| KP Solicitors Limited | Professional & scientific | 2014 |
| Krbh Ltd | Wholesale & retail | 2015 |
| KST Catering Limited | Hospitality | 2019 |
| Kute Fine Art Limited | Wholesale & retail | 2020 |
| KVM Developments Limited | Construction | 2018 |
| KVM Holdings Limited | Real estate | 2018 |
| KVM Investments Limited | Real estate | 2018 |
| L a Property Services (Scot) Ltd | Construction | 2019 |
| L C Consulting Services (Derby) Ltd | Professional & scientific | 2024 |
| L.Bamford Brickwork & Construction Ltd | Construction | 2025 |
| L.Burdekin & Sons Limited | Agriculture & fishing | 1952 |
| Landlord Cleaning Services Limited | Administrative & support | 2018 |
| Landtech Surveys Limited | Professional & scientific | 2011 |
| Langley Landscaping Services Limited | Administrative & support | 2002 |
| Languages for ALL Ltd | Education | 2021 |
| LAR Design Ltd | Wholesale & retail | 2019 |
| Larks Ameus Ltd | Real estate | 2016 |
| Last Shot Productions Ltd | Information & communication | 2021 |
| Latip Group Ltd | Real estate | 2017 |
| Laura Jake William Ltd | Professional & scientific | 2019 |
| Lauren Halley Spmu Aesthetics Limited | Other services | 2018 |
| Lauren Potter Properties Limited | Real estate | 2018 |
| Lavender Grey Homes Limited | Real estate | 2015 |
| Lavender Grey Limited | Wholesale & retail | 2010 |
| Lawn Farm Limited | Agriculture & fishing | 2025 |
| Lawrence Specialist IT Ltd | Information & communication | 2019 |
| Lcdcproperty Ltd | Real estate | 2023 |
| Lean Intelligence Ltd | Information & communication | 2026 |
| Leapforward Thinking Ltd | Professional & scientific | 2018 |
| Leaps and Bounds Day Nursery Limited | Extraterritorial | 2014 |
| Learning Through Drama Limited | Education | 2008 |
| Leek & District FLY Fishing Limited | Agriculture & fishing | 2020 |
| Leisure Events 2 Limited | Arts & recreation | 2024 |
| Leisure Events Limited | Arts & recreation | 2012 |
| Leisure Events on Ice Limited | Arts & recreation | 2025 |
| Lemonade Creative Ltd | Administrative & support | 2026 |
| Lennox Global Holdings Limited | Information & communication | 2023 |
| Lester & NIX Limited | Wholesale & retail | 2021 |
| Letsmith Group Limited | Real estate | 2025 |
| Level 83 Ltd | Information & communication | 2023 |
| Lexster Property Ltd | Real estate | 2025 |
| Lick Decorating Ltd | Construction | 2021 |
| Light Track International Ltd | Professional & scientific | 2026 |
| Lightning FOX Tattoos Ltd | Other services | 2025 |
| Ligo Wigglesworth Consulting Limited | Other services | 2022 |
| Lime Tree Renovations Ltd | Construction | 2020 |
| Limelight Events Limited | Administrative & support | 2007 |
| Lindsay Flooring Limited | Construction | 2010 |
| Lister International Logistics Limited | Transport & logistics | 2004 |
| Litchfield Bros. Limited | Manufacturing | 1951 |
| Litchfield Group Limited | Professional & scientific | 1987 |
| Litchfield Investments Holdings Limited | Real estate | 1956 |
| Little Eaton Garage Ltd | Wholesale & retail | 2013 |
| Little Hoppers Ltd | Arts & recreation | 2021 |
| LJ Consultancy (Duffield) Ltd | Professional & scientific | 2020 |
| LK Electrical and Fire Services Limited | Construction | 2014 |
| Loaffilms Ltd | Information & communication | 2023 |
| Local Pest UK Ltd | Administrative & support | 2023 |
| Lockwood Freight Services Limited | Extraterritorial | 1987 |
| Lockwood Properties Limited | Real estate | 2001 |
| London Surgeon Ltd | Health & social care | 2019 |
| Lonescout Bushcraft Limited | Other services | 2009 |
| Loscoe Electrical C&I Limited | Construction | 2021 |
| Love Belper CIC | Other services | 2024 |
| LOW Gravity Limited | Extraterritorial | 2002 |
| Lower Burley View Management Company Limited | Real estate | 2020 |
| Loxley Mechanical Services Limited | Construction | 2006 |
| LP Ceramics Limited | Construction | 2023 |
| LP Deliveries Ltd | Transport & logistics | 2024 |
| LSC Property Services Limited | Real estate | 2015 |
| Lucy Coulthard Interior Design Limited | Professional & scientific | 2014 |
| Lucy's Swim School Limited | Arts & recreation | 2017 |
| Lullington Estates Limited | Real estate | 1999 |
| Luminary Vision Limited | Real estate | 2021 |
| Lunar Technologies Ltd | Information & communication | 2006 |
| LUX Comps Ltd | Other services | 2025 |
| M & S Mcnalty Limited | Transport & logistics | 2002 |
| M 1 K Warriors Limited | Arts & recreation | 2014 |
| M a H Belper Limited | Hospitality | 2023 |
| M Brown Bids and Projects Ltd | Professional & scientific | 2019 |
| M J C Construction (UK) Limited | Construction | 2012 |
| M J Grace Limited | Construction | 2003 |
| M J Kunica Developments Ltd | Construction | 2025 |
| M Rose Holdings Ltd | Financial services | 2024 |
| M T Electrical Services Belper Limited | Construction | 2017 |
| M&V Group Limited | Construction | 2009 |
| M.A.V Painting and Decorating Limited | Construction | 2016 |
| M.Hallam Engineering Limited | Manufacturing | 2018 |
| M.M. & J.L. Slack & Sons Limited | Agriculture & fishing | 2013 |
| MAC Tree Services Ltd | Agriculture & fishing | 2013 |
| Made to Measure Gates Limited | Manufacturing | 2026 |
| Magical Curiosities Limited | Wholesale & retail | 2023 |
| MAID2CLEAN Derby Ltd | Other services | 2013 |
| Maintenance Painting Systems Limited | Construction | 1983 |
| Maisey Limited | Professional & scientific | 2026 |
| Make a Meal of IT Events Limited | Hospitality | 2022 |
| Make a Meal of IT Limited | Hospitality | 2022 |
| Malik Entertainment Limited | Arts & recreation | 2017 |
| Management Accounts Enterprise Ltd | Professional & scientific | 2023 |
| Manzanilla Eighteen Limited | Administrative & support | 2005 |