| Kultur River C.I.C. | Education | 2025 |
| Kumbar Ltd | Construction | 2025 |
| Kumpang Limited | Health & social care | 2023 |
| Kumpang Properties Limited | Real estate | 2025 |
| Kurdish Barber 1 Ltd | Other services | 2024 |
| Kurdistan Shawarma 1 Ltd | Hospitality | 2024 |
| Kurt Boyer Ltd | Construction | 2018 |
| Kurtis the Barber Limited | Other services | 2025 |
| Kwikframes Limited | Manufacturing | 2002 |
| Kwikhot Heating Solutions Ltd | Manufacturing | 2022 |
| Kwiktuf Holdings Limited | Financial services | 2016 |
| Kwiktuf Limited | Manufacturing | 2003 |
| KY Barbers Ltd | Other services | 2022 |
| Kyle Construction Ltd | Construction | 2006 |
| Kynate Logistics Solutions Limited | Transport & logistics | 2014 |
| K’S Beauty Atelier Ltd | Other services | 2026 |
| L & a Future Investments Ltd | Real estate | 2025 |
| L a Services (Hull) Limited | Construction | 2015 |
| L H Private Limited | Wholesale & retail | 2025 |
| L J C Property Limited | Real estate | 2013 |
| L J Whaley Groundwork, Civil Engineering Contractors Ltd | Construction | 2016 |
| L Jackson (Hull) Ltd | Construction | 2019 |
| L M M Locums Ltd | Administrative & support | 2017 |
| L Martin Property Company Ltd | Real estate | 2019 |
| L Power Plumbing & Heating Ltd | Construction | 2019 |
| L Restaurant Hull Limited | Hospitality | 2025 |
| L Taylor Property Services Limited | Households | 2019 |
| L W Joinery Limited | Construction | 2005 |
| L&A Hot Foods Limited | Hospitality | 2025 |
| L&A Property Works Ltd | Construction | 2026 |
| L&K Developments Limited | Real estate | 2021 |
| L&R Cleaning UK Ltd | Administrative & support | 2021 |
| L&S Electrical Limited | Other services | 2009 |
| L-N Electrical Services Ltd | Construction | 2016 |
| L. a. Hall Group Limited | Financial services | 2026 |
| L.A. Hall (Holdings) Limited | Financial services | 2019 |
| L.A. Reed and SON (Haulage) Limited | Transport & logistics | 1972 |
| L.A.Jagger Ltd | Manufacturing | 2026 |
| L.A.S Renewables Limited | Manufacturing | 2023 |
| L.C.Byass Limited | Agriculture & fishing | 1964 |
| L.G.P. Engineering Limited | Professional & scientific | 2010 |
| L.I.O.N. Outreach UK Ltd | Education | 2022 |
| L3 Essence Ltd | Financial services | 2024 |
| LA Beauty Salon Limited | Other services | 2018 |
| LA Bespoke Ltd | Construction | 2024 |
| LA Bubu Chef Ltd | Hospitality | 2025 |
| LA Burties Ltd | Hospitality | 2024 |
| LA Delizia Hull Limited | Wholesale & retail | 2022 |
| LA Design Workshop Ltd | Manufacturing | 2024 |
| LA Hair Salon Limited | Other services | 2018 |
| LA Hall Ltd | Wholesale & retail | 2025 |
| LA Kitchens Bespoke Ltd | Manufacturing | 2025 |
| LA Maison Properties Ltd | Real estate | 2021 |
| LA Piccolino Limited | Hospitality | 2019 |
| LA Piola Limited | Hospitality | 2010 |
| LA Pizzeria and Hull Limited | Hospitality | 2020 |
| LA Pizzeria Hull Ltd | Hospitality | 2018 |
| LA SBR Ltd | Transport & logistics | 2024 |
| La's Candyland (UK) Limited | Wholesale & retail | 2022 |
| Laavie' Health Care Ltd | Health & social care | 2020 |
| LAB Furniture Limited | Manufacturing | 2018 |
| Labcheck U.K. Limited | Administrative & support | 2000 |
| Label Worx Limited | Information & communication | 2008 |
| Labfx Limited | Manufacturing | 2016 |
| Lacemarket Events & Promotions Limited | Hospitality | 2015 |
| Lads Hull Limited | Health & social care | 2015 |
| Lagoon Hull | Professional & scientific | 2018 |
| LAH Safety Training Limited | Professional & scientific | 2012 |
| Lahori Grill (Hull) Ltd | Hospitality | 2022 |
| Lake Zero Ltd | Hospitality | 2019 |
| Lakeland Estates Limited | Real estate | 2023 |
| Lakrizz Care Limited | Health & social care | 2024 |
| Lalupa Roma (UK) Limited | Hospitality | 2025 |
| Lamb Lettings Hull Limited | Real estate | 2017 |
| Lamb LUX Limited | Construction | 2021 |
| Lambert Associates & Consultancy Ltd | Professional & scientific | 2020 |
| Lambert Body Refinishers Limited | Wholesale & retail | 2015 |
| Lambert Car Sales Limited | Wholesale & retail | 2016 |
| Lambert Construction (Hull) Limited | Construction | 2012 |
| Lambert Plumbers and Heating Engineers Limited | Construction | 2009 |
| Lambert Properties (Hull) Ltd | Administrative & support | 2007 |
| Lambwath Electrical Ltd | Construction | 2021 |
| Laminated Supplies Limited | Manufacturing | 1964 |
| Lammy Sports Limited | Wholesale & retail | 2021 |
| Lampada Digital Solutions Ltd | Information & communication | 2017 |
| Lamsser Limited | Professional & scientific | 2019 |
| Lamsurf UK Ltd | Wholesale & retail | 2015 |
| Lana's Property Limited | Real estate | 2019 |
| Lancaster Building Services Limited | Construction | 2011 |
| Lancaster Way (Brough) Management Company Limited | Households | 2004 |
| Land Allocation Limited | Real estate | 2018 |
| Land and Investment Company of Hull Ltd | Manufacturing | 2019 |
| Land of Leather Direct Limited | Extraterritorial | 2011 |
| Landau Holdings Limited | Manufacturing | 1979 |
| Landers Construction Ltd | Construction | 2023 |
| Landledger UK Limited | Information & communication | 2025 |
| Landlord Logic Limited | Households | 2025 |
| Landmark ABV Limited | Wholesale & retail | 2026 |
| Landplan (G.B.) Limited | Agriculture & fishing | 1983 |
| Landplan Holdings Limited | Professional & scientific | 2025 |