| Hayt Limited | Professional & scientific | 2013 |
| Haywards Court Residents Association Limited | Real estate | 2019 |
| HBC Accounting Ltd | Professional & scientific | 2024 |
| HCB Heating Ltd | Construction | 2018 |
| HDS Solutions Ltd | Other services | 2015 |
| Health Pulse Services Limited | Professional & scientific | 2019 |
| Heather Moodley Consulting Limited | Professional & scientific | 2023 |
| Heathfield Guest House Ltd | Hospitality | 2015 |
| Heaven Glitz Ltd | Information & communication | 2019 |
| Heaven Nails & Beauty Limited | Other services | 2021 |
| Heavybeast Rigging Ltd | Construction | 2026 |
| Hebron City Limited | Real estate | 2022 |
| Helen Court (Hendon Lane) Limited | Real estate | 1981 |
| Helen James IT Services Limited | Information & communication | 2015 |
| Helen-Marie Solutions Ltd | Hospitality | 2021 |
| Helena James Investment LLP | | 2023 |
| Hemhurst Technical Services Limited | Professional & scientific | 1983 |
| Hemmali Aesthetics Limited | Health & social care | 2024 |
| Henry Contracting Limited | Construction | 2025 |
| HER Beauty Limited | Other services | 2025 |
| Herba Nutrition Limited | Health & social care | 2021 |
| Hercules Cleaning Services Ltd | Administrative & support | 2024 |
| Herd Garden Designs Ltd | Wholesale & retail | 2019 |
| Heritage Craft Masonry Limited | Construction | 2020 |
| Heslam Investments Ltd | Financial services | 2022 |
| Hester Homes Land (Number 02) Ltd | Real estate | 2019 |
| Hestia Fire & Safety Systems Ltd | Administrative & support | 2025 |
| Hexters Booze Brothers Limited | Professional & scientific | 1994 |
| HEY Lets Travel UK Ltd | Information & communication | 2025 |
| Heyelink Security Ltd | Information & communication | 2019 |
| High Land & Property Group Ltd | Real estate | 2024 |
| High Maintenance (HS) Limited | Construction | 2017 |
| High Quality Rail Solutions Ltd | Construction | 2025 |
| High Temp Heating Solutions Ltd | Construction | 2024 |
| Highgrove FM Support Services Ltd | Administrative & support | 2023 |
| Hilton Manor Homes Limited | Construction | 2009 |
| Himalia Properties Limited | Real estate | 2021 |
| Hinxman Investments Ltd | Real estate | 2021 |
| Hipx Technologies Limited | Wholesale & retail | 2023 |
| Hizon Limited | Construction | 2019 |
| HJ Property Partners Limited | Real estate | 2024 |
| HJJ Alexander House Limited | Real estate | 2025 |
| HJJ Developments Ltd | Real estate | 2023 |
| HLH Consultants Ltd | Professional & scientific | 2026 |
| HMI Builders Ltd | Construction | 2026 |
| HMW Home Services Ltd | Construction | 2020 |
| Holistic Recruitment and Traning Agency Limited | Real estate | 2012 |
| Holo Ltd | Other services | 2023 |
| Home Boutique Ltd | Wholesale & retail | 2022 |
| Home Essentials Depot Ltd | Wholesale & retail | 2024 |
| Home Safe Renting Ltd | Real estate | 2018 |
| Homes AKJ Ltd | Real estate | 2025 |
| Homese Properties Limited | Households | 2019 |
| Hometech Ltd | Extraterritorial | 2017 |
| Hooked Fish Inn Ltd | Hospitality | 2024 |
| Hope Through Yoga C.I.C. | Health & social care | 2026 |
| Horizon Hotel Group Limited | Hospitality | 2018 |
| Horizon MED Ltd | Professional & scientific | 2025 |
| Horton Contracts Ltd | Professional & scientific | 2018 |
| Hothi Investments Limited | Real estate | 2022 |
| House of the Onion Theatre Company Ltd | Arts & recreation | 2024 |
| Household Division Motorcycle Club | Extraterritorial | 2015 |
| Housing Pro Limited | Construction | 2022 |
| Houze Limited | Administrative & support | 2018 |
| Howard FM Limited | Construction | 2020 |
| Hozera Care Limited | Wholesale & retail | 2013 |
| HP Pindoria 2 Limited | Wholesale & retail | 2013 |
| HPD Health Solutions Ltd | Health & social care | 2020 |
| HPS Life Ltd | Professional & scientific | 2024 |
| HRE Investments Ltd | Real estate | 2019 |
| HRE Property Ltd | Real estate | 2025 |
| HRM Building Designs Limited | Construction | 2014 |
| HSL Developments Limited | Construction | 2023 |
| Hub Distribution Limited | Wholesale & retail | 2018 |
| Huddle Marketing Limited | Professional & scientific | 2015 |
| Hudson & Batt Ltd | Education | 2024 |
| HUM Management Limited | Real estate | 2018 |
| Human Connect Ltd | Information & communication | 2017 |
| Hybrid Therapeutic Homes Limited | Health & social care | 2026 |
| Hypehair (Bermondsey) Limited | Other services | 2020 |
| I & S North Property Ltd | Real estate | 2026 |
| I-Lux Building Services Ltd | Professional & scientific | 2024 |
| I-Sea Holdings Limited | Real estate | 2021 |
| I.G. Flooring Services Limited | Construction | 2013 |
| Iamadamsullivan.Com Ltd | Information & communication | 2024 |
| IAN Garland Limited | Information & communication | 2018 |
| IAZ Property Ltd | Real estate | 2025 |
| Icon Property Bexley Limited | Real estate | 2024 |
| Idea-Resource Ltd | Information & communication | 2023 |
| Ideal Properties Solution Limited | Real estate | 2023 |
| Idealises Ltd | Public administration | 2025 |
| Idss Electrical Ltd | Construction | 2017 |
| IG Cleaning Services Ltd | Administrative & support | 2015 |
| Ikrish Limited | Financial services | 2017 |
| IKS Homes Ltd | Manufacturing | 2025 |
| ILLUMIN8 Electrical Solutions Limited | Construction | 2013 |
| Illuminate Minds Trust | Education | 2013 |
| IM Property Management Ltd | Real estate | 2017 |
| Image Directors Group Ltd | Wholesale & retail | 2018 |
| Immaculate Beauty by Helena Ltd | Other services | 2024 |