| High Road Lettings Ltd | Real estate | 2023 |
| Hill & Field Limited | Professional & scientific | 2018 |
| Hj&M Property Management Ltd | Real estate | 2015 |
| HJB Plumbing Services Limited | Construction | 2025 |
| HJS Recovery Services Ltd | Transport & logistics | 2025 |
| Hollybush Buildings Ltd | Administrative & support | 2006 |
| Home Retail Distribution Ltd | Wholesale & retail | 2024 |
| Hoplite Cyber Ltd | Information & communication | 2026 |
| Horizon West Ltd | Real estate | 2026 |
| Hot Tasty Flavor Limited | Hospitality | 2022 |
| Howgate Partnership LLP | | 2024 |
| Howling Houndz Ltd | Wholesale & retail | 2026 |
| HS & BK Limited | Wholesale & retail | 2021 |
| Hurrell Shipping (Thames) Limited | Transport & logistics | 2015 |
| Hydrogen Plant Hire Limited | Manufacturing | 2020 |
| Hydrogen Plant Services Limited | Manufacturing | 2020 |
| I R Cumming Ltd | Health & social care | 2010 |
| I.S.L.A. Electrical Ltd | Construction | 2011 |
| ID Scaffolding Ltd | Construction | 2017 |
| IMMERSIVE3D Limited | Manufacturing | 2016 |
| Industrial Pipe Services Ltd | Professional & scientific | 2021 |
| Infusion Leasing Ltd | Real estate | 2024 |
| INK & Bloom Clinic Ltd | Health & social care | 2025 |
| Innet Limited | Information & communication | 1996 |
| Innovation Design & Build Ltd | Real estate | 2014 |
| Inspire Recruitment Limited | Administrative & support | 2025 |
| Intrigue Cosmetic Clinic Limited | Health & social care | 2016 |
| Intrigue Lifestyle Limited | Wholesale & retail | 2021 |
| Invicta Business Mentors Limited | Professional & scientific | 2005 |
| Invicta Digital Ltd | Professional & scientific | 2021 |
| Invicta Groundcare Equipment Limited | Manufacturing | 2008 |
| Invicta Keystone Limited | Real estate | 2018 |
| IW Health Group Ltd | Health & social care | 2023 |
| IWS Property Ltd | Real estate | 2024 |
| J & J Associates (South East) Limited | Professional & scientific | 1998 |
| J & K Solutions (2023) Limited | Professional & scientific | 2023 |
| J & R Care Limited | Education | 2002 |
| J & T Tech Limited | Information & communication | 2017 |
| J B Property Ltd | Real estate | 2012 |
| J H Builders (UK) Limited | Construction | 2003 |
| J K P Transport Limited | Transport & logistics | 2003 |
| J Keegan Limited | Real estate | 2017 |
| J Keegan Trading Limited | Professional & scientific | 2022 |
| J Marketing Ltd | Professional & scientific | 2018 |
| J Starc 2 Limited | Construction | 2019 |
| J Taylor Associates Ltd | Real estate | 2015 |
| Jacomb's Carpentry Ltd | Construction | 2017 |
| JAI Anjaneya Limited | Information & communication | 2018 |
| Janice Hill Hair Design Limited | Other services | 2003 |
| JB Airconditioning Services Ltd | Energy | 2005 |
| JB Vinyl Installations Limited | Construction | 2022 |
| JCB Power Solutions Ltd | Professional & scientific | 2021 |
| JCM Retail Consulting Limited | Professional & scientific | 2006 |
| JD Properties London Ltd | Real estate | 2022 |
| JDM Estates Ltd | Real estate | 2008 |
| JDM Estates Southern Ltd | Real estate | 2021 |
| JDR Independent Services Ltd | Information & communication | 2025 |
| JDW Cleaning Ltd | Administrative & support | 2016 |
| Jeff Allen Designer Kitchens Ltd | Wholesale & retail | 2019 |
| Jelicoe House Management (Beckenham) Limited | Households | 2002 |
| JF Immersive Ltd | Professional & scientific | 2025 |
| JGC Retail Ltd | Wholesale & retail | 2019 |
| JJH Surveying Limited | Professional & scientific | 2016 |
| JJM Electrical Services Limited | Construction | 2018 |
| JK Avenir Estates Limited | Real estate | 2019 |
| JL Enterprises (2017) Limited | Hospitality | 2017 |
| JMC Building Maintenance Ltd | Professional & scientific | 2025 |
| Joamre Limited | Financial services | 2019 |
| Johal Construction Limited | Construction | 2001 |
| JPM Consulting Limited | Professional & scientific | 2021 |
| JRH Mechanical Ltd | Construction | 2026 |
| JSB Mini Diggers Ltd | Construction | 2006 |
| JTS Resins Limited | Construction | 2024 |
| Jules B Photography Ltd | Professional & scientific | 2014 |
| JWJ Landscaping Services Limited | Administrative & support | 2018 |
| Kadodo Games Ltd | Professional & scientific | 2025 |
| Karabardak Consulting Limited | Information & communication | 1997 |
| KBN Travel Ltd | Administrative & support | 2024 |
| KBS Builders Merchants Ltd | Wholesale & retail | 2010 |
| Keddy Family Investments Limited | Real estate | 2021 |
| Keerat Consulting Ltd | Administrative & support | 2024 |
| Kent & Surrey Building Services Limited | Construction | 2022 |
| Kent Access Ltd | Construction | 2025 |
| Kent Exterior Cleaning Ltd | Administrative & support | 2026 |
| Kent Hair Ltd | Other services | 2024 |
| Kent Pro Estates Ltd | Real estate | 2021 |
| Kentish Fare Ltd | Manufacturing | 2025 |
| Kesresrob Prop Co Ltd. | Wholesale & retail | 2019 |
| Kess Supplies Limited | Administrative & support | 2022 |
| Kevin Field Carpentry & Building Services Ltd | Construction | 2016 |
| Key 2 Fitness Limited | Education | 2014 |
| KIM and Pete Holdings Ltd | Real estate | 2021 |
| King and Kindness Ltd | Households | 2025 |
| Kkaa Engineering Limited | Wholesale & retail | 2025 |
| KKB Box Land Ltd | Financial services | 2026 |
| KKB Box Opco Ltd | Financial services | 2026 |
| KKB Prop Co Limited | Real estate | 2017 |
| KMD Financial Holding Ltd | Financial services | 2024 |
| Knight Sword Publication Ltd | Information & communication | 2025 |
| KRR Basico Ltd | Financial services | 2016 |