| Hill House Holdings Limited | Real estate | 2018 |
| Hill House Lodge Limited | Real estate | 2018 |
| Hill House Property Limited | Real estate | 2017 |
| Hire Plant Ltd. | Extraterritorial | 2011 |
| HJ Gentlemen Limited | Other services | 2017 |
| HJ Weald Ltd | Households | 2025 |
| HJG Lewes Limited | Other services | 2019 |
| Hjvfx Limited | Construction | 2016 |
| HM Motives Ltd | Wholesale & retail | 2022 |
| Hmtw Auto Services Ltd | Wholesale & retail | 2025 |
| Hoathly Hill Association Limited | Real estate | 1986 |
| Hoathly Hill Renewable Energy Ltd | Professional & scientific | 2005 |
| Hoathly Hill Trust Ltd | Real estate | 1995 |
| Hockin Studio Ltd | Wholesale & retail | 2014 |
| Hockley Enterprises Limited | Extraterritorial | 2014 |
| Hockley Wright & Co Limited | Professional & scientific | 2003 |
| Hockley Wright & Sons Limited | Extraterritorial | 2007 |
| Hockley Wright Affiliates Limited | Professional & scientific | 2006 |
| Holden Close Ltd | Real estate | 2020 |
| Holdfield Group (NO.2) Limited | Financial services | 2004 |
| Holland Partners Ltd | Information & communication | 2013 |
| Holloway Management Company (Kidwelly) Limited | Households | 2004 |
| Holly Tree Surgeons Limited | Agriculture & fishing | 1999 |
| Holman Holdings Limited | Financial services | 2015 |
| Holman Managed Syndicates Limited | Financial services | 1992 |
| Holtye Ltd | Construction | 2017 |
| Holtye Road Management Company Limited | Households | 2002 |
| Holtye Windows Ltd | Construction | 2013 |
| Home Letting Solutions Limited | Real estate | 2017 |
| Home Platt Residents Association Limited | Other services | 2011 |
| Homelium Ltd | Financial services | 2023 |
| Homesmartt Ltd | Construction | 2023 |
| Homeware Microbrands Ltd | Wholesale & retail | 2022 |
| Horizons New Publishing Ltd | Information & communication | 2011 |
| Horsted Keynes LLP | | 2016 |
| Horsted Keynes Property Limited | Professional & scientific | 2016 |
| Horsted Keynes Property NO.2 Limited | Real estate | 2016 |
| Hosted Communications Limited | Construction | 2021 |
| Hotelster Ltd | Hospitality | 2026 |
| House of MAX Ltd | Real estate | 2024 |
| Howe Heritage Construction Ltd | Construction | 2025 |
| HR by HR Ltd | Administrative & support | 2024 |
| HTE Contractors Ltd | Construction | 2020 |
| HTZ Limited | Manufacturing | 2006 |
| Hugewing Limited | Administrative & support | 1987 |
| Hughes Bespoke Ltd | Construction | 2021 |
| Hukilau Ltd | Professional & scientific | 2024 |
| Hummingbird Paper Co Limited | Wholesale & retail | 2025 |
| Hungarian Show Production Ltd | Hospitality | 2024 |
| Hungry Communications Limited | Professional & scientific | 2012 |
| Hunters Property Investment Limited | Real estate | 2005 |
| Hush Yoga Limited | Arts & recreation | 2021 |
| HUW Alan Limited | Professional & scientific | 2017 |
| Hwfe Ltd | Water & waste | 2024 |
| Hydroskin Decorative Surfaces Ltd | Wholesale & retail | 2026 |
| Hyett Developments Limited | Real estate | 2024 |
| Hyline Designs Ltd | Arts & recreation | 2020 |
| Hyper Creative Ltd | Manufacturing | 2022 |
| Hyper Scale Marketing Ltd | Professional & scientific | 2026 |
| I & S Partners Ltd | Real estate | 2019 |
| I AM Remi Ltd | Professional & scientific | 2018 |
| I Book Ltd | Professional & scientific | 2011 |
| I R Lacey Plumbing & Heating Limited | Construction | 2008 |
| I Supported Ltd | Information & communication | 2020 |
| I-Care Optometry Ltd | Health & social care | 2008 |
| I.T. Proven Solutions Limited | Information & communication | 1997 |
| IAN Hiscock Consulting Limited | Professional & scientific | 2021 |
| IAO Advisory Services Ltd | Professional & scientific | 2022 |
| Ice Design Solutions Limited | Professional & scientific | 2004 |
| Iceni Music Ltd | Other services | 2015 |
| Ideally Ltd | Wholesale & retail | 2021 |
| Ideation Creation Ltd | Other services | 2020 |
| Identify Services Ltd | Construction | 2019 |
| Idesso Ltd | Professional & scientific | 2014 |
| Idris Consulting Limited | Professional & scientific | 2019 |
| Igence Limited | Information & communication | 2003 |
| Igence Software Limited | Administrative & support | 1999 |
| Imberhorne 4X4 Ltd | Wholesale & retail | 2016 |
| Imberhorne Electrical Services Limited | Construction | 2019 |
| Imberhorne Holdings Limited | Professional & scientific | 2021 |
| Imberhorne Lane Nursery Plant Centre Ltd | Agriculture & fishing | 2018 |
| Imcm Limited | Information & communication | 2012 |
| Imfundo Advisory Services Ltd | Professional & scientific | 2022 |
| Immersion Games Ltd | Arts & recreation | 2023 |
| Impactonomix Ltd | Information & communication | 2024 |
| Impluvium Consulting Ltd. | Information & communication | 2013 |
| Import-Export Pallets Boxes & Cradles Ltd | Wholesale & retail | 2016 |
| IN the Event Productions Ltd | Arts & recreation | 2022 |
| In-Line Safety Limited | Professional & scientific | 2004 |
| Indata Solutions Limited | Administrative & support | 2001 |
| Indispensable Export Import Ltd | Wholesale & retail | 2025 |
| Industry Take Ltd | Professional & scientific | 2024 |
| Inflight Catering Ltd | Hospitality | 2024 |
| Infobay Group Ltd | Information & communication | 2016 |
| Inform Network Limited | Administrative & support | 2018 |
| Ingetech Limited | Professional & scientific | 2026 |
| INK Casting Limited | Arts & recreation | 2015 |
| Innovative Trade Solution Ltd | Construction | 2025 |
| Inside Edge Media Training Limited | Professional & scientific | 2011 |
| Insight Information International Ltd | Professional & scientific | 2026 |