| Heygrow Limited | Real estate | 2025 |
| Hezal Kaur Ltd | Wholesale & retail | 2024 |
| Hezbuzmultipurposestore Ltd | Wholesale & retail | 2026 |
| HG Property Maintenance Ltd | Construction | 2014 |
| Hgazi Ltd | Hospitality | 2024 |
| Hgfc Limited | Health & social care | 2017 |
| HGL Developments Limited | Construction | 2013 |
| HGN Limited | Administrative & support | 2015 |
| HGN Services Limited | Professional & scientific | 2023 |
| Hgsw Limited | Administrative & support | 2011 |
| HH Management & Housekeeping Ltd | Administrative & support | 2024 |
| HHS GAS Engineering Ltd | Professional & scientific | 2022 |
| HI Bathroom Design & Consultancy Ltd | Construction | 2026 |
| Hiamzaf Ltd | Water & waste | 2025 |
| Hiba 2 Ltd | Administrative & support | 2021 |
| Hiba Ltd | Real estate | 2017 |
| Hiba Travels and Tours Ltd | Administrative & support | 2025 |
| Hicare+ Limited | Administrative & support | 2026 |
| Hickmans Electrical Engineers and Contractors Limited | Construction | 2013 |
| Hidden Genius Ltd | Professional & scientific | 2024 |
| Hife Soft Play Limited | Administrative & support | 2014 |
| Hifi Cleaners Ltd | Administrative & support | 2025 |
| High Frontier Productions Limited | Professional & scientific | 2014 |
| High Impact Europe Ltd | Professional & scientific | 2009 |
| High Knock Maize Ltd | Agriculture & fishing | 2021 |
| High Mini Market Ltd | Wholesale & retail | 2025 |
| High Penn Park Management Co. Ltd. | Households | 2017 |
| High Quality Wholesale Limited | Wholesale & retail | 2024 |
| High Size Limited | Wholesale & retail | 2025 |
| High Speed Property Solutions Limited | Real estate | 2025 |
| High Speed Rail Solutions Limited | Professional & scientific | 2012 |
| High Tech Sealants & Fixings Limited | Wholesale & retail | 2016 |
| High Worth Property Ltd | Real estate | 2024 |
| Higher Green Farm Limited | Health & social care | 2009 |
| Highgate Consultancy Limited | Professional & scientific | 2013 |
| Highlanders Consulting Ltd | Professional & scientific | 2022 |
| Highline Solar & Electrical Ltd | Construction | 2025 |
| Highways Development Planning & Management Consultancy Ltd | Professional & scientific | 2024 |
| Highworth Breakers Limited | Wholesale & retail | 2015 |
| Highworth Business Growth Ltd | Professional & scientific | 2022 |
| Highworth Business Park Limited | Administrative & support | 2014 |
| Highworth Cider and Perry Limited | Manufacturing | 2012 |
| Highworth Consultants Ltd | Administrative & support | 2025 |
| Highworth Felt Roofing Limited | Construction | 2016 |
| Highworth Holistic Health Ltd | Health & social care | 2024 |
| Highworth Link Magazine Community Interest Company | Information & communication | 2024 |
| Highworth Liquor and Wine Ltd | Wholesale & retail | 2024 |
| Highworth Nails 29A Ltd | Other services | 2024 |
| Highworth Paving Services Limited | Construction | 2016 |
| Highworth Recreation Centre (2012) | Arts & recreation | 2008 |
| Highworth Scaffolding Ltd | Other services | 2025 |
| Hill & Heaton Construction Limited | Construction | 1996 |
| Hill Family Properties Ltd | Real estate | 2022 |
| Hill Groundworks & Waterworks Ltd | Water & waste | 2019 |
| Hillier Funeral Service Limited | Other services | 1950 |
| Hills (West Midlands) Limited | Extraterritorial | 1950 |
| Hills Aggregates Limited | Extraterritorial | 2001 |
| Hills Haulage Limited | Extraterritorial | 1964 |
| Hills Homes Developments Limited | Construction | 2012 |
| Hills Municipal Collections Limited | Water & waste | 2016 |
| Hills NRE Limited | Professional & scientific | 2024 |
| Hills Quarry Products Limited | Mining & quarrying | 2001 |
| Hills Recycling Limited | Extraterritorial | 1980 |
| Hills UK Limited | Construction | 1954 |
| Hills Waste Collection Limited | Extraterritorial | 2001 |
| Hills Waste Disposal Limited | Extraterritorial | 1934 |
| Hills Waste Limited | Extraterritorial | 2001 |
| Hills Waste Solutions Limited | Water & waste | 1956 |
| Hillside Building Services (Swindon) Limited | Construction | 2011 |
| Hillsmead Ltd | | 2009 |
| Hilltel Care Ltd | Public administration | 2022 |
| Hillview Property Company Limited | Real estate | 2020 |
| Hilt-Logistics Ltd | Transport & logistics | 2025 |
| Himalayan Takeaway Ltd | Hospitality | 2025 |
| Hinc Associates Ltd | Administrative & support | 2018 |
| Hinders Building Ltd | Construction | 2021 |
| Hinders of Swindon Limited | Wholesale & retail | 2002 |
| Hindley-Baxter Associates Ltd | Professional & scientific | 2021 |
| Hinds Properties Ltd | Real estate | 2024 |
| Hinton Health Limited | Health & social care | 2020 |
| Hipgnosis Copyrights PLC | Information & communication | 2016 |
| Hirstville Ventures International Limited | Hospitality | 2023 |
| Histar Limited | Wholesale & retail | 2008 |
| Historic England Limited | Public administration | 2014 |
| Hitchman Creations Limited | Construction | 2013 |
| Hitkey Limited | Real estate | 1989 |
| Hive Social Media Management Limited | Professional & scientific | 2025 |
| Hivestack Solutions Ltd | Information & communication | 2025 |
| Hiwa Services Ltd | Other services | 2023 |
| HJ Refurbs Ltd | Real estate | 2026 |
| Hjames Motors Ltd | Wholesale & retail | 2018 |
| HJB Lettings Ltd | Real estate | 2024 |
| HJC Consulting Ltd | Information & communication | 2018 |
| HJL Holdings Limited | Financial services | 2021 |
| HJP Mechanical Engineering Consultant Limited | Professional & scientific | 2024 |
| HJR Consulting Ltd | Professional & scientific | 2013 |
| HJS Emission Technology Limited | Manufacturing | 2022 |
| HK Building Limited | Construction | 2026 |
| Hkmom.Ukcook Limited | Hospitality | 2025 |
| HKS Recruitment Limited | Administrative & support | 2009 |