| Kids Go Wild Ltd | Education | 2025 |
| Kiki & ME Limited | Wholesale & retail | 2024 |
| Kilham Properties Ltd | Real estate | 2012 |
| Kilmarnock Limited | Real estate | 2016 |
| Kimbo Shorts Ltd | Manufacturing | 2026 |
| King Street Cottingham Flats Limited | Households | 1977 |
| Kingdom Project Solutions Limited | Professional & scientific | 2011 |
| Kingfisher Leisure Parks Limited | Hospitality | 2011 |
| Kings Sales and Lettings Ltd | Real estate | 2026 |
| Kingston Chambers Management Limited | Households | 2003 |
| Kingston Cladding (Hull) Ltd | Construction | 2019 |
| Kingston Cleaning Limited | Extraterritorial | 2025 |
| Kingston Cleaning Services (Hull) Limited | Administrative & support | 2006 |
| Kingston Court Management Company (Hull) Limited | Households | 2002 |
| Kingston Developments Roofing & Maintenance Ltd | Construction | 2022 |
| Kingston Engineering and Project Management Ltd | Construction | 2008 |
| Kingston Family Law Ltd | Professional & scientific | 2023 |
| Kingston GAS Services Ltd | Construction | 2023 |
| Kingston Holding Limited | Real estate | 2011 |
| Kingston Homes (East Riding) Limited | Construction | 1999 |
| Kingston Leasing Limited | Construction | 2000 |
| Kingston Marine Services Limited | Administrative & support | 1998 |
| Kingvale Developments Limited | Extraterritorial | 2015 |
| Kipcom Limited | Information & communication | 2012 |
| Kisdon Properties Ltd | Real estate | 2021 |
| Kisobi Limited | Real estate | 2023 |
| Kiss ME Costumes Limited | Wholesale & retail | 2025 |
| Kitchman Consulting Ltd | Professional & scientific | 2026 |
| Kite Children's Services Ltd | Health & social care | 2023 |
| KJ Events Limited | Hospitality | 2024 |
| Kjah Properties Limited | Real estate | 2025 |
| KJS Building Ltd | Construction | 2023 |
| KJS Installations Ltd | Construction | 2016 |
| KJS Landscaping Ltd | Administrative & support | 2026 |
| KK Accommodation Hull Ltd | Construction | 2019 |
| KK Automotive Ltd | Wholesale & retail | 2022 |
| KK Maintenance Hull Ltd | Administrative & support | 2022 |
| Kkool Ltd | Construction | 2026 |
| KL Tech Services Ltd | Construction | 2013 |
| Kmct Trustee Limited | Other services | 2021 |
| Kneesh Ltd | Professional & scientific | 2017 |
| Knights Garth Eggs Ltd | Agriculture & fishing | 2016 |
| Knights Garth Organic Eggs Limited | Wholesale & retail | 2020 |
| KNP Holdings Limited | Financial services | 2025 |
| Knwe Property Co Limited | Real estate | 2018 |
| Koalemos Limited | Information & communication | 2026 |
| KP Mini Market Ltd | Wholesale & retail | 2018 |
| Kpsr CF Limited | Real estate | 2016 |
| KVL Beauty Services Ltd | Other services | 2020 |
| Kyme Homes Limited | Construction | 2016 |
| Kyme Real Estate Limited | Construction | 2014 |
| Kyst Huse Ltd | Construction | 2015 |
| L & B Property Group Ltd | Real estate | 2026 |
| L a T Property Services Ltd | Construction | 2023 |
| L B Landscape Services Ltd | Administrative & support | 2023 |
| L Peterson Joinery Services Limited | Construction | 2002 |
| L Tech Complete Ltd | Professional & scientific | 2023 |
| L W Construction Services Ltd | Professional & scientific | 2022 |
| L.S.G Roofing Limited | Construction | 2022 |
| LA Fleur Noire BU Ltd | Wholesale & retail | 2026 |
| LA Performance Ltd | Other services | 2024 |
| La's Community Care Ltd | Health & social care | 2021 |
| LAB Air Ltd | Manufacturing | 2020 |
| Labtack Ltd | Construction | 2021 |
| LAC Homes Limited | Real estate | 2011 |
| Ladacre Ltd | Agriculture & fishing | 2006 |
| Ladygate Properties Limited | Real estate | 2022 |
| Lairgate Consultancy Limited | Professional & scientific | 2026 |
| Lairgate Financial Ltd | Financial services | 2015 |
| Lairgate Galleries Limited | Real estate | 2003 |
| Lairgate Management Company Limited | Households | 1975 |
| Lairgate Motors Limited | Wholesale & retail | 2002 |
| Lambert Investment Properties Ltd | Real estate | 2022 |
| Land Drainage Consultancy (Holdings) Ltd | Professional & scientific | 2022 |
| Land Drainage Consultancy Limited | Professional & scientific | 2003 |
| Landmark Riverside Limited | Real estate | 2005 |
| Langdale Corporate Services Limited | Administrative & support | 2013 |
| Larards Commercial Limited | Real estate | 2003 |
| Larter Company Ltd | Real estate | 2022 |
| LAS Vegas Nails (DH) Limited | Other services | 2019 |
| Laser Products Europe Limited | Extraterritorial | 2024 |
| Launchselect Limited | Construction | 1991 |
| LB Contract Services Ltd | Administrative & support | 2025 |
| Lblocums Limited | Health & social care | 2022 |
| Leading Capital Limited | Financial services | 2022 |
| Leading Production Equipment Ltd | Wholesale & retail | 2012 |
| Leap Education Limited | Administrative & support | 1997 |
| Leasium Limited | Administrative & support | 2024 |
| Leather Solutions Yorkshire Limited | Manufacturing | 2024 |
| Leconfield Carrs CIC | Education | 2021 |
| Leconfield Software Ltd | Administrative & support | 2016 |
| LEE (Chinese Style Therapy) Limited | Other services | 2021 |
| Legalcrown Properties Limited | Real estate | 1996 |
| LEH Plant Hire Limited | Administrative & support | 2015 |
| Leisure JD Ltd | Hospitality | 2024 |
| Lemon Cherry Limited | Administrative & support | 2005 |
| LEN Taylor Builders Limited | Construction | 2015 |
| LEO Lala Limited | Real estate | 2019 |
| LEO Property Investment Limited | Real estate | 2019 |
| Leroux Management Ltd | Construction | 2019 |