| HDR Investment Ltd | Real estate | 2023 |
| Heal in Ltd | Wholesale & retail | 2020 |
| Healflow Ltd | Health & social care | 2025 |
| Health & Social Connect Multi-Media Limited | Health & social care | 2016 |
| Health and Well Being Complementary Centre Limited | Health & social care | 2019 |
| Health Education Livelyhood Agriculture Climate Change for Ghana (Helac) Ltd | Agriculture & fishing | 2022 |
| Health Innovation Consultancy Limited | Health & social care | 2024 |
| Healthcare Quality Care Ltd | Health & social care | 2023 |
| Healthmatix Limited | Information & communication | 2016 |
| Healthy Body Consultants Ltd | Other services | 2023 |
| Healthyish Cake Ltd | Manufacturing | 2019 |
| Healy Real Estate Ltd | Real estate | 2021 |
| Hear for ALL Ltd | Health & social care | 2014 |
| Heargain Microsuction Limited | Health & social care | 2022 |
| Heart of Enfield CIC | Education | 2019 |
| Heartfelt Hands Therapies CIC | Health & social care | 2020 |
| Heartfeltcarecompany Ltd | Households | 2026 |
| Heartwork Services Ltd | Professional & scientific | 2016 |
| Heather Drive Management Limited | Households | 1984 |
| Heathfield Court (London SW18) Management Limited | Households | 1991 |
| Heatify London Ltd | Wholesale & retail | 2025 |
| Heating & Bathroom Supplies Limited | Wholesale & retail | 2001 |
| Heating&Build Limited | Construction | 2019 |
| Heaven House Properties Ltd | Financial services | 2024 |
| Heaven Nails & Hair Salon Ltd | Other services | 2016 |
| Heavenstone Properties Ltd | Real estate | 2025 |
| Heckingbottom Learning Limited | Education | 2016 |
| Hedg Limited | Other services | 2010 |
| Heggi Trade Ltd | Wholesale & retail | 2025 |
| Heidari Pharma Limited | Health & social care | 2024 |
| Heiler Tech Ltd | Information & communication | 2023 |
| HEL Hydraulic Engineering Limited | Professional & scientific | 2003 |
| Helig Drive Limited | Extraterritorial | 2013 |
| Heliostar Ltd | Manufacturing | 2019 |
| Hello Beauty Clinic Ltd | Other services | 2022 |
| Hello Winngoo Ltd | Information & communication | 2021 |
| Hellobobauk Limited | Hospitality | 2022 |
| Helping Hands Property Solutions Ltd | Real estate | 2025 |
| Helping Souls Welfare Ltd | Health & social care | 2020 |
| HEM Consulting Limited | Financial services | 2021 |
| Hengtan Chen Ltd | Hospitality | 2020 |
| Henley Finance Ltd | Financial services | 2012 |
| Henry & KEN Company Ltd | Wholesale & retail | 2022 |
| Henrydivine Company Limited | Public administration | 2018 |
| Hensoldt UK Limited | Professional & scientific | 2007 |
| HER Beauty Studio Ltd | Other services | 2015 |
| HER Own Clothing Ltd | Wholesale & retail | 2020 |
| Hera Fit & Well Ltd | Health & social care | 2022 |
| Hera Studio Ltd | Other services | 2024 |
| Herberts of Enfield Ltd | Wholesale & retail | 2025 |
| Herbl Ltd | Manufacturing | 2018 |
| Hercules Nutrition Ltd | Wholesale & retail | 2021 |
| Hercules Sports Club Limited | Arts & recreation | 2020 |
| Heriots Coffee Limited | Wholesale & retail | 2020 |
| Heriots Lakeside Ltd | Wholesale & retail | 2021 |
| Heritage Heights Roofing Ltd | Construction | 2025 |
| Hermanos Foods Ltd | Hospitality | 2025 |
| Hermanos Tattoos Ltd | Other services | 2025 |
| Hermes Marketing (UK) Limited | Other services | 2014 |
| Hero and Leander Limited | Extraterritorial | 2015 |
| Heron Mead (Enfield Lock) Residents Company Limited | Households | 2001 |
| Hertfordshire School of Language Ltd | Education | 2024 |
| Herts Drywall Specialist Ltd | Construction | 2019 |
| Herts Logistics Ltd | Transport & logistics | 2026 |
| Hertsecure Logistics Limited | Transport & logistics | 2025 |
| Hertslet RD Ltd | Real estate | 2023 |
| Hertslet RD Management Ltd | Real estate | 2024 |
| Herve and SON Limited | Construction | 2025 |
| Hevsel Limited | Hospitality | 2025 |
| Heysmile Limited | Wholesale & retail | 2020 |
| Hfhav Limited | Real estate | 2025 |
| HG Accountants Ltd | Professional & scientific | 2021 |
| HGI Civil and Structural Engineering Limited | Professional & scientific | 2017 |
| HHA Marketing and Sales Limited | Professional & scientific | 2020 |
| Hhcw Ltd | Real estate | 2024 |
| Hi-Tech Cleaning Specialists Ltd | Administrative & support | 2019 |
| Hibernia Contracts Ltd | Other services | 2017 |
| Hidden Abodes Ltd | Real estate | 2024 |
| Hien LE & Co Limited | Professional & scientific | 2013 |
| Hierarch Ltd | Education | 2023 |
| Hiflex Partners Ltd | Administrative & support | 2026 |
| HIG BOY Ltd | Wholesale & retail | 2025 |
| Higgi Ventures Ltd | Administrative & support | 2023 |
| High City IT Limited | Information & communication | 2016 |
| High Hygiene Cleaning Company Limited | Administrative & support | 2025 |
| High IQ Entertainment Ltd | Professional & scientific | 2019 |
| High Street Property Investment Limited | Real estate | 2022 |
| Highbury Mortgage Management Ltd | Financial services | 2016 |
| Highlevel Properties Limited | Extraterritorial | 2024 |
| Highridge Consultants Limited | Real estate | 2011 |
| Highridge Properties Limited | Real estate | 2017 |
| Highshield Limited | Extraterritorial | 1995 |
| Hightech Mobile Computer Services Ltd | Wholesale & retail | 2018 |
| Highview Lodge (the Ridgeway) Management Company Limited | Households | 2000 |
| Highview Lodge Freehold Limited | Households | 2013 |
| Highway Motors Ltd | Wholesale & retail | 2025 |
| Hihat Music Limited | Arts & recreation | 2017 |
| Hilal Meat Ltd | Wholesale & retail | 2021 |
| Hilary Alexander Travel Limited | Administrative & support | 2016 |
| Hillfish Ltd | Hospitality | 2025 |