| London and Essex CBT Limited | Health & social care | 2009 |
| London and Essex Kidney Clinic Ltd | Health & social care | 2016 |
| London Bailiffs Limited | Professional & scientific | 2010 |
| London BBL Limited | Other services | 2023 |
| London Building Repairs Limited | Construction | 2018 |
| London Business Support Solutions Limited | Administrative & support | 2025 |
| London Chemical Industries Limited | Professional & scientific | 2000 |
| London Essex Shutters Ltd | Wholesale & retail | 2023 |
| London Executive Travel Services Limited | Transport & logistics | 2017 |
| London Finance Brokers Ltd | Financial services | 2017 |
| London Fire Consultants and Design Associates Limited | Administrative & support | 2002 |
| London Garden Services Ltd | Extraterritorial | 2008 |
| London Gateway Networks Limited | Information & communication | 2010 |
| London Green Roofs & Slabbing Ltd | Construction | 2023 |
| London Hospitality Consulting Ltd | Professional & scientific | 2014 |
| London Iron Limited | Construction | 2008 |
| London Lifting Ltd | Financial services | 2026 |
| London Medical Design Limited | Health & social care | 2008 |
| London Medical Health Limited | Health & social care | 2017 |
| London Prefab Ltd | Manufacturing | 2016 |
| London Professional Headshots Ltd | Professional & scientific | 2018 |
| London Psychotherapy Practice Ltd | Health & social care | 2021 |
| London Upper Limb Unit Limited | Health & social care | 2010 |
| London View Developments Ltd | Professional & scientific | 1998 |
| London Wado RYU Karate Ltd | Arts & recreation | 2020 |
| London Watch Group Limited | Wholesale & retail | 2017 |
| Long & LEE Limited | Real estate | 2007 |
| Long Live King Ltd | Information & communication | 2017 |
| Longbow BB Ltd | Wholesale & retail | 2017 |
| Longco Limited | Construction | 2015 |
| Longdon Investments Ltd | Financial services | 2014 |
| Longfeld Investment Company (Shenfield) Limited | Real estate | 2024 |
| Longfeld Investment Company Limited | Construction | 1959 |
| Longmead Estate Ltd | Real estate | 2025 |
| Longwine Services Limited | Construction | 2012 |
| Lons Electrical Services Limited | Construction | 2022 |
| Look Alive Limited | Hospitality | 2017 |
| Loop Streaming and Productions Ltd | Arts & recreation | 2006 |
| Loopylou Watford Ltd | Hospitality | 2026 |
| Lorex LLP | | 2021 |
| Lorienvale Estates Limited | Information & communication | 2025 |
| Lorne Lofts Ltd | Construction | 2018 |
| Lorraines School of Dancing Ltd | Education | 2022 |
| LOT Companies Limited | Hospitality | 2024 |
| Louisa Seymour Podiatry Ltd | Health & social care | 2014 |
| Louise Sinclair Designs Limited | Manufacturing | 2023 |
| Loupen Basildon Ltd | Information & communication | 2026 |
| Love Pink Lily.Com Ltd | Professional & scientific | 2010 |
| Love Welfare Services Ltd | Water & waste | 2025 |
| Lovebites Dating Ltd | Other services | 2023 |
| Loved to Go Ltd | Wholesale & retail | 2021 |
| Lovelock and Taylour Limited | Construction | 1970 |
| Lovleigh Ltd | Real estate | 2026 |
| LOW Farm (Lincoln) Ltd | Agriculture & fishing | 2022 |
| Lowco Company Limited | Wholesale & retail | 1988 |
| Lowman AL Ltd | Administrative & support | 2023 |
| LP & R Ltd | Construction | 2022 |
| LPM Core Consultancy Ltd | Public administration | 2024 |
| LR Capital Finance Limited | Financial services | 2006 |
| LR Capital Properties Limited | Real estate | 2001 |
| LR Lifting Solutions Limited | Professional & scientific | 2017 |
| LRD Developments Ltd | Real estate | 2014 |
| LS (Essex) Limited | Construction | 2020 |
| LSJ Financial Consultants Ltd | Financial services | 2013 |
| LSM Investments Limited | Real estate | 1994 |
| LSN Alloys Ltd | Wholesale & retail | 2021 |
| Lucking Limited | Financial services | 2026 |
| Lucking Utility Services Limited | Construction | 2017 |
| Lucky 13 TV Ltd | Arts & recreation | 2022 |
| Lucky and Money Co. Limited | Real estate | 2021 |
| Lucky Focus Ltd | Hospitality | 2019 |
| Lucky Grab Ltd | Information & communication | 2019 |
| Luckzac Ltd | Professional & scientific | 2025 |
| Lucy Meehan Events Ltd | Other services | 2019 |
| Lucy Olivia Limited | Arts & recreation | 2014 |
| Lucy Sharp Ltd | Administrative & support | 2013 |
| Luftkuss Ltd | Other services | 2021 |
| Luggie Limited | Wholesale & retail | 2024 |
| Luke Stone Consulting Ltd | Professional & scientific | 2025 |
| Lulu Incorporation Limited | Professional & scientific | 2012 |
| Lumieramed Ltd | Education | 2025 |
| Lumiglow Group Ltd | Other services | 2025 |
| Luminae Homes Ltd | Real estate | 2026 |
| Luminco UK Limited | Professional & scientific | 2024 |
| Luminease Limited | Information & communication | 2007 |
| Luminous Consulting Limited | Administrative & support | 2003 |
| Lumoto Consultancy Limited | Professional & scientific | 2022 |
| Lunest Group of Companies Ltd | Wholesale & retail | 2024 |
| Luniloops Limited | Wholesale & retail | 2025 |
| Lurue Counselling and Coaching Ltd | Health & social care | 2016 |
| Lutafo Consulting Limited | Information & communication | 2016 |
| Lutafo Homes Limited | Construction | 2026 |
| Lutafo Limited | Wholesale & retail | 2016 |
| Lutafo Ventures Limited | Real estate | 2020 |
| LUX Homes Brentwood Limited | Real estate | 2021 |
| Luxury Charter & Hire LLP | | 2024 |
| Luxury PRE Owned Limited | Wholesale & retail | 2022 |
| Luxury Property Services Limited | Real estate | 2000 |
| Luxxuris Ltd | Administrative & support | 2023 |
| Lycheekoko Ltd | Hospitality | 2025 |