| Higgaboom Ltd | Professional & scientific | 2013 |
| Higgins Homes and Developments Limited | Real estate | 2015 |
| High Garden Estates Ltd | Real estate | 2022 |
| High-Flow Exhaust Ltd | Wholesale & retail | 2025 |
| Higher Thoughts Limited | Administrative & support | 2012 |
| Highfield Day Nursery Ltd | Education | 2026 |
| Highflyers Limited | Arts & recreation | 2025 |
| Highland Leisure Holdings Limited | Arts & recreation | 2018 |
| Highmoor Properties Limited | Real estate | 1994 |
| Highview Hills Limited | Hospitality | 2010 |
| Highview Management Company Ltd | Real estate | 2015 |
| HIJ Sales Quality Limited | Wholesale & retail | 2014 |
| Hilal Organics & NUR Therapies Ltd | Wholesale & retail | 2019 |
| Hill's Garages (Woodford) Limited | Wholesale & retail | 1945 |
| Hillington Investments Ltd | Professional & scientific | 2019 |
| Hillkrest Limited | Administrative & support | 2017 |
| Hills Developments (UK) Limited | Construction | 1955 |
| Hills Group Enterprises Limited | Professional & scientific | 2002 |
| Hilt Group Limited | Arts & recreation | 2018 |
| Hitech Consulting Limited | Administrative & support | 1993 |
| Hive Plumbing & Heating Limited | Construction | 2019 |
| HJS Construction Services Ltd | Professional & scientific | 2023 |
| Hkgn Properties Ltd | Real estate | 2026 |
| HM Engineering Ltd | Construction | 2014 |
| HMF Group Ltd | Education | 2024 |
| HML Handover Management Limited | Administrative & support | 2011 |
| HMZ Herbal Limited | Professional & scientific | 2020 |
| HND OPS Limited | Hospitality | 2025 |
| HNH Communications Limited | Administrative & support | 2017 |
| Hnpar Limited | Real estate | 2025 |
| Ho&Ash Limited | Construction | 2020 |
| Hoban Financial Planning Ltd | Professional & scientific | 2011 |
| Hobiss Ltd | Wholesale & retail | 2017 |
| Holbrook Engineering Limited | Construction | 2003 |
| Holiday Centar Limited | Administrative & support | 2025 |
| Holistic Medicals Ltd | Health & social care | 2020 |
| Holistic Sustainability Ltd | Professional & scientific | 2014 |
| Holly Court Spice Ltd | Hospitality | 2019 |
| Hollyhocks Management Company Limited | Households | 1986 |
| Holmecroft Management Limited | Real estate | 2021 |
| Home - the Management Company Limited | Arts & recreation | 1998 |
| Home Cinema Rooms Ltd | Professional & scientific | 2017 |
| Home Country Ltd | Other services | 2024 |
| Home Oasis Limited | Real estate | 2026 |
| Home Security Services Ltd | Administrative & support | 2024 |
| Home Sight UK Ltd | Health & social care | 2010 |
| Home Superstore Limited | Wholesale & retail | 2025 |
| Home: Production Music Ltd | Arts & recreation | 2018 |
| Home: the Music Company Limited | Information & communication | 2018 |
| Homebuild Projects & Infrastructure Limited | Construction | 2024 |
| Homevisor Ltd | Construction | 2019 |
| Homeware Products Online Limited | Wholesale & retail | 2021 |
| Homm Developments Limited | Real estate | 2023 |
| Honey I'M Home Coffee Ltd | Hospitality | 2023 |
| Hoopsa Entertainment Limited | Information & communication | 2019 |
| HOP Music Limited | Arts & recreation | 2020 |
| Hope LODGE(2 High Road,Woodford)Limited | Households | 1961 |
| Hopskotch Childrens Trust | Wholesale & retail | 2008 |
| Horace London Ltd | Wholesale & retail | 2025 |
| Horizen Consultancy Limited | Information & communication | 2014 |
| Hornbeam Labs Limited | Real estate | 2011 |
| Hornchurch Business Improvement District Limited | Public administration | 2025 |
| Hornlink Digital Ltd | Professional & scientific | 2026 |
| Hornsey Architectural Mouldings Ltd | Construction | 2019 |
| Horse & Well Ltd | Hospitality | 2012 |
| Hosken Optical Ltd | Professional & scientific | 2023 |
| Hosted Haven Ltd | Hospitality | 2023 |
| Hotels Quality Cleaning Ltd | Other services | 2025 |
| House of Alistair Limited | Administrative & support | 2009 |
| House of Hearts Limited | Other services | 2017 |
| House of Interiors Ltd | Other services | 2022 |
| House of Selected Ltd | Other services | 2024 |
| House of Tome Limited | Professional & scientific | 2016 |
| House of Trumper Ltd | Professional & scientific | 2016 |
| House of Verge Ltd | Information & communication | 2021 |
| Housefix Direct Ltd | Wholesale & retail | 2025 |
| Housefix Ltd | Wholesale & retail | 2025 |
| Housemate Productions Ltd | Information & communication | 2024 |
| Housing & Support UK Ltd | Real estate | 2023 |
| HOW Limited CIC | Administrative & support | 2026 |
| Howse Group Ltd | Real estate | 2020 |
| Hoyland & Mathews Fine Art Limited | Wholesale & retail | 2013 |
| HP Data AI Consultants Ltd | Information & communication | 2025 |
| HP Holdings (London) Limited | Financial services | 2022 |
| HPK Global Ltd | Transport & logistics | 2023 |
| HR Tech Solutions Limited | Manufacturing | 2018 |
| HRA Property Investments Ltd | Real estate | 2025 |
| HS Agency Limited | Extraterritorial | 2016 |
| HSK Electrical Limited | Manufacturing | 2017 |
| HSL Hawk Systems Limited | Other services | 2017 |
| HTG Group Limited | Real estate | 2016 |
| Huds Tiling Merchandise Limited | Wholesale & retail | 2020 |
| Huds Tiling Services Limited | Construction | 2013 |
| Hugs and Tails Ltd | Other services | 2019 |
| Human First Rights CIC | Health & social care | 2026 |
| Humayun Enterprises Limited | Other services | 2025 |
| Humi Asif Ltd | Administrative & support | 2018 |
| Hunt Property Services Limited | Real estate | 2005 |
| Hunt Renovations Limited | Construction | 2017 |
| Hunter & Woodrow Ltd | Information & communication | 2010 |