| Laser 99 Ltd | Other services | 2025 |
| Laser Components (UK) Limited | Wholesale & retail | 1993 |
| Lashes & Beauty Ltd | Other services | 2018 |
| Last Journey Ltd | Transport & logistics | 2025 |
| Last Light LLP | | 2017 |
| Lastarte Trans MAX Ltd | Administrative & support | 2018 |
| Late Knights Ltd | Arts & recreation | 2026 |
| Lateck Holdings Limited | Financial services | 2025 |
| Latinaromas Ltd | Manufacturing | 2023 |
| Latitude Life Limited | Administrative & support | 2020 |
| Latvia Store Ltd | Wholesale & retail | 2020 |
| Launch Imports Limited | Wholesale & retail | 2025 |
| Launching 2U Ltd | Administrative & support | 2023 |
| Laura Transport Ltd | Transport & logistics | 2026 |
| Laurell Consulting Ltd | Real estate | 2018 |
| Lauren Builders Limited | Construction | 2025 |
| Lauren Media Ltd | Wholesale & retail | 2026 |
| Lavender House Care Home LLP | | 2012 |
| Lavender House Peterborough Ltd | Health & social care | 2025 |
| Lavittaa Ltd | Wholesale & retail | 2019 |
| Lawgistics Limited | Other services | 2000 |
| Lawgistics Litigation for the Motor Trade CIC | Professional & scientific | 2023 |
| Lawrence David Limited | Manufacturing | 1973 |
| Lawrence Divine Ltd | Administrative & support | 2016 |
| Lawrence Lettings Ltd | Real estate | 2022 |
| Lawson Hunte Immigration Services Limited | Administrative & support | 2011 |
| Laxton Accountants Ltd | Professional & scientific | 2015 |
| Laxton Construction Limited | Construction | 2026 |
| Laxton Equity Limited | Real estate | 2024 |
| Laxton Estate Limited | Real estate | 2014 |
| Laycey Properties Ltd | Real estate | 2024 |
| Layla's Online Limited | Wholesale & retail | 2015 |
| Laytec Group Ltd | Professional & scientific | 2021 |
| Layton Taylor Ltd | Administrative & support | 2018 |
| Lazenby Electrical Ltd | Construction | 2023 |
| Lazzarini Living Limited | Manufacturing | 2023 |
| LB Clarke Electrical. Ltd | Construction | 2025 |
| LB Scaffolding (Peterborough) Ltd | Construction | 2025 |
| LB Staff Recruitment Ltd | Administrative & support | 2023 |
| Lb&Fj Painting and Decorating Ltd | Construction | 2019 |
| LBK Enterprises Ltd | Wholesale & retail | 2022 |
| Lbki Properties Limited | Real estate | 2022 |
| LBM Global Trading Ltd | Wholesale & retail | 2026 |
| LBR Investment Holdings Limited | Financial services | 2024 |
| LBR Residential Investments Limited | Real estate | 2024 |
| Lbsd Holdings Ltd | Financial services | 2023 |
| LC Driver Ltd | Transport & logistics | 2015 |
| LC Signatures Limited | Other services | 2020 |
| Lceb Property Limited | Real estate | 2025 |
| Lcuk Peterborough Ltd | Other services | 2021 |
| LCW Improvements Limited | Construction | 2017 |
| LCW Partners Ltd | Administrative & support | 2026 |
| LD (Development) Consultants Limited | Professional & scientific | 2019 |
| LD Europe Limited | Wholesale & retail | 2015 |
| LDA Design Consulting Ltd | Professional & scientific | 2014 |
| LDA Design Trustees Limited | Other services | 2021 |
| LDM Processing Services Ltd | Wholesale & retail | 2013 |
| Ldnr Limited | Construction | 2022 |
| LE Monde Consulting Ltd | Information & communication | 2025 |
| LE Tapis Ltd | Wholesale & retail | 2024 |
| Lead Wolf Digital Ltd | Information & communication | 2019 |
| Leadcom Ltd | Information & communication | 2020 |
| Leaderwithin Limited | Education | 2009 |
| Leadfull Ltd | Professional & scientific | 2020 |
| Leadgen Ltd | Professional & scientific | 2020 |
| Leadmill Residents Company Limited | Households | 2001 |
| Leadtec Ltd | Information & communication | 2011 |
| Leafcutter Group Limited | Other services | 2013 |
| Leah Investments Limited | Wholesale & retail | 2019 |
| Leah Properties Ltd | Real estate | 2018 |
| Leah's Legacy Ltd | Health & social care | 2019 |
| Lean Executives Limited | Administrative & support | 2011 |
| Leandal Limited | Administrative & support | 2014 |
| Leanership Ltd | Professional & scientific | 2018 |
| Leaseline the Vehicle Leasing Specialists Ltd | Financial services | 2006 |
| Leaventhorpe Lane Limited | Financial services | 2025 |
| Leconfield (Cranswick Close) Residents Company Limited | Households | 2004 |
| Leda Suspension and HBE Limited | Manufacturing | 2011 |
| Ledbury Sisters Ltd | Real estate | 2020 |
| Ledc Drainage Limited | Water & waste | 2023 |
| Ledg Ltd | Health & social care | 2024 |
| LEE Daniels Photography Limited | Information & communication | 2021 |
| LEE Sutton Heating Limited | Construction | 2013 |
| Lee's Developments Projects Ltd | Real estate | 2025 |
| Leep Accountants Limited | Professional & scientific | 2016 |
| Lees Medical Services Limited | Administrative & support | 2014 |
| Leetodd Training Services Ltd | Professional & scientific | 2026 |
| Leeton Holdings Limited | Financial services | 2022 |
| Leeton Investments Ltd | Real estate | 2022 |
| Leewick Services Ltd | Professional & scientific | 2023 |
| Leewood Developments Limited | Extraterritorial | 1971 |
| Legaci Limited | Information & communication | 2020 |
| Legacy Learning Limited | Information & communication | 2010 |
| Legal AI Agents Limited | Professional & scientific | 2020 |
| LEGAL4SCHOOLS Ltd | Extraterritorial | 2014 |
| Legaleasy Ltd | Professional & scientific | 2008 |
| Legend Motorcycle Parts Ltd | Wholesale & retail | 2015 |
| Legendes Products Ltd | Manufacturing | 2004 |
| Legred Limited | Real estate | 2021 |
| Lehman Bros. Ltd | Information & communication | 2023 |