurence Elley Design Ltd | Professional & scientific | 2023 |
| Laurence Scott & Electromotors Limited | Manufacturing | 2007 |
| Laurie & Gowen Property Ventures Ltd | Construction | 2025 |
| Laurie & King Homes Limited | Construction | 2021 |
| Laurie Burrows Ltd | Professional & scientific | 2021 |
| Laus ET Salus Ltd | Real estate | 2026 |
| Lava Accountants Limited | Professional & scientific | 2016 |
| Laved Properties Limited | Financial services | 2021 |
| Lavish Surgery Limited | Health & social care | 2024 |
| Law Staff Legal Recruitment Ltd | Administrative & support | 2002 |
| Law Staff Legal Resources Limited | Administrative & support | 2007 |
| Lawler's Butchers Limited | Wholesale & retail | 2025 |
| Lawn N Order Limited | Professional & scientific | 2011 |
| Lawncraft Ltd | Extraterritorial | 2025 |
| Lawnelite Limited | Extraterritorial | 2025 |
| Lawrance GAS & Catering Installations Ltd | Construction | 2024 |
| Lawrence & Associates Limited | Professional & scientific | 2018 |
| Lawry Petroleum Geoscience Limited | Professional & scientific | 2014 |
| Laws & Taylor Holdings Ltd | Real estate | 2021 |
| Laws Dental Limited | Health & social care | 2024 |
| Layla ALI Ltd | Wholesale & retail | 2023 |
| Lazerthrust Ltd | Professional & scientific | 2008 |
| Lazuli Health Limited | Health & social care | 2023 |
| Lazy ALE Ltd | Hospitality | 2020 |
| Lazy Lobster Norwich Ltd | Wholesale & retail | 2024 |
| Lazyfpl Limited | Information & communication | 2021 |
| LB Coaching Ltd | Education | 2017 |
| LB Floor Screeds Ltd | Construction | 2025 |
| LB Power Solutions Ltd | Construction | 2023 |
| LB Solicitors Limited | Professional & scientific | 2023 |
| LBA Consultancy Services Ltd | Financial services | 2009 |
| Lbam Group Ltd | Financial services | 2022 |
| LBC Norwich Ltd | Wholesale & retail | 2022 |
| LBF Trade Limited | Wholesale & retail | 2006 |
| LBJ Properties Limited | Construction | 2019 |
| LBM Dental Therapy Ltd | Health & social care | 2009 |
| LBS Holdco Limited | Financial services | 2025 |
| LC Investments Limited | Financial services | 2014 |
| LC Quality Kitchens Ltd | Construction | 2025 |
| LC Wildlife Management Ltd | Administrative & support | 2017 |
| Lcif 2 Limited | Financial services | 2019 |
| Lcip 2007 LLP | | 2007 |
| Lcip 2009 LLP | | 2009 |
| Lcip 2010 LLP | | 2010 |
| Lcip 2011 LLP | | 2012 |
| Lcip 2012 LLP | | 2012 |
| LCJ Chiro Ltd | Health & social care | 2023 |
| LCN Spine LLP | | 2024 |
| Lcpf Property Limited | Real estate | 2024 |
| Lcuk Racing Ltd | Arts & recreation | 2014 |
| LCW Catering Ltd | Hospitality | 2018 |
| Lcwgroup Limited | Construction | 2020 |
| LD Autovogue Ltd | Wholesale & retail | 2016 |
| LD Capital Holdings Ltd | Financial services | 2022 |
| LDC Transport Ltd | Transport & logistics | 2014 |
| Ldca Catering Limited | Wholesale & retail | 2017 |
| Ldet Properties Ltd | Real estate | 2024 |
| LDH Distributions Ltd | Wholesale & retail | 2026 |
| LDH London Design House Co. Ltd | Professional & scientific | 2020 |
| LDM Home & Garden Services Limited | Construction | 2016 |
| LDO Real Estate Ltd | Real estate | 2024 |
| LDP Housing Ltd | Administrative & support | 2021 |
| LDP Motor Trades Ltd | Wholesale & retail | 2022 |
| Ldsc Properties Ltd | Real estate | 2026 |
| Ldtv Media Ltd | Information & communication | 2026 |
| LE Grice Future Plants Limited | Agriculture & fishing | 1995 |
| LE Luxor Ltd | Wholesale & retail | 2025 |
| LE MAN Cave Limited | Arts & recreation | 2026 |