| Hinton House Estates Limited | Real estate | 2024 |
| Hinton Property Company Limited | Real estate | 2025 |
| Hiraeth Artist Agency Ltd | Arts & recreation | 2025 |
| Hire a Hall Limited | Arts & recreation | 2012 |
| Hire AMI Limited | Information & communication | 2025 |
| Hire Hub London Limited | Administrative & support | 2023 |
| Hire My Decor Ltd | Other services | 2015 |
| Hire the Bar Ltd | Hospitality | 2019 |
| Hiresteve Ltd | Information & communication | 2025 |
| Hiro Land Limited | Real estate | 2018 |
| Hiseb Ltd | Professional & scientific | 2019 |
| History Maker Foundation | Arts & recreation | 2010 |
| HIT A-U Limited | Financial services | 2018 |
| HJ Living Ltd | Wholesale & retail | 2026 |
| HJA Electrical Services Limited | Construction | 2023 |
| HK Dinning Ltd | Hospitality | 2018 |
| HK Faves Limited | Hospitality | 2024 |
| HK Plumbing and Heating Limited | Construction | 2020 |
| HKB Demolition Ltd | Construction | 2016 |
| HKC Delight Limited | Hospitality | 2024 |
| HKC Dining Limited | Hospitality | 2025 |
| HL7 Ancillary Systems Ltd | Information & communication | 2020 |
| HLC (Essex) Limited | Hospitality | 2024 |
| HM Adams Holdings Limited | Financial services | 2025 |
| HMD Auto Limited | Wholesale & retail | 2022 |
| Hmgc Consulting Ltd | Professional & scientific | 2023 |
| HMK Plumbing Services Ltd | Construction | 2020 |
| Hmkeys Ltd | Construction | 2025 |
| HMR Linings Ltd | Construction | 2021 |
| HMS Groundworks Ltd | Construction | 2009 |
| HMS Machinery Ltd | Administrative & support | 2022 |
| HNB Properties Limited | Real estate | 2007 |
| Hngh Ltd | Professional & scientific | 2024 |
| Hnsl Pensions Limited | Financial services | 2014 |
| HO French Homes Ltd | Real estate | 2015 |
| Hobart Gardens Colchester Management Company Limited | Households | 2012 |
| Hobas Colchester Limited | Households | 2022 |
| Hobbs Estates Ltd | Agriculture & fishing | 1958 |
| Hobbs Read Limited | Construction | 2015 |
| Hobsons Deli and Cafe Ltd | Hospitality | 2025 |
| Hockley Place Limited | Other services | 2021 |
| Hockney Hospitality Ltd | Hospitality | 2026 |
| HOE Mill Developments Limited | Construction | 2017 |
| Hofdds Ltd | Health & social care | 2019 |
| Hoggarth Cooke Partnership Limited | Professional & scientific | 2015 |
| Hogit Ltd | Hospitality | 2017 |
| Hogland UK Ltd | Wholesale & retail | 2023 |
| HOI Polloi Logistics Ltd | Transport & logistics | 2006 |
| Hold Investment Company Limited(The) | Real estate | 1961 |
| Holden Build Ltd | Construction | 2018 |
| Holden Carpentry Ltd | Construction | 2014 |
| Holden Financial Services Ltd | Administrative & support | 2019 |
| Holding Down Bolts Ltd | Extraterritorial | 2018 |
| Holiday Cottage Co Essex Ltd | Hospitality | 2017 |
| Holistic Balance Therapy Ltd. | Health & social care | 2024 |
| Holistic Recruiters Limited | Administrative & support | 2013 |
| Holistrix Ltd | Information & communication | 2018 |
| Holland & Holland Investments SPV Limited | Real estate | 2024 |
| Holland Lodge RTM Company Limited | Households | 2018 |
| Holland Mowers & Garden Machinery Ltd | Other services | 2018 |
| Holland Place Company Limited | Households | 1986 |
| Holland Resources Consulting Limited | Administrative & support | 2019 |
| Holland Roofing Limited | Construction | 2023 |
| Hollingsworth Collective Limited | Professional & scientific | 2026 |
| Hollingsworth Decorators Limited | Construction | 2003 |
| Holliwell Close Management Company Limited | Households | 1998 |
| Holloway Student Homes Limited | Real estate | 2017 |
| Holly Farm Close (Frating) Management Company Limited | Households | 2026 |
| Holly Villa Property Limited | Real estate | 2024 |
| Hollyhock Homes Limited | Real estate | 2023 |
| Hollyray Limited | Information & communication | 2025 |
| Hollywood Farm Ltd | Agriculture & fishing | 2014 |
| Hollywood Nails Studio HB Ltd | Other services | 2026 |
| Holman Electrical Services Limited | Construction | 2018 |
| Holmax Consulting Ltd | Professional & scientific | 2019 |
| Holme Oak Developments Ltd | Construction | 2020 |
| Holme Oak Lettings Ltd | Real estate | 2024 |
| Holmes & Hills LLP | | 2010 |
| Holmes Groundwork and Construction Limited | Construction | 2021 |
| Holmes Storage & Logistics Limited | Transport & logistics | 2025 |
| Holtom Associates Limited | Health & social care | 2006 |
| Holy Hill Ltd | Real estate | 2022 |
| Holy Spirit Care Limited | Health & social care | 2019 |
| Homa Design Limited | Professional & scientific | 1990 |
| Home & Building Maintenance & Repairs Ltd | Administrative & support | 2015 |
| Home Choice Kitchens Limited | Other services | 2017 |
| Home Direction Limited | Extraterritorial | 2014 |
| Home Food Direct Ltd | Wholesale & retail | 2017 |
| Home Outdoor Ltd | Wholesale & retail | 2015 |
| Home to Rent Limited | Administrative & support | 2009 |
| Home-Start Colchester, Jaywick & Clacton | Other services | 2006 |
| Homeaspect Property Management Limited | Households | 1994 |
| Homebridge Manor Management Company Limited | Households | 2015 |
| Homeclean Colchester Ltd | Administrative & support | 2025 |
| Homefield Grange Limited | Health & social care | 2011 |
| Homefield Properties Limited | Real estate | 2013 |
| Homepal Pathways Residential Ltd | Health & social care | 2025 |
| Homereno UK Limited | Construction | 2025 |
| Homes by Mona Ltd | Real estate | 2025 |
| Homestay Investments Ltd | Households | 2023 |