| Handmade Marketing Limited | Professional & scientific | 2008 |
| Handn Investments One Limited | Real estate | 2021 |
| Handn Investments Two Limited | Real estate | 2021 |
| Hanna & Sons Caribbean Taste Ltd | Hospitality | 2020 |
| Hanuman Systems Limited | Wholesale & retail | 2023 |
| HARBOUR24 Ltd | Information & communication | 2026 |
| Harrington Gill & Associates Limited | Administrative & support | 2010 |
| Harry Burrows Limited | Arts & recreation | 2026 |
| Hartmann Mason Limited | Administrative & support | 2009 |
| Harts Lane (Block C) Management Co. Limited | Households | 1985 |
| Haste CC Ltd | Professional & scientific | 2020 |
| Hatchbury Limited | Construction | 2014 |
| Haus Maids Bishop's Stortford Ltd | Other services | 2019 |
| Haydens Heating Services Ltd | Construction | 2022 |
| Hayward Ventures Limited | Real estate | 2022 |
| HB Metal Recycling Limited | Wholesale & retail | 2025 |
| Head Surridge Property Limited | Real estate | 2019 |
| Heath Estate Services Ltd | Construction | 2018 |
| Heath Financial Planning Limited | Professional & scientific | 2013 |
| Heatline Renewables Ltd | Construction | 2020 |
| Heavy Metal Welding Co Limited | Manufacturing | 2014 |
| Heckfords Road Great Bentley Ltd | Real estate | 2017 |
| Heckfords Road Great Bentley Management Company Limited | Real estate | 2018 |
| Hedgeview Developers Limited | Construction | 2018 |
| HEF Fire and Security Ltd | Administrative & support | 2025 |
| HEF Fire Protection Ltd | Construction | 2023 |
| HEF Properties Limited | Real estate | 2020 |
| HEF Services Ltd | Construction | 2007 |
| Hello YOU Consultancy Ltd | Professional & scientific | 2021 |
| Helpful EA Ltd | Administrative & support | 2020 |
| Hemto Limited | Wholesale & retail | 2019 |
| Hereward Green Management Company Limited | Households | 1984 |
| Herons Court Management Limited | Households | 1985 |
| Hertford Gates Limited | Construction | 2019 |
| HGC Accountancy Services Limited | Professional & scientific | 2009 |
| Hide Distribution Limited | Administrative & support | 2015 |
| High Drive Recruitment Limited | Construction | 2011 |
| High Mount Properties(Ilford)Limited | Professional & scientific | 1965 |
| High Road Leytonstone "a" Flat Management Limited | Households | 1987 |
| High Road Leytonstone "B" Flat Management Limited | Households | 1987 |
| High Road Leytonstone "C" Flat Management Limited | Households | 1987 |
| High Road Leytonstone "D" Flat Management Limited | Households | 1987 |
| High Road Leytonstone "E" Flat Management Limited | Households | 1987 |
| High Wych Curries Ltd | Administrative & support | 2017 |
| Highview Court (Loughton) Limited | Households | 1993 |
| Hillgreen Contractors Limited | Construction | 2023 |
| Hillhurl Assets Ltd | Other services | 2022 |
| Hillhurl Holdings Ltd | Financial services | 2022 |
| Hillhurl Joinery Ltd | Manufacturing | 2022 |
| Hills French Polishing Limited | Other services | 2022 |
| HJH Golf Limited | Arts & recreation | 2022 |
| Hlle Ltd | Administrative & support | 2024 |
| Holdbrook Way Residents Company Limited | Households | 2000 |
| Home Comforts Developments Limited | Real estate | 2020 |
| Homefolk Retail Limited | Wholesale & retail | 2021 |
| Homes by L&R Ltd | Real estate | 2020 |
| Horizon Facades Ltd | Construction | 2018 |
| Hot Doors Limited | Wholesale & retail | 2016 |
| Hotdoors.Co.Uk Limited | Extraterritorial | 2016 |
| House Plants Direct Ltd | Wholesale & retail | 2026 |
| HR Consult and Recruit Limited | Administrative & support | 2015 |
| Hudson Edge Ltd | Wholesale & retail | 2023 |
| Huff Investments Ltd | Real estate | 2026 |
| Hunters Brook Kitchens Limited | Construction | 2014 |
| Hyde Park Storage Ltd | Other services | 2020 |
| I&W Faith Properties Ltd | Real estate | 2023 |
| I-Commodity Limited | Construction | 2014 |
| I.A.G Properties Ltd | Real estate | 2024 |
| I.D. Barnard Ltd | Construction | 1997 |
| IAN Carr Enterprises Limited | Professional & scientific | 2012 |
| Icraft Developments Limited | Construction | 2024 |
| IG Balan Ltd | Construction | 2026 |
| IJR Plumbing and Heating Services Ltd | Construction | 2023 |
| Illumination Lighting Limited | Information & communication | 2021 |
| Imaginators Limited | Administrative & support | 1999 |
| Imperial Build Ltd | Construction | 2023 |
| Inclusivity Global Ltd | Other services | 2007 |
| Independent Asphalt Supplies Ltd | Construction | 2026 |
| Independent Asphalt Supply’S Ltd | Construction | 2022 |
| Independent Plant Hire Limited | Construction | 2022 |
| ING Draper Limited | Professional & scientific | 2021 |
| Ingold Consulting Ltd | Information & communication | 2017 |
| Ingrave Engineering Ltd | Professional & scientific | 2010 |
| Innovate Technology Holdings Ltd | Financial services | 2025 |
| Innovate Technology Services Ltd | Wholesale & retail | 2019 |
| Inside OUT Studios Limited | Arts & recreation | 2018 |
| Inside Talent Limited | Administrative & support | 2024 |
| Inspyer Lighting Ltd | Wholesale & retail | 2010 |
| Interface Communication Solutions Limited | Information & communication | 1997 |
| Interglass Limited | Manufacturing | 2016 |
| Internal Arts Ltd | Arts & recreation | 2020 |
| Inzinc Roofing & Cladding Ltd | Construction | 2023 |
| IPT Schools Limited | Administrative & support | 2021 |
| Iron Horse Ltd | Administrative & support | 2025 |
| IT1 Express Ltd | Information & communication | 2018 |
| ITH Investments Ltd | Real estate | 2024 |
| ITH Services Ltd | Professional & scientific | 2024 |
| IVY & Co Holdings Ltd | Real estate | 2026 |
| IVY & Co Properties Ltd | Real estate | 2026 |
| IVY Developments Ltd | Construction | 2024 |