| Haines Services Limited | Administrative & support | 2015 |
| Haining Electrical Ltd | Construction | 2021 |
| Hair at 46 Limited | Other services | 2022 |
| Hair by Mandy Limited | Other services | 2022 |
| Hair Trunk Ltd | Wholesale & retail | 2022 |
| Hairkraft Ltd | Other services | 2026 |
| Hajoza Limited | Health & social care | 2019 |
| Halasabele Estates Limited | Real estate | 2025 |
| Halcyon Front Limited | Construction | 2013 |
| Hale Goods Ltd | Wholesale & retail | 2020 |
| Hale Matcha Ltd | Wholesale & retail | 2025 |
| Half Full Limited | Real estate | 2001 |
| Halia Tech Limited | Information & communication | 2026 |
| Hall & Co (Otford) Ltd | Wholesale & retail | 2007 |
| Hallifield Consulting Limited | Information & communication | 2026 |
| Hallmark Consult Ltd | Professional & scientific | 2012 |
| Hallmark Sports Limited | Professional & scientific | 2019 |
| Hallwoods Solutions Ltd | Construction | 2026 |
| Hallybone Barnard Sprinklers Ltd | Construction | 2023 |
| Halo & Honey Limited | Manufacturing | 2026 |
| Halo Home Security Limited | Construction | 2014 |
| Hameemy Services Limited | Professional & scientific | 2025 |
| Hammond Drysuits Ltd | Manufacturing | 2005 |
| Hampstead Marine (Yalding) Limited | Transport & logistics | 1993 |
| Hampton Close Ltd | Households | 2020 |
| Hana Control Systems Ltd. | Information & communication | 2011 |
| Handle Data Ltd | Information & communication | 2019 |
| Hands on Window Cleaning Ltd. | Administrative & support | 2015 |
| HANGAR-117 Ltd | Wholesale & retail | 2024 |
| Haniv Investment Limited | Real estate | 2019 |
| Hannah Thompson Interiors Limited | Professional & scientific | 2025 |
| Hanningfield Properties Limited | Real estate | 2024 |
| Hannspree Services Ltd | Construction | 2026 |
| Hansan Technologies Limited | Information & communication | 2026 |
| Hapi Property PMR Ltd | Construction | 2021 |
| Happydaydolphin Ltd | Wholesale & retail | 2024 |
| Harbelle Print Ltd | Manufacturing | 2026 |
| Harbour Wall Limited | Information & communication | 2005 |
| Harden Travel Group Ltd | Administrative & support | 2015 |
| Harding Design Limited | Professional & scientific | 2007 |
| Hardion Ltd | Health & social care | 2023 |
| Hardy Dunn Contracts Ltd | Construction | 2025 |
| Haris Khan Ltd | Wholesale & retail | 2025 |
| Haritha Limited | Wholesale & retail | 2024 |
| Haritz Ltd | Wholesale & retail | 2014 |
| Harley & Associates Ltd | Professional & scientific | 2018 |
| Harmodes UK Ltd | Professional & scientific | 2018 |
| Harmony Five Properties & Investments Limited | Real estate | 2024 |
| Harmony Hills Support Ltd | Health & social care | 2023 |
| Harmony Link Support Services Limited | Administrative & support | 2024 |
| Harnic Services Limited | Real estate | 2016 |
| Harper Energy Limited | Professional & scientific | 2005 |
| Harris Grant Limited | Construction | 2020 |
| Harrison & Clough,Limited | Wholesale & retail | 1957 |
| Harrison Advanced Rods Ltd | Manufacturing | 2026 |
| Harry Bright Limited | Real estate | 2008 |
| Hart Business Services Limited | Information & communication | 1999 |
| Hart Vybes Inc. Limited | Information & communication | 2020 |
| Hartley Property Holdings Limited | Real estate | 2019 |
| Hartman Engineering (Holdings) Limited | Construction | 2007 |
| Hartman Engineering (Properties) LLP | | 2007 |
| Hartman Engineering Limited | Construction | 2000 |
| Hary Porter Trade Ltd | Water & waste | 2015 |
| Haselwood Consulting Limited | Professional & scientific | 2010 |
| Hast Labs Limited | Information & communication | 1996 |
| Hatched Agency Ltd | Information & communication | 2024 |
| Hatched Brands Limited | Administrative & support | 2012 |
| Hatter Events Ltd | Hospitality | 2024 |
| Hatter LOK Ltd | Hospitality | 2024 |
| Hatter NP Ltd | Hospitality | 2024 |
| Havelock Gate Residents Company Limited | Households | 2010 |
| Haven Archway Ltd | Health & social care | 2025 |
| Haven Solutionz Ltd | Health & social care | 2017 |
| Havilah Discovery Care Services Limited | Public administration | 2024 |
| Havonyx Properties Ltd | Real estate | 2024 |
| Hawkins (South Darenth) Limited | Real estate | 1986 |
| Hawkins BIM Limited | Professional & scientific | 2024 |
| Hawks Crane Hire Limited | Administrative & support | 2014 |
| Hawks Workplace Ltd | Administrative & support | 2026 |
| Hawkspare Consultancy Ltd | Professional & scientific | 2020 |
| Hawkspare Farming Limited | Agriculture & fishing | 2011 |
| Hawkspare Limited | Wholesale & retail | 1986 |
| Hawley Cafe Ltd | Hospitality | 2018 |
| Hawley Garden Centre Car Wash Ltd | Wholesale & retail | 2018 |
| Hawley Road Garage Limited | Wholesale & retail | 1976 |
| Hayden Youth Association Ltd | Arts & recreation | 2026 |
| Hayes Learning Ltd | Education | 2023 |
| Hayshine Aesthetics Ltd | Other services | 2024 |
| Hazjam Limited | Professional & scientific | 2025 |
| HB Editorial Services Limited | Information & communication | 2009 |
| Hbnt Healthcare Consultancy Limited | Health & social care | 2018 |
| HC Traffic Management Ltd | Construction | 2025 |
| HCH Drylining Ltd | Construction | 2012 |
| HCM (London) Ltd | Hospitality | 2019 |
| Hcomb Ltd | Real estate | 2021 |
| HD Motorsports Ltd | Wholesale & retail | 2021 |
| HD Removals Ltd | Transport & logistics | 2021 |
| HDS Estates Limited | Real estate | 2022 |
| Health & Simplicity Ltd | Health & social care | 2023 |
| Health IS Wealth - Organic Food Supplements Company Ltd | Hospitality | 2019 |