| Lifefiltered Ltd | Wholesale & retail | 2024 |
| Lifenet Solutions Limited | Information & communication | 2003 |
| Lifesage Ltd | Professional & scientific | 2021 |
| Lifescope Ltd | Health & social care | 2015 |
| Lifestyle Garden & Leisure Limited | Administrative & support | 2014 |
| Lifestyle Housing Norfolk Ltd | Real estate | 2021 |
| Lifetime Financial Solutions Limited | Financial services | 2003 |
| Lifetime Homes Limited | Extraterritorial | 2021 |
| Lifeworks Consultancy Limited | Professional & scientific | 2015 |
| Liftd Fitness Ltd | Health & social care | 2022 |
| Liftshare Ltd | Information & communication | 2014 |
| Liftshare.Com Limited | Extraterritorial | 2022 |
| Lifttech Inspection Services Ltd | Professional & scientific | 2023 |
| Light on Health Limited | Extraterritorial | 2006 |
| Lightbulb Search Ltd | Administrative & support | 2018 |
| Lightfoot Catering Ltd | Hospitality | 2014 |
| Lightgauge Ltd | Manufacturing | 2025 |
| Lighthouse Controls Ltd | Manufacturing | 2024 |
| Lighthouse Mediation Ltd | Financial services | 2022 |
| Lighthouse Properties (Norfolk) Limited | Real estate | 2021 |
| Lighting Technologies (UK) Limited | Construction | 2012 |
| Lightning Motorsport Ltd | Professional & scientific | 2024 |
| Lightning Storm Limited | Wholesale & retail | 2018 |
| Lightweight Containers UK Limited | Manufacturing | 2017 |
| Lightweight Future Ltd | Professional & scientific | 2022 |
| Lightwoods Green Ltd | Agriculture & fishing | 2017 |
| Lijoca Plumbing Ltd | Construction | 2025 |
| Lika Brothers Ltd | Construction | 2016 |
| Like That Ltd | Transport & logistics | 2023 |
| Like the Jacket Limited | Information & communication | 2021 |
| Liked Items UK Ltd | Information & communication | 2017 |
| Lilacs Studio Ltd | Professional & scientific | 2024 |
| Liles Ltd. | Professional & scientific | 1996 |
| Lili Grace Affordable Homes Limited | Construction | 2017 |
| Lili Olivia Holdings Ltd | Real estate | 2019 |
| Lilith Dental Ltd | Health & social care | 2024 |
| Lilley Property Holdings Limited | Real estate | 2025 |
| Lilley Sourcing Limited | Real estate | 2019 |
| Lillywhite Property Group Ltd | Construction | 2020 |
| Lilwalls HOG Roasts Limited | Agriculture & fishing | 2008 |
| Lily White Holiday LET Solutions Ltd | Real estate | 2023 |
| Lily White Property Solutions Ltd | Households | 2021 |
| Lily's Patient Transport Service Ltd | Transport & logistics | 2022 |
| Lilywhite Bear Ltd | Information & communication | 2015 |
| Lilywhites Carpentry & Building Services Ltd | Manufacturing | 2021 |
| Lima Healthcare & Medical Tech Equipment Limited | Health & social care | 2017 |
| Limar OIL Tools (UK) Limited | Mining & quarrying | 2009 |
| Limbaxis Systems Ltd | Professional & scientific | 2025 |
| Limbik Limited | Arts & recreation | 2011 |
| Lime Kiln Farm 2020 Ltd | Agriculture & fishing | 2020 |
| Lime Learning Ltd | Education | 2018 |
| Lime Light Ltd | Information & communication | 2026 |
| Lime Pharmacy Limited | Wholesale & retail | 2008 |
| Lime Software Ltd | Information & communication | 2013 |
| Lime Street Research Limited | Professional & scientific | 2013 |
| Lime Tree Avenue 108-118 RTM Company Limited | Real estate | 2012 |
| Lime Tree Court Residents Association (Norwich) Limited | Households | 1984 |
| Lime Tree Day Nurseries Ltd | Education | 2016 |
| Limecrete Products UK Ltd | Construction | 2020 |
| Limehouse Inns Limited | Hospitality | 2011 |
| Limelight Studios (Norwich) Ltd | Arts & recreation | 2013 |
| Limes Farm Reservoir Ltd | Water & waste | 2026 |
| Limitless Driving Tuition Limited | Education | 2025 |
| Limitless Gardens Limited | Construction | 2017 |
| Limitless Groundworks Ltd. | Construction | 2021 |
| Limitless Home Ltd | Wholesale & retail | 2017 |
| Limitless Landscapes Ltd | Administrative & support | 2018 |
| Limitless Landscaping Limited | Construction | 2016 |
| Limitless Renovations Norfolk Ltd | Construction | 2023 |
| LIN Medical Consultants Ltd | Health & social care | 2025 |
| Linburn Properties and Homes LLP | | 2017 |
| Lincoln Power Solutions Ltd | Construction | 2025 |
| Lincoln Street Properties Limited | Real estate | 2018 |
| Lincoln Transport Services Ltd | Transport & logistics | 2022 |
| Linder & Co Limited | Hospitality | 2025 |
| Lindley Court Residents Limited | Households | 1984 |
| Line Roster Ltd | Hospitality | 2026 |
| Line UP London Ltd | Other services | 2019 |
| Lines and SON Limited | Administrative & support | 2000 |
| Lines by Lottie Limited | Wholesale & retail | 2019 |
| Lingjing Group Ltd | Information & communication | 2022 |
| Linguani Ltd | Information & communication | 2012 |
| Linguistic Landscapes Limited | Professional & scientific | 2011 |
| Lingwood Chippy Limited | Hospitality | 2015 |
| Linico Ltd | Wholesale & retail | 2022 |
| LINIK69 Limited | Transport & logistics | 2025 |
| Link Construction Limited | Construction | 2007 |
| Link Medical Legal Ltd | Administrative & support | 2008 |
| Link Radio Services Limited | Information & communication | 2006 |
| Links Court (Sheringham) Limited | Real estate | 2003 |
| Linkz Enterprises Ltd | Information & communication | 2011 |
| Linlug Healthcare Limited | Health & social care | 2017 |
| Lins Barber Shop Ltd | Other services | 2025 |
| Lintsfast Limited | Real estate | 1961 |
| Linusoft Ltd | Information & communication | 2026 |
| Linzers Bakery Ltd | Manufacturing | 2023 |
| Linzers Limited | Administrative & support | 1984 |
| Lion & Castle Maintenance Limited | Construction | 2022 |
| Lion & Castle Property Management Limited | Real estate | 2019 |
| Lion & Castle Yard Management Company Limited | Households | 2018 |