| Highfield Autos Ltd | Wholesale & retail | 2021 |
| Highfield Trees Limited | Agriculture & fishing | 2013 |
| Highgate Contracts Ltd | Construction | 2024 |
| Highways Technology Specialists Ltd | Information & communication | 2025 |
| Hill Homologation Ltd | Administrative & support | 2021 |
| Hillcrest & Lyndale Care & Support Services Limited | Health & social care | 2010 |
| Hinchliff Housing Ltd | Real estate | 2026 |
| Hindsight Covert Solutions Limited | Administrative & support | 2011 |
| Hipe Consulting Ltd | Professional & scientific | 2017 |
| Hipe Property Ltd | Real estate | 2025 |
| HJ Aesthetics Ltd. | Administrative & support | 2017 |
| HJS Contracting Limited | Construction | 2026 |
| HJS Electrics Ltd | Construction | 2022 |
| HLD Industrial Services Ltd | Professional & scientific | 2010 |
| HLW 120 Limited | Health & social care | 2001 |
| Hlzy Properties Limited | Real estate | 2025 |
| Hogannovare Limited | Construction | 2025 |
| Holdra Limited | Information & communication | 2014 |
| Holistic at Home Limited | Wholesale & retail | 2025 |
| Holly Tree House Nursery Limited | Education | 2025 |
| Holmes Beaumont & Holroyd Limited | Professional & scientific | 2017 |
| Holmes Transport Ltd | Transport & logistics | 2025 |
| Holmestead Property Limited | Real estate | 2022 |
| Holmo Housing Limited | Real estate | 2024 |
| Home by Eight Ltd | Manufacturing | 2025 |
| Home Services Group Ltd | Other services | 2022 |
| Home Windows Ltd | Information & communication | 2024 |
| Homecaringservices Limited | Health & social care | 2013 |
| Homefront Products Limited | Wholesale & retail | 2010 |
| Homemaker Mortgages Limited | Financial services | 2019 |
| Homemaker Properties Limited | Real estate | 2015 |
| Honey Care Ltd | Health & social care | 2019 |
| Hopscotch Early Years Ltd | Health & social care | 2023 |
| Hopton Architecture Limited | Professional & scientific | 2009 |
| Horbury Financial Services Limited | Financial services | 2003 |
| Horbury's Real Estate Ltd | Real estate | 2025 |
| Horners Contractors Ltd | Construction | 2023 |
| Hornersfood Limited | Hospitality | 2022 |
| House of Ales Ltd | Wholesale & retail | 2017 |
| House of Heritage Design Limited | Professional & scientific | 2017 |
| House of HOL Ltd | Other services | 2024 |
| House of Vapour Limited | Wholesale & retail | 2015 |
| Househunt Properties Limited | Real estate | 2012 |
| Howson Consultancy Ltd | Professional & scientific | 2025 |
| Howwelink Ltd | Extraterritorial | 2019 |
| Hoyle Mill MOT Centre Ltd | Wholesale & retail | 2019 |
| HRS Waste Management Ltd | Water & waste | 2020 |
| HRW Construction Limited | Construction | 2024 |
| HSD Online Ltd | Extraterritorial | 2006 |
| Htba Pubs Ltd | Hospitality | 2024 |
| Hubys Fish Bar Limited | Hospitality | 2024 |
| Hundhill UK Limited | Arts & recreation | 1993 |
| Hungry Interns Ltd. | Administrative & support | 2013 |
| Hunter Grove Apartments Residents Management Company Limited | Households | 2021 |
| Huxton Building Services Limited | Construction | 2014 |
| Hydetrain Ltd | Professional & scientific | 2025 |
| Hyperprize Limited | Other services | 2026 |
| I a Investments Ltd | Real estate | 2014 |
| I Broke Ltd | Wholesale & retail | 2025 |
| I H Equipment Ltd | Construction | 2006 |
| I WAS There Live Events Ltd | Wholesale & retail | 2025 |
| Iacob Trans Ltd | Transport & logistics | 2017 |
| IAN Charles Doig Ltd | Professional & scientific | 2015 |
| Ibby's Kebab House Limited | Hospitality | 2023 |
| Ice K9 Limited | Administrative & support | 2022 |
| Iceco Europe Limited | Manufacturing | 2004 |
| Iceco Limited | Manufacturing | 2009 |
| IIT Logistics Ltd | Transport & logistics | 2026 |
| Ileogben and Company Limited | Health & social care | 2015 |
| Image Install Ltd | Manufacturing | 2018 |
| IMAGINE8 Network Ltd | Professional & scientific | 2026 |
| Imove Property Management Ltd | Real estate | 2025 |
| Impact Coaching Support Ltd | Administrative & support | 2023 |
| IN House Property Box Limited | Real estate | 2023 |
| IN House Property Lettings Ltd | Real estate | 2021 |
| IN Safe Hands Care Ltd | Health & social care | 2011 |
| Inacio Januario SA Ltd | Construction | 2019 |
| Inaureate Ltd | Financial services | 2025 |
| Incanus Ltd | Information & communication | 2022 |
| Independent Packaging Technicians Limited | Professional & scientific | 2016 |
| Indiglow Ltd | Wholesale & retail | 2026 |
| Individual Hotels Limited | Hospitality | 2007 |
| Infed Support Ltd | Hospitality | 2008 |
| Inferno Distribution UK Ltd | Wholesale & retail | 2013 |
| Infia Midco 1 Limited | Manufacturing | 2025 |
| Infia Midco 2 Limited | Manufacturing | 2025 |
| Infinite Mileage Logistics Ltd | Transport & logistics | 2025 |
| Infinity Funeral Arrangements Limited | Other services | 2014 |
| Infinity Holiday Homes Ltd | Hospitality | 2021 |
| Infinity Inns (Yorkshire) Ltd | Other services | 2019 |
| Informal Learning Ltd | Hospitality | 2008 |
| Inga Group Limited | Financial services | 2021 |
| Ings Environmental Limited | Water & waste | 2011 |
| INK Kingz Tattoo Studio Limited | Other services | 2022 |
| Inline Kitchens Limited | Manufacturing | 2007 |
| Innerworth Counselling Ltd | Health & social care | 2024 |
| Innovate Associates Limited | Construction | 2021 |
| Innovate Development Services Ltd | Professional & scientific | 2022 |
| Innovative Solutions & Services Limited | Professional & scientific | 2019 |
| Innovex Enterprise Limited | Professional & scientific | 2020 |