| Langport Properties Limited | Administrative & support | 2009 |
| Langteng Trading Limited | Wholesale & retail | 2024 |
| Langtonskin Ltd | Wholesale & retail | 2023 |
| Language Excel Ltd | Professional & scientific | 2020 |
| Language School Ltd | Education | 2024 |
| Langwith Peri Peri Chicken Ltd | Hospitality | 2024 |
| Lanh's Nail Salon Limited | Other services | 2014 |
| Lanky Cowboy Ltd | Transport & logistics | 2015 |
| Lannigan Contracts Limited | Construction | 2017 |
| Lannon Ltd | Wholesale & retail | 2019 |
| Lansdowne Lofts Limited | Real estate | 2019 |
| Lantem Consulting Limited | Professional & scientific | 2011 |
| Lanzon Design Ltd | Professional & scientific | 2020 |
| Laplink Europe Limited | Information & communication | 2005 |
| Lardner Aviation Services Limited | Manufacturing | 2012 |
| Larem Autos Ltd | Wholesale & retail | 2013 |
| Lark Descaling Tools (UK) Limited | Manufacturing | 2001 |
| Larkin Knife & Tool Limited | Manufacturing | 2018 |
| Larkswood (Aspley Guise) Management Company Limited | Real estate | 2016 |
| Larkwise Ltd. | Wholesale & retail | 2010 |
| Larmrose Limited | Administrative & support | 1993 |
| Larry’S Construction and Valeting Group Limited | Construction | 2025 |
| Laruss Ltd | Construction | 2022 |
| Lasani Foods Limited | Hospitality | 2025 |
| Lascom Limited | Professional & scientific | 2003 |
| Lasega Ltd | Arts & recreation | 2017 |
| Laser by Rajni Limited | Other services | 2018 |
| Lasercraft Ltd | Manufacturing | 2015 |
| Lash Extensions & Microblading Milton Keynes Ltd | Other services | 2018 |
| Lasheruss Production Ltd | Administrative & support | 2023 |
| Last Gasp Productions Limited | Information & communication | 2010 |
| Last Minute Wonders Ltd | Information & communication | 2024 |
| Last Stop Lettings Ltd | Real estate | 2026 |
| Lasting Wishes Ltd | Professional & scientific | 2023 |
| Latin-Link Distribution & Services Ltd | Wholesale & retail | 2010 |
| Latralis Ltd | Health & social care | 2010 |
| Latrena Ltd | Real estate | 2024 |
| Laur Maria Motors Ltd | Wholesale & retail | 2026 |
| Laura Boardman Consulting Limited | Professional & scientific | 2024 |
| Laura Emily Limited | Financial services | 2015 |
| Laura Francis Farm Consultants Ltd | Agriculture & fishing | 2019 |
| Laura Thomas Counselling Limited | Professional & scientific | 2023 |
| Laurels Business Services Ltd | Professional & scientific | 2023 |
| Laurenkate Limited | Manufacturing | 2004 |
| Laurentiu Ltd | Transport & logistics | 2011 |
| Laurentiu-Paulaner Ltd | Transport & logistics | 2025 |
| Laurentiuflory Limited | Administrative & support | 2015 |
| Lavanda Media Ltd | Information & communication | 2024 |
| Laveau Ltd | Professional & scientific | 2011 |
| Lavelle Rail Services Ltd | Construction | 2012 |
| Lavender House Residential Home Limited | Health & social care | 2004 |
| Lavish Loos by Emma Ltd | Wholesale & retail | 2024 |
| Lavishka Technologies UK Ltd | Information & communication | 2016 |
| Law Gravity Ltd | Information & communication | 2017 |
| Lawayaka Ltd | Arts & recreation | 2015 |
| Lawbrook Finance Limited | Administrative & support | 2014 |
| Lawford Property Estates Ltd | Real estate | 2023 |
| Lawmag Services Ltd | Health & social care | 2021 |
| Lawn Farm Management Company Ltd | Administrative & support | 2021 |
| Lawn Science Limited | Other services | 2006 |
| Lawnrite Limited | Administrative & support | 2015 |
| Lawrence & Co Accountants Ltd | Professional & scientific | 2019 |
| Lawrence Academy Ltd | Administrative & support | 2015 |
| Lawrence Home Services Ltd | Professional & scientific | 2025 |
| Lawview Properties Solution Limited | Real estate | 2025 |
| Lawyers Point Solicitors Limited | Professional & scientific | 2017 |
| Laxman Transport Services Ltd | Transport & logistics | 2020 |
| Laxmii Enterprise Ltd | Wholesale & retail | 2021 |
| Laxton's Publishing Limited | Information & communication | 2011 |
| Layaly Zaman Ltd | Hospitality | 2020 |
| Layer One Projects Limited | Energy | 2010 |
| LAYER6PRODUCTION Ltd | Professional & scientific | 2021 |
| Layerbound Limited | Information & communication | 2025 |
| Lazarus Datarecovery Ltd | Information & communication | 2015 |
| Lazeez MK Limited | Hospitality | 2026 |
| Lazu LLP | | 2010 |
| Lazy Larks Publishing LLP | | 2023 |
| LB Flooring Solutions Ltd | Construction | 2018 |
| LB Kitchen Appliances Limited | Manufacturing | 2024 |
| Lbass Ltd | Other services | 2020 |
| LBB - Luxe Beauty Bar Ltd | Other services | 2025 |
| LBC Green Logistics Limited | Transport & logistics | 2024 |
| Lbeau Clinique Limited | Other services | 2019 |
| LBR Demolition Services Limited | Construction | 2015 |
| Lbs-Mk Group Ltd | Hospitality | 2020 |
| LBT Investments | Financial services | 2025 |
| LC Signs Limited | Manufacturing | 2007 |
| LCF Palaceway Ltd | Hospitality | 2023 |
| Lcha Limited | Information & communication | 2020 |
| LCI 1102 Ltd | Real estate | 2014 |
| LCI 1103 Ltd | Real estate | 2014 |
| LCI 1302 Ltd | Real estate | 2014 |
| LCI 1303 Ltd | Real estate | 2014 |
| LCI 1402 Ltd | Real estate | 2014 |
| LCI 1403 Ltd | Real estate | 2014 |
| LCI 1702 Ltd | Real estate | 2014 |
| LCI 1703 Ltd | Real estate | 2014 |
| LCJ Recruitment Specialists Ltd | Administrative & support | 2016 |
| LCM Electrical Ltd | Construction | 2016 |
| Lcmg Construction Ltd | Construction | 2024 |