| Kismet Restaurant Hull Ltd | Hospitality | 2024 |
| Kitchen Bargain Ltd | Hospitality | 2022 |
| Kitchen Hygiene Cleaning Services Limited | Other services | 2009 |
| Kitchens by Design (Hull) Limited | Wholesale & retail | 2006 |
| Kitcho Bath Refurb Ltd | Other services | 2025 |
| Kits (Hull) Limited | Information & communication | 2014 |
| Kitsilano Consulting Ltd | Professional & scientific | 2024 |
| Kizz.Io Ltd | Information & communication | 2017 |
| KJC Financial Solutions Limited | Financial services | 2017 |
| KJP Construction & Engineering Limited | Professional & scientific | 2014 |
| KJR Design & Project Management Ltd | Construction | 2010 |
| KJS Composites Ltd | Wholesale & retail | 2018 |
| KJS Properties Hull Ltd | Real estate | 2023 |
| KK Accommodation Lets Ltd | Construction | 2025 |
| KK Accommodation Ltd | Construction | 2024 |
| Kkts Investment Holdings Ltd | Real estate | 2025 |
| KL Express Ltd | Transport & logistics | 2026 |
| Klaafe Property Management Ltd | Real estate | 2021 |
| KLD Auto Spa Ltd | Administrative & support | 2025 |
| Kleijnen Systematic Reviews Holdings Ltd | Financial services | 2022 |
| Klinique Plus Limited | Information & communication | 2026 |
| KLM Developments Limited | Other services | 2020 |
| KLM Homes Limited | Real estate | 2022 |
| Klonme Limited | Information & communication | 2026 |
| KLR Electrical Ltd | Construction | 2022 |
| KLS Safety Ltd | Administrative & support | 2025 |
| KM Shopfitters Ltd | Construction | 2015 |
| KMC (Hull) Limited | Real estate | 2022 |
| KMC Blade Repair Ltd | Manufacturing | 2026 |
| KMF1 Ltd | Health & social care | 2025 |
| KMH Holdings (Yorkshire) Limited | Financial services | 2022 |
| KMS PDK Limited | Wholesale & retail | 2019 |
| KMS22 Ltd | Health & social care | 2022 |
| Knapton Farms Limited | Agriculture & fishing | 2003 |
| Knight and Day Properties Ltd | Hospitality | 2024 |
| Knight Horizon Ltd | Wholesale & retail | 2026 |
| Knight Investment Group Ltd | Financial services | 2025 |
| Knight Project Solutions Ltd | Construction | 2025 |
| Knightsbridge Bespoke Ltd | Manufacturing | 2024 |
| Knit One, Stitch One Limited | Wholesale & retail | 2017 |
| Know Pharma Ltd | Information & communication | 2025 |
| Knuts Software Ltd | Information & communication | 2025 |
| Kobis Haven Ltd | Wholesale & retail | 2026 |
| KOC Holdings Ltd | Real estate | 2001 |
| Koda Studios Ltd | Manufacturing | 2013 |
| Koda Transport and Logistics Ltd | Transport & logistics | 2024 |
| Kodexflow Ltd | Information & communication | 2025 |
| KOF Construction Limited | Construction | 2024 |
| Kolize Hedon Limited | Hospitality | 2023 |
| Kondor Exports Ltd | Construction | 2024 |
| Kondor Pods Ltd | Construction | 2012 |
| Konig Heating Solutions Ltd | Construction | 2023 |
| Konig Homes Ltd | Real estate | 2025 |
| Korey Properties Limited | Real estate | 2025 |
| Korna Ltd | Hospitality | 2025 |
| Koryem Properties Limited | Real estate | 2026 |
| Kossma Limited | Health & social care | 2023 |
| Kotwal Limited | Health & social care | 2016 |
| Kougiouroukis Hospitality Ltd | Hospitality | 2025 |
| Kowerk CS Ltd | Professional & scientific | 2022 |
| Kowerk Ltd | Real estate | 2013 |
| KOÇ & Ozdoev Investments Limited | Real estate | 2023 |
| Kpht Ltd | Construction | 2025 |
| Kpperfusion Limited | Health & social care | 2024 |
| KPS Building Services Ltd | Construction | 2017 |
| KR Pro Services Limited | Professional & scientific | 2025 |
| KR1 (Europe) Limited | Professional & scientific | 2013 |
| Krakow International (Hull) Limited | Wholesale & retail | 2020 |
| Kralk Audio Ltd | Manufacturing | 2020 |
| Kram Signs and Graphics Limited | Arts & recreation | 2010 |
| Kratos Digital Ltd | Professional & scientific | 2026 |
| Krisbal Global Services Ltd | Manufacturing | 2024 |
| Krislight Limited | Health & social care | 2013 |
| Krisx Electrical Services Ltd | Construction | 2022 |
| KRL (Leeds) Limited | Administrative & support | 2024 |
| KRL Holdings Limited | Financial services | 2009 |
| KRM Flooring Ltd | Construction | 2024 |
| Krystal Clear Minds Ltd | Administrative & support | 2026 |
| Krystal Klear Hull Limited | Other services | 2014 |
| Krystiano Constructions Ltd | Construction | 2024 |
| KRZ Property Ltd | Construction | 2025 |
| Krzysztof Kuczaj Holdings Ltd | Financial services | 2025 |
| KS Corporation Group Ltd | Other services | 2022 |
| KS Electrical Services (Hull) Limited | Construction | 2019 |
| KS9 Holdings Limited | Financial services | 2024 |
| KSK Ventures Limited | Professional & scientific | 2017 |
| Ksoc Limited | Health & social care | 2022 |
| KSR Evidence Ltd | Information & communication | 2022 |
| KSR Publishing Ltd | Information & communication | 2022 |
| KSR Rigging Limited | Other services | 2019 |
| Kstar Removals Limited | Water & waste | 2025 |
| KTB Developments Ltd. | Real estate | 2022 |
| KTB Homes Ltd | Real estate | 2026 |
| Ktcp Ltd | Real estate | 1998 |
| KTK Building Limited | Construction | 2022 |
| KTM Meal Ltd | Hospitality | 2026 |
| Kube Group Ltd | Construction | 2024 |
| Kubex (U.K.) Limited | Manufacturing | 2009 |
| Kubus Market Ltd | Wholesale & retail | 2025 |
| Kuchnia Restaurant Limited | Hospitality | 2009 |