| Locumdoc Healthcare Ltd | Health & social care | 2023 |
| Lode Close Management Company Limited | Households | 2013 |
| Lodge House RTM Company Limited | Households | 2010 |
| Lodgehall Traders Ltd | Wholesale & retail | 2025 |
| Loft Sure Ltd | Construction | 2026 |
| Lofty Creations Apparel Limited | Manufacturing | 2023 |
| Logan & SON Scaffolding Limited | Construction | 2017 |
| Logbridge Construction Ltd | Construction | 2026 |
| Logic Autos Ltd | Wholesale & retail | 2023 |
| Logic Iconz Ltd | Construction | 2024 |
| Logical Branding Limited | Professional & scientific | 2025 |
| Logik Solutions Ltd | Information & communication | 2023 |
| Logu Limited | Wholesale & retail | 2023 |
| Logx Transport Express Ltd | Transport & logistics | 2025 |
| Loisteldor Limited | Health & social care | 2021 |
| Lokma Bakery Ltd | Hospitality | 2024 |
| Lolesworth Limited | Health & social care | 2022 |
| Lollipops Diner Ltd. | Hospitality | 2007 |
| London and Essex Hire Ltd | Administrative & support | 2016 |
| London Ceilings & Partitions Ltd | Construction | 2015 |
| London City Shopfitter Ltd | Construction | 2017 |
| London Colney Management Limited | Households | 1970 |
| London Decorating Specialists Limited | Construction | 2012 |
| London Elite Construction Limited | Construction | 2016 |
| London Food and Snack Limited | Wholesale & retail | 2014 |
| London Forktrucks Ltd | Construction | 2025 |
| London Integrated Forklift Trucks Limited | Manufacturing | 2006 |
| London Performance Centres Ltd | Arts & recreation | 2018 |
| London Pigmentation Clinic Ltd | Health & social care | 2022 |
| London Protection Security Ltd | Administrative & support | 2022 |
| London Road (Great Chesterford) Management Company Limited | Households | 2017 |
| London Road Apartments (Great Chesterford) Management Company Limited | Households | 2018 |
| London Road Chesterford Management Company Limited | Households | 2022 |
| London Sealant Services Limited | Construction | 2017 |
| London View Chambers Ltd | Professional & scientific | 2014 |
| London's Property Solutions Limited | Construction | 2019 |
| Long & MGS Trading Ltd | Wholesale & retail | 2016 |
| Longbarn Holdings Ltd | Financial services | 2020 |
| Longbolt Limited | Households | 1985 |
| Lonimi Properties Limited | Real estate | 2019 |
| Lorange Limited | Construction | 2021 |
| Lord Mansel Limited | Real estate | 2019 |
| Lordcave Developments Limited | Real estate | 1987 |
| Lordswood View Estate Management Company Limited | Households | 1994 |
| Lorrene Limited | Health & social care | 2025 |
| Lost Parrot Ltd | Administrative & support | 2021 |
| Lotus House CM20 Ltd | Hospitality | 2023 |
| Lou's Group Ltd | Wholesale & retail | 2023 |
| Loughton Scaffolding Merchants Limited | Construction | 2001 |
| Loughton Scaffolding Sales & Services Limited | Administrative & support | 2011 |
| Louie Spence Dance Ltd | Arts & recreation | 2018 |
| Louise Angeline Segui Ltd | Extraterritorial | 2022 |
| Louissurveys Ltd | Professional & scientific | 2024 |
| Love & Giggles Ltd | Wholesale & retail | 2025 |
| Love Grub Ltd | Hospitality | 2024 |
| Love IT Vegan Ltd | Other services | 2012 |
| Love&Jay Ltd | Construction | 2022 |
| Lovelystay Ltd | Hospitality | 2023 |
| Loveringite Limited | Information & communication | 2021 |
| Lowfield Construction Limited | Construction | 2013 |
| Lowland Limited | Administrative & support | 2003 |
| Lowler UK Limited | Administrative & support | 2021 |
| Loxford Ltd | Professional & scientific | 2021 |
| Loxford Trading Ltd | Administrative & support | 2018 |
| LP Carpentry & Maintenance Ltd | Construction | 2021 |
| LP James Property Ltd | Real estate | 2025 |
| LR Transportation (London) Limited | Transport & logistics | 2025 |
| LSG Associates Ltd. | Administrative & support | 2016 |
| LSL Real Estates Ltd | Real estate | 2025 |
| LSL Scaffolding Ltd | Construction | 2026 |
| LSR Services Limited | Administrative & support | 2017 |
| LSR23 Ltd | Administrative & support | 2023 |
| LT Foods Europe Holdings Limited | Agriculture & fishing | 2016 |
| LT Foods U.K. Limited | Agriculture & fishing | 2023 |
| LT9 Estates Limited | Real estate | 2020 |
| LTC Scaffolding Limited | Construction | 2007 |
| Ltibox Ltd | Other services | 2023 |
| Luawa Limited | Health & social care | 2016 |
| Luca Transport Services Ltd | Transport & logistics | 2018 |
| Lucifer's Labyrinth Ltd | Wholesale & retail | 2025 |
| Ludvika Solutions Ltd | Administrative & support | 2016 |
| Lukes Plumbing and Bathroom Services Ltd | Construction | 2026 |
| Lulu LUX Limited | Wholesale & retail | 2024 |
| Lumara Holdings Limited | Construction | 2025 |
| Lumilab Limited | Information & communication | 2026 |
| Lumina Lifestyle Ltd | Administrative & support | 2026 |
| Luminescence Holdings Ltd | Financial services | 2014 |
| Luminescence International Ltd | Manufacturing | 1999 |
| Lumino Distribution Ltd | Manufacturing | 2016 |
| Lumino Holdings Ltd | Financial services | 2015 |
| Luminopax Ltd | Health & social care | 2022 |
| Lumlu Ltd | Health & social care | 2020 |
| Lumode Limited | Health & social care | 2026 |
| Lunapearl Candles Limited | Wholesale & retail | 2022 |
| Lunellie Ltd | Wholesale & retail | 2024 |
| Lupa Medical Limited | Professional & scientific | 2012 |
| Lupin Crescent Residents Association Limited | Households | 1997 |
| Lupine Consulting Ltd | Information & communication | 2021 |
| Lushtressesuk Ltd | Wholesale & retail | 2020 |
| Lussivo Limited | Wholesale & retail | 2017 |