| LB Threading Ltd | Other services | 2022 |
| LBP Services Limited | Construction | 2026 |
| LCL Engineering Support Ltd | Wholesale & retail | 2021 |
| LCT Commercials Ltd | Wholesale & retail | 2026 |
| LD Agency Ltd | Information & communication | 2025 |
| LDP Construction Ltd | Information & communication | 2016 |
| LEA Meadows RTM Company Limited | Households | 2008 |
| Leaderkind Ltd | Professional & scientific | 2014 |
| Leaf Technology Limited | Information & communication | 2006 |
| Leamington Gate Limited | Real estate | 2013 |
| Leann Consulting Ltd | Hospitality | 2020 |
| Learnstor Ltd | Construction | 2020 |
| Ledgers & Logistics Limited | Transport & logistics | 2026 |
| Leemoll Design Ltd | Manufacturing | 2020 |
| Leemoll Publishing Limited | Manufacturing | 2004 |
| LEF Joinery Ltd | Manufacturing | 2020 |
| Leftseven Limited | Information & communication | 2018 |
| Leighton Buzzard Angling Club | Arts & recreation | 1985 |
| Leighton Buzzard Bowling Club Limited | Arts & recreation | 2010 |
| Leighton Buzzard DRY Lining & Suspended Ceilings Limited | Construction | 2015 |
| Leighton Buzzard Golf Club Limited | Arts & recreation | 2016 |
| Leighton Buzzard Hockey Club Limited | Arts & recreation | 2021 |
| Leighton Buzzard Light Railway Limited(The) | Professional & scientific | 1919 |
| Leighton Buzzard Office Lets Ltd | Real estate | 2024 |
| Leighton Buzzard Railway Limited | Transport & logistics | 1988 |
| Leighton Buzzard Rugby Football Club Limited | Arts & recreation | 2010 |
| Leighton Food Ltd | Hospitality | 2023 |
| Leighton Fried Chicken Ltd | Hospitality | 2023 |
| Leighton Frost Ltd | Hospitality | 2025 |
| Leighton Hire Centre Limited | Administrative & support | 2001 |
| Leighton Linslade and District Citizens Advice Bureau | Health & social care | 2006 |
| Leighton Spice Ltd | Hospitality | 2024 |
| Leighton Surveyors Ltd | Professional & scientific | 2026 |
| Leisuretec Distribution Limited | Arts & recreation | 1991 |
| Lenfred Services Ltd | Information & communication | 2024 |
| Leon Hargreaves Photography Limited | Professional & scientific | 2007 |
| LES Hine Limited | Professional & scientific | 2009 |
| Lestone Property Limited | Real estate | 2022 |
| Lestone Veterinary Centre Limited | Professional & scientific | 2013 |
| Letchmore Systems Ltd | Information & communication | 2005 |
| Letwinnie Healthcare Services Ltd | Health & social care | 2014 |
| Letz Live Limited | Administrative & support | 2017 |
| Levant U.P.S. Limited | Other services | 2006 |
| Level Brickwork Ltd | Construction | 2021 |
| Lew's Collections Limited | Manufacturing | 2025 |
| Lewin Park (Langford) Management Company Limited | Real estate | 2022 |
| Lexie HC Limited | Professional & scientific | 2018 |
| LF Carpentry Ltd | Construction | 2012 |
| LF Truck Tech Ltd | Wholesale & retail | 2019 |
| LG Property Limited | Real estate | 2016 |
| LGF Aluminium Machinery Limited | Manufacturing | 2016 |
| Lgtc Apprentices Limited | Education | 2026 |
| LHC (LB) Limited | Administrative & support | 2024 |
| LHW Partnership LLP | | 2013 |
| Liana Healthcare Ltd | Health & social care | 2025 |
| Libra Services Ltd | Administrative & support | 2020 |
| Lifeline Roofing Limited | Construction | 2022 |
| Lifesigns Music Limited | Arts & recreation | 2013 |
| Liftio Services Ltd | Transport & logistics | 2025 |
| Light Life Electrical Ltd | Construction | 2024 |
| Lighthouse Studio Limited | Professional & scientific | 2024 |
| Lighton Electrics Ltd | Construction | 2026 |
| Liliana Cannas Ltd | Professional & scientific | 2022 |
| LIME29 Ltd | Construction | 2023 |
| Limitless Plumbing Services Limited | Construction | 2021 |
| Lincy Company Limited | Real estate | 2020 |
| Lindal Valve Company Limited | Manufacturing | 1959 |
| Lingstar Limited | Construction | 1996 |
| Link Ventures Limited | Extraterritorial | 1998 |
| Linney Court LLP | | 2021 |
| Linslade Car Boot Limited | Administrative & support | 2017 |
| Linslade Mews Limited | Other services | 2025 |
| Linslade Old Stables Management Co Limited | Real estate | 2005 |
| Linton Design and Manufacture Limited | Manufacturing | 1996 |
| Lion Cubs Football Play Limited | Education | 2023 |
| Lion Labs Media Limited | Information & communication | 2025 |
| Lions NXT Generation Limited | Education | 2024 |
| Liscombe Health Club Limited | Arts & recreation | 2010 |
| Little Greencroft Management Company Limited | Households | 2021 |
| Little Robs Limited | Wholesale & retail | 2025 |
| Little Widefield Agricultural Land Limited | Agriculture & fishing | 2015 |
| Littlebrick Workshop Ltd | Wholesale & retail | 2024 |
| Littler Company Limited | Extraterritorial | 1952 |
| Live Music Ltd | Professional & scientific | 2012 |
| Livid Tyres Group Ltd | Wholesale & retail | 2025 |
| Livingfit Limited | Arts & recreation | 2006 |
| Livingstone Building Service Ltd | Construction | 2024 |
| LJA Holdings Limited | Real estate | 2025 |
| Ljtv Limited | Professional & scientific | 2023 |
| LKL Software Limited | Information & communication | 2014 |
| LKM Therapy Ltd | Professional & scientific | 2023 |
| Lloyd Vaughan Holdings Limited | Financial services | 2016 |
| LLX Holdings Ltd | Financial services | 2023 |
| LM Finance Services Limited | Professional & scientific | 2008 |
| LMA Rugby Limited | Education | 2025 |
| LMC Carpentry and Joinery, Property Refurbishment and Maintenance Ltd | Construction | 2022 |
| LMK Leisure Ltd | Hospitality | 2021 |
| LMP Electrics Ltd | Energy | 2015 |
| LMP Fabrications Limited | Manufacturing | 2012 |
| Load UP Transport Ltd | Transport & logistics | 2021 |