| Lovett Hair Ltd | Other services | 2021 |
| Lovewell Blake Financial Planning (Great Yarmouth) Limited | Financial services | 2004 |
| Lovewell Blake Financial Planning Limited | Financial services | 1998 |
| Lovisa Boutique Limited | Wholesale & retail | 2023 |
| Lovora Ltd | Wholesale & retail | 2024 |
| LOW Carbon Data Services Limited | Information & communication | 2016 |
| LOW Carbon Generation and Trading Limited | Energy | 2011 |
| LOW Carbon Innovation Fund Limited | Professional & scientific | 2009 |
| LOW Cost Windscreens Limited | Wholesale & retail | 2021 |
| LOW Farm Kennels Ltd | Other services | 2019 |
| Lowell Norwich Ltd | Wholesale & retail | 2021 |
| Lower Goat Barbers Limited | Other services | 2016 |
| Lower Marine Parade Ltd | Real estate | 2013 |
| Lower Spinks Lane Limited | Construction | 2023 |
| Lowerfield Energy Centre Limited | Energy | 2022 |
| Lowestoft MGT Ltd | Other services | 2003 |
| Lowlands Group Limited | Financial services | 2024 |
| Loxam Limited | Administrative & support | 2022 |
| Loxwood 1974 Limited | Information & communication | 2014 |
| Loyal Pharmacy Limited | Wholesale & retail | 2011 |
| Loyal Taxis (Norwich) Limited | Transport & logistics | 2008 |
| Loyly-Sauna UK Ltd | Manufacturing | 2025 |
| Loze IT Services Ltd | Information & communication | 2018 |
| LP Tax Advisory Ltd | Professional & scientific | 2024 |
| LPA Developments Limited | Real estate | 2017 |
| LPB Plastering Limited | Construction | 2008 |
| LPJ Associates Limited | Other services | 2002 |
| LPM Electrical Solutions Ltd | Construction | 2021 |
| LR Medical Aesthetics and Wellness Ltd | Professional & scientific | 2026 |
| LRP Automotive Ltd | Wholesale & retail | 2016 |
| LRT Engineering Ltd | Professional & scientific | 2019 |
| LRW Lead Specialist Ltd | Construction | 2021 |
| LS Automotive Ltd | Wholesale & retail | 2019 |
| LS Car Valeting Ltd | Administrative & support | 2025 |
| LS Engineering Services Limited | Manufacturing | 2007 |
| LS Holdings Company Limited | Real estate | 2016 |
| LS Switchgear Limited | Manufacturing | 2021 |
| LS93 MS Limited | Administrative & support | 2021 |
| LSA Trading Ltd | Other services | 2019 |
| LSB Web Design Ltd | Information & communication | 2014 |
| LSI Architects (Design) Limited | Professional & scientific | 2014 |
| LSI Architects (International) Limited | Professional & scientific | 2012 |
| LSI Architects (UK) Limited | Professional & scientific | 2011 |
| LSI Architects LLP | | 2002 |
| LSI Design Holdings 2 Limited | Financial services | 2024 |
| LSI Design Holdings Limited | Financial services | 2019 |
| LSI UK Holdings 2 Limited | Financial services | 2024 |
| LSI UK Holdings Limited | Financial services | 2019 |
| LSP Housing Ltd | Real estate | 2025 |
| LT Fleet Services Ltd | Professional & scientific | 2026 |
| LTN Hospitality Ltd | Hospitality | 2025 |
| LTN Property Ltd | Real estate | 2026 |
| LU Property Ltd | Real estate | 2022 |
| Lubyleez Ltd | Manufacturing | 2025 |
| Lubysil Limited | Transport & logistics | 2017 |
| Luca Sorcoiu Ltd | Wholesale & retail | 2026 |
| Lucaciu Limited | Health & social care | 2016 |
| Lucciano’S GRP Ltd | Manufacturing | 2023 |
| Luckett Removals Limited | Transport & logistics | 2011 |
| Lucky 15 Ltd | Arts & recreation | 2019 |
| Lucky 3 Holdings Limited | Wholesale & retail | 2026 |
| Lucky Lantern Drinks and Bar Ltd | Hospitality | 2025 |
| Lucky Lotus Meals Limited | Hospitality | 2025 |
| Lucky Mountain Games Limited | Information & communication | 2008 |
| Lucky Norwich Limited | Hospitality | 2025 |
| Lucky Spice Ltd | Hospitality | 2018 |
| Lucraft Ltd | Wholesale & retail | 2018 |
| Lucrum Developments Ltd | Construction | 2025 |
| Lucy Brock Equine Limited | Financial services | 2021 |
| Lucy's Chips Norwich Limited | Hospitality | 2016 |
| Lucy's Fish & Chips Ltd | Hospitality | 2022 |
| Lucylovesbylucy Ltd | Wholesale & retail | 2022 |
| Ludgate Consultancy & Training Limited | Professional & scientific | 2004 |
| Ludham Carpets (Norfolk) Limited | Construction | 2025 |
| Ludham Construction and Design Limited | Construction | 2017 |
| Ludham Marine (Holdings) Limited | Transport & logistics | 1967 |
| Ludicrous Entertainment Ltd | Information & communication | 2019 |
| Luis Neto Hair Design Ltd | Other services | 2019 |
| Luke Cossey Holdings Ltd | Financial services | 2025 |
| Luke Matthews Physique Consultant Limited | Other services | 2016 |
| Luke Mingaye Plumbing & Heating Ltd | Construction | 2021 |
| Luke Robinson Prestige Ltd | Wholesale & retail | 2021 |
| Luke Wilson Photography and Media Ltd | Professional & scientific | 2024 |
| Lula Holdings Ltd | Other services | 2022 |
| Lullaby Inc Limited | Hospitality | 2006 |
| Luma Project Consulting Limited | Professional & scientific | 2017 |
| Luma Van Cartier Limited | Health & social care | 2015 |
| Lumelensmedia Ltd | Information & communication | 2024 |
| Lumen Support Ltd | Education | 2023 |
| Lumen Technical Advisory Limited | Professional & scientific | 2025 |
| Lumiere Lofts Ltd | Construction | 2020 |
| Lumina Wellness Ltd | Health & social care | 2026 |
| Luminant Ltd | Construction | 2026 |
| Luminator UK Ltd | Transport & logistics | 2025 |
| Luminous Care Group Limited | Health & social care | 2022 |
| Luminous Communications Ltd | Professional & scientific | 2013 |
| Luminous Domiciliary Care Ltd | Health & social care | 2022 |
| Luminous Recruitment Ltd | Administrative & support | 2020 |
| Lumisol Ltd | Construction | 2023 |
| Luna Bean Ltd | Wholesale & retail | 2025 |