| Kolt Services Ltd | Health & social care | 2026 |
| Komplexx Ltd | Information & communication | 2024 |
| Konfo Ltd | Wholesale & retail | 2006 |
| Korlyns Therapeutics Limited | Wholesale & retail | 2007 |
| Koyote Kars Ltd | Transport & logistics | 2024 |
| Kpings Limited | Health & social care | 2024 |
| KRN Home Ltd | Real estate | 2025 |
| KRS Associates Limited | Administrative & support | 2020 |
| KSP Urban Properties Ltd | Real estate | 2025 |
| KTR Cosmo Ltd | Information & communication | 2022 |
| Kubus Transport Services Limited | Transport & logistics | 2021 |
| Kudu Digital Limited | Information & communication | 2024 |
| Kylana Ltd | Real estate | 2020 |
| Kylee Group Ltd | Wholesale & retail | 2025 |
| Kymia C Ltd | Information & communication | 2020 |
| L and K Car Repairs Ltd | Wholesale & retail | 2022 |
| L Arnold Electrical Limited | Construction | 2016 |
| L J Paving Ltd | Administrative & support | 2010 |
| L Mulliyan Ltd | Hospitality | 2025 |
| L Plumbing & Heating Limited | Construction | 2017 |
| L&K Property Maintenance Limited | Administrative & support | 2013 |
| L&O Electrical Contractors Ltd | Construction | 2025 |
| LA KXN Ltd | Hospitality | 2025 |
| LA Maison DES Jouets Limited | Wholesale & retail | 2024 |
| Lactalis (UK) Limited | Wholesale & retail | 1981 |
| Lactalis Nestle Chilled Dairy Company Limited | Wholesale & retail | 2006 |
| Ladderlift Solutions Limited | Other services | 2022 |
| Laffey Handrails Limited | Construction | 2013 |
| Lakes Management Services Limited | Information & communication | 2024 |
| Lammas Motors Limited | Wholesale & retail | 1998 |
| Lancaster Court (Bromley) Management Co. Limited | Households | 1992 |
| Langhewood Ltd | Wholesale & retail | 2021 |
| Langley Motorist Discount Centre Limited | Administrative & support | 2007 |
| Langley Park Residents Management Company Limited | Households | 2004 |
| Langtron Limited | Wholesale & retail | 1985 |
| Lantern Lodge Hotels Ltd | Real estate | 2017 |
| Larkin Civil Engineering Ltd | Construction | 2016 |
| Larx Ltd | Wholesale & retail | 2023 |
| Lasa Blueprint Limited | Wholesale & retail | 2024 |
| Laser Star Technology Limited | Wholesale & retail | 2001 |
| Lasheen Consultants Limited | Information & communication | 2020 |
| Last Mile Link Technologies Limited | Professional & scientific | 2017 |
| Launch Recruitment Limited | Administrative & support | 2019 |
| Laura Clemson Limited | Wholesale & retail | 2014 |
| Laura Cockbain Ltd | Professional & scientific | 2024 |
| Lavish Luxe Limited | Wholesale & retail | 2019 |
| Lawrences Auctioneers Limited | Professional & scientific | 1998 |
| Lawrie Reilly Limited | Information & communication | 2022 |
| Lawson Brown Associates Limited | Professional & scientific | 2005 |
| LBA True Lash Ltd | Other services | 2019 |
| LBU Development Ltd | Construction | 2021 |
| LBU Group 1 Limited | Construction | 2021 |
| Lctv Holdings Limited | Financial services | 2019 |
| Lctv Limited | Other services | 2013 |
| LE Chateau Residents Company Limited | Households | 1969 |
| Learning Space | Education | 1997 |
| Leatherhead Motor Company Ltd | Extraterritorial | 2013 |
| Leba Consulting Limited | Professional & scientific | 2013 |
| Leepoc Ltd | Wholesale & retail | 2023 |
| Legends Soccer Group Ltd | Information & communication | 2023 |
| Leo's Chippy Ltd | Extraterritorial | 2019 |
| Leon Rosen Limited | Manufacturing | 2014 |
| Let's Pretend Limited | Arts & recreation | 2017 |
| Lettsom Advisors LLP | | 2008 |
| Lewis & White Estate Agents Limited | Real estate | 2010 |
| Lewis Marketing Limited | Real estate | 2012 |
| Lewis White Letting Agents Limited | Real estate | 2012 |
| LF Engineering Group Ltd | Financial services | 2026 |
| LGW Cars Ltd | Transport & logistics | 2024 |
| Liam Ayres Limited | Construction | 2012 |
| Liberty Grace Ltd | Administrative & support | 2025 |
| Libil Limited | Professional & scientific | 2023 |
| Lidex Control Systems Ltd | Construction | 2018 |
| Lifeline Beauty Ltd | Other services | 2018 |
| Light in the Cloud LLP | | 2009 |
| Lightning Fitness Ltd | Health & social care | 2019 |
| Lillecrapp and Pourik Investments Ltd | Financial services | 2019 |
| Liloss Business Ltd | Real estate | 2022 |
| Lily Digital LLP | | 2007 |
| Lily Digital Systems Limited | Professional & scientific | 2014 |
| LIM Accounting Limited | Professional & scientific | 2024 |
| Limejuice Designs Limited | Manufacturing | 2004 |
| Limpio Office Solutions Limited | Wholesale & retail | 2003 |
| Limpsfield Court Residents Association Limited | Households | 1993 |
| Linbeck Limited | Construction | 1962 |
| Lincoln House RTM Company Limited | Households | 2011 |
| Lindal Limited | Professional & scientific | 2024 |
| Lindsay Wilkinson Systems Limited | Construction | 2008 |
| Linkam Scientific Instruments Limited | Manufacturing | 1982 |
| Linnell (Parkwood) LLP | | 2005 |
| Linnell Volume LLP | | 2006 |
| Lion Building Maintenance Limited | Construction | 2023 |
| Lion Property Managment Ltd | Extraterritorial | 2024 |
| Lion Waste Ltd | Water & waste | 2025 |
| Lionel John Solutions Ltd | Information & communication | 2018 |
| Liskeard Lodge Management Company Limited | Households | 1990 |
| Little Moonlights Nursery & Preschool Ltd | Education | 2025 |
| Little Priory Limited | Real estate | 2023 |
| Little Thorns (Redhill) Management Company Limited | Households | 2023 |
| Little Vinnie’S Pizza Ltd | Hospitality | 2026 |