| Kraken Party Limited | Information & communication | 2020 |
| Kraken Submission Grappling Ltd | Education | 2023 |
| Krishna ELY Ltd | Hospitality | 2023 |
| Kriya Consultancy Ltd | Professional & scientific | 2012 |
| Kroqon Ltd | Hospitality | 2026 |
| KSH UK Holdings Limited | Real estate | 2024 |
| KTW Property Specialists Ltd | Real estate | 2025 |
| KW Enterprises Ltd | Wholesale & retail | 2025 |
| Kween BEE Cleaning Limited | Administrative & support | 2022 |
| L a Developments Ltd | Real estate | 2021 |
| L Burch Consultancy Ltd | Professional & scientific | 2026 |
| L Burch Holdings Ltd | Financial services | 2026 |
| L J Brooks Transport Ltd | Transport & logistics | 2026 |
| L J Technical Consultancy Ltd | Agriculture & fishing | 2012 |
| L P Scaffolding Limited | Construction | 2005 |
| L Saunders Developments Limited | Administrative & support | 2017 |
| L. a. D. S. Construction Limited | Construction | 2017 |
| L.W.Luxury Worktops Ltd | Manufacturing | 2024 |
| LA Fashions Limited | Wholesale & retail | 2010 |
| LA Strega Ltd | Wholesale & retail | 2021 |
| Labib Group Ltd | Wholesale & retail | 2020 |
| Labour-Tech Holdings Limited | Real estate | 2011 |
| LABS2LISTINGS Limited | Professional & scientific | 2024 |
| Labyrinth Designs Ltd | Professional & scientific | 2015 |
| Ladida (UK) Baby Toys Company Limited | Wholesale & retail | 2014 |
| Lady Boutique Littleport Ltd | Wholesale & retail | 2023 |
| Lalev Transport Ltd | Transport & logistics | 2024 |
| LAM Food & Fibre Limited | Agriculture & fishing | 2021 |
| Lancaster Apex Limited | Hospitality | 2026 |
| Lancaster Lodge Childcare Ltd | Health & social care | 2012 |
| Lanes Farm Energy Limited | Other services | 2016 |
| Langley Asset Group Limited | Financial services | 2026 |
| Langwell Holdings Limited | Financial services | 2022 |
| Lapwing Aviation Limited | Transport & logistics | 2012 |
| Larbey & Co Event Management Ltd | Professional & scientific | 2025 |
| LAUNCH360 Ltd | Administrative & support | 2017 |
| Laureate Precision Engineering Limited | Other services | 2016 |
| Lavery Smith Properties Limited | Real estate | 2022 |
| Lawnosity Ltd | Agriculture & fishing | 2024 |
| Layn Developments Limited | Construction | 2021 |
| Layn Group Holdings Limited | Administrative & support | 2022 |
| Layn Residential Property Investment Limited | Construction | 2022 |
| Layn Self-Storage Limited | Other services | 2022 |
| Layron Consultancy Limited | Information & communication | 2011 |
| LB Jettech Ltd | Wholesale & retail | 2020 |
| LBOND89 Limited | Health & social care | 2021 |
| LDK Cleaning Service Limited | Administrative & support | 2022 |
| Lead Limitless Ltd | Professional & scientific | 2024 |
| Leadership Academy Group Ltd | Education | 2023 |
| LEAF39 Ltd | Professional & scientific | 2019 |
| Leamon Court Residents Association Limited | Real estate | 1988 |
| LEASOTEL24 Limited | Real estate | 2024 |
| LEE and Sons (Littleport) Limited | Real estate | 1977 |
| LEE Green Glazing Contractors Limited | Construction | 1994 |
| Leechmere Farm Limited | Real estate | 2015 |
| Leeyah Luxe Beauty Limited | Wholesale & retail | 2026 |
| Legal Products Group Limited | Administrative & support | 2008 |
| Lenava Limited | Education | 2021 |
| Lenka Travels Limited | Administrative & support | 2024 |
| Leonine Bookkeeping Services Limited | Professional & scientific | 2025 |
| LET Alone Ltd | Hospitality | 2023 |
| Lets Execute Ltd | Administrative & support | 2024 |
| Lewis Murfet Cleaning Services Limited | Administrative & support | 2017 |
| Lexmas Ltd | Professional & scientific | 2018 |
| Libby Saunders & Sons Park Homes Limited | Administrative & support | 2010 |
| Life Fitness (UK) Limited | Wholesale & retail | 1992 |
| Lifter VS Lifter Ltd | Arts & recreation | 2025 |
| Lillemor Limited | Information & communication | 2003 |
| Lilley Wood Management Company Limited | Households | 2017 |
| Limerent Films Ltd | Information & communication | 2025 |
| Limitless Academy CIC | Education | 2026 |
| Link Direct Services (UK) Limited | Construction | 2026 |
| Link Food Solutions Ltd | Wholesale & retail | 2023 |
| Lion Building Works Limited | Construction | 2019 |
| Lion Learners Educational Experiences Limited | Education | 2012 |
| Lisa Wiles Property Ltd | Real estate | 2023 |
| Lite-Trac Systems Limited | Financial services | 2015 |
| Little Chapels Limited | Construction | 2019 |
| Little Dog Ltd | Information & communication | 2017 |
| Little Downham Horse Trials Ltd | Arts & recreation | 2011 |
| Little GEM Cars Limited | Transport & logistics | 2018 |
| Little Luxuries Beauty Ltd | Other services | 2026 |
| Little Oaks Residential Care Limited | Health & social care | 2020 |
| Little Peacocks Sensory Ltd | Education | 2025 |
| Little Thetford Acorns | Education | 2009 |
| Little Wombatz Limited | Education | 2012 |
| Littleport Cutz Ltd | Other services | 2026 |
| Littleport Fish N Chips Ltd | Hospitality | 2019 |
| Littleport Leisure | Arts & recreation | 2012 |
| Littleport Management Limited | Households | 2017 |
| Littleport Mushroom Farms (2011) Limited | Agriculture & fishing | 2012 |
| Littleport Mushroom Farms LLP | | 2012 |
| Littleport Nails Ltd | Other services | 2024 |
| Littleport Station Cafe Ltd | Hospitality | 2023 |
| Litwin Limited | Agriculture & fishing | 2014 |
| Lizhutchison Limited | Health & social care | 2024 |
| LJM Accounting Ltd | Professional & scientific | 2013 |
| LJW Insulation Ltd | Construction | 2023 |
| Llam Developments Ltd | Construction | 2022 |
| Lloyds Garage Fordham Ltd | Wholesale & retail | 2015 |