| Guest&Co Ltd | Hospitality | 2026 |
| Guildhall Properties Limited | Real estate | 2018 |
| GWS London Ltd | Other services | 2017 |
| Gymworx (UK) Ltd | Arts & recreation | 2022 |
| H & R Contractors Ltd | Construction | 2015 |
| Hadley Hall Developments Limited | Construction | 2020 |
| Hadley Hall Properties Limited | Construction | 2020 |
| Half Pint Fashion Ltd | Wholesale & retail | 2024 |
| Hamilton Heating Ltd | Construction | 2021 |
| Hamilton Piers Ltd | Real estate | 2020 |
| Handleys Farm Property Ltd | Real estate | 2020 |
| Happy Garden Great Dunmow Limited | Hospitality | 2024 |
| Happy Tails (Dunmow) Limited | Wholesale & retail | 2015 |
| Hards Butchers Limited | Wholesale & retail | 2014 |
| Harington Consulting Ltd | Administrative & support | 2013 |
| Harlow Plastering Limited | Real estate | 1990 |
| Harpen Consulting Limited | Professional & scientific | 2024 |
| Harpenden Carpentry Ltd | Construction | 2020 |
| Harrington Recruitment Ltd | Administrative & support | 2011 |
| Harris Containers Limited | Extraterritorial | 2026 |
| Harris Law Limited | Administrative & support | 2013 |
| Harris Squared Limited | Administrative & support | 2011 |
| Hashtagprintee Limited | Manufacturing | 2022 |
| Hawk Contracts Ltd | Information & communication | 2023 |
| Hawkins Business Associates Limited | Health & social care | 2017 |
| HB1 Fitness Ltd | Arts & recreation | 2019 |
| He@Heating Limited | Manufacturing | 2016 |
| Healy Web Design Limited | Information & communication | 2021 |
| Heartbond Ltd | Information & communication | 2018 |
| Hearts of Hope CIC | Health & social care | 2025 |
| Heat Wayv Ltd | Construction | 2024 |
| Heatech Services Group Limited | Construction | 2003 |
| Henry Ward Property Solutions Limited | Real estate | 2007 |
| Henry's Barber Shop Ltd | Other services | 2022 |
| Heritage Coach Trimming Ltd | Manufacturing | 2022 |
| Herts & Essex Dream Home Builders Limited | Construction | 2014 |
| Herts and Essex Website Services Ltd | Information & communication | 2013 |
| Hexagon Consulting Limited | Administrative & support | 2004 |
| Heyhill Land Limited | Professional & scientific | 2014 |
| Hfra Accounting and Taxation Services Ltd | Professional & scientific | 2009 |
| Hideaway Home Fragrances Ltd | Wholesale & retail | 2021 |
| High Rock Events Ltd | Other services | 2026 |
| High Roding Management Company Limited | Extraterritorial | 2017 |
| Higheq Limited | Information & communication | 2020 |
| Higher Powered Solutions Ltd | Administrative & support | 2012 |
| Highline Roadmarkings Ltd | Construction | 1998 |
| Higuera Property Limited | Professional & scientific | 2010 |
| Hills Housekeeping Limited | Administrative & support | 2018 |
| Hiltongrove Mastering Limited | Information & communication | 2005 |
| Hinterlanduk Limited | Professional & scientific | 2025 |
| Histopath Courses by DR Sultan Ltd | Information & communication | 2025 |
| HIX Art Limited | Arts & recreation | 2014 |
| HMF Property Developments Ltd | Construction | 2026 |
| Holben Ventures Limited | Wholesale & retail | 2024 |
| Holford & Clayton Investments Ltd | Real estate | 2024 |
| Holmbuild Limited | Construction | 2008 |
| Homing PIN Ltd | Other services | 2012 |
| Homingpin America Ltd | Other services | 2013 |
| Horizon Kitchens Limited | Manufacturing | 2002 |
| Hourston Properties Ltd | Real estate | 2023 |
| House of Admin Limited | Administrative & support | 2024 |
| House of Deborah J Ltd | Real estate | 2019 |
| HOX Group Developments Limited | Real estate | 2022 |
| Hprsonsdevelopments Ltd | Financial services | 2023 |
| Hrstats Limited | Professional & scientific | 2017 |
| Hses Investments Limited | Real estate | 2020 |
| Hugo Construction Ltd | Construction | 2010 |
| Hugo Developments Limited | Construction | 2017 |
| Hummingbird Products Ltd | Wholesale & retail | 2020 |
| Hunters Hair and Beauty Limited | Other services | 2009 |
| Huntingfields Solutions Ltd | Extraterritorial | 2022 |
| Hurricane Heating & Plumbing Limited | Construction | 2008 |
| Hwyl Productions Limited | Construction | 2018 |
| HYC Consultants Ltd | Construction | 2019 |
| Hyper Cooling Limited | Construction | 2006 |
| I F Smith Transport Ltd | Transport & logistics | 2020 |
| I Want More Clothing Ltd | Wholesale & retail | 2013 |
| I Wilson Roofing Ltd | Construction | 2026 |
| I-Home Control Ltd | Professional & scientific | 2016 |
| IAN Kerwin Building Ltd | Construction | 2020 |
| Idmj Group Limited | Hospitality | 2022 |
| Idyllic Food LLP | | 2018 |
| Ifms Austria Ltd | Other services | 2012 |
| Image Assess Ltd | Wholesale & retail | 2025 |
| IMPACT2 Performance Coaching Limited | Arts & recreation | 2015 |
| IN Plain Sight Limited | Professional & scientific | 2020 |
| INB Project Management Ltd | Information & communication | 2026 |
| Index LNE Ltd | Real estate | 2025 |
| Industrial Muscle Ltd | Arts & recreation | 2025 |
| Ineve Group Ltd | Professional & scientific | 2023 |
| Inman London Limited | Financial services | 2015 |
| Inspecting Metal Ltd | Professional & scientific | 2014 |
| INSTA80S90S Ltd | Information & communication | 2025 |
| Insyte Consulting Limited | Administrative & support | 2018 |
| Integrity Land Ltd | Construction | 2024 |
| Interknit Limited | Manufacturing | 2025 |
| Intra SAT Limited | Extraterritorial | 2017 |
| Inventoryonline Limited | Administrative & support | 2021 |
| Investment OWL Limited | Financial services | 2017 |
| Invita Construction Ltd | Construction | 2023 |