| Grangemoor Care Homes Limited | Health & social care | 1990 |
| GRANTS4U Ltd | Professional & scientific | 2018 |
| Great Little Childcare Company Limited | Education | 2002 |
| Green Bolt Property Ltd. | Real estate | 2020 |
| Green Bowman Limited | Manufacturing | 2013 |
| Green Gables Montessori School Limited | Education | 2003 |
| Green Lean Ltd | Administrative & support | 2024 |
| Green Stripe Capital Limited | Financial services | 2026 |
| Green Team Solutions Limited | Construction | 2020 |
| Greencable Ltd | Water & waste | 2019 |
| Greenheart Learning Partnership | Education | 2012 |
| GREENIE24 Ltd | Professional & scientific | 2010 |
| Grenson Motor Company Limited | Wholesale & retail | 1977 |
| Grid HEX Trading Limited | Wholesale & retail | 2025 |
| Griffith Business Support Ltd | Administrative & support | 2017 |
| Grove Terrace Walsall Management Company Limited | Real estate | 2011 |
| GRP Signs Limited | Professional & scientific | 1993 |
| Gym Threads Ltd | Wholesale & retail | 2019 |
| H D Consultancy Limited | Education | 2021 |
| H&D Projects Ltd | Manufacturing | 2025 |
| H-Made Holdings Ltd | Real estate | 2021 |
| H.P. Westwood Limited | Wholesale & retail | 2003 |
| H2ORIZONS Limited | Manufacturing | 2016 |
| Habelo Limited | Financial services | 2025 |
| Hall Engineering Ltd | Construction | 2018 |
| Hamer Freeholds Limited | Households | 2022 |
| Hands on Health Clinic Limited | Health & social care | 2013 |
| Happy Child (Mottingham) Limited | Education | 2008 |
| Happy Child Limited | Education | 1997 |
| Harlequin Childcare Limited | Education | 2003 |
| Harley Decor Limited | Construction | 2011 |
| Hartwell Consultants Ltd | Information & communication | 2014 |
| Haselbech Limited | Administrative & support | 2019 |
| Hawkeswood and Heritage Wellness Limited | Other services | 2026 |
| Haywoods Blinds Ltd | Other services | 2019 |
| Haywoods Contracts Limited | Manufacturing | 2001 |
| Haywoods Creative Solutions Ltd | Information & communication | 2024 |
| HAZ Holdings Limited | Extraterritorial | 1999 |
| HAZ Industrial Services Limited | Extraterritorial | 1993 |
| Hazelmere Drive Management Company Limited | Households | 2003 |
| HCL Acquisitions Limited | Education | 2007 |
| HCL Finance Limited | Education | 2007 |
| Hdhn Financial Planning Solutions Ltd. | Financial services | 2015 |
| Heath Anthony 0145 Limited | Transport & logistics | 2014 |
| Heavenly Baking Ltd | Hospitality | 2021 |
| Hedgehog Services Ltd | Administrative & support | 2005 |
| Hemm Hire Holdings Ltd | Construction | 2023 |
| Hemm Hire Ltd | Construction | 2025 |
| Henson Controls Limited | Information & communication | 1996 |
| Hexeum Ltd | Wholesale & retail | 2022 |
| HEY Diddle Diddle Group Ltd | Education | 2015 |
| HGD Contracting Limited | Agriculture & fishing | 2024 |
| Highfields Plumbing & GAS Services Ltd | Construction | 2011 |
| HIS and Hers Wedding Cars Limited | Administrative & support | 2014 |
| HKP Property Rentals Limited | Real estate | 2024 |
| HM Steeltech Limited | Manufacturing | 1995 |
| Hmoe Limited | Real estate | 2025 |
| Hoggs Holmes Limited | Real estate | 2021 |
| Home Repair Solutions Ltd | Construction | 2023 |
| Homes Choice Rentals Limited | Real estate | 2018 |
| Horizon Management Company (Hammerwich) Limited | Households | 2022 |
| Hounds of Love Ltd | Wholesale & retail | 2019 |
| House of Gelato Limited | Manufacturing | 2026 |
| HSM (UK) Limited | Manufacturing | 2003 |
| Hughes Grab Hire Ltd | Construction | 2021 |
| HW Controls & Assurance Limited | Professional & scientific | 2013 |
| Hydrogleam Automotive Ltd | Wholesale & retail | 2021 |
| Hysw Limited | Real estate | 2025 |
| I CAN Day Nurseries Limited | Health & social care | 2011 |
| I&B Artisanfood and Drink Ltd | Hospitality | 2022 |
| I-Ddo Investment Ltd | Real estate | 2019 |
| I-On Security Ltd | Administrative & support | 2020 |
| Iacovitti Properties Limited | Extraterritorial | 2013 |
| IAN Clegg Engineering Ltd | Manufacturing | 2024 |
| IAN Shephard Ltd | Real estate | 2025 |
| IB Contract Services Limited | Construction | 2015 |
| Ikon Hair & Beauty Ltd | Other services | 2011 |
| Illusiom Ltd | Professional & scientific | 2025 |
| Imperial Cooker Limited | Hospitality | 2023 |
| Imperial Property Solutions Limited | Construction | 2025 |
| In-Tech Solutions Limited | Information & communication | 2015 |
| Indigo GAS Services Limited | Construction | 2004 |
| Indus Aluminium Ltd | Manufacturing | 2019 |
| Inflate-Ting Bouncy Castles Ltd | Administrative & support | 2025 |
| Inglewood Home Care Limited | Health & social care | 2024 |
| Inglewood Residential Rest Home Limited | Health & social care | 2013 |
| Inkas Addressing Systems Limited | Wholesale & retail | 2005 |
| Insulfix Ltd | Construction | 2016 |
| Integral Fire Solutions Limited | Public administration | 2025 |
| Integrity Property Management & Lettings Ltd | Real estate | 2015 |
| Integrity Surveying Ltd | Professional & scientific | 2014 |
| Intercrest Limited | Real estate | 2016 |
| Interpersonal Insights Ltd | Professional & scientific | 2018 |
| Inut Systems Ltd | Professional & scientific | 2020 |
| Ironsun (UK) Limited | Manufacturing | 1997 |
| Island MOT Ltd | Wholesale & retail | 2002 |
| IT Recover Ltd | Other services | 2015 |
| It's Fresh Limited | Manufacturing | 2008 |
| Itfix Ltd | Wholesale & retail | 2025 |
| Itotek Ltd | Manufacturing | 2021 |