| LGM Industrial Roofing Limited | Construction | 2004 |
| LH Sensory Ltd | Wholesale & retail | 2022 |
| Lhfs Connect Limited | Professional & scientific | 2025 |
| Liam Kiely Limited | Manufacturing | 2023 |
| Lianne’S Beauty Limited | Other services | 2020 |
| Lidagroup Ltd | Wholesale & retail | 2023 |
| Life After OIL Stories Ltd | Information & communication | 2025 |
| Life Centred Business Ltd | Professional & scientific | 2023 |
| Lifesimple Ltd | Wholesale & retail | 2024 |
| Lightahome Limited | Wholesale & retail | 2026 |
| Lighthorne Consulting Ltd | Professional & scientific | 2024 |
| Lighting Assist Ltd | Professional & scientific | 2011 |
| LILLYMAE23 Limited | Transport & logistics | 2025 |
| Lily Stone Ltd | Professional & scientific | 2024 |
| Limes Services Limited | Administrative & support | 2017 |
| Limitless Property Group Limited | Real estate | 2026 |
| Limitless Works Limited | Construction | 2022 |
| Linden Luxe UK Ltd | Wholesale & retail | 2025 |
| Lindenbaum Investments Limited | Professional & scientific | 2013 |
| Link Leverage Limited | Professional & scientific | 2023 |
| Lion Heart Cards Ltd | Wholesale & retail | 2025 |
| Lion's Share (Holdings) Limited | Financial services | 2018 |
| Little Martins Management Company Limited | Households | 2019 |
| Little Nails & Spa Limited | Other services | 2025 |
| Little Seeds Music CIC | Information & communication | 2020 |
| Little Village Group Ltd | Real estate | 2021 |
| Littlebredy Properties Ltd | Real estate | 2024 |
| Littlemore Ltd | Information & communication | 2011 |
| Live Ears Ltd | Arts & recreation | 2026 |
| Live Event Bookings Limited | Administrative & support | 2024 |
| Live OUT Loud CIC | Education | 2026 |
| Live Wire Event Solutions Ltd | Professional & scientific | 2015 |
| Live Wire Productions Ltd | Professional & scientific | 2026 |
| Living Colour Tattoo Studio Limited | Other services | 2018 |
| LIZ Slynn Consultancy Services Ltd | Information & communication | 2024 |
| LKO Investments Limited | Real estate | 2024 |
| Lloyd Barrow Ltd | Hospitality | 2026 |
| Lloyd Warwick Limited | Financial services | 1993 |
| Lloyds Bank Commercial Finance Limited | Financial services | 1962 |
| LM Food and Wines Ltd | Wholesale & retail | 2023 |
| LM Landscapes Ltd | Administrative & support | 2024 |
| LMP Service Station Limited | Real estate | 1997 |
| LNC Winderton Limited | Administrative & support | 2023 |
| LNF Storage Limited | Hospitality | 2023 |
| LNT Mobilise Ltd | Wholesale & retail | 2025 |
| Loaded Foods Ltd | Hospitality | 2024 |
| Lockbund Foundry Ltd | Manufacturing | 2015 |
| Locs Station Ltd | Manufacturing | 2025 |
| Loft Group Limited | Financial services | 2015 |
| Logicom Hub Ltd | Transport & logistics | 2019 |
| Logisway Transport Ltd | Transport & logistics | 2024 |
| Loki PR Limited | Professional & scientific | 2018 |
| Lola Healthcare Services Limited | Health & social care | 2025 |
| Lola’S Cafe Ltd | Hospitality | 2021 |
| LON Holdings Limited | Financial services | 2022 |
| London Eyelashes Ltd | Wholesale & retail | 2020 |
| London Portfolio Limited | Real estate | 2024 |
| Londonbest Limited | Real estate | 2023 |
| Londonbest Management Ltd | Real estate | 2024 |
| Londonsdj.Uk Ltd | Information & communication | 2015 |
| Long Compton Garage Limited | Wholesale & retail | 2023 |
| Long Game Ventures Ltd | Wholesale & retail | 2026 |
| Longitude Productions Limited | Arts & recreation | 2023 |
| Longmoor Security Services Limited | Administrative & support | 2011 |
| Loop Homeware Ltd | Wholesale & retail | 2022 |
| Lordtommy Ltd | Health & social care | 2022 |
| Loss Prevention Council Limited | Information & communication | 2016 |
| Loudwater Group Limited | Real estate | 2018 |
| Louise Alison Aesthetics Ltd | Other services | 2024 |
| Love Donuts Ltd | Wholesale & retail | 2024 |
| Love HR Ltd | Administrative & support | 2023 |
| Love Jodie Ltd | Wholesale & retail | 2023 |
| Love Management Accounts Ltd | Professional & scientific | 2011 |
| Love the Web Limited | Information & communication | 2014 |
| Lovely Bubbly Dog Grooming Ltd | Other services | 2023 |
| Lovely Builders Limited | Construction | 2019 |
| Lovely Cleaning Ltd | Other services | 2015 |
| Loves Plumbing Ltd | Construction | 2024 |
| Lovesey Rural Services Limited | Other services | 2022 |
| Lovingmycake Ltd | Manufacturing | 2020 |
| Lowegistics Transport Ltd | Transport & logistics | 2020 |
| Lower Farm Willow Ltd | Agriculture & fishing | 2017 |
| Lower Grange Park Limited | Construction | 2025 |
| Loxton Holdings Limited | Wholesale & retail | 2016 |
| LS Engineering & Projects Ltd | Professional & scientific | 2025 |
| LSA UK Haulage Transport Ltd | Transport & logistics | 2026 |
| LSF Consultants Limited | Professional & scientific | 2010 |
| LTF Ltd | Real estate | 2015 |
| Lucabaro Limited | Transport & logistics | 2025 |
| Lucasent Ltd | Transport & logistics | 2025 |
| Lucidity Motorsport Ltd | Wholesale & retail | 2020 |
| Luii Limited | Professional & scientific | 2019 |
| Lukas Paint Ltd | Wholesale & retail | 2023 |
| Luke Evans Scaffolding Ltd | Construction | 2020 |
| Luksop Internet Services Ltd | Information & communication | 2018 |
| Lumeri Limited | Wholesale & retail | 2026 |
| Lumia Accounts Limited | Professional & scientific | 2014 |
| Luxton & Luxton Limited | Professional & scientific | 2006 |
| Luxury Saint Boutique Ltd | Administrative & support | 2017 |
| LV Cleaning Solutions UK Ltd | Wholesale & retail | 2024 |