| High Wycombe Hand Car Wash Limited | Administrative & support | 2025 |
| Highframe Ltd | Professional & scientific | 2026 |
| Highland Developers Ltd | Construction | 2023 |
| Highland SAI Ltd | Real estate | 2022 |
| Highlander Hub Ltd | Transport & logistics | 2023 |
| Highlight Interior Design Ltd | Professional & scientific | 2021 |
| Highlights Asset Management Ltd | Real estate | 2019 |
| Highlights Property Ltd | Real estate | 2018 |
| Hightec Construction UK Ltd | Construction | 2023 |
| Hightec CONSTRUCTION1 Limited | Construction | 2019 |
| Highteck Ltd | Wholesale & retail | 2023 |
| Hightek Services Ltd. | Information & communication | 2011 |
| Hijab AL Emira Ltd | Wholesale & retail | 2025 |
| Hijaz Enterprises Limited | Wholesale & retail | 2025 |
| Hilac Restaurant Limited | Hospitality | 2010 |
| Hill Drive Cars Ltd | Wholesale & retail | 2024 |
| Hillingdon Asian Women Group | Administrative & support | 2006 |
| Hillingdon Autistic Care & Support Limited | Education | 2012 |
| Hillingdon House (UK) Limited | Real estate | 2015 |
| Hillingdon Play Association | Health & social care | 2008 |
| Hillingdon Somali Women's Group | Administrative & support | 2002 |
| Hillingdon Superstore Ltd | Wholesale & retail | 2023 |
| Hilmi BUS Holdings Limited | Transport & logistics | 2025 |
| Hilmi Mobility Group Limited | Financial services | 2017 |
| Hilton Interiors Ltd | Manufacturing | 2019 |
| Hilton Manor Holdings Ltd | Real estate | 2015 |
| Himbol Ltd | Real estate | 2025 |
| Hindmarch Consulting & Co Limited | Professional & scientific | 2021 |
| Hira Transport Services Ltd | Transport & logistics | 2021 |
| Hire My Idea Ltd | Professional & scientific | 2026 |
| HIRE2STYLE Ltd | Wholesale & retail | 2018 |
| Hiru Beer Wine Ltd | Real estate | 2024 |
| History Made Simple Ltd | Information & communication | 2014 |
| HIT the Road Jack Limited | Information & communication | 2015 |
| Hitech Services Ltd | Transport & logistics | 2018 |
| Hiya Legal Solutions Ltd | Professional & scientific | 2025 |
| Hiya Party Limited | Wholesale & retail | 2017 |
| HJ Anand Limited | Wholesale & retail | 2025 |
| HJ Car Services Ltd | Administrative & support | 2019 |
| HJ UK Property Ltd | Real estate | 2019 |
| HJK General Trading UK Limited | Wholesale & retail | 2023 |
| HJP Civil Engineering Services Ltd | Construction | 2020 |
| HK Building Contractors Ltd | Construction | 2025 |
| HK Chopra Ltd | Real estate | 2026 |
| HK Khurana UK Ltd | Wholesale & retail | 2023 |
| HK Mobile Accessories Limited | Wholesale & retail | 2005 |
| HK Optical Limited | Health & social care | 2025 |
| HK Select Ltd | Wholesale & retail | 2026 |
| HK Star Ltd | Construction | 2025 |
| HKD Enterprise Ltd | Wholesale & retail | 2025 |
| HKS Consultancy Limited | Real estate | 2018 |
| HL & HL Partnership Limited | Wholesale & retail | 2025 |
| HM & Construction Limited | Construction | 2022 |
| HM Developers Limited | Construction | 2026 |
| HM Estates & Investments Ltd | Real estate | 2024 |
| HM Investment Hayes Ltd | Real estate | 2025 |
| HM Joiners Limited | Construction | 2017 |
| HM Kitchen & Bedroom Ltd | Construction | 2023 |
| HM32 Ltd | Wholesale & retail | 2024 |
| Hmaz Ltd | Wholesale & retail | 2023 |
| HMC Halal Meats Ltd | Wholesale & retail | 2018 |
| HMD Associates Ltd | Professional & scientific | 2021 |
| HMJ London Limited | Hospitality | 2025 |
| Hmmn Limited | Manufacturing | 2025 |
| HMO and Properties UK Ltd | Real estate | 2025 |
| HMS Transport Ltd | Transport & logistics | 2021 |
| HMT93 Ltd | Construction | 2025 |
| HMV Trade Limited | Construction | 2025 |
| HN Essence Ltd | Wholesale & retail | 2025 |
| Hnagra Property Limited | Real estate | 2026 |
| HNH Limited | Real estate | 2018 |
| HNM Enterprises Ltd | Wholesale & retail | 2025 |
| Hnsg Properties Management Ltd | Real estate | 2024 |
| HNZ UK Nexus Limited | Wholesale & retail | 2024 |
| HOB Simply Bargain Ltd | Wholesale & retail | 2022 |
| Hobby Toys Ltd | Wholesale & retail | 2015 |
| Hobsons Estates Limited | Real estate | 2013 |
| Hobsons Travels Ltd | Administrative & support | 2004 |
| Hockmedia Ltd | Information & communication | 2024 |
| Hoefler Group Ltd | Professional & scientific | 2023 |
| HOG Apex Trade Ltd | Wholesale & retail | 2025 |
| Hogarth Associates Projects & Contracts Management Limited | Professional & scientific | 1997 |
| Holden Estate Management Ltd | Real estate | 2018 |
| Holden Estates Ltd | Real estate | 2018 |
| Holdon Properties Ltd | Real estate | 2023 |
| Holdwise Limited | Real estate | 2025 |
| Holidayway Travel Ltd | Administrative & support | 2015 |
| Holmes Air Conditioning & Electrical Services Ltd | Construction | 2014 |
| Home & Garden Group Ltd | Wholesale & retail | 2020 |
| Home 4U Construction Limited | Construction | 2025 |
| Home AV Direct Limited | Wholesale & retail | 2025 |
| Home Design and Build PVT Limited | Construction | 2020 |
| Home Essential Hub Ltd | Wholesale & retail | 2025 |
| Home Essentials Limited | Real estate | 2012 |
| Home Expert Construction Ltd | Construction | 2024 |
| Home Goods and Accessories Ltd | Wholesale & retail | 2025 |
| Home Life Furnishing Ltd | Extraterritorial | 2004 |
| Home Renovation & Maintenance Ltd | Construction | 2023 |
| Home Setups Limited | Wholesale & retail | 2015 |
| Home Tech London Ltd | Wholesale & retail | 2018 |