| Half Moon Willingham Limited | Real estate | 1999 |
| Hall & Parr Property Ltd | Hospitality | 2024 |
| Hall Consultancy (Agri Business) Ltd | Professional & scientific | 2016 |
| Hall Drive Farming Company Limited | Extraterritorial | 2022 |
| Hall Farm Management Co (Lincs) Ltd | Real estate | 2021 |
| Hall Medical Services Ltd | Health & social care | 2017 |
| Hall Mortgages Limited | Financial services | 2014 |
| Hall Thermal Ltd | Manufacturing | 2026 |
| Halo Aware Ltd | Information & communication | 2026 |
| Hamilton Homes Lincoln Ltd | Construction | 2019 |
| Hampshire Investments (Lincoln) Ltd | Construction | 2017 |
| Hampshire Static Caravans Direct Ltd | Hospitality | 2011 |
| Hamtec Consulting Ltd | Administrative & support | 2009 |
| HAN Chef Limited | Hospitality | 2023 |
| Hanbeck Natural Stone Limited | Manufacturing | 1998 |
| Handle Bar & Grill Limited | Hospitality | 2026 |
| Handmade With Rustic Love Ltd | Manufacturing | 2019 |
| Handsome Cabs Ltd | Extraterritorial | 2017 |
| Hangar 18 Technology Limited | Manufacturing | 2008 |
| Hanworth Country Park Holdings Limited | Hospitality | 2023 |
| Hanworth Country Park LLP | | 2018 |
| Hanworth Property and Developments Limited | Construction | 2021 |
| Happy Car Rental Limited | Administrative & support | 2002 |
| Happy Days Event Solutions Limited | Administrative & support | 2024 |
| Happy Days Farming Company Limited | Agriculture & fishing | 2012 |
| Happy Home Garden Limited | Hospitality | 2024 |
| Happy Hounds Limited | Other services | 2006 |
| Happy House Rental Ltd | Real estate | 2016 |
| Happy PAW Ltd | Professional & scientific | 2012 |
| Happybumpday Ltd | Wholesale & retail | 2024 |
| Harco Road Planing Limited | Construction | 2024 |
| Harco Surfacing Group Limited | Construction | 2024 |
| Harco Surfacing Limited | Construction | 2020 |
| Harcon Design Limited | Construction | 2006 |
| Harding House Gallery Ltd. | Arts & recreation | 1994 |
| Hare & Hounds Fulbeck Ltd | Hospitality | 2025 |
| Hare and Cutie Pamper Parties Ltd | Arts & recreation | 2026 |
| Harkness and Sons Ltd | Construction | 2024 |
| Harland's Barbershop Ltd | Other services | 2023 |
| Harlequin Consultants Ltd | Professional & scientific | 2022 |
| Harlequin Driving Services Ltd | Transport & logistics | 2022 |
| Harlequin Glass Designs Limited | Professional & scientific | 1997 |
| Harlequin Tiling Services Limited | Construction | 2007 |
| Harlequin Windows & Conservatories Ltd | Manufacturing | 2009 |
| Harlequins Hair & Beauty Studio Ltd | Other services | 2026 |
| Harley ENT Practice Limited | Health & social care | 2007 |
| Harmston Waste Management Limited | Mining & quarrying | 2001 |
| Harnland Limited | Real estate | 1992 |
| Harold Pinchbeck Ltd | Wholesale & retail | 2008 |
| Harper Mather Holdings Limited | Real estate | 2025 |
| Harringtons Construction & Interiors Ltd | Construction | 2023 |
| Harris Homes (Lincoln) Ltd | Construction | 2020 |
| Harris Jones Developments Limited | Real estate | 2020 |
| Harris Jones Scaffolding Ltd | Construction | 2021 |
| Harris Wilson Interiors Ltd | Professional & scientific | 2026 |
| Harrison Holdings Ltd | Extraterritorial | 2015 |
| Harrison Security Holdings Ltd | Extraterritorial | 2020 |
| Harrison Security Ltd | Extraterritorial | 2005 |
| Harrison Seymour LLP | | 2011 |
| Harrisons Group Limited | Extraterritorial | 2003 |
| Harrisons Security Ltd | Extraterritorial | 2004 |
| Harriss Limited | Real estate | 2011 |
| Harriss Property (R) Limited | Construction | 2011 |
| Harriss Property (W) Limited | Extraterritorial | 2010 |
| Harrmony Investments Limited | Financial services | 2021 |
| Harrmony Limited | Real estate | 2020 |
| Harrow Gastro Ltd | Health & social care | 2010 |
| Harry Rock & Co Limited | Real estate | 2016 |
| Harry's Jerk Centre Ltd | Hospitality | 2019 |
| Hartsholme General Stores Ltd | Wholesale & retail | 2008 |
| Harvest Electrical Limited | Construction | 2024 |
| Harvest Realty Limited | Real estate | 2025 |
| Harvesteye Limited | Professional & scientific | 2019 |
| Harvey's Motors Ltd | Transport & logistics | 2015 |
| HAS International Limited | Wholesale & retail | 2024 |
| Haustrich Limited | Hospitality | 2023 |
| Haven Country Supplies Limited | Extraterritorial | 2024 |
| Haven Therapeutic Care Limited | Health & social care | 2026 |
| Havenly Homes TR Ltd | Real estate | 2025 |
| Havenstow Properties Ltd | Hospitality | 2023 |
| Hawk Business Services Ltd | Information & communication | 2024 |
| Hawley Property Management Ltd | Hospitality | 2026 |
| Hawthorn Chase Management Company Limited | Households | 1984 |
| Hawthorn Facilities Ltd | Real estate | 2017 |
| Hawthorns CI Limited | Professional & scientific | 2018 |
| Haydenmark Developments Limited | Real estate | 2007 |
| Hayes HV Solutions Ltd | Professional & scientific | 2026 |
| Hayrick Properties Limited | Hospitality | 2024 |
| Hayward DRY Lining Ltd | Construction | 2017 |
| Hazelwood Distribution Limited | Real estate | 1983 |
| Hazelwood Holdings (Lincoln) Limited | Real estate | 2025 |
| HC Health Solutions Ltd | Real estate | 2024 |
| HC3 Ltd | Construction | 2024 |
| HD Brickwork (Lincoln) Ltd | Construction | 2022 |
| HD Fluid Power Ltd | Manufacturing | 2025 |
| HDD Consulting & Supervision Limited | Manufacturing | 2014 |
| HDS CSP Ltd | Transport & logistics | 2025 |
| Heads Together Leadership Ltd | Professional & scientific | 2023 |
| Headset Consultancy Limited | Health & social care | 2023 |
| Headsmart Rehab Ltd | Health & social care | 2014 |