| Hectors Limited | Professional & scientific | 2004 |
| Helia Trading Limited | Real estate | 2017 |
| Hemingford Limited | Construction | 1993 |
| Hetairoi Ltd | Administrative & support | 2024 |
| HEX D Limited | Information & communication | 2018 |
| HEY Deal Limited | Hospitality | 2026 |
| HEY Delicious Limited | Hospitality | 2019 |
| HEY HEY Holding Limited | Real estate | 2019 |
| HEY Street Food Limited | Wholesale & retail | 2021 |
| Heythorp Productions Ltd | Administrative & support | 2016 |
| HG PUB Co Ltd | Extraterritorial | 2016 |
| HH Ballet Academy Ltd | Arts & recreation | 2016 |
| Higgssibs Limited | Households | 2025 |
| Highway Auto Centre Ltd | Wholesale & retail | 2021 |
| Higson & Co (Deal) Ltd | Professional & scientific | 2022 |
| Hillside Farm Estates Limited | Construction | 2008 |
| HOG & Bean Ltd | Hospitality | 2018 |
| HOG on the Run Ltd | Hospitality | 2021 |
| Hogben's Private Water Supplies Limited | Construction | 2013 |
| Hold Point Ltd | Wholesale & retail | 2025 |
| Holland Homes and Interiors Ltd | Real estate | 2022 |
| Homesbaragainstore Ltd | Manufacturing | 2025 |
| Homeshores Limited | Professional & scientific | 1980 |
| Hoptow Limited | Construction | 2024 |
| Horizon Developments (South East) Ltd | Construction | 2026 |
| Horizon Q8 Limited | Real estate | 2011 |
| Houghtonbudd Architects Limited | Professional & scientific | 2005 |
| House of Black Design Limited | Professional & scientific | 2025 |
| Household Money Saving Limited | Information & communication | 2023 |
| Housemartins Homes Ltd | Real estate | 2025 |
| Howell & Hicks Creative Ltd | Professional & scientific | 2016 |
| Howfield Wood Amenity Land Company Limited | Arts & recreation | 2012 |
| HRK Mortgages Ltd | Financial services | 2018 |
| HSE Advisor Limited | Construction | 2006 |
| HSW Solutions Limited | Professional & scientific | 2012 |
| HTF Valves & Piping Supplies Limited | Wholesale & retail | 2019 |
| Hugo & Green Ltd | Wholesale & retail | 2022 |
| Humain Technology Ltd | Information & communication | 2022 |
| Huntsland Properties Limited | Construction | 2009 |
| Hurbal Ltd | Other services | 2026 |
| HUT 55 Limited | Hospitality | 2018 |
| Hutson Property Investment Ltd | Real estate | 2017 |
| Hyton & Grantham Group Ltd | Real estate | 2026 |
| I-Deal Security Crew Ltd | Administrative & support | 2025 |
| IAN Pitcher & Sons Transport Ltd | Transport & logistics | 2018 |
| IB Barbers Limited | Other services | 2020 |
| Icoastconsult Ltd | Professional & scientific | 2023 |
| ICY HOG Parlour Ltd | Hospitality | 2022 |
| IDE Electric Ltd | Wholesale & retail | 2026 |
| Ideal 4 U Insurance Services Limited | Financial services | 2012 |
| Ilunit Limited | Wholesale & retail | 2015 |
| Impacthrd Community Interest Company | Professional & scientific | 2025 |
| IN Tune Marketing Limited | Professional & scientific | 2020 |
| Inclusive Care Installations Limited | Construction | 2025 |
| Inclusive Care Solutions Limited | Construction | 2020 |
| Inspire Minds Counselling Ltd | Education | 2025 |
| Intercrop Group Limited | Professional & scientific | 2002 |
| Intercrop Holdings Limited | Financial services | 2006 |
| Intercrop Limited | Agriculture & fishing | 1991 |
| Intercrop Plants Limited | Extraterritorial | 2003 |
| International Safety*Quality*Environment*Management*Association | Administrative & support | 2008 |
| Invicta Beach Club Ltd | Manufacturing | 2025 |
| IP Supplies Consulting Ltd | Professional & scientific | 2022 |
| Ironing Angels & Launderama Limited | Wholesale & retail | 2009 |
| ISM Land Consultancy Limited | Water & waste | 2012 |
| IT Trade Link Limited | Professional & scientific | 2001 |
| Itechprof Private Limited | Information & communication | 2009 |
| J & T Heating Ltd | Construction | 2014 |
| J D Griggs Plumbing Ltd | Construction | 2023 |
| J Dilnot-Smith Limited | Other services | 2003 |
| J L Fisheries Limited | Agriculture & fishing | 2014 |
| J W W Collections Limited | Administrative & support | 2017 |
| J&J Accountants and Tax Advisors Ltd | Professional & scientific | 2015 |
| J. Cosmo Limited | Wholesale & retail | 2015 |
| J.Moon Electrical Ltd | Construction | 2025 |
| JAB JAB House Ltd | Education | 2026 |
| Jack and Eileen Aisher Trust Limited | Administrative & support | 1972 |
| Jackson East Property Limited | Households | 2026 |
| Jackson Merrick Designs Ltd | Construction | 2021 |
| Jackson Morgenstern Design Limited | Other services | 2012 |
| Jacr Property Limited | Real estate | 2014 |
| Jamc Holdings Limited | Professional & scientific | 2020 |
| James & SON Hearing Limited | Health & social care | 2016 |
| James Armstrong Contractors Limited | Construction | 1995 |
| James Easton Ltd. | Professional & scientific | 2014 |
| Jamesbros Construction Ltd | Construction | 2024 |
| Jameschef Limited | Hospitality | 2019 |
| Jamie Lane Ltd | Information & communication | 2006 |
| Janaway Creative Ltd | Information & communication | 2022 |
| Jane Patrick Property Ltd | Real estate | 2018 |
| Jared Newell Consulting Ltd | Professional & scientific | 2019 |
| Jarvie Investing Limited | Real estate | 2021 |
| Jaspeo Property Limited | Real estate | 2019 |
| Jaxx Global Limited | Arts & recreation | 2020 |
| JB Electrical Kent Ltd | Construction | 2023 |
| JBE Deal Limited | Real estate | 2024 |
| JDS HR Limited | Professional & scientific | 2008 |
| Jenkins Consultancy Limited | Professional & scientific | 2024 |
| Jenner Mortgage Solutions Limited | Financial services | 2024 |
| JFP (Essex) Ltd | Hospitality | 2025 |