| Johnston Energy Ltd | Construction | 2015 |
| Jolly Antiques Limited | Wholesale & retail | 2020 |
| Josh's Indian Kitchen Ltd | Hospitality | 2019 |
| Joyful Core Limited | Transport & logistics | 2025 |
| JPD Construction Ltd | Construction | 2016 |
| JRA Investments Limited | Hospitality | 2019 |
| Jrehman Enterprises Ltd | Hospitality | 2023 |
| JRS Enterprises Ltd | Real estate | 2025 |
| JS Marsh Limited | Wholesale & retail | 2016 |
| JS Trading (SPP) Limited | Wholesale & retail | 2017 |
| JSC Adapted Stays Ltd | Hospitality | 2022 |
| Jshsolars Ltd | Energy | 2025 |
| JT Creative Ltd | Professional & scientific | 2021 |
| JT Technical Services Ltd | Professional & scientific | 2020 |
| Julia Hair Salon Ltd | Other services | 2024 |
| Junkey Soul Store Limited | Wholesale & retail | 2025 |
| Jupiter Contracts Limited | Real estate | 2010 |
| Jurassic Sparks (Southern) Ltd | Manufacturing | 2014 |
| Just Glass Recycling Limited | Water & waste | 2020 |
| Just Noodles Limited | Hospitality | 2010 |
| JVT Cleaning Ltd | Administrative & support | 2022 |
| JWJ Pubs Limited | Hospitality | 2014 |
| JWS Management Investments Ltd | Real estate | 2025 |
| JZ Property Group Ltd | Construction | 2018 |
| K & J Motors Ltd | Wholesale & retail | 2024 |
| K Hang Property Ltd | Hospitality | 2017 |
| K M Oral Care Ltd | Health & social care | 2022 |
| K P Z Developments Ltd | Real estate | 2026 |
| K V Pest Control Limited | Construction | 2023 |
| K&Tt Trading Limited | Wholesale & retail | 2025 |
| K-Uk Plant International Ltd | Wholesale & retail | 2011 |
| KA Education Limited | Education | 2015 |
| Kabuki Productions Limited | Information & communication | 2007 |
| Kaizen Food & Drink Limited | Hospitality | 2018 |
| Kalvotech Limited | Professional & scientific | 2023 |
| Kamadent Limited | Health & social care | 2024 |
| Kamara Tax Ltd | Professional & scientific | 2026 |
| Kamona Limited | Hospitality | 2024 |
| Kanan Security Ltd | Administrative & support | 2022 |
| Karakoti Consulting Limited | Professional & scientific | 2025 |
| Karen George Limited | Wholesale & retail | 2016 |
| Kargo X Ltd | Transport & logistics | 2026 |
| Karthiga Therapy Services Limited | Professional & scientific | 2023 |
| Kashmir Southsea Ltd | Hospitality | 2016 |
| Kasjibola Ltd | Professional & scientific | 2025 |
| Kate Jenkins EP Services Limited | Education | 2023 |
| KCO Supplies Ltd | Wholesale & retail | 2025 |
| KCS Consulting Limited | Professional & scientific | 2010 |
| Kebabs to Go Ltd | Hospitality | 2018 |
| Kebes Ltd | Hospitality | 2016 |
| Kedy Ltd | Hospitality | 2020 |
| Keeping Mechanical Services Ltd | Construction | 2021 |
| Kelso Property Investments Limited | Real estate | 2005 |
| Kempter Limited | Extraterritorial | 2015 |
| Kens Chicken Southsea Ltd | Hospitality | 2013 |
| Kens Express Limited | Extraterritorial | 2024 |
| Kerr Geoscience Ltd | Professional & scientific | 2021 |
| Kesselbrenner Limited | Professional & scientific | 2017 |
| Key Pillar AI Ltd | Wholesale & retail | 2025 |
| Khawar Butt Ltd | Wholesale & retail | 2026 |
| Khizer Sharif Ltd | Wholesale & retail | 2023 |
| Khqm Property Ltd | Real estate | 2025 |
| Kids Golf Limited | Wholesale & retail | 2025 |
| Kinetic Academy of Dance and Fitness Ltd | Arts & recreation | 2017 |
| King Holdings Group Limited | Administrative & support | 2019 |
| Kings House (Kings Road) RTM Company Limited | Hospitality | 2012 |
| Kings Theatre Enterprises Limited | Arts & recreation | 2025 |
| Kings Theatre Productions Limited | Arts & recreation | 2025 |
| Kingston House Ltd | Real estate | 2025 |
| Kino Kult CIC | Arts & recreation | 2023 |
| KIR Property Group Ltd | Real estate | 2024 |
| Kirpal Ltd | Real estate | 2021 |
| Kitchen & Leader Ltd | Real estate | 2017 |
| Kkbarbering Ltd | Other services | 2023 |
| KKD Trading Limited | Hospitality | 2024 |
| KL & MT Hutton Limited | Professional & scientific | 2026 |
| KMN Ltd | Wholesale & retail | 2023 |
| Knight and SON (South) Ltd | Construction | 2014 |
| Knight Moon Curio Ltd | Wholesale & retail | 2021 |
| Knoghes Limited | Health & social care | 2021 |
| KONSOLID8 Holdings Ltd | Other services | 2026 |
| Kosmo Box Ltd | Wholesale & retail | 2025 |
| Krevana Ltd | Wholesale & retail | 2024 |
| Krishna Food and Cafe Ltd | Hospitality | 2026 |
| KSS Staffing Services Ltd | Administrative & support | 2020 |
| Kuku at the Parlour Ltd | Hospitality | 2017 |
| L D Jenner Ltd | Construction | 2026 |
| L D Zaev Limited | Transport & logistics | 2022 |
| L Ferron Limited | Professional & scientific | 2014 |
| L J Secker Ltd | Professional & scientific | 2024 |
| L K Plastering & Building Ltd | Extraterritorial | 2020 |
| L W Roofing (South) Ltd | Construction | 2021 |
| L&B Decorating Ltd | Construction | 2022 |
| L. S. Imports Limited | Wholesale & retail | 1995 |
| LA Croissanterie Limited | Wholesale & retail | 2002 |
| LA Diva Hair Salon Ltd | Other services | 2024 |
| Lady Luck Tattoo Studio Ltd | Other services | 2015 |
| Laflash & Co Ltd | Other services | 2026 |
| Lairy Media Limited | Wholesale & retail | 2026 |
| Lake House Freehold Limited | Households | 2017 |