| Hawik Property Management Ltd | Real estate | 2019 |
| Hawkeye Property (N.E.) Limited | Real estate | 2025 |
| Hawkspur Green Ltd | Real estate | 2021 |
| Hazardous Consulting Ltd | Professional & scientific | 2014 |
| Hazon Burn Group 1 Limited | Real estate | 2021 |
| HB Heating North East Ltd | Extraterritorial | 2010 |
| Health Food Products Limited | Extraterritorial | 2004 |
| Health HUT Professionals Ltd. | Health & social care | 2010 |
| Heart Grid Collective Ltd | Education | 2025 |
| Heartdog Ltd | Information & communication | 2024 |
| Heartdog Media Ltd | Information & communication | 2026 |
| Heartificial Intelligence Ltd | Information & communication | 2020 |
| Hearts to Heaven Pet Crematorium Limited | Other services | 2020 |
| Heaton Glass & Glazing Limited | Construction | 2010 |
| Hedonizm Ltd | Other services | 2015 |
| Helix Regulatory Consulting Ltd | Professional & scientific | 2026 |
| Hemscott Enterprises Ltd | Hospitality | 2015 |
| Hencotes Ltd | Real estate | 2003 |
| Henderson Independent Financial Management Limited | Financial services | 2019 |
| Henshaw Holdings Ltd | Real estate | 2022 |
| Henwell Property Ltd | Real estate | 2016 |
| Henzell Enterprises Limited | Agriculture & fishing | 2011 |
| Hepscott Manor Management Company Limited | Households | 2002 |
| Heron Plumbing & Heating Ltd | Construction | 2021 |
| HH Steel Erection & Cladding Ltd | Construction | 2023 |
| HHC Leisure Ltd | Wholesale & retail | 2026 |
| High Angerton Management Limited | Households | 2009 |
| High Hazon Farm Ltd | Financial services | 2025 |
| High Park Services Ltd | Construction | 2025 |
| Highbury Jewellers Limited | Wholesale & retail | 2001 |
| Highlights Public Relations Ltd | Professional & scientific | 2008 |
| Hill 2 High Street Limited | Wholesale & retail | 2020 |
| Hills & Tides Cottages Limited | Hospitality | 2026 |
| Hilton Media Ltd | Arts & recreation | 2003 |
| Hindhaugh Homes Limited | Construction | 2003 |
| Hiphipporay Ltd | Wholesale & retail | 2021 |
| HK Takeaway Ltd | Hospitality | 2023 |
| Hlmmarketing Ltd | Professional & scientific | 2026 |
| HLP Developments Ltd | Real estate | 2026 |
| Hoggbim Ltd | Professional & scientific | 2020 |
| Holden Solutions Limited | Information & communication | 2008 |
| Home Hunter of the North Ltd | Real estate | 2017 |
| Hope Holidays Ltd | Hospitality | 2021 |
| Horizon Real Estate Ventures Limited | Construction | 2025 |
| Horner Consultancy Ltd | Financial services | 2014 |
| Horse Shuttle UK Ltd | Transport & logistics | 2021 |
| Horsman Beattie Homes Limited | Professional & scientific | 2020 |
| Hort Ltd | Professional & scientific | 2018 |
| Hot TUB TLC Limited | Other services | 2017 |
| Howell Marine Consulting Ltd | Professional & scientific | 2015 |
| Hoytinal Ltd | Professional & scientific | 2016 |
| HS Engineering Ltd | Professional & scientific | 2026 |
| HUD Aesthetics Northumberland Ltd | Health & social care | 2026 |
| Hugo Wolferton Ltd | Professional & scientific | 2012 |
| Humberstone Health Care Ltd | Health & social care | 2015 |
| Hummingbird Drinks Ltd | Hospitality | 2022 |
| Hunters Squirrels Ltd | Agriculture & fishing | 2021 |
| Huntsman Associates Ltd. | Administrative & support | 2001 |
| Hypaholdings Ltd | Financial services | 2026 |
| Hypastrut Ltd | Professional & scientific | 2024 |
| I.F. Retail Ltd | Wholesale & retail | 2019 |
| IAN Douglas Joinery Contractors Limited | Construction | 2021 |
| IAN James HSE Limited | Professional & scientific | 2025 |
| IBO Properties Limited | Real estate | 2022 |
| ICP Design Solutions Ltd | Construction | 2018 |
| Icpp Ltd | Education | 2026 |
| Identityfirst Ltd | Information & communication | 2025 |
| Ideographic Ltd | Professional & scientific | 2005 |
| IDP Developments Ltd | Construction | 2024 |
| Iffat Ltd | Hospitality | 2025 |
| Ihsv Limited | Professional & scientific | 2024 |
| Iley Technology Ltd | Professional & scientific | 2011 |
| ILI Solutions Limited | Professional & scientific | 2018 |
| Illume Estates Ltd | Real estate | 2025 |
| Immobilase Ltd | Professional & scientific | 2025 |
| In-Depth Cleaning Services Ltd | Administrative & support | 2003 |
| IN2DESIGN Ltd | Professional & scientific | 2017 |
| INA Fire Consulting Ltd | Professional & scientific | 2022 |
| India Connections Limited | Administrative & support | 2012 |
| Infomaze Limited | Information & communication | 2025 |
| Infotalis Ltd | Information & communication | 2020 |
| Inglewood Court (Arnside) Management Company Limited | Households | 1997 |
| Initium (NE) Ltd | Financial services | 2024 |
| Innova DST Ltd | Information & communication | 2024 |
| Insight Creative Therapy Ltd | Extraterritorial | 2023 |
| Iolite Ltd | Professional & scientific | 2022 |
| Iona Art Glass Limited | Arts & recreation | 2013 |
| IPP Maguire Limited | Real estate | 2018 |
| IQ Electrical Limited | Construction | 2011 |
| ITY Investments Ltd | Financial services | 2026 |
| IVP Interiors Limited | Construction | 2007 |
| IVY Housing Ltd | Real estate | 2022 |
| J & B Law LLP | | 2026 |
| J & C Scott Ltd. | Construction | 2015 |
| J & D Accountancy Ltd | Professional & scientific | 2014 |
| J & D Shepherd Limited | Administrative & support | 2001 |
| J B S Builders Ltd | Construction | 2016 |
| J K Construction North East Ltd | Construction | 2025 |
| J M & a Robson Limited | Agriculture & fishing | 2019 |
| J T Auto Services Ltd. | Wholesale & retail | 2002 |