| High Line Performance Limited | Health & social care | 2016 |
| High Oaks Estate (Inns) Limited | Hospitality | 2025 |
| High Performance Technologies Ltd | Professional & scientific | 2013 |
| High Rollers Club Ltd | Education | 2018 |
| High Violet Property Limited | Real estate | 2014 |
| High-Tech Solutions Ltd | Information & communication | 2016 |
| Highams Capital Limited | Other services | 2024 |
| Highbury Renovations and Restoration Ltd | Construction | 2025 |
| Highest Vibes Ltd | Professional & scientific | 2023 |
| Highfern Properties Limited | Real estate | 2006 |
| Highfield Suites Limited | Real estate | 2022 |
| Highfields Road (Highfields Caldecote) Management Company Ltd | Households | 2018 |
| Highgrove Construction Limited | Construction | 2010 |
| Highland Retail Solutions Ltd | Professional & scientific | 2017 |
| Highlands Furniture Restoration Company Limited | Other services | 2021 |
| Highoaks Estate Limited | Real estate | 2024 |
| Highview Property Management Co Ltd | Households | 2016 |
| Highwall Security Solutions Ltd | Wholesale & retail | 2025 |
| Higrange Consulting Limited | Wholesale & retail | 2002 |
| Hill Bingham Ltd | Professional & scientific | 2016 |
| Hill Farm Chelmsford Limited | Real estate | 2016 |
| Hill Farm Developments Limited | Administrative & support | 2007 |
| Hill Farm Investments Limited | Real estate | 2021 |
| Hill House Developments (Colchester) Limited | Construction | 2023 |
| Hillfort Limited | Construction | 2005 |
| Hillhouse Investment & Development Limited | Construction | 2006 |
| Hills Fleet Cleaning Ltd | Wholesale & retail | 2024 |
| Hills Jarrett TXS Limited | Professional & scientific | 2018 |
| Hills of Shoeburyness Limited | Manufacturing | 1960 |
| Hillsidelandscapers Limited | Administrative & support | 2026 |
| Hillsight Limited | Information & communication | 2014 |
| Hillton Dentistry Gillingham Limited | Health & social care | 2010 |
| Hilltop Padel Limited | Arts & recreation | 2025 |
| Hillview Accounting Services Limited | Professional & scientific | 2004 |
| Himalaya Gurkha Ltd | Hospitality | 2017 |
| Hintlesham Golf Club Limited | Arts & recreation | 2006 |
| HIP Switch Limited | Health & social care | 2026 |
| Hire Beyond Borders Ltd | Administrative & support | 2024 |
| Hireworx Limited | Agriculture & fishing | 2023 |
| HIS Kingdom Properties Ltd | Real estate | 2025 |
| HIS Nibs Limited | Manufacturing | 1997 |
| Historic Records Limited | Information & communication | 2023 |
| Hivan Limited | Professional & scientific | 2000 |
| Hive and Citrus Ltd | Manufacturing | 2026 |
| Hive Family of Schools | Education | 2012 |
| Hivelocity Growth Limited | Information & communication | 2021 |
| Hivemind Trailer Music and Sound Ltd | Information & communication | 2019 |
| HJ MAN Associates LLP | | 2026 |
| HJ MAN Ltd | Real estate | 2025 |
| HJR Macklin Property Services Limited | Real estate | 2024 |
| HKB Properties Limited | Real estate | 2017 |
| HKL Electrical Contractors Limited | Construction | 2021 |
| Hkraj Ltd | Wholesale & retail | 2022 |
| HKT Automation Ltd | Wholesale & retail | 2025 |
| HL Recruit Ltd | Administrative & support | 2024 |
| HLK Capitals Ltd | Transport & logistics | 2024 |
| HMA Setting OUT Services Limited | Professional & scientific | 2013 |
| HMB Aerospace Limited | Transport & logistics | 2017 |
| HMB Cleaning Services Ltd | Administrative & support | 2024 |
| HMB Property Services Limited | Administrative & support | 2023 |
| HMC Consultants Ltd | Administrative & support | 2012 |
| Hmpi Capital Ltd | Real estate | 2024 |
| Hockley Contract Services Ltd | Construction | 2021 |
| Hockley Painting Limited | Construction | 2022 |
| Hockley Smiles Ltd | Health & social care | 2021 |
| Hodfamco Limited | Professional & scientific | 2025 |
| Hodges Tax Returns Ltd | Professional & scientific | 2024 |
| Hodsons Commercial Property Ltd | Financial services | 2023 |
| Hodsons Homes Ltd | Real estate | 2024 |
| Hogarth Chambers Services Limited | Professional & scientific | 2001 |
| Hogg & Co Business Partners Ltd | Administrative & support | 2026 |
| HOL Tiptree Prop (SPV) Ltd | Real estate | 2023 |
| Hold the Pony Ltd | Wholesale & retail | 2020 |
| Holistic Marketing Productions Ltd | Information & communication | 2025 |
| Holland Outdoor Plants Import Ltd | Wholesale & retail | 2020 |
| Holland Park View Limited | Households | 2025 |
| Hollands Finishes Ltd | Construction | 2017 |
| Hollick Property Holdings Limited | Construction | 2024 |
| Hollies Crescent Road RTM Company Limited | Households | 2020 |
| Hollow Tree Property Limited | Professional & scientific | 2003 |
| Holly Investments Ltd | Real estate | 2015 |
| Holly Trees Montessori Limited | Health & social care | 2018 |
| Hollyhocks Parties Ltd | Arts & recreation | 2024 |
| Holmes & Haylock Limited | Real estate | 2014 |
| Holmes Corporation Limited | Professional & scientific | 2022 |
| Holmes Holdings Investments Limited | Real estate | 2001 |
| Holmes Industries Limited | Professional & scientific | 2022 |
| Holmes Land Holdings Limited | Real estate | 2001 |
| Holmescorp Limited | Professional & scientific | 2022 |
| Holytex Limited | Wholesale & retail | 2008 |
| Holz Limited | Construction | 2014 |
| Hombs Limited | Administrative & support | 2024 |
| Home City Properties Ltd | Real estate | 2023 |
| Home County Windows Limited | Construction | 2002 |
| Home Finance Advice Direct and Life Limited | Financial services | 2010 |
| Home Financial Consultants (Chelmsford) LP | | 1994 |
| Home Foods G Ltd | Wholesale & retail | 2024 |
| Home Proud Exterior Services Limited | Administrative & support | 2025 |
| Home Repairs and Upgrades Limited | Construction | 2016 |
| Homefront Wellbeing Professionals Ltd | Health & social care | 2026 |