| Howden Construction Limited | Construction | 2016 |
| Howtin 2016 Limited | Professional & scientific | 2016 |
| Howw Limited | Administrative & support | 2026 |
| HOY Ltd | Construction | 2015 |
| Hoyles Estates Limited | Real estate | 2022 |
| HPI Energy Services Ltd | Manufacturing | 2004 |
| HQ Corporation Limited | Wholesale & retail | 2019 |
| Hrhaam Ltd | Health & social care | 2024 |
| HRL Civils & Utilities Ltd | Administrative & support | 2017 |
| HRM Estates Limited | Real estate | 2016 |
| HRR Medical Services Ltd | Health & social care | 2026 |
| HS Leather Hub Ltd | Manufacturing | 2026 |
| HS Seed Testing Limited | Agriculture & fishing | 2023 |
| Hsbk Logistics Limited | Transport & logistics | 2021 |
| HSC Contracting Ltd | Construction | 2014 |
| Hssleaford Ltd | Wholesale & retail | 2022 |
| HT Goalkeeping Coaching Ltd | Education | 2025 |
| HT Goalkeeping Ltd | Wholesale & retail | 2023 |
| HT Marine and Power Limited | Wholesale & retail | 1992 |
| HTE Pubs Ltd | Hospitality | 2019 |
| HTS Rentals Limited | Real estate | 2019 |
| HTS Vehicle Sales Holdings Limited | Financial services | 2021 |
| HTS Vehicle Sales Limited | Wholesale & retail | 2011 |
| HTT Holdings Limited | Real estate | 2015 |
| Hubble Medical Ltd | Health & social care | 2015 |
| Hubbr Ltd | Professional & scientific | 2024 |
| Hubgem Marketing Ltd | Administrative & support | 2021 |
| Hubren Building Services Ltd | Construction | 2008 |
| Hueso Holdings Ltd | Financial services | 2017 |
| Hughes Craven Limited | Administrative & support | 2008 |
| Hull Communications Ltd | Information & communication | 2025 |
| Human Alchemy Limited | Professional & scientific | 2000 |
| Humber Bicycles Limited | Wholesale & retail | 2019 |
| Humidity Devices Ltd | Administrative & support | 2013 |
| Humma Shahid Ltd | Health & social care | 2015 |
| Hungate Apartments Ltd | Construction | 2026 |
| Hunger Gate Plus Ltd | Hospitality | 2025 |
| Hungry IMP Ltd | Hospitality | 2025 |
| Hunt & Sykes Safety Services Limited | Professional & scientific | 2011 |
| Hunter Advisory Ltd | Agriculture & fishing | 2007 |
| Hunter Collins Ltd | Construction | 2019 |
| Hursley Lodge Management Company Limited | Households | 1988 |
| Hurst Holdings Limited | Real estate | 1988 |
| Hurstons (Lincoln) Ltd | Professional & scientific | 2017 |
| Hurstons Limited | Professional & scientific | 2013 |
| Hutch Inn and Sons Ltd | Real estate | 2024 |
| Hutchinson Property Investment Limited | Financial services | 2026 |
| Huts 4 YOU Ltd | Hospitality | 2025 |
| Hutton Creative Solutions Limited | Education | 2014 |
| Hutton Software Consulting Ltd | Information & communication | 2023 |
| Hvac Spares Limited | Wholesale & retail | 2015 |
| Hvaradaraj Limited | Health & social care | 2008 |
| HW Homes Limited | Real estate | 2018 |
| HWD Architecture Limited | Professional & scientific | 2025 |
| HWD Site Services LLP | | 2014 |
| HWE Property Ltd | Real estate | 2023 |
| HWN Aesthetics Training Ltd | Health & social care | 2023 |
| Hybrid Building Ltd | Construction | 2023 |
| Hybrid Planning & Development Ltd | Professional & scientific | 2017 |
| Hydrasystems Ltd | Manufacturing | 2012 |
| Hydraulic Seals Ltd | Wholesale & retail | 2003 |
| Hydrodynamic Systems Ltd | Professional & scientific | 2012 |
| Hydrogrit Ltd | Construction | 2011 |
| Hydyne Ltd | Manufacturing | 2017 |
| Hygge Accommodation Ltd | Real estate | 2021 |
| Hykeham Chiropractic Limited | Health & social care | 2010 |
| Hykeham Fuel Supplies Limited | Wholesale & retail | 2013 |
| Hykeham Holdings Ltd | Financial services | 2021 |
| Hykeham MOT Centre Limited | Wholesale & retail | 2010 |
| Hykeham Sailability Limited | Arts & recreation | 2009 |
| Hykeham Traders Ltd | Wholesale & retail | 2025 |
| Hykeham Wholesale Limited | Wholesale & retail | 2002 |
| Hylo Ltd | Construction | 2017 |
| Hyperquad Limited | Information & communication | 2016 |
| Hypewins Limited | Wholesale & retail | 2020 |
| Hytras Ltd | Professional & scientific | 2025 |
| Hyvia Limited | Information & communication | 2025 |
| I & a Estate Ltd | Real estate | 2025 |
| I & K Mawer Investments Ltd | Real estate | 2019 |
| I AM BAD Limited | Manufacturing | 2012 |
| I AM Kebab Ltd | Hospitality | 2022 |
| I Chapman Joinery Services Limited | Construction | 2007 |
| I Christopher Limited | Construction | 2013 |
| I Confirm Limited | Information & communication | 2005 |
| I DO Security Services Limited | Administrative & support | 2025 |
| I J Beckingham Limited | Health & social care | 2009 |
| I O B Group Ltd | Construction | 2023 |
| I Prep Solutions Limited | Construction | 2022 |
| I R Mark Limited | Real estate | 2012 |
| I Taylor Auto Services Limited | Transport & logistics | 2018 |
| I Will Buy Your Car Ltd | Wholesale & retail | 2020 |
| I&S Robinson Ltd | Construction | 2026 |
| I-Square Logistics Ltd | Transport & logistics | 2025 |
| I.C Carpentry & Joinery Ltd | Construction | 2024 |
| IAN Batchelor & SON Landscapes Limited | Administrative & support | 2022 |
| IAN Chamberlain Motorsports Limited | Wholesale & retail | 2006 |
| IAN P Laird Unlimited | Agriculture & fishing | 2004 |
| IAN Prestwood Limited | Wholesale & retail | 2012 |
| IAN Shammon Limited | Wholesale & retail | 2003 |
| IAN Stanley Alderson Limited | Extraterritorial | 2024 |