| Killerby Estates Limited | Real estate | 2016 |
| Kinder Place Limited | Education | 2010 |
| King's Driving Services Limited | Transport & logistics | 2018 |
| Kingfisher Building and Property Group Ltd | Real estate | 2025 |
| Kingfisher Geological Services Ltd | Mining & quarrying | 2017 |
| Kingston Auto Repairs (Hull) Ltd | Wholesale & retail | 2022 |
| Kirkstones Investment Group Limited | Real estate | 2018 |
| Kirokiroimports Limited | Wholesale & retail | 2025 |
| Kita & Kuro Enterprises Limited | Hospitality | 2017 |
| Kjsm Ltd | Information & communication | 2017 |
| Klrs Consulting Limited | Professional & scientific | 2018 |
| Kmat Limited | Real estate | 2022 |
| KMG Mech Solutions Limited | Professional & scientific | 2023 |
| Knights Investment Management Limited | Financial services | 2014 |
| Krabby Collects Ltd | Wholesale & retail | 2026 |
| Krash Labs Digital CIC | Information & communication | 2018 |
| Kridan Access Ltd | Administrative & support | 2019 |
| Kridan Handling Limited | Administrative & support | 2012 |
| Kridan Heating Solutions Ltd | Construction | 2022 |
| Kridan Limited | Extraterritorial | 2012 |
| Kronik Warrior UK Community Interest Company | Health & social care | 2021 |
| Krownplus Limited | Manufacturing | 2025 |
| Kruxify Ltd | Wholesale & retail | 2025 |
| Kurdishstan Grill and Shisha Bar Limited | Hospitality | 2026 |
| KV Property Services Ltd | Construction | 2019 |
| Kyle Armstrong Groundworks & Civil Engineering Limited | Construction | 2015 |
| Kyle MAY Brickwork Ltd | Construction | 2017 |
| Kyle MAY Group Limited | Financial services | 2026 |
| Kyle MAY Properties Limited | Real estate | 2026 |
| L & C Masucci Limited | Hospitality | 2011 |
| L D Properties (Scarborough) Limited | Real estate | 2024 |
| L J Fisheries Ltd | Agriculture & fishing | 2024 |
| L Mellor Ltd | Education | 2020 |
| L&S Construction (North) Ltd | Construction | 2025 |
| L&S Properties Scarborough Ltd | Real estate | 2024 |
| L.M.Davies Building & Maintenance Limited | Construction | 2006 |
| L64 Ltd | Professional & scientific | 2024 |
| LA Boxing Ltd | Professional & scientific | 2025 |
| LA Pizzeria Time Scarborough Ltd | Hospitality | 2022 |
| LA Unica (Scarborough) Ltd | Hospitality | 2024 |
| Lady Ediths Holiday Park Limited | Hospitality | 2020 |
| Ladyincharge UK Limited | Wholesale & retail | 2024 |
| Ladymos Limited | Health & social care | 2024 |
| Lagom Services Ltd | Information & communication | 2022 |
| Lahoy Ltd | Wholesale & retail | 2015 |
| Lak-Mav Residencies Limited | Real estate | 2026 |
| Lakeside Holdings Limited | Real estate | 2004 |
| LAM (Scarborough) Ltd | Financial services | 2022 |
| Land of Spice Limited | Hospitality | 2019 |
| Landmark Regions UK Ltd | Professional & scientific | 2006 |
| Langdale's Prestige Plumbing Ltd | Construction | 2014 |
| Langford House Management Limited | Households | 2002 |
| Language Discovery Limited | Education | 2018 |
| LAO Natural Fibres Ltd | Professional & scientific | 2007 |
| Lapis Design Ltd | Professional & scientific | 2019 |
| Larpool Mechanical Repairs Limited | Wholesale & retail | 2012 |
| Laser Print Limited | Information & communication | 2007 |
| Later Years Care Limited | Health & social care | 2006 |
| Latino Heat (Scarborough) Limited | Hospitality | 2010 |
| Laurasia Associates Limited | Professional & scientific | 2007 |
| Laurasia Investments Ltd | Professional & scientific | 2023 |
| Laurel House Trading Limited | Wholesale & retail | 2026 |
| Laurelwood Properties Limited | Real estate | 2021 |
| Lavarsa Ltd | Wholesale & retail | 2025 |
| Lawrence Neil Wealth Management Ltd | Financial services | 2020 |
| Lazer Radio Taxis LLP | | 2013 |
| LB Hotels Ltd | Hospitality | 2025 |
| LB Leisure Ltd | Hospitality | 2015 |
| LCD Properties Ltd | Real estate | 2017 |
| LCP Hospitality Solutions Limited | Hospitality | 2025 |
| LCW Trading Ltd | Wholesale & retail | 2020 |
| LDS Technologies (UK) Limited | Manufacturing | 2009 |
| LDW Property Services Limited | Construction | 2017 |
| Lebberston Holdings Limited | Financial services | 2026 |
| Ledden Developments Limited | Real estate | 2001 |
| Ledden Estates (Whitby) Limited | Real estate | 2013 |
| Ledden Estates Limited | Construction | 2012 |
| Ledden Group Limited | Real estate | 2019 |
| Ledden Properties Limited | Real estate | 2001 |
| Ledden Property Group Ltd | Hospitality | 2025 |
| LEE Electronics Engineering Limited | Professional & scientific | 1995 |
| LEE Howard Plumbing & Heating Engineer Ltd | Construction | 2026 |
| Leed Learning Solutions Ltd | Professional & scientific | 2010 |
| Leefe Car Park Management Company Limited | Financial services | 2026 |
| Leep Food Safety Ltd | Professional & scientific | 2025 |
| Legally Fond Ltd | Professional & scientific | 2025 |
| Legendary IT Solutions Limited | Information & communication | 2020 |
| Lemonhouse Software Limited | Information & communication | 2015 |
| Lenders Group Limited | Real estate | 2021 |
| Leon's of Dean Road Limited | Hospitality | 2025 |
| Lesley Clark Communications Limited | Professional & scientific | 2005 |
| LETIT2U Properties Ltd | Real estate | 2021 |
| Lets GET Locl Limited | Hospitality | 2021 |
| Leyan Shop Ltd | Hospitality | 2024 |
| LG Marketing and Consulting Limited | Other services | 2019 |
| Lgsf Ltd | Manufacturing | 2006 |
| LH Finance Ltd | Financial services | 2019 |
| Liam Darrell Estate Agents Limited | Real estate | 2022 |
| Liberty Retreat Limited | Other services | 2022 |
| Libre Capital Limited | Financial services | 2025 |