| Harcom Landscapes Ltd | Administrative & support | 2025 |
| Harling Taylor Property Management Limited | Real estate | 2017 |
| Hart Supply Excellence Limited | Professional & scientific | 2025 |
| Hartland LVA LLP | | 2022 |
| Hatherleigh Limited | Professional & scientific | 2019 |
| Hatherleigh LVA LLP | | 2015 |
| Hatherleigh Two LVA LLP | | 2020 |
| Hathi IT Limited | Administrative & support | 2016 |
| Hatton Holdings Limited | Agriculture & fishing | 2015 |
| Hayden Hill London Limited | Wholesale & retail | 2024 |
| Hayden Hill Retail Limited | Wholesale & retail | 2021 |
| Healing Beliefs Limited | Health & social care | 2022 |
| Heartfelt Care Yeovil and Sherborne Limited | Health & social care | 2018 |
| Heat Rejection Ltd | Information & communication | 2020 |
| Heath Films Limited | Professional & scientific | 2016 |
| Heatwave Electrical & Renewables Ltd | Extraterritorial | 2019 |
| Heatwave Mechanical Services Limited | Construction | 2014 |
| Heavenly Morsels Group Limited | Financial services | 2022 |
| Heavenly Morsels Ltd | Hospitality | 2018 |
| Hebe Medical Ltd | Health & social care | 2026 |
| Hector Powe 1908 Limited | Manufacturing | 2017 |
| Hellis Solutions Ltd | Professional & scientific | 2016 |
| HER HRH Limited | Hospitality | 2024 |
| Herbert J. White Jewellers (Southern) Limited | Wholesale & retail | 1971 |
| Heritage Electrical Solutions Ltd | Construction | 2024 |
| Hero Design London Limited | Professional & scientific | 2020 |
| Hero Yoga London Limited | Health & social care | 2020 |
| HFH (SW) Ltd | Construction | 2023 |
| HGE Media Limited | Information & communication | 2015 |
| Highley LVA LLP | | 2021 |
| Hike Marketing Limited | Professional & scientific | 2021 |
| Hills Body & MOT Centre Limited | Wholesale & retail | 2010 |
| Hill’S Tree & Land Services Ltd | Administrative & support | 2023 |
| Hinton Harvey Properties Ltd | Real estate | 2015 |
| Hodgson Seafoods Limited | Wholesale & retail | 2023 |
| Hodgsons Consulting Services Limited | Professional & scientific | 2013 |
| Hofdeblocq Ltd | Arts & recreation | 2013 |
| Holland Harvey Limited | Professional & scientific | 2012 |
| Hollie Fernando Studio Ltd | Professional & scientific | 2025 |
| Holtwood Farm Partnership LP | | 2018 |
| Home Credit Limited | Other services | 2000 |
| Homegrown Media Limited | Professional & scientific | 2010 |
| Homon Limited | Hospitality | 2018 |
| Honeycombe Court Limited | Households | 1993 |
| Honeycombe Management Limited | Households | 1993 |
| Hoofworx Ltd | Agriculture & fishing | 2025 |
| Hook Valley LVA LLP | | 2020 |
| Hooroo Ltd | Hospitality | 2013 |
| Hoptails Ltd | Other services | 2023 |
| Hortus Dorset Limited | Professional & scientific | 2020 |
| Host Home Ltd | Wholesale & retail | 2018 |
| Howland Evans Architects Limited | Professional & scientific | 2017 |
| HSNAKKURT68 Ltd | Hospitality | 2024 |
| HTX Solutions Limited | Mining & quarrying | 2019 |
| Hudson Building Services Ltd | Construction | 2025 |
| Human Dimensions Development Limited | Education | 2008 |
| Humpit's Limited | Water & waste | 2016 |
| Hundred Club (London) Ltd | Wholesale & retail | 2021 |
| Hunt's Fleet Limited | Wholesale & retail | 2025 |
| Hunter Adams Consulting Limited | Professional & scientific | 2019 |
| Huntley Associates Ltd | Real estate | 2019 |
| Hunts Accountants Limited | Professional & scientific | 2003 |
| Hunts Management Services Limited | Professional & scientific | 2021 |
| Hunt’S Foodservice Holdings Limited | Wholesale & retail | 2021 |
| Hurren Consultants Ltd | Other services | 2012 |
| Hymir Ltd | Financial services | 2021 |
| I AM a Bookworm Ltd | Information & communication | 2011 |
| I3K Ltd | Professional & scientific | 2014 |
| IAN FAY Joinery Limited | Manufacturing | 2011 |
| IAN Pomeroy Limited | Professional & scientific | 2011 |
| Ice Cream Makes People Happy Limited | Manufacturing | 2025 |
| ILLUMIN8 Designs UK Limited | Manufacturing | 2026 |
| In-Able Limited | Professional & scientific | 2024 |
| Infinity Event Promotions Ltd | Arts & recreation | 2026 |
| Innes Mitchell Ltd | Wholesale & retail | 2025 |
| Inspire & Align Ltd | Professional & scientific | 2025 |
| Intaconsult Limited | Professional & scientific | 2002 |
| Intagroup Holdings UK Limited | Financial services | 2023 |
| Intalet Limited | Real estate | 2004 |
| International Caravanning Association Limited | Arts & recreation | 1974 |
| Investment Property Europe Limited | Wholesale & retail | 2002 |
| IP Square Ltd | Administrative & support | 2021 |
| Ipplepen LVA LLP | | 2014 |
| IQ Photography Ltd | Professional & scientific | 2021 |
| Irara Secure Solutions Limited | Public administration | 2025 |
| Irara Services Limited | Public administration | 2017 |
| J & G Garden Machinery Ltd | Manufacturing | 2017 |
| J & P Renovations Ltd | Real estate | 2007 |
| J & R Estate Holdings Limited | Real estate | 2026 |
| J Bennett Joinery Ltd | Manufacturing | 2017 |
| J F Multisport Coaching Limited | Arts & recreation | 2009 |
| J Jarvie Woodwork Ltd | Construction | 2018 |
| J K Services Dorset Ltd | Construction | 2022 |
| Jadavji's Ltd | Wholesale & retail | 2025 |
| JAG Carpentry & Build Ltd | Construction | 2025 |
| Jaguar Contracting Limited | Wholesale & retail | 1999 |
| JAL Jarvie Limited | Real estate | 2023 |
| Janaye Properties Ltd | Real estate | 2021 |
| Jarubel Ltd | Real estate | 2024 |
| Jemima Herbert Interiors Ltd | Wholesale & retail | 2024 |