| Hermitage Collection Limited | Wholesale & retail | 2006 |
| Hesperus Ecology Limited | Professional & scientific | 1998 |
| HG Crowborough Limited | Other services | 2019 |
| Hibberd Product Design Ltd | Professional & scientific | 2026 |
| Higgins Estate Management Ltd | Real estate | 2025 |
| Higgins Scaffolding Ltd | Construction | 2018 |
| High Sussex Residents Association Limited | Households | 1987 |
| Highclere Holdings Ltd | Financial services | 2019 |
| Highlands Court Residents Association (Crowborough) Limited | Professional & scientific | 1974 |
| Hill Financial Services (UK) Limited | Financial services | 2007 |
| Hillarys Coachworks Limited | Wholesale & retail | 2005 |
| Hillswood (Blackness Road) Management Company Limited | Real estate | 2011 |
| Hitech Aesthetics Ltd | Other services | 2021 |
| HMB Bathrooms Limited | Construction | 2025 |
| Hobson Chase Limited | Professional & scientific | 2026 |
| Hodge Landscapes Limited | Construction | 2006 |
| Holiday Park Homes Ltd | Hospitality | 2025 |
| Holts Property Solutions Limited | Construction | 2022 |
| Home Counties Swimming Pools Limited | Construction | 2000 |
| Home Decor London Ltd | Wholesale & retail | 2018 |
| Home Farm Stables Ltd | Agriculture & fishing | 2026 |
| Homelife Care Limited | Health & social care | 2003 |
| Homesack Limited | Construction | 1975 |
| Homestar Security Limited | Administrative & support | 2011 |
| Hope Way Properties Limited | Real estate | 1997 |
| Horder MSK Limited | Health & social care | 2014 |
| Hot Tramp Ltd | Households | 2021 |
| House 1.12 Yoophuket Limited | Professional & scientific | 2011 |
| House and Gardenproud Limited | Extraterritorial | 2008 |
| HPS Build Limited | Construction | 2019 |
| HR Motocross Limited | Wholesale & retail | 2024 |
| HRM Project Services Ltd | Professional & scientific | 1994 |
| HSJ Consult Limited | Professional & scientific | 2015 |
| Hughes Food Enterprises Limited | Hospitality | 2001 |
| Human Capital Valuation Ltd | Information & communication | 2007 |
| Hurst Farm Management Limited | Extraterritorial | 1997 |
| Hurtis Hill Services Limited | Professional & scientific | 2012 |
| Hussain Duke Consulting Limited | Professional & scientific | 2021 |
| Hutch Retail Ltd. | Wholesale & retail | 2022 |
| Hvps Limited | Information & communication | 2002 |
| I C T Network Services Ltd | Information & communication | 2006 |
| I O W Leisure Ltd | Real estate | 2012 |
| Icanhandy-Man Ltd | Households | 2020 |
| Icon Cleaning Services Limited | Extraterritorial | 2012 |
| Icon Digital Limited | Information & communication | 2021 |
| Icon Global Mobility Ltd | Extraterritorial | 2019 |
| Icon Moving Services Limited | Administrative & support | 2010 |
| Icon Relocation Asia Limited | Other services | 2021 |
| Icon Relocation Limited | Administrative & support | 2001 |
| Ides Global Limited | Professional & scientific | 2014 |
| Ierette Co Limited | Professional & scientific | 2011 |
| IMI Law Consultancy Limited | Professional & scientific | 2018 |
| Imperium Lighting Ltd | Wholesale & retail | 2021 |
| IN the Loop Drinks Ltd | Manufacturing | 2019 |
| Inacio Limited | Hospitality | 2003 |
| INAYA24 Limited | Wholesale & retail | 2024 |
| Indeparent Limited | Information & communication | 2025 |
| Ined Group Ltd | Information & communication | 2025 |
| Infinite Yoga Ltd | Administrative & support | 2016 |
| Inflatable Aardvark Ltd | Construction | 2025 |
| Innervate Consultancy Ltd | Professional & scientific | 2016 |
| Innovation Interni Limited | Wholesale & retail | 2018 |
| Insight Berkshire Ltd. | Health & social care | 2014 |
| Intarso UK Ltd. | Professional & scientific | 2016 |
| Intelligent Outsourcing Ltd. | Administrative & support | 2016 |
| Interactivesquashuk Ltd | Education | 2021 |
| Interfuture Holdings Limited | Financial services | 2023 |
| INX Digital Assets UK Limited | Information & communication | 2018 |
| IPT Fitness Limited | Arts & recreation | 2013 |
| Ironeye Ltd | Professional & scientific | 2026 |
| Isotope Watches Limited | Wholesale & retail | 2013 |
| Ivison Hawke Ltd | Information & communication | 2012 |
| IVY IT Solutions Limited | Information & communication | 2015 |
| IVY New Homes Limited | Real estate | 2023 |
| IW Book - Keeping Limited | Professional & scientific | 2003 |
| Iyengar Yoga (UK) Ltd | Other services | 2011 |
| J a Harbidge Ltd | Professional & scientific | 2022 |
| J G T Tribe Limited | Wholesale & retail | 2014 |
| J Lunnon & SON Limited | Professional & scientific | 2001 |
| J M Skinner Ltd | Professional & scientific | 2024 |
| J Matthews Legal Ltd | Administrative & support | 2017 |
| J&Pb Management Limited | Real estate | 2011 |
| J.C.M.L. Consultancy Ltd | Professional & scientific | 2008 |
| J.Jordan's Heating Limited | Construction | 2026 |
| JAC Ventures Limited | Professional & scientific | 2016 |
| Jacara Publishing Ltd | Information & communication | 2025 |
| Jacks Vans Limited | Transport & logistics | 2021 |
| Jackson Financial Planning Limited | Financial services | 1984 |
| Jackson Rowe Advisory Ltd | Professional & scientific | 2016 |
| Jackson Rowe Associates Ltd | Professional & scientific | 2006 |
| Jackson Rowe Employment & Skills Ltd | Professional & scientific | 2017 |
| Jackson Rowe Holdings Limited | Professional & scientific | 2024 |
| Jackson Rowe Limited | Financial services | 2019 |
| Jadr Consulting Ltd | Professional & scientific | 2023 |
| JAF Data Solutions Ltd | Professional & scientific | 2022 |
| James French Aviation Services Ltd | Transport & logistics | 2022 |
| James Willis Services Ltd | Professional & scientific | 2019 |
| Jardine Properties Ltd | Real estate | 2024 |
| JAY Hanuman Ltd | Wholesale & retail | 2018 |
| JAY JAY Hanuman Limited | Real estate | 2024 |