| John Stone's Beds and Mattresses Ltd | Manufacturing | 2021 |
| John Tate & Co Limited | Financial services | 2021 |
| John Tate Components Limited | Manufacturing | 2023 |
| JON Builders Ltd | Construction | 2025 |
| Jones Public Houses Ltd | Hospitality | 2026 |
| Jono Electrical Ltd | Construction | 2022 |
| Jordan Home Interiors Ltd | Professional & scientific | 2023 |
| Jozsef Builder & Tiling Ltd | Construction | 2022 |
| JR Auto Repairs Ltd | Wholesale & retail | 2025 |
| JRM (Yorkshire) Ltd | Other services | 2019 |
| JT KAY African and Caribbean Store Limited | Wholesale & retail | 2025 |
| JTR Electrical Yorkshire Ltd | Construction | 2024 |
| JUS Corp Limited | Health & social care | 2022 |
| Just Bedding Solutions Ltd | Wholesale & retail | 2024 |
| Just the Jobb Ltd | Construction | 2022 |
| Justtalents Group Ltd | Administrative & support | 2024 |
| JWH Motors Ltd | Wholesale & retail | 2025 |
| JY Tech Ltd | Information & communication | 2025 |
| JYS Autos Limited | Wholesale & retail | 2024 |
| K a Online Ltd | Wholesale & retail | 2018 |
| K G & Sons Ltd | Wholesale & retail | 2013 |
| K Mehmood Enterprise Ltd | Wholesale & retail | 2025 |
| K&B Entertainment Ltd | Hospitality | 2024 |
| K&K Gelato Ltd | Hospitality | 2017 |
| K-Tex Ltd | Financial services | 2021 |
| K.D. Wrigglesworth Limited | Transport & logistics | 1964 |
| K.J. Howley (Electrical) Limited | Energy | 2003 |
| K2 Facilities Management Ltd | Construction | 2015 |
| K2 Holdings Group Ltd | Financial services | 2021 |
| K2 Mechanical and Electrical Services Ltd | Construction | 2007 |
| K2 Mechanical Services Limited | Construction | 2010 |
| K2 UK Properties Ltd | Real estate | 2021 |
| K2S Security Management Ltd | Administrative & support | 2021 |
| K9 Suites & Stays Ltd | Hospitality | 2024 |
| KA Motor Group Ltd | Wholesale & retail | 2026 |
| Kabeer Financial Services Limited | Financial services | 2014 |
| KAD5 Ltd | Other services | 2026 |
| Kadia Property Holdings Limited | Real estate | 2020 |
| Kadz Ltd | Real estate | 2007 |
| Kafila Hajj & Umrah Tours Ltd | Administrative & support | 2019 |
| Kahut Koaching Limited | Education | 2022 |
| Kaima Care Limited | Health & social care | 2022 |
| Kaima Homes Limited | Real estate | 2021 |
| Kallar Syedan Ltd | Wholesale & retail | 2026 |
| Kamakshiamma Ltd | Health & social care | 2023 |
| Kamchoo Ltd | Wholesale & retail | 2025 |
| Kamil and SON Limited | Other services | 2016 |
| KAR - Rich Limited | Real estate | 1985 |
| Karat World Ltd | Wholesale & retail | 2025 |
| Kareema Assets UK Ltd | Real estate | 2022 |
| Karg Investments Ltd | Real estate | 2023 |
| Kash Gateway Limited | Real estate | 2020 |
| Kayflex (UK) Ltd | Manufacturing | 2013 |
| Kayflex Cabinet Ltd | Wholesale & retail | 2025 |
| Kaykraft Ltd | Wholesale & retail | 2008 |
| KDJ Smiles Limited | Health & social care | 2025 |
| Keinemove Limited | Wholesale & retail | 2024 |
| Kekophony Private Limited | Health & social care | 2011 |
| Kenzo Karz Limited | Hospitality | 2025 |
| Kerr Interiors Angling Limited | Wholesale & retail | 2009 |
| Kerr Interiors Limited | Construction | 1995 |
| Kevin's Butchers Limited | Wholesale & retail | 2011 |
| Keystone Gate Watch & Security Solutions Ltd | Administrative & support | 2025 |
| Keystone Group Wash & Wipe Cleaners Ltd | Administrative & support | 2025 |
| KFS Dewsbury Ltd | Hospitality | 2023 |
| KG 16 Limited | Real estate | 2022 |
| KGR Heating Ltd | Construction | 2021 |
| Khan & Zain Ltd | Wholesale & retail | 2025 |
| Khan Couriers UK Ltd | Transport & logistics | 2024 |
| Khan Health Resources Limited | Administrative & support | 2014 |
| Khan Property Management Limited | Real estate | 2016 |
| KHANN5 Ltd | Wholesale & retail | 2025 |
| Khanz Holdings Ltd | Wholesale & retail | 2021 |
| Kharshy Group Ltd | Transport & logistics | 2026 |
| Khaur City Ltd | Wholesale & retail | 2023 |
| Khazana Foods Ltd | Manufacturing | 2026 |
| KHJ Equine Ltd | Agriculture & fishing | 2026 |
| KHM Trading Limited | Other services | 2025 |
| Khushi Traders Ltd | Wholesale & retail | 2025 |
| Kidcol Limited | Wholesale & retail | 2024 |
| Kiddies Kingdom Ltd | Wholesale & retail | 2008 |
| Kingcraft Roofing and Cladding Ltd | Construction | 2025 |
| Kingfisher HR Consultants Ltd | Professional & scientific | 2018 |
| Kingsbury Banqueting Limited | Other services | 2016 |
| Kingsbury Cuisine Limited | Hospitality | 2016 |
| Kirklees Citizens Advice and Law Centre | Other services | 2001 |
| Kirklees LMC Limited | Health & social care | 2025 |
| Kirklees Motor Co. Ltd | Wholesale & retail | 2019 |
| Kirklees Wheelie BIN Cleaners Ltd | Other services | 2016 |
| Kirklees Women Rising Empower-Her C.I.C. | Education | 2025 |
| Kirkstall Dent Ltd | Health & social care | 2023 |
| Kiscan Solutions Ltd | Transport & logistics | 2024 |
| Kismats (Yorkshire) Ltd | Health & social care | 2020 |
| Kiss Property Solutions Ltd | Real estate | 2017 |
| Kiswatalkaaba Ltd | Arts & recreation | 2024 |
| Kitch Enterprises Ltd | Professional & scientific | 2021 |
| Kiwi Enterprises Limited | Wholesale & retail | 2019 |
| Kiwipand Limited | Wholesale & retail | 2025 |
| KJ Autos Limited | Wholesale & retail | 2025 |
| KJ Fresh Ltd | Wholesale & retail | 2023 |