| Heidais Limited | Financial services | 2026 |
| Helen Dent Ltd | Professional & scientific | 2025 |
| Henry’S Sensory Rooms Ltd | Health & social care | 2026 |
| Herringthorpe Property Company Limited | Real estate | 1965 |
| Hertford Partners (South East) Limited | Professional & scientific | 2013 |
| Hidden Movie Limited | Information & communication | 2023 |
| Highgate Holiday Lodges Limited | Wholesale & retail | 2012 |
| Highway Shearing Limited | Agriculture & fishing | 2009 |
| Hiking Highs & Helvellyn Hideaways Limited | Arts & recreation | 2023 |
| Hill & Roberts Properties Limited | Real estate | 2021 |
| Hillcroft Leisure Limited | Hospitality | 2012 |
| Hipss Ltd | Information & communication | 2020 |
| Histopoly Limited | Wholesale & retail | 2024 |
| Hjep Limited | Hospitality | 2019 |
| Hjkl Spedition Ltd | Water & waste | 2013 |
| HK Holdings 2025 Limited | Wholesale & retail | 2002 |
| Hlww Limited | Professional & scientific | 2021 |
| HM Consulting Services Ltd | Professional & scientific | 2025 |
| Hodgson Brickwork Limited | Construction | 2023 |
| Hoff Lunn Sporting Limited | Arts & recreation | 2022 |
| Holders (Cumbria) Limited | Transport & logistics | 2003 |
| Holesfoot Ltd | Hospitality | 2024 |
| Holistics (UK) Limited | Real estate | 2000 |
| Holland & Oxley Plant Hire Ltd | Administrative & support | 2014 |
| Holland and Oxley Paving and Groundworks Limited | Construction | 2020 |
| Hollins View Farm | Agriculture & fishing | 2007 |
| Holmland Farms | Administrative & support | 2009 |
| Home Courtyard Limited | Households | 2013 |
| Home Farm (Road Management) Limited | Households | 2014 |
| Home Farm Barns (Patterdale) Management Limited | Households | 2017 |
| Home Glazing Ltd | Construction | 2025 |
| Hope's Engineering Ltd | Professional & scientific | 2020 |
| Hopegill Associates Ltd | Professional & scientific | 2021 |
| Hoperiver Limited | Hospitality | 2003 |
| Horavelle & Co Ltd | Manufacturing | 2025 |
| Horizon Dairy Vets Limited | Professional & scientific | 2017 |
| Horn Hill Care Services Limited | Health & social care | 2007 |
| Horse and Farrier Courtyard Management Limited | Households | 2009 |
| Horseshoe Yard (Stainton) Limited | Real estate | 2024 |
| Hotstuff Chilli Company Ltd | Manufacturing | 2019 |
| House of Fili Limited | Real estate | 2016 |
| Housedock Ltd | Wholesale & retail | 2025 |
| HOW Hill (Penrith) Management Company Limited | Households | 2018 |
| Howard Denton International Limited | Professional & scientific | 1984 |
| Howes Farming Company | Agriculture & fishing | 2018 |
| Howfoot Leisure Ltd | Wholesale & retail | 2019 |
| Howgill Holdings Limited | Financial services | 2003 |
| HRC Beckermet Limited | Extraterritorial | 2021 |
| HRC Contracting Limited | Construction | 2022 |
| Hudnalls Property Investment Co.Limited | Real estate | 1965 |
| Hullock Howe Farming Limited | Agriculture & fishing | 2014 |
| Humes Catering Services Ltd | Hospitality | 2011 |
| Hunsonby Swimming Club | Arts & recreation | 2015 |
| Hunter Hall Developments Limited | Construction | 2017 |
| Hunter Hall School | Education | 1996 |
| Hunters Services (Cumbria) Ltd | Administrative & support | 2025 |
| Hutton Car Sales Limited | Wholesale & retail | 2005 |
| Hutton Hall Management Limited | Households | 2015 |
| Hutton Head Farm LLP | | 2019 |
| HVH GAS Ltd | Construction | 2023 |
| HW Infrastructure Ltd | Construction | 2021 |
| HW Land Holdings Ltd | Financial services | 2025 |
| HW Land Management Ltd | Real estate | 2022 |
| Hyslop & Atkinson Limited | Hospitality | 2009 |
| I & P Ellithorn Limited | Agriculture & fishing | 2012 |
| I J Curry & SON Limited | Construction | 2015 |
| I&T Car and Commercial Ltd | Wholesale & retail | 2025 |
| I-Stage Limited | Arts & recreation | 2013 |
| IAA Trading Ltd | Wholesale & retail | 2024 |
| IAN Cleasby Agricultural Limited | Manufacturing | 2006 |
| IAN Cleasby Drafting and Design Limited | Professional & scientific | 2012 |
| IAN Ritchie Land Agents Limited | Professional & scientific | 2019 |
| IAN Wilson Garage Repairs Limited | Wholesale & retail | 2021 |
| Icon Publications Limited | Information & communication | 1987 |
| ID Alpha Ltd | Information & communication | 2020 |
| Idoko Medical Services Limited | Health & social care | 2022 |
| Ijomah Management Company Limited | Real estate | 1990 |
| Ilkley Bahtat Limited | Wholesale & retail | 2021 |
| Immersive Entertainments Limited | Administrative & support | 2008 |
| IN the Company of Dogs Ltd | Transport & logistics | 2025 |
| Indian Plaza Cumbria Ltd | Hospitality | 2025 |
| Industrial Business Services Limited | Information & communication | 2011 |
| Industrial Cleaning Machines Limited | Extraterritorial | 2012 |
| Inglewood Farms Limited | Agriculture & fishing | 1973 |
| Inglewood Flusco Limited | Real estate | 2025 |
| Inglewood Properties Limited | Financial services | 2020 |
| Inglewood Terrace Management Company Limited | Households | 2021 |
| Inn Eden Limited | Hospitality | 2015 |
| Innhospitality Ltd | Administrative & support | 2022 |
| Inside OUT Camping Limited | Hospitality | 2009 |
| Inspira (01) | Education | 2001 |
| Inspire Health & Beauty Ltd | Health & social care | 2015 |
| Inspired Data Limited | Information & communication | 2018 |
| Integrate Cumbria CIC | Health & social care | 2024 |
| Integrated Intelligent Supply Chains Limited | Professional & scientific | 2012 |
| Integrated Synergy Consulting Ltd | Professional & scientific | 2026 |
| Intercars of Carlisle Ltd | Wholesale & retail | 2014 |
| Intercars of Penrith Limited | Wholesale & retail | 2005 |
| Into the Outside Limited | Arts & recreation | 2017 |
| Into the Wilds Cumbria Limited | Hospitality | 2023 |