| Harvest Fine Foods Limited | Wholesale & retail | 2001 |
| Harvesters Properties Ltd | Administrative & support | 2013 |
| Harvey Road Residents Management Company Limited | Households | 2015 |
| Harvey's B Ltd | Other services | 2023 |
| Harvey's Fashion House Ltd | Wholesale & retail | 2020 |
| HAS Technologies Ltd | Information & communication | 2018 |
| Haseeb Halal Meat Ltd | Wholesale & retail | 2016 |
| Hashiza Ltd | Wholesale & retail | 2024 |
| Hass Construction Limited | Professional & scientific | 2015 |
| Hassan Cars Limited | Wholesale & retail | 2019 |
| Hassham Qureshi Ltd | Administrative & support | 2025 |
| Hasu Biotech Ltd | Professional & scientific | 2020 |
| Hathur Services Limited | Transport & logistics | 2024 |
| Hattrick Studios Ltd | Information & communication | 2022 |
| Haulage Hawk Ltd | Transport & logistics | 2021 |
| Haulage Training & Consultancy Ltd | Other services | 2017 |
| Haulix Limited | Transport & logistics | 2025 |
| Haval Building Ltd | Construction | 2025 |
| Haveli Bar and Grill Ltd | Manufacturing | 2024 |
| Haveli Events Ltd | Hospitality | 2023 |
| Haven & Hearth Designer Ltd | Manufacturing | 2022 |
| Haven Nest Property Ltd | Real estate | 2025 |
| Havencourt Care Limited | Health & social care | 2019 |
| Havendale Limited | Real estate | 2000 |
| Havenfield Care Group Ltd | Health & social care | 2025 |
| Havenfield Care Ltd | Health & social care | 2025 |
| Hawick Limited | Wholesale & retail | 2017 |
| Hawk 360 Limited | Administrative & support | 2020 |
| Hawk Builders Ltd | Other services | 2020 |
| Hawk Freight Services Limited | Transport & logistics | 1987 |
| Hawk Hauling Limited | Transport & logistics | 2018 |
| Hawk Logistics Limited | Transport & logistics | 2015 |
| Hawk Management Consulting LLP | | 2010 |
| Hawk Rentals Limited | Administrative & support | 2008 |
| Hawk Transport Ltd | Transport & logistics | 2015 |
| Hawk Windows Ltd | Construction | 2020 |
| HAWKCARS247 Ltd | Administrative & support | 2024 |
| Hawke Logistics Limited | Transport & logistics | 2014 |
| Hawker F&B Ltd | Hospitality | 2020 |
| Hawksit Ltd | Information & communication | 2019 |
| Hayat Builders Ltd | Construction | 2024 |
| Hayat Motors Limited | Wholesale & retail | 2026 |
| Hayati.World Limited | Wholesale & retail | 2021 |
| Haybrook College Trust | Education | 2015 |
| Hayder Properties Ltd | Real estate | 2021 |
| Hayes 25 Ltd | Real estate | 2022 |
| Hayes Concrete Pump Ltd | Construction | 2025 |
| Hayes Plant Hire Ltd | Administrative & support | 2024 |
| Hayes S a Consultants Limited | Administrative & support | 2009 |
| Hayling Close Residents Management Company Limited | Households | 2015 |
| Haymill Associates Limited | Professional & scientific | 2014 |
| Haymill Computers Limited | Information & communication | 2011 |
| Haymill Holdings Limited | Financial services | 2025 |
| Haymill Homes Ltd | Real estate | 2021 |
| Hayre Construction London Limited | Extraterritorial | 2025 |
| Hayre Group Limited | Extraterritorial | 2025 |
| Hayward Express Limited | Financial services | 2020 |
| Haze Lounge Ltd | Other services | 2020 |
| Hazel & Oak Ltd | Real estate | 2026 |
| Hazel Care Services Limited | Health & social care | 2018 |
| Hazeledge Holdings Limited | Health & social care | 2018 |
| Hazeledge Ltd | Health & social care | 1998 |
| Hazelworth Ltd | Hospitality | 2018 |
| Hazo Pharmaceuticals Ltd | Professional & scientific | 2026 |
| HB Building & Paving Ltd | Construction | 2018 |
| HB Concept Ltd | Professional & scientific | 2009 |
| Hbacs Ltd | Professional & scientific | 2009 |
| HBC Logistics Ltd | Transport & logistics | 2017 |
| HBM Solution Limited | Professional & scientific | 2013 |
| HBS Chertsey Ltd | Wholesale & retail | 2025 |
| HC AV Events Ltd | Arts & recreation | 2016 |
| HC Nest Limited | Real estate | 2022 |
| HC Tech Solutions Ltd | Manufacturing | 2024 |
| HC Transport Ltd | Transport & logistics | 2023 |
| HCB Empire Limited | Transport & logistics | 2024 |
| Hcha Property Ltd | Real estate | 2025 |
| HCI Group Ltd | Financial services | 2026 |
| HCP MBS Studios UK Limited | Professional & scientific | 2020 |
| HCS Berkshire Cleaning Services Ltd | Administrative & support | 2022 |
| HD 35 CIC | Other services | 2017 |
| HD 777 Limited | Professional & scientific | 2025 |
| HD Burnham Limited | Real estate | 2021 |
| HD Football TR Limited | Financial services | 2026 |
| Hdam Corporation Ltd | Wholesale & retail | 2019 |
| Hdsingh Consulting Ltd | Information & communication | 2025 |
| Hdsk Ltd | Wholesale & retail | 2020 |
| HE11 Support and Care Ltd | Health & social care | 2026 |
| Head Chef Ltd | Hospitality | 2024 |
| HEAD2TOE Global Ltd | Wholesale & retail | 2020 |
| Heading 360 Ltd | Transport & logistics | 2024 |
| Headstorm Ltd | Construction | 2020 |
| Heal SB Ltd | Other services | 2024 |
| Healing the Hurts Ltd | Health & social care | 2024 |
| Health First Ltd | Wholesale & retail | 2024 |
| Health Horizon Wellness Ltd | Health & social care | 2023 |
| Healthcare Business Consultancy Limited | Professional & scientific | 2023 |
| Healthcare Holdco Ltd | Financial services | 2013 |
| Healthy Glow Care Limited | Health & social care | 2023 |
| Healthy Hedonism Ltd | Manufacturing | 2020 |
| Heart of Oak Buildings Limited | Manufacturing | 1999 |