| Hammarlund SIM Investment Ltd | Real estate | 2023 |
| Hancock Wealth Management Ltd | Financial services | 2022 |
| Hand and Wrist Specialist Ltd | Health & social care | 2020 |
| Handy Talents Ltd | Construction | 2023 |
| HAO HAO Property Ltd | Real estate | 2016 |
| Happinest Homes Ltd | Financial services | 2021 |
| Happybusiness Limited | Administrative & support | 2016 |
| Hardy's Smart Repairs Ltd | Wholesale & retail | 2026 |
| Harlsey Developments Limited | Real estate | 2020 |
| Harlsey Investments Limited | Financial services | 2022 |
| Harlsey Portfolio Limited | Real estate | 2022 |
| Harmanpharma Limited | Professional & scientific | 2024 |
| Harrington Flat Roofing Specialist Limited | Construction | 2007 |
| Harris Health Ltd | Health & social care | 2018 |
| Harrison Accommodations Ltd | Real estate | 2024 |
| Harwood Pharma GMP Consulting Limited | Professional & scientific | 2022 |
| Hawkins Ventures Ltd | Real estate | 2022 |
| Hazard 360 Ltd. | Professional & scientific | 2013 |
| Head Heritage Limited | Wholesale & retail | 1996 |
| Headless Turkey Productions Ltd | Information & communication | 2022 |
| Healthier, Fitter YOU Limited | Arts & recreation | 2024 |
| Hema Consulting Limited | Professional & scientific | 2013 |
| Hemming Developments Ltd | Construction | 2024 |
| Hexagon Maintenance Limited | Construction | 2010 |
| High Penn Car Sales Ltd | Wholesale & retail | 2020 |
| High Penn Management Company Limited | Real estate | 2005 |
| High Street Barbers Ltd | Other services | 2011 |
| Highway Hill Limited | Real estate | 2015 |
| Hilda Investments Ltd | Real estate | 2024 |
| Hiremart Global Ltd | Professional & scientific | 2021 |
| Hobsons Holdings Limited | Administrative & support | 2007 |
| Holtech Ec&I Engineering Ltd | Professional & scientific | 2023 |
| Holtech Group Ltd | Manufacturing | 2011 |
| Holy Trinity Church of England Academy | Education | 2012 |
| Home Inspirations Limited | Construction | 2006 |
| Home Masters 247 Holdings Ltd | Financial services | 2026 |
| Home Masters 247 Ltd | Real estate | 2026 |
| Homegleamers Ltd | Other services | 2006 |
| Homely Management Ltd | Real estate | 2021 |
| Homerise Stairlifts Limited | Extraterritorial | 2024 |
| Hommee Ltd | Professional & scientific | 2024 |
| Horizons Counselling Ltd | Health & social care | 2023 |
| House & Co. Properties Ltd | Real estate | 2020 |
| House Family Finance Ltd | Extraterritorial | 2016 |
| House of Aphrodite Limited | Extraterritorial | 2024 |
| House of Vision Ltd | Real estate | 2024 |
| HPD Property Investments Ltd | Real estate | 2020 |
| Hubro Insight Ltd | Information & communication | 2025 |
| Huginn Services Limited | Real estate | 2017 |
| Hugo Publishing House Ltd | Information & communication | 2024 |
| Huhar Consultancy Associates Limited | Information & communication | 2017 |
| Hurtwood Limited | Other services | 2001 |
| HXH Properties Ltd | Real estate | 2026 |
| Hyggee Houses Ltd | Hospitality | 2020 |
| I Hate Everything Ltd | Information & communication | 2017 |
| I Love Nails (Wiltshire) Limited | Other services | 2015 |
| Iain Morgan Installations Ltd | Manufacturing | 2015 |
| Iaja Kamasa Ltd | Financial services | 2023 |
| IAM Zero Carbon Ltd | Extraterritorial | 2010 |
| Iany Ltd | Construction | 2025 |
| IBP Recruitment Ltd | Administrative & support | 2015 |
| Ictinus Group Ltd | Financial services | 2026 |
| Ictinus Living Ltd | Real estate | 2026 |
| Idolum Design Resource Limited | Professional & scientific | 2001 |
| ILA Direct Ltd | Professional & scientific | 2020 |
| Ilic Mcfarlane Investment Group Limited | Financial services | 2024 |
| Ilic Mcfarlane Property Trading Ltd | Real estate | 2023 |
| Imbali Ltd | Wholesale & retail | 2020 |
| Impact Property Solutions Ltd | Construction | 2024 |
| Infrabass Ltd | Wholesale & retail | 2019 |
| Innoverse Ltd | Information & communication | 2021 |
| Inspired Leadership Solutions Ltd | Professional & scientific | 2021 |
| Intego Property Ltd | Real estate | 2021 |
| Integrated Electrical Security Ltd | Construction | 2015 |
| Investments Holdings Ltd | Real estate | 2023 |
| Inveztough Limited | Professional & scientific | 2021 |
| IP Advice Ltd | Professional & scientific | 2019 |
| IR35 Advice Ltd | Professional & scientific | 2023 |
| IR35 Tax Advice Ltd | Professional & scientific | 2018 |
| Ironsaxon Digital Ltd | Information & communication | 2026 |
| Isbourne Facilities Ltd | Households | 2024 |
| Isola MT Holdings Ltd | Real estate | 2023 |
| Isometrica Ltd | Professional & scientific | 2010 |
| Ivet (UK) Ltd | Professional & scientific | 2005 |
| J and R Living and Letting Limited | Real estate | 2025 |
| J H a Flips Limited | Real estate | 2025 |
| J R Angell Farming Ltd | Agriculture & fishing | 2009 |
| J.D.R. Software Services Limited | Information & communication | 1999 |
| J.K. Cuthbert & SON Limited | Construction | 1978 |
| Jackson Elite Juniors Kickboxing Ltd | Arts & recreation | 2023 |
| Jackson Elite Ladies Kickboxing Ltd | Arts & recreation | 2023 |
| Jacob Oliver Properties Limited | Real estate | 2021 |
| JAM Print Design & Printing Limited | Manufacturing | 2007 |
| Jame Real Estate Limited | Real estate | 2017 |
| James Wylie Photography Ltd | Professional & scientific | 2024 |
| Jamprint Group Limited | Manufacturing | 2022 |
| JAY House Limited | Wholesale & retail | 1988 |
| JBC Consulting Limited | Information & communication | 2016 |
| JBR Brickwork Ltd | Construction | 2025 |
| JC Fulford Properties Ltd | Real estate | 2015 |