| Gymme Ltd | Wholesale & retail | 2024 |
| H & P Conservationworks Limited | Administrative & support | 2007 |
| H J Kullar Ltd | Real estate | 2021 |
| H W S Contractors Ltd | Construction | 2019 |
| H.J.R Estates Ltd | Real estate | 2021 |
| H.U.B. Southeast Limited | Construction | 2018 |
| H2 Surveying Services Limited | Construction | 2016 |
| H2O-FLOW Ltd | Water & waste | 2019 |
| Hamad Everon Properties Limited | Real estate | 2023 |
| Hamad Properties Dartford Ltd | Real estate | 2019 |
| Hamalex Ltd | Wholesale & retail | 2021 |
| Hamer Fire and Security Ltd | Administrative & support | 2026 |
| Hammerton Close Residents Bexley Ltd | Households | 2021 |
| Hammond Properties Investments 2 Ltd | Real estate | 2023 |
| Hammond Properties Investments Ltd | Real estate | 2020 |
| Hammond Properties Management Ltd | Real estate | 2016 |
| Hammond Properties Ventures Ltd | Other services | 2022 |
| Hana Capital 1 Ltd | Financial services | 2023 |
| Hana Capital Holdings Ltd | Financial services | 2022 |
| Hana Capital Ltd | Financial services | 2020 |
| Hana HMO Ltd | Real estate | 2021 |
| HANA1 Ltd | Real estate | 2021 |
| Handybatch Ltd | Construction | 2010 |
| Hangzhou CLO Sourcing Ltd | Wholesale & retail | 2026 |
| Hannabuss Plumbing & Heating Ltd | Construction | 2014 |
| Harmanwood Limited | Other services | 2016 |
| Harryliv Interiors Ltd | Manufacturing | 2024 |
| Hartford Limited | Hospitality | 2023 |
| Hartford Property Development Limited | Construction | 2018 |
| Hartley Wallace Property Limited | Real estate | 2016 |
| Harvey Walker Limited | Construction | 2016 |
| Hatch Plumbing & Heating Installations Limited | Construction | 2017 |
| Hathor Construction Limited | Construction | 2025 |
| Hawre Services Limited | Professional & scientific | 2025 |
| Hayes Engineering (Erith) Ltd | Wholesale & retail | 2018 |
| Hayne Court MGT. Limited | Households | 2003 |
| Hayshine (Newco) Limited | Extraterritorial | 2016 |
| Hayshine Limited | Wholesale & retail | 1981 |
| Hazz Investments Limited | Administrative & support | 2021 |
| HBJ Services Limited | Construction | 2020 |
| Hbros Finance Ltd | Real estate | 2012 |
| Hbros Investments Ltd | Real estate | 2014 |
| HD2 Care Support Services Ltd | Health & social care | 2014 |
| Headquarter London Ltd | Other services | 2020 |
| Headriver Silverspoon Limited | Hospitality | 2023 |
| Health's Angels Limited | Health & social care | 2006 |
| Healthbiom Ltd | Professional & scientific | 2024 |
| Healthdek Ltd | Wholesale & retail | 2018 |
| Hear Clear EAR Microsuction Ltd | Health & social care | 2022 |
| Heat & Power Ltd | Construction | 2026 |
| Heat Heroes Limited | Construction | 2006 |
| Heat Providers Ltd | Wholesale & retail | 2020 |
| Heath Estates Property Services Limited | Real estate | 2014 |
| Heathcroft Service Charges Limited | Real estate | 2010 |
| Heathfield and Mayfield Management Co Limited | Households | 1994 |
| Heating Hero's London Limited | Construction | 2026 |
| Heatplumb Services Limited | Construction | 2018 |
| Heatstar Plumbing & Heating Services Ltd | Construction | 2015 |
| Height H1 Limited | Administrative & support | 2016 |
| Helm Investments Limited | Real estate | 2023 |
| Hemnit Ltd | Other services | 2008 |
| Henleys Manor Freehold Owners Limited | Households | 2019 |
| Hepakkes Engineering Limited | Information & communication | 2026 |
| Herbert Baseby Limited | Real estate | 2024 |
| Heritage Promise Limited | Hospitality | 2013 |
| Herne Court Flats Management Company Limited | Households | 2011 |
| Hexxa Ltd | Real estate | 2025 |
| HFP IT Consultancy Ltd | Information & communication | 2026 |
| HGB Facilities Ltd | Construction | 2019 |
| Hhomeconcepts Ltd | Construction | 2021 |
| HI - Residential Limited | Real estate | 2016 |
| Hickland Ltd | Real estate | 2026 |
| Hickwell Ltd | Hospitality | 2022 |
| Highbury Digital Ltd | Professional & scientific | 2025 |
| Hilder and Family Ltd | Real estate | 2022 |
| Hillvalley Property Group Limited | Real estate | 2017 |
| Hirehuntz Ltd | Professional & scientific | 2024 |
| Hive Education Group Limited | Education | 2022 |
| HJ Tenger Leamington Ltd | Real estate | 2018 |
| HL Investments Ltd | Real estate | 2015 |
| HNK Associates Ltd | Real estate | 2013 |
| Hogben Homes & Developments Ltd | Real estate | 2025 |
| Hogg & Price Limited | Wholesale & retail | 2004 |
| Holden Avenue Properties Ltd | Real estate | 2018 |
| Holeshot PR Limited | Administrative & support | 2006 |
| Holgate Properties Limited | Construction | 2001 |
| Holgate Residential Limited | Real estate | 2019 |
| Holistic Thinking Company Limited | Administrative & support | 2010 |
| Holistic Thinking Holiday Lets Limited | Hospitality | 2023 |
| Holistic Thinking Holidays Limited | Real estate | 2022 |
| Holland House Management Limited | Real estate | 2000 |
| Holland Windows Limited | Manufacturing | 2024 |
| Holly Lodge (Bexley) Management Company Limited | Households | 2003 |
| Holmbury Home Improvements Ltd | Construction | 2022 |
| Home Alone Ltd | Real estate | 2020 |
| Home and Safety Services Ltd | Construction | 2024 |
| Home Property Developer's Limited | Construction | 2020 |
| Homeland Realty Ltd | Real estate | 2021 |
| Hook Survey Limited | Professional & scientific | 2022 |
| Hoplon Protection Services Ltd | Administrative & support | 2020 |