| House of Heath Ltd | Information & communication | 2015 |
| House of Heath Television Limited | Information & communication | 2017 |
| House of Kelly Limited | Wholesale & retail | 2013 |
| House of Lamont Ltd | Other services | 2023 |
| House of MO Limited | Real estate | 2025 |
| Howard & Sons Landscapes Ltd | Administrative & support | 2026 |
| Howie Investments Ltd | Real estate | 2022 |
| HP Parts Direct Ltd | Wholesale & retail | 2024 |
| Hq-One Limited | Construction | 2013 |
| HR Analytics Ltd | Professional & scientific | 2015 |
| HRC Brickwork Limited | Construction | 2021 |
| HRC Sourcing Ltd | Manufacturing | 2014 |
| HS Vibe Services Ltd | Administrative & support | 2018 |
| Hsware Ltd | Professional & scientific | 2025 |
| HTE Holdings Limited | Financial services | 2018 |
| HTE Properties Limited | Financial services | 2018 |
| Hub 87 Ltd | Manufacturing | 2017 |
| Hubsync Ltd | Information & communication | 2026 |
| Huckle's Heating Limited | Construction | 2013 |
| Huddwell Fibre Systems Ltd | Information & communication | 2020 |
| Hudson Drylining Ltd | Construction | 2017 |
| Hudson's Buzz Trim & Skin Ltd | Real estate | 2025 |
| Hughes Masonry Ltd | Construction | 2023 |
| Hughes Roofing Cladding and Consultancy Ltd | Construction | 2026 |
| Hugs Holdings Limited | Real estate | 2021 |
| Hulme Martin Heat Sealers Limited | Manufacturing | 2005 |
| Huna Labs Ltd | Manufacturing | 2020 |
| Hungry HOG Southern Ltd | Hospitality | 2026 |
| Hunston House (Freehold) Limited | Households | 2011 |
| Hunter & Cole Associates Ltd | Administrative & support | 2019 |
| Hunter Simmons Ltd | Administrative & support | 2011 |
| Hunters Croft Limited | Other services | 2021 |
| Huntington Hawkins Medical Services Limited | Health & social care | 2020 |
| Huntley Properties Holdings Limited | Real estate | 2018 |
| Husky Hospitality Ltd | Hospitality | 2017 |
| Hvac Intelligence Ltd | Construction | 2025 |
| HVB Limited | Wholesale & retail | 2021 |
| Hydravolt Ltd | Manufacturing | 2026 |
| Hydro Muscles Limited | Information & communication | 2022 |
| Hydroplus Limited | Manufacturing | 2018 |
| Hyfi Have YOU Fried IT? Franchising Group Limited | Administrative & support | 2025 |
| Hyfi? Express Limited | Hospitality | 2025 |
| Hyghtona Limited | Real estate | 1997 |
| Hyperlight Technologies Limited | Professional & scientific | 2024 |
| Hypersonic IT Limited | Information & communication | 2014 |
| Hypertrophic Entertainment Ltd | Information & communication | 2024 |
| Hyrolec Limited | Professional & scientific | 2025 |
| I AM a Songwriter Ltd | Education | 2025 |
| I B Holdings & Investments Limited | Real estate | 2015 |
| I Day Consulting Ltd | Professional & scientific | 2014 |
| I Love U Limited | Information & communication | 2004 |
| I&M Care Limited | Health & social care | 2018 |
| I-Compli Assessments UK Limited | Professional & scientific | 2025 |
| I-Pharm Ltd | Health & social care | 2013 |
| I-Serv Fabrication Limited | Financial services | 2020 |
| I-Serv Mechanical Limited | Construction | 2012 |
| I. Smith Limited | Professional & scientific | 2006 |
| I.C.E.E (Engineering Services) Limited | Professional & scientific | 2003 |
| I.S.T. Medical Services Limited | Health & social care | 2013 |
| Iagree Solar UK Limited | Energy | 2024 |
| Iama Discovery Solutions Ltd | Professional & scientific | 2021 |
| IAN Smith Builders Holdings Limited | Financial services | 2024 |
| Ibilly Media Group Ltd | Information & communication | 2019 |
| Ibnesaif Limited | Wholesale & retail | 2021 |
| Ibuild Home Renovations Ltd | Construction | 2019 |
| IC Active Training Limited | Education | 2014 |
| IC Cuisine Limited | Hospitality | 2016 |
| Icee Limited | Extraterritorial | 2014 |
| Idigital Advert Ltd | Administrative & support | 2021 |
| Idlewood Properties Limited | Real estate | 1997 |
| Idm&A Limited | Information & communication | 2016 |
| Iemedia International Limited | Education | 2025 |
| IES Machining Ltd | Professional & scientific | 2022 |
| Igoe Properties Ltd | Real estate | 2024 |
| IGS Electrics Ltd | Construction | 2014 |
| IGT Financial Limited | Professional & scientific | 2008 |
| IHJ Group Ltd | Financial services | 2024 |
| IHJ Property Investments Ltd | Real estate | 2024 |
| IHR Professionals Limited | Administrative & support | 2020 |
| IIS Services Ltd | Transport & logistics | 2025 |
| IK Forklift Training Limited | Transport & logistics | 2019 |
| Ikeda Hoover Limited | Professional & scientific | 1985 |
| Ikiwi UK Limited | Wholesale & retail | 2011 |
| Iland Developments Ltd | Construction | 2019 |
| Illuminating Glory Ltd | Other services | 2016 |
| Illumination Electrical Limited | Construction | 2012 |
| Illuminatis Gourmet Garage Ltd | Professional & scientific | 2020 |
| IM Property Capital Ltd | Real estate | 2018 |
| Imagesinaction Limited | Professional & scientific | 2020 |
| Imem 1 Property Ltd | Real estate | 2024 |
| Imem 2 Property Ltd | Real estate | 2024 |
| Imem Property Ltd | Financial services | 2024 |
| IMI Insulation Limited | Construction | 2003 |
| Imogen Ware Associates Ltd | Administrative & support | 2017 |
| Imotin Investments Ltd | Financial services | 2025 |
| Impact Air Conditioning Services Ltd | Construction | 2021 |
| Improvyourbiz Limited | Professional & scientific | 2010 |
| Impulse Renovations Limited | Construction | 2020 |
| IMS Capital Limited | Financial services | 2010 |
| IN 2 Tiles Limited | Wholesale & retail | 2009 |