| Keppel Plumbing and GAS Services Limited | Construction | 2008 |
| Kestrel Services Limited | Other services | 2015 |
| KEV Pipe Builders Limited | Construction | 2018 |
| KJ Fast Foods Ltd | Hospitality | 2025 |
| KJP Shellfish Ltd | Agriculture & fishing | 2012 |
| Klass Investments Limited | Real estate | 2017 |
| KLM Yorkshire Properties Limited | Real estate | 2025 |
| KMA Properties Limited | Construction | 2009 |
| KMA Trading Limited | Hospitality | 2006 |
| Koko Coffee Shops Limited | Wholesale & retail | 2022 |
| Kozee Komforts Limited | Other services | 2024 |
| Kozee Pets Limited | Other services | 2024 |
| KRM Joinery Limited | Construction | 2017 |
| Krown Jools Limited | Wholesale & retail | 2014 |
| KRS Vehicle Maintenance Ltd | Wholesale & retail | 2011 |
| L G Roofing and Scaffolding Limited | Construction | 2011 |
| L Hales Ltd | Other services | 2025 |
| L J Harrison Electrical Limited | Construction | 2014 |
| L M Bespoke Chalets Limited | Manufacturing | 2026 |
| L W Rentals Ltd | Real estate | 2025 |
| L&S Wholesale Ltd | Wholesale & retail | 2025 |
| LA Pizzeria Bridlington Limited | Hospitality | 2019 |
| Labelequipuk Limited | Administrative & support | 2025 |
| Lakeside Property Holdings Ltd | Real estate | 2021 |
| Lakin & Croft Financial Services Limited | Financial services | 2025 |
| Lakin & Croft Properties Limited | Real estate | 2022 |
| Lamcatec U.K. Limited | | 1973 |
| Lana Brown Limited | Health & social care | 2004 |
| Lance Brook Properties Limited | Real estate | 2025 |
| Langley Joinery Services Limited | Construction | 2021 |
| Larkhams Holiday Parks Limited | Hospitality | 2017 |
| Laws Fishing Limited | Agriculture & fishing | 2020 |
| Laws Roofing Services Limited | Construction | 2021 |
| LDP Asset Management Limited | Financial services | 2019 |
| LDP Holdings Ltd | Financial services | 2019 |
| Learner Scout Ltd | Administrative & support | 2026 |
| LEE Newby Ltd | Professional & scientific | 2025 |
| Leeds Cardiology Services Limited | Health & social care | 2019 |
| Legacy Scaffolding Ltd | Construction | 2025 |
| Leggatt Holdings (Yorkshire) Limited | Construction | 2020 |
| Leisure Resorts Limited | Hospitality | 2016 |
| Leoz Limited | Hospitality | 2002 |
| Leozan Ltd | Wholesale & retail | 2021 |
| Lewis J White Ltd | Information & communication | 2025 |
| Lezziz Ltd | Hospitality | 2018 |
| Liam Thomas Dunn Plumbing and Heating Limited | Construction | 2025 |
| Library of James Limited | Wholesale & retail | 2025 |
| Liggetts Meat Company Limited | Wholesale & retail | 2021 |
| Lighthouse Properties Bridlington Ltd | Households | 2022 |
| Lightspeed Telecommunications Ltd | Information & communication | 2020 |
| Lily Rose Properties Ltd | Households | 2023 |
| Linford Civil Engineering Ltd | Construction | 2017 |
| Linford Plant and Rental Ltd | Administrative & support | 2023 |
| LIU Advisory Services Limited | Professional & scientific | 2024 |
| Lklb Properties Ltd | Real estate | 2019 |
| Lloyd Dowson Audit Limited | Professional & scientific | 2016 |
| Lloyd Dowson Limited | Professional & scientific | 1995 |
| LMC Couriers Ltd | Transport & logistics | 2021 |
| Loaf Lane Ltd | Real estate | 2024 |
| Local Fibre Networks Limited | Information & communication | 2016 |
| Local Idea Limited | Professional & scientific | 2009 |
| Locurx Limited | Professional & scientific | 2023 |
| Lodge Site UK Limited | Hospitality | 2023 |
| London Seafront Apartments RTM Company Ltd | Households | 2022 |
| London Security Protection Ltd | Administrative & support | 2023 |
| Long Acre Farm Properties Limited | Real estate | 2010 |
| Lotus Circle UK Ltd | Professional & scientific | 2022 |
| Love Holiday Homes Limited | Manufacturing | 2021 |
| Lovit Properties Ltd | Real estate | 2026 |
| Lowfield Leisure Limited | Hospitality | 2007 |
| Lung Fung Pavilion Ltd | Hospitality | 2015 |
| Luxihomes Limited | Wholesale & retail | 1986 |
| Luxlodge Limited | Hospitality | 2021 |
| LV Payroll Limited | Professional & scientific | 2014 |
| Lycoris Studio Ltd. | Information & communication | 2025 |
| Lyon Property (Yorkshire) Ltd | Real estate | 2025 |
| Lystra Management Ltd | Real estate | 2023 |
| M & K Wilson Limited | Hospitality | 2018 |
| M and L Stuart Business Ltd | Hospitality | 2021 |
| M and N Trace Heating Limited | Construction | 2011 |
| M Hotel Bridlington Limited | Arts & recreation | 2025 |
| M J Sissons Roofing Services Ltd | Construction | 2017 |
| M R H S (Yorkshire) Limited | Administrative & support | 2022 |
| M Taylor Windows and Doors Limited | Manufacturing | 2020 |
| M W Jackson Limited | Hospitality | 2013 |
| M&J Building Solutions Ltd | Construction | 2026 |
| M&P Facilities Limited | Construction | 2016 |
| M. W. Truck Parts Ltd | Manufacturing | 2015 |
| MAC Cladding Systems Ltd | Construction | 2019 |
| Macfarlane CC Limited | Construction | 2016 |
| Maiden Voyage Films Limited | Professional & scientific | 2025 |
| Major Lettings Ltd | Real estate | 2024 |
| Malton Crane Hire Limited | Administrative & support | 2025 |
| Malton Investments 2021 Ltd | Extraterritorial | 2021 |
| Manchot Restaurant Ltd | Hospitality | 2021 |
| Manic Holdings Limited | Financial services | 2026 |
| Manic Hospitality Limited | Hospitality | 2026 |
| Manor Court (Bridlington) Limited | Hospitality | 2014 |
| Manor Farm Bempton Limited | Real estate | 2022 |
| Manor Farm Caravan Sales Limited | Professional & scientific | 2010 |