| Hakim Services Ltd | Construction | 2026 |
| Hakman & MC Limited | Information & communication | 2010 |
| Halcyon Care Partners Ltd | Administrative & support | 2025 |
| Halcyon Technologies Limited | Information & communication | 2025 |
| Haling Limited | Professional & scientific | 2008 |
| Hallal Benmira Ltd | Transport & logistics | 2026 |
| Hallmark Foods Ltd | Hospitality | 2025 |
| Hamd Investments Direct Ltd | Real estate | 2019 |
| Hamelinbay Ltd | Hospitality | 2023 |
| Hamidiye Ltd | Hospitality | 2024 |
| Hamilton Project Solutions Ltd | Professional & scientific | 2023 |
| Hamilton&Hanson Events Limited | Hospitality | 2024 |
| Hammond Solutions Essex Ltd | Administrative & support | 2014 |
| Hannah's Bakeries Ltd | Manufacturing | 1978 |
| Hannan Maintenance Services Limited | Construction | 2008 |
| Hannan Properties Ltd | Real estate | 2017 |
| Hansi Health Limited | Health & social care | 2016 |
| Hanson Consultant Ltd | Health & social care | 2024 |
| Happie Homes Ltd | Real estate | 2018 |
| Happy Foodbox Limited Ltd | Hospitality | 2026 |
| Happy Millions Limited | Financial services | 2023 |
| Haque Brothers Ltd | Real estate | 2025 |
| Harbor Catch Ltd | Wholesale & retail | 2026 |
| Hari Construction Limited | Construction | 2007 |
| Harlesden Technical Services Ltd | Construction | 2019 |
| Harley Reed International Limited | Administrative & support | 2008 |
| Harleys Hounds Ltd | Other services | 2025 |
| Harlow Royce Ltd | Professional & scientific | 2024 |
| Harman Shopfront Ltd | Construction | 2021 |
| Harmony Estate Homes Limited | Real estate | 2024 |
| Harmony Grace Ltd | Real estate | 2025 |
| Harold Consulting Ltd | Information & communication | 2020 |
| Harp Essex Limited | Arts & recreation | 2020 |
| Harry S Builders Limited | Construction | 2018 |
| Harwood Court (Kent Road) Management Company Limited | Households | 1997 |
| Hathaway Contractors Ltd | Construction | 2013 |
| Hatikal Ltd | Households | 2025 |
| Hats R. US Ltd | Wholesale & retail | 2023 |
| Hattens Solicitors Limited | Professional & scientific | 2021 |
| Haven @ Chafford Ltd | Real estate | 2025 |
| Haven UK Home Limited | Real estate | 2024 |
| Havilah Limited | Wholesale & retail | 2022 |
| Havilah Supported Living Limited | Health & social care | 2025 |
| Hawa Day Nursery Ltd | Education | 2025 |
| Hawk Accountax Ltd | Professional & scientific | 2021 |
| Hawk Facilities Management Ltd | Hospitality | 2021 |
| Hawken & Son’S Surveying Ltd | Professional & scientific | 2025 |
| Hawkins and Sahil Holdings Ltd | Real estate | 2024 |
| Haybrew Accounting Contractors Limited | Professional & scientific | 2004 |
| Haywards Automotive Limited | Wholesale & retail | 2018 |
| Hazelwood Haulage Limited | Transport & logistics | 2019 |
| Hcch Ltd | Construction | 2018 |
| HD Wired Ltd | Information & communication | 2025 |
| HDS Services Limited | Health & social care | 2020 |
| HE Reigns Prospects College UK Limited | Education | 2010 |
| Headley & Co Limited | Real estate | 2024 |
| Health From Nature Ltd | Manufacturing | 2024 |
| Healthy Afro Hair Ltd | Other services | 2009 |
| Healthy Drinks & Smoothie Ltd | Manufacturing | 2018 |
| Hear From the Field Experts Ltd | Information & communication | 2022 |
| Heat Style Plumbing and Heating Ltd | Construction | 2018 |
| Heath Flooring Contracts Ltd | Construction | 2021 |
| Heath News Enterprise Ltd | Wholesale & retail | 2026 |
| Heeter Limited | Construction | 2019 |
| Heinst Ltd | Real estate | 2021 |
| Hekuran Vucaj Engineering Limited | Professional & scientific | 2014 |
| Hekz London Ltd | Wholesale & retail | 2023 |
| Helabhoomi Products Ltd | Wholesale & retail | 2020 |
| Heley Holdings Limited | Professional & scientific | 2001 |
| Helhoughton Property Management Limited | Real estate | 2010 |
| Hello Zuzu Ltd | Wholesale & retail | 2025 |
| Help to Health Chiropractic Ltd | Health & social care | 2012 |
| Help Your Business Grow Ltd | Administrative & support | 2022 |
| Helping Hands Waste Management Ltd | Water & waste | 2026 |
| Henry DE Grey Close Limited | Real estate | 1998 |
| Herbody Fitness Ltd | Arts & recreation | 2026 |
| Herko Group Ltd | Construction | 2024 |
| Herko Ltd | Construction | 2020 |
| Hermina Trans Ltd | Transport & logistics | 2019 |
| Heron Property Management Ltd | Administrative & support | 2014 |
| Herts & Essex Residential Ltd | Real estate | 2021 |
| Hevsel Meze Restaurant Ltd | Hospitality | 2019 |
| HEY Baby 4D South East Group Limited | Health & social care | 2018 |
| Heylina AI Ltd | Information & communication | 2025 |
| Hgvalentin Limited | Transport & logistics | 2018 |
| Hgvpro Ltd | Wholesale & retail | 2026 |
| Hi-Power Electrical Solutions Limited | Construction | 2014 |
| High Mead Developments Limited | Manufacturing | 1998 |
| High Pitch Limited | Wholesale & retail | 2016 |
| High Service Cleaning Ltd | Administrative & support | 2019 |
| Highbury Enterprises Ltd | Financial services | 2008 |
| Highland Bayfield Ltd | Hospitality | 2023 |
| Highlander Construction Ltd | Construction | 2018 |
| Hildenratch Limited | Administrative & support | 2019 |
| Hill Farm Estates Limited | Real estate | 1987 |
| Hillborough Mansions RTM Company Limited | Real estate | 2009 |
| Hills Ventures Limited | Professional & scientific | 2012 |
| Hipox Limited | Wholesale & retail | 2020 |
| Hira Fatima Ltd | Wholesale & retail | 2025 |
| Hirebrid PCO Ltd | Transport & logistics | 2019 |