| Life I.T. Recruitment Limited | Administrative & support | 2005 |
| Liger Films Ltd | Information & communication | 2014 |
| Lighting and Interiors Limited | Wholesale & retail | 2016 |
| Lightning Plant and Construction Ltd | Construction | 2007 |
| Lights Window Cleaning Ltd | Administrative & support | 2026 |
| Liguria to London Ltd | Wholesale & retail | 2025 |
| Lilliana Helena Photography Limited | Professional & scientific | 2023 |
| Lily and Dinos Ltd | Wholesale & retail | 2014 |
| Lime Track Limited | Manufacturing | 2021 |
| Linfields Holt Limited | Professional & scientific | 2025 |
| Linkd Consultancy Services Ltd | Administrative & support | 2025 |
| Lion Moorings Twickenham Limited | Administrative & support | 2015 |
| Lion Works Limited | Extraterritorial | 2003 |
| Lion's Mane Theatre Arts Limited | Arts & recreation | 1994 |
| Lionique London Limited | Professional & scientific | 2012 |
| Lionique Visionary Labs Limited | Professional & scientific | 2025 |
| Liquiditv Ltd | Administrative & support | 2008 |
| Lisa Nails Limited | Other services | 2014 |
| Lisa Nails Salon Ltd | Other services | 2025 |
| Lite Loafers Ltd | Extraterritorial | 2013 |
| Little Kokoro Limited | Extraterritorial | 2015 |
| Little Mumbai Ltd | Hospitality | 2015 |
| Livano Ltd | Real estate | 2025 |
| Livepackets Limited | Information & communication | 2011 |
| Liveworkwell Ltd | Health & social care | 2011 |
| Livia's Collection Ltd | Administrative & support | 2018 |
| Livin Farms Ltd | Professional & scientific | 2015 |
| Livmar Limited | Wholesale & retail | 2020 |
| LIZ Barron Limited | Information & communication | 2003 |
| Lizard Brain Consultancy Limited | Administrative & support | 2016 |
| Ljjn Limited | Financial services | 2017 |
| LKJ Consulting Ltd | Professional & scientific | 2021 |
| LLA Group Ltd | Education | 2024 |
| Llareggub Limited | Professional & scientific | 2008 |
| Lllij Ltd | Hospitality | 2014 |
| LMA Operations Ltd | Professional & scientific | 2019 |
| LMB3 Solutions Ltd | Real estate | 2016 |
| LMB5 Solutions Limited | Professional & scientific | 2025 |
| LNA Maintenance Ltd | Construction | 2023 |
| LO and Behold! Productions Ltd | Professional & scientific | 2011 |
| Loanz Limited | Information & communication | 2022 |
| Local Convenient Store Ltd | Wholesale & retail | 2013 |
| Loch,Stock and Two Smoking Barrels Ltd | Manufacturing | 2021 |
| Lochie Ltd | Professional & scientific | 2023 |
| Locke Ventures Limited | Professional & scientific | 2025 |
| Loftairconditioning Ltd | Construction | 2024 |
| Logilink Ltd | Information & communication | 2025 |
| Logistical & Transport Solutions Limited | Transport & logistics | 2023 |
| Londark Ltd | Wholesale & retail | 2014 |
| Londis 97 (UK) Limited | Wholesale & retail | 2023 |
| London Building Development Limited | Construction | 2023 |
| London City Sevens Ltd | Administrative & support | 2025 |
| London Frightfest Limited | Information & communication | 2000 |
| London Global Hospitality Limited | Administrative & support | 2023 |
| London Hair Solution Ltd | Other services | 2025 |
| London Iconic Chauffeurs Limited | Other services | 2015 |
| London Leagues Limited | Arts & recreation | 2016 |
| London Music Service Ltd | Education | 2023 |
| London Sports Coaching & Mentoring Ltd | Arts & recreation | 2021 |
| London Steam Ltd | Professional & scientific | 2025 |
| London Wolf Estates Ltd | Real estate | 2014 |
| Longevity Quest Limited | Education | 2026 |
| Longfast Limited | Hospitality | 2001 |
| Longhoang Ltd | Professional & scientific | 2025 |
| Longterm Care Services Limited | Health & social care | 2012 |
| Lonmak Capital Advisory Ltd | Professional & scientific | 2017 |
| Loop Fitness Limited | Arts & recreation | 2022 |
| Lord & Chapman Global Solutions Ltd | Administrative & support | 2024 |
| Lordship Lane Developments Limited | Construction | 2019 |
| Lorenzo Fixer Ltd | Construction | 2017 |
| Lota Investments Ltd | Construction | 2025 |
| Louiscaz Ltd | Professional & scientific | 2024 |
| Louisville Projects Management Ltd | Real estate | 2017 |
| Louisville Property Management Limited | Real estate | 2007 |
| Love Dragonfly Limited | Professional & scientific | 2014 |
| Love Lawns Limited | Administrative & support | 2015 |
| Love Your Loaf Ltd | Hospitality | 2020 |
| Lowe Property Investments Ltd | Real estate | 2019 |
| Lrltd Ltd | Administrative & support | 2025 |
| Lshair Ltd | Other services | 2019 |
| LTG Limited | Administrative & support | 2006 |
| Ltlul Holdings Limited | Other services | 2025 |
| Luca Extension Ltd | Construction | 2017 |
| Lucent Resources Limited | Mining & quarrying | 2015 |
| Lucinanna Limited | Financial services | 2011 |
| Lucky HOUSE06 Ltd | Wholesale & retail | 2024 |
| Lucky Nail & Beauty Limited | Other services | 2019 |
| Lukas Building Constructions Limited | Construction | 2021 |
| Luke James Property Ltd | Professional & scientific | 2022 |
| Lulsgate Limited | Information & communication | 2000 |
| Lumalgen Ltd | Manufacturing | 2019 |
| Lumleys Flooring Ltd | Wholesale & retail | 2024 |
| Lunar Sugar Ltd | Wholesale & retail | 2026 |
| Lundon Properties Limited | Real estate | 2020 |
| LUV Energy Limited | Construction | 2020 |
| LUV Energy Partners Ltd | Construction | 2025 |
| LUX 36 Ltd | Manufacturing | 2024 |
| Luxe Flooring Solutions Ltd | Construction | 2025 |
| Luxlite Holdings Limited | Administrative & support | 2025 |
| Lvpool Home Ltd | Real estate | 2016 |