| Kokuryo Properties Ltd | Real estate | 2024 |
| Kost Architects Ltd | Professional & scientific | 2022 |
| Krazy Price Kards Limited | Wholesale & retail | 2002 |
| Krow Agency Ltd | Professional & scientific | 1972 |
| Krow Communications Limited | Professional & scientific | 2005 |
| Krow Kinetic Limited | Professional & scientific | 1998 |
| Kruth Ltd | Construction | 2019 |
| Kukri and Family Ltd | Financial services | 2024 |
| Kynig's Court Maintenance Ltd | Real estate | 2014 |
| L & J Pro Building Contractors Ltd | Construction | 2021 |
| L & R Helping Hands Ltd | Health & social care | 2024 |
| L Vickery Building Contractors Ltd | Construction | 2018 |
| L Vickery Developments Ltd | Construction | 2018 |
| Labeline International Limited | Other services | 2004 |
| Lace Maintenance Ltd | Construction | 2024 |
| Lackie Search Partners Limited | Administrative & support | 2025 |
| Ladderdec Ltd | Manufacturing | 2024 |
| Ladybirds (Barnstaple) Limited | Education | 2014 |
| Ladyswell Kennels Limited | Agriculture & fishing | 2017 |
| Lamb Healthcare Ltd | Health & social care | 2013 |
| Lancaster Leisure Limited | Financial services | 1960 |
| Lancasters Trading & Development Co. Limited | Construction | 1974 |
| Land Developments Limited | Construction | 2001 |
| Landmark F&B Ltd | Arts & recreation | 2018 |
| Landmark Theatres Limited | Arts & recreation | 2021 |
| Landscape Design & Build Service Limited | Professional & scientific | 2002 |
| Lane Buildings Limited | Construction | 2025 |
| Lane Homes Limited | Construction | 2003 |
| Laneslade Dairy Limited | Agriculture & fishing | 2012 |
| Langdon Brothers Limited | Construction | 2000 |
| Lange Group Ltd | Agriculture & fishing | 2020 |
| Langford Electrical Services Limited | Construction | 2023 |
| Lash North Devon Ltd | Other services | 2019 |
| Latitude 51 Flats 4-12 Leaseholders Association Ltd | Households | 2015 |
| Law Property Group Ltd | Real estate | 2019 |
| Layland Crafted Spaces Ltd | Construction | 2026 |
| Lbeazley Consulting Ltd | Professional & scientific | 2025 |
| LBF Limited | Hospitality | 2017 |
| LC Surf Co Ltd | Other services | 2024 |
| Leadership Workshops Limited | Education | 2023 |
| LEE & Williams Solutions Ltd | Construction | 2023 |
| Leeman Build (UK) Ltd | Construction | 2022 |
| Legal & Professional Solutions Limited | Construction | 2015 |
| Leisure Supplies Ltd | Professional & scientific | 2012 |
| Leisureline Construction Limited | Construction | 2002 |
| Lennon and Company Limited | Real estate | 1982 |
| LEO Textiles Limited | Manufacturing | 1981 |
| LEO Workwear Ltd | Other services | 2017 |
| LES Weston Ltd | Construction | 2019 |
| LES Weston Properties Ltd | Real estate | 2022 |
| Let's BE Hyper Limited | Wholesale & retail | 2020 |
| LET2LET Agent (Southwest) Ltd | Real estate | 2025 |
| Letch Lane 1 Ltd | Construction | 2024 |
| Lets Go Bowling Limited | Arts & recreation | 1994 |
| Lets Go Devon Ltd | Arts & recreation | 2025 |
| Letterfest Ltd | Wholesale & retail | 2011 |
| LEV360 Ltd | Professional & scientific | 2026 |
| Level Building Limited | Construction | 2004 |
| Lewis Farms Ltd | Agriculture & fishing | 2013 |
| LGM Enabling Limited | Health & social care | 2023 |
| Life's a Breeze GB Limited | Wholesale & retail | 2007 |
| LIFESTYLE365 Ltd | Wholesale & retail | 2019 |
| Lilley Precision Engineering Limited | Manufacturing | 2004 |
| Lillymittal Fashions Ltd | Wholesale & retail | 2021 |
| Lilypad Associates Limited | Other services | 2011 |
| Lima Design Limited | Administrative & support | 2003 |
| Lime Court Developments Limited | Construction | 2008 |
| Lime Court Partnership LLP | | 2009 |
| Lime Holdings Ltd | Real estate | 2020 |
| Linden Developments Barnstaple Limited | Construction | 2004 |
| Lineal Software Solutions Limited | Information & communication | 2005 |
| Lineup LAB Ltd | Arts & recreation | 2026 |
| Link House Residents Association Limited | Households | 1974 |
| Liquiditi Limited | Manufacturing | 2010 |
| Lisa's Sweetie Treats Ltd | Wholesale & retail | 2026 |
| Lisarb Development Limited | Administrative & support | 2008 |
| Lisarb Distributed Energy Portfolio NO.1 Limited | Other services | 2020 |
| Lisconi Limited | Manufacturing | 2015 |
| Little Butterflies Day Nursery Ltd | Education | 2021 |
| Little Crabthorne Management Company Limited | Real estate | 2006 |
| Live in the Moment Care Limited | Health & social care | 2015 |
| Living Tree Limited | Administrative & support | 2005 |
| Livity Limited | Professional & scientific | 2001 |
| LK and WP Farming LLP | | 2019 |
| Lobb Fields Limited | Hospitality | 1989 |
| Local Appliance Rentals Weymouth Ltd | Administrative & support | 2016 |
| Lodge Life Ltd | Hospitality | 2022 |
| Lodgico Ltd | Construction | 2003 |
| Long Close (Landkey) Management Company Limited | Households | 2025 |
| Longbridge Wharf 2017 Limited | Households | 2018 |
| Longclose Ltd | Construction | 2002 |
| Longcross Scaffolding Ltd | Construction | 2020 |
| Longstone BED and Breakfast Limited | Hospitality | 2020 |
| Loosemorewild Design & Build Limited | Real estate | 2015 |
| Lords Meadow Biogas Limited | Extraterritorial | 2018 |
| Lords Meadow Energy Limited | Energy | 2020 |
| Lords Meadow Energy O & M Limited | Energy | 2020 |
| Lords Meadow Investments Limited | Financial services | 2019 |
| Lorna Doone Management Company Limited | Households | 1995 |
| Lost the Plot Theatrical Limited | Arts & recreation | 2017 |