| HFC WF1 Ltd | Hospitality | 2024 |
| Hfcl UK Limited | Manufacturing | 2024 |
| Hfhgb (Homes) | Construction | 1996 |
| Hflh Ltd | Real estate | 2024 |
| Hfnm Ltd | Information & communication | 2022 |
| Hgill Ltd | Transport & logistics | 2023 |
| HGS Construction Ltd | Construction | 2020 |
| Hgsa Properties Limited | Real estate | 2023 |
| Hgvh Limited | Professional & scientific | 2013 |
| HGZ Marketing Limited | Administrative & support | 2025 |
| HH Air Group Ltd | Wholesale & retail | 2023 |
| HH Property Estates Ltd | Real estate | 2023 |
| Hh's Wholesale Ltd | Wholesale & retail | 2026 |
| Hhayat Collective Marketing Ltd | Wholesale & retail | 2025 |
| Hhhh Holdings Ltd | Wholesale & retail | 2021 |
| Hhim Driving School Limited | Education | 2025 |
| HHK Brothers Ltd | Wholesale & retail | 2025 |
| HHN Car Trade Ltd | Wholesale & retail | 2024 |
| HI Tech Hardware Hub Ltd | Wholesale & retail | 2024 |
| HI Tech Kitchen Ltd | Manufacturing | 2022 |
| Hi-Fi Constructions Ltd | Construction | 2014 |
| Hi-Spec Facilities Services Ltd | Administrative & support | 2002 |
| Hi-Tech Consultancy Services Ltd | Information & communication | 2011 |
| Hiba Abid Group Ltd | Education | 2025 |
| Hibzo Ltd | Wholesale & retail | 2023 |
| Hickman AI & Data Science Ltd | Information & communication | 2026 |
| HID Creations Ltd | Professional & scientific | 2022 |
| Hidden Shaam Ltd | Wholesale & retail | 2026 |
| Hifivetraders Ltd | Wholesale & retail | 2026 |
| High FARM1 Ltd | Construction | 2026 |
| High Five Montessori Ltd | Health & social care | 2024 |
| High Line Roofing Ltd | Construction | 2014 |
| High Road Contractor Ltd | Construction | 2023 |
| High Street Collection UK Ltd | Wholesale & retail | 2025 |
| High Street Commerce Ltd | Wholesale & retail | 2026 |
| High Street Mortgages Ltd | Financial services | 2016 |
| High Street Security Ltd | Administrative & support | 2019 |
| High Street Wealth Ltd | Administrative & support | 2018 |
| High Touch Roofing Ltd | Construction | 2026 |
| Highbeach Properties Ltd | Real estate | 2019 |
| Highbest Ltd | Wholesale & retail | 2024 |
| Higher Moorview Limited | Real estate | 2021 |
| Highersummit Limited | Information & communication | 2023 |
| Highfield Assets Limited | Real estate | 2025 |
| Highfield Court Residents (Blackpond Lane) Limited | Hospitality | 1997 |
| Highlands Sunshine Ltd | Health & social care | 2023 |
| Highrise Bcpd Ltd | Professional & scientific | 2026 |
| Highrise International UK Ltd | Real estate | 2024 |
| Highskyroofing Ltd | Construction | 2025 |
| Highway Lettings Limited | Real estate | 2023 |
| Highwood Care Limited | Health & social care | 2016 |
| Hijaab Ltd | Wholesale & retail | 2026 |
| Hijrat Limited | Transport & logistics | 2025 |
| HIK Digital Consulting Limited | Information & communication | 2021 |
| Hikam Academy Ltd | Education | 2024 |
| Hikmai Ltd | Information & communication | 2025 |
| Hila Edition Limited | Wholesale & retail | 2024 |
| Hilaco Limited | Wholesale & retail | 2024 |
| Hillary Brook Ltd | Transport & logistics | 2024 |
| Hillingdon Trade Union Support Unit | | 1985 |
| Hillrise Accountants Limited | Professional & scientific | 2012 |
| Hillrise Associates Ltd | Administrative & support | 2019 |
| Hillside Lodge Care Limited | Health & social care | 2024 |
| Hillstone Properties Limited | Construction | 2017 |
| Hilty Construction Ltd | Construction | 2025 |
| HIM IT Service Ltd | Information & communication | 2024 |
| Himaallo Ltd | Wholesale & retail | 2026 |
| Himachali Sangeet Academy Ltd | Education | 2025 |
| HIN Apex Ltd | Wholesale & retail | 2026 |
| Hinckley Care Limited | Health & social care | 2014 |
| Hinton Bird Limited | | 1976 |
| Hiopos UK Ltd | Information & communication | 2023 |
| Hippo Care Limited | Education | 2019 |
| Hire Anything Ltd | Other services | 2024 |
| Hire Support Limited | Administrative & support | 2019 |
| Hire Works Holdings Ltd | Financial services | 2014 |
| Hire Works HW Limited | Information & communication | 2020 |
| Hire Your Blooming Fabulous Flowers Ltd | Administrative & support | 2025 |
| Hireclub Events Limited | Administrative & support | 2025 |
| Hireworks Property Ltd | Real estate | 2018 |
| Hisana Ltd | Wholesale & retail | 2024 |
| Histopath Limited | Health & social care | 2014 |
| HIT (MTK) Limited | Information & communication | 2010 |
| HIT Attractions Limited | Administrative & support | 1998 |
| HIT Consumer Products Limited | Administrative & support | 2001 |
| HIT Entertainment Finance Unlimited | Extraterritorial | 2001 |
| HIT Entertainment Limited | Information & communication | 1989 |
| HIT Ventures 5 Limited | Extraterritorial | 2002 |
| Hitachi Europe Limited | Administrative & support | 1988 |
| Hitcham House Management Limited | Households | 1983 |
| Hitchslap Ltd | Real estate | 2014 |
| Hitec (Laboratories) Ltd. | Information & communication | 1984 |
| Hitup UK Ltd | Information & communication | 2023 |
| Hitx Ltd | Information & communication | 2023 |
| Hive Performance Ltd | Wholesale & retail | 2026 |
| Hiveflow Limited | Information & communication | 2025 |
| Hixba Ltd | Education | 2022 |
| HK BGV Ltd | Real estate | 2022 |
| HK Cars Services Ltd | Transport & logistics | 2025 |
| HK Investments & Property Limited | Real estate | 2025 |