| Haemacon Limited | Real estate | 2012 |
| Hagen Advisory Ltd | Professional & scientific | 2026 |
| Haiems Limited | Information & communication | 2022 |
| Hainault House Ltd | Real estate | 2022 |
| Hair by Shelley Limited | Other services | 2012 |
| Hair Hectik (Bromley) Ltd | Other services | 2009 |
| Hairbykuks Ltd | Other services | 2025 |
| Hairdobooking Ltd | Information & communication | 2021 |
| Hairglo Limited | Wholesale & retail | 2019 |
| Haiyan Dame Sanitary Wares Co., Ltd | Extraterritorial | 2012 |
| Halal -E-Rizq Company Ltd | Hospitality | 2024 |
| Halden Heights Limited | Health & social care | 2011 |
| Hale Point (London) RTM Company Limited | Real estate | 2025 |
| Halesworth & Hurlston Limited | Financial services | 2022 |
| Half Tide Dock Limited | Households | 2007 |
| Halil Sevuk Ltd | Extraterritorial | 2024 |
| Hall Garages Management Limited(The) | Administrative & support | 1984 |
| Hallmareca UK Limited | Wholesale & retail | 2024 |
| Halls Farm Allotment Gardens Ltd | Arts & recreation | 2019 |
| Halmar Property Services Ltd | Real estate | 2025 |
| Halmarin Consultants Ltd | Administrative & support | 2012 |
| Halt Estates Limited | Financial services | 2016 |
| HAM Court (Romford) RTM Company Limited | Real estate | 2014 |
| Hamden Technology Ltd | Information & communication | 2022 |
| Hamilton Collective Ltd | Wholesale & retail | 2024 |
| Hamilton Human Resources Consulting Limited | Professional & scientific | 2010 |
| Hamilton ROW Limited | Real estate | 2004 |
| Hampers by Gifty Limited | Wholesale & retail | 2020 |
| Hampsons Consultancy Services Ltd | Information & communication | 2024 |
| Hampton Gallery Limited | Wholesale & retail | 2025 |
| Hampton Grange (Bromley) Management Company Limited | Real estate | 2014 |
| HAN Food Limited | Wholesale & retail | 2025 |
| Hanchar Consulting Ltd | Professional & scientific | 2023 |
| Hancock & Sons Builders Limited | Construction | 2010 |
| Handling Associates Limited | Manufacturing | 2003 |
| Handmade With Love Ltd | Manufacturing | 2020 |
| Handsome Housing Ltd | Real estate | 2022 |
| Hangzhou Quzi Textile Co., Ltd | Extraterritorial | 2014 |
| Hankin's Homes Limited | Construction | 2020 |
| Hannadmin Ltd | Administrative & support | 2016 |
| Hanover Place (London) RTM Company Limited | Real estate | 2024 |
| Hanover Place 2 (London) RTM Company Limited | Real estate | 2025 |
| Hanscombe Court (Hertford) Management Company Limited | Households | 1986 |
| Hansford's Joinery Ltd | Construction | 2019 |
| Hanson & Field Properties LLP | | 2020 |
| Hanson Regan Limited | Administrative & support | 2006 |
| Hanu Logistics Limited | Transport & logistics | 2017 |
| HAP Electrical Services Limited | Manufacturing | 2014 |
| Happy Garden Zhong Limited | Hospitality | 2017 |
| Happy Nails 8689 Ltd | Other services | 2024 |
| Happy Panda Bromley Limited | Hospitality | 2024 |
| Happy Tiney Home Nursery Limited | Health & social care | 2026 |
| Happyguestuk Limited | Information & communication | 2026 |
| Happynest Play Cafe Ltd | Hospitality | 2026 |
| HAR Naturel Limited | Extraterritorial | 2021 |
| Harcourt Developments Ltd | Administrative & support | 2008 |
| Harding Place Forest Hill Limited | Households | 2007 |
| Hardrock Consultancy Limited | Information & communication | 2017 |
| Hardwick House (Bromley) RTM Company Limited | Real estate | 2024 |
| Hardy Brothers Development Limited | Construction | 2023 |
| Hardy House Management Limited | Households | 1980 |
| Harford Court Management Company Limited | Households | 2017 |
| Hari Skills Ltd | Construction | 2018 |
| Harisna Ltd | Wholesale & retail | 2025 |
| Harkess-Ord (USA) Limited | Professional & scientific | 1999 |
| Harkess-Ord Holdings Limited | Professional & scientific | 2001 |
| Harlee Management Company Limited | Households | 1982 |
| Harlequins Performing Arts LLP | | 2024 |
| Harlequins Theatre School Ltd | Administrative & support | 2016 |
| Harmar Editing Limited | Professional & scientific | 2019 |
| Harmonic AV Limited | Professional & scientific | 2016 |
| Harmonise YOU Ltd | Health & social care | 2026 |
| Harmonix Construction Group Limited | Financial services | 2025 |
| Harmonix Construction Limited | Construction | 1999 |
| Harmony Flow Care Ltd | Health & social care | 2025 |
| Harp Power Services Ltd | Other services | 2023 |
| Harris Scaffolding Services (UK) Limited | Other services | 2012 |
| Harrison Court Beckenham Grove Limited | Households | 2016 |
| Harrison-Page Limited | Real estate | 1958 |
| Harry Taylor Hvac Ltd | Construction | 2024 |
| Harry Taylor of Broadoak Limited | Professional & scientific | 1967 |
| Harry Taylor of Bromley Limited | Extraterritorial | 1975 |
| Harry Taylor of Sevenoaks Limited | Professional & scientific | 1967 |
| Harry Taylor Properties Limited | Professional & scientific | 1976 |
| Harryt Ltd | Extraterritorial | 2017 |
| Harslan Limited | Construction | 2025 |
| Hartfield Consultants Limited | Professional & scientific | 2024 |
| Hartley Court (Mitcham) Management Limited | Households | 1991 |
| Hartley House Limited | Health & social care | 2014 |
| Harts Lane (Block J) Management Co. Limited | Households | 1986 |
| Harvey Knight Property Holdings Limited | Real estate | 2023 |
| Harvey Mead & Co Limited | Professional & scientific | 2010 |
| Harveyhaircare Limited | Professional & scientific | 2022 |
| Harvington Lodge Limited | Households | 2021 |
| Harvington Lodge Management Ltd | Households | 2023 |
| Harwood Research Limited | Professional & scientific | 2008 |
| Has-Learned! Limited | Education | 2018 |
| Hasell Park Place Management Company Limited | Real estate | 2019 |
| Hasgood Limited | Households | 1984 |
| Hashim & Sons Ltd | Wholesale & retail | 2021 |