| London Slts Ltd | Administrative & support | 2009 |
| London Studio Group Ltd | Real estate | 2021 |
| London Sussex Ltd | Professional & scientific | 2019 |
| London Tigers Security Services Ltd | Administrative & support | 2016 |
| London Toptrade Ltd | Wholesale & retail | 2017 |
| London Trading One Ltd. | Administrative & support | 2011 |
| Londonedge Consulting Ltd | Professional & scientific | 2024 |
| Londons Farm and Plant Ltd | Professional & scientific | 2023 |
| Londra Culturale Limited | Administrative & support | 2020 |
| Lone Wolf Lead GEN Ltd | Professional & scientific | 2026 |
| Lonely Sunday Ltd | Wholesale & retail | 2023 |
| Long & Marshall Limited | Manufacturing | 1977 |
| Long Dog Samplers Limited | Professional & scientific | 2018 |
| Long Four Acres Management Company Limited | Households | 2022 |
| Long Lane Enterprises Ltd | Wholesale & retail | 2022 |
| Long Lane Pool Ltd | Arts & recreation | 2026 |
| Long MEN Limited | Extraterritorial | 2014 |
| Long Road Management Company Limited | Households | 2018 |
| Long Stratton (Maple Park) Management Company Ltd | Real estate | 2018 |
| Long Stratton Dental and Implant Centre Ltd | Health & social care | 2022 |
| Long Stratton Euro Shop Limited | Wholesale & retail | 2025 |
| Long Stratton Splash Ltd | Administrative & support | 2024 |
| Longbow Capital LLP | | 2004 |
| Longbow General Partner Limited | Financial services | 2006 |
| Longcarrow Limited | Administrative & support | 2021 |
| Longday Foods Limited | Wholesale & retail | 1983 |
| Longe & Co Limited | Professional & scientific | 2018 |
| Longshore Kingsparade Ltd | Professional & scientific | 2023 |
| Longwater (Gravel) Company Limited(The) | Mining & quarrying | 1952 |
| Longwater (Properties) Limited | Real estate | 1996 |
| Longwater (South East) Limited | Wholesale & retail | 2016 |
| Longwater Business Park Limited | Professional & scientific | 1996 |
| Longwater Construction Supplies (Sleaford) Ltd | Wholesale & retail | 2009 |
| Longwater Construction Supplies Limited | Wholesale & retail | 2008 |
| Longwater Flooring Ltd | Construction | 2019 |
| Longwater Limited | Financial services | 2016 |
| Lonsdale Developments Ltd | Construction | 2020 |
| Lonsdale House (Norwich) Limited | Households | 1998 |
| Lontsie Ltd | Health & social care | 2024 |
| Look Holdings Ltd | Extraterritorial | 2022 |
| Look Residential Limited | Professional & scientific | 2006 |
| Look Who's Walking Ltd | Extraterritorial | 2011 |
| Looka Trading and Sourcing Ltd | Wholesale & retail | 2025 |
| Looking After Your Pennies Ltd | Information & communication | 2021 |
| Loom Mart Ltd | Construction | 2025 |
| Loopd Software Ltd | Information & communication | 2022 |
| Loose's Limited | Real estate | 1926 |
| Lootbox Ltd | Manufacturing | 2022 |
| LOP Ventures Ltd | Hospitality | 2009 |
| Lopez Healthcare Ltd | Health & social care | 2019 |
| Lord Holiday Holdings Ltd | Hospitality | 2022 |
| Lord Nelson Burnham Ltd | Wholesale & retail | 2018 |
| Loredan Trans Limited | Transport & logistics | 2013 |
| Lorel Marketing Ltd | Professional & scientific | 2026 |
| Loren Property Limited | Real estate | 2019 |
| Lorton Securities Ltd | Administrative & support | 2007 |
| Lostbricks Ltd | Wholesale & retail | 2018 |
| LOT133 Ltd | Professional & scientific | 2018 |
| Lotic Limited | Financial services | 2022 |
| Lotion Spray Limited | Wholesale & retail | 2014 |
| Lots Auctions Ltd | Wholesale & retail | 2008 |
| Lotus Cars Limited | Manufacturing | 1967 |
| Lotus Engineering Limited | Professional & scientific | 1980 |
| Lotus Group International Limited | Other services | 1993 |
| Lotus House 2018 Ltd | Hospitality | 2018 |
| Lotus Motorsport Limited | Professional & scientific | 1987 |
| Lotus Pension Trustees Limited | Financial services | 2000 |
| Lotus Solutions International Ltd | Administrative & support | 2020 |
| LOU Maud Limited | Real estate | 2024 |
| Louch Electrical Anglia Limited | Construction | 2023 |
| Loudon & Loudon Ltd | Wholesale & retail | 2019 |
| Loudwater Trading Ltd | Financial services | 2025 |
| Louemro Limited | Health & social care | 2019 |
| Louie Blake Limited | Professional & scientific | 2018 |
| Louies Court Management Limited | Households | 1990 |
| Louise Coates Design Ltd | Professional & scientific | 2022 |
| Louise Grinsdale Ltd | Professional & scientific | 2014 |
| Louise Haddock Holdings Ltd | Real estate | 2021 |
| Louise Marie Accountancy Limited | Professional & scientific | 2024 |
| Louise Young Cosmetics Ltd | Administrative & support | 2010 |
| Lounge 2026 Ltd | Hospitality | 2026 |
| Lourimar Limited | Wholesale & retail | 1986 |
| Louth Road Development Limited | Construction | 2016 |
| Lova Ltd | Administrative & support | 2016 |
| Love Amélie Ltd | Manufacturing | 2024 |
| Love Glamping Ltd | Hospitality | 2017 |
| Love LXA Ltd | Manufacturing | 2025 |
| Love My Property Ltd | Real estate | 2019 |
| Love Renovating Limited | Real estate | 2022 |
| Love Rita Limited | Manufacturing | 2023 |
| Love to Care Home Care Norfolk Ltd | Health & social care | 2023 |
| Love to Dress Ltd | Wholesale & retail | 2022 |
| Love Your Salad Limited | Hospitality | 2017 |
| Loveaylsham Ltd | Construction | 2019 |
| Loveday Capital Limited | Financial services | 2010 |
| Loveday Nutrition Ltd | Professional & scientific | 2022 |
| Lovely Button UPS Limited | Wholesale & retail | 2022 |
| Lovely Days Ltd | Hospitality | 2025 |
| Lovely Letts Limited | Real estate | 2021 |
| Lovespell Ltd | Other services | 2024 |