| Gorub Ltd | Health & social care | 2023 |
| Goyolo Ltd | Information & communication | 2015 |
| Gra-Activities Ltd | Health & social care | 2018 |
| Grace Inyasha Limited | Health & social care | 2022 |
| Graced VEE Ltd | Professional & scientific | 2025 |
| Grade 1 Metalworks (Gary Parkinson) Limited | Financial services | 2006 |
| Gradient UX Limited | Professional & scientific | 2022 |
| Gran Leon UK Investment Limited | Transport & logistics | 2023 |
| Grand Gadgets Ltd | Real estate | 2012 |
| Grandport Solutions Limited | Real estate | 2018 |
| Grange Motors (Brentwood) Limited | Wholesale & retail | 1958 |
| Grange Motors (Swindon) Limited | Wholesale & retail | 2002 |
| Grape City Ltd | Construction | 2025 |
| Graphicslink Limited | Information & communication | 2001 |
| Grasspost Limited | Professional & scientific | 1981 |
| Gray Place Investments Limited | Real estate | 2024 |
| Grcl Property Ltd | Real estate | 2021 |
| Greater London Drainage Ltd | Water & waste | 2010 |
| Green Bear Marketing Limited | Professional & scientific | 1977 |
| Green Future Design Limited | Professional & scientific | 2011 |
| Green Grocery Paradise Limited | Hospitality | 2014 |
| Green Lane Homes (Hatfield) 2020 Ltd | Households | 2020 |
| Green Light Global Limited | Public administration | 2025 |
| Green Tree (Warehousing) Limited | Transport & logistics | 1985 |
| Greenblooms Estate Management Limited | Households | 2025 |
| Greenview Court Freehold Limited | Households | 1995 |
| Greg Caras Travel Ltd | Administrative & support | 2016 |
| Grey Genesis Limited | Real estate | 2023 |
| Greyhead Design Limited | Information & communication | 2012 |
| Greystone Masonry Limited | Manufacturing | 2009 |
| Griffin Automotive Limited | Administrative & support | 2018 |
| Groc Technologies Ltd | Wholesale & retail | 2020 |
| Groomers on the Green Ltd | Administrative & support | 2025 |
| Groominnovation Limited | Other services | 2012 |
| Growing Success Limited | Other services | 1985 |
| Grozav Trans Ltd | Transport & logistics | 2022 |
| GSA Quality Assure Ltd | Professional & scientific | 2023 |
| GTL Management Ltd | Construction | 2023 |
| GU FIX Ltd | Construction | 2013 |
| Guan YE Machinery Engineering Technology Limited | Professional & scientific | 2018 |
| Gugenheim Turner Consulting and Investments Limited | Professional & scientific | 2025 |
| Guhash Limited | Professional & scientific | 2015 |
| Gulercan Holding Ltd | Financial services | 2024 |
| Gutter Cleaners Ltd | Administrative & support | 2025 |
| Guven Blake Logistics Ltd | Transport & logistics | 2025 |
| GXA CON Ltd | Professional & scientific | 2022 |
| GXA Ltd | Professional & scientific | 2026 |
| GXA Pro Ltd | Real estate | 2024 |
| Gyuszushun Ltd | Transport & logistics | 2018 |
| H&G Property Holdings Ltd | Real estate | 2021 |
| H&S Tree Ltd | Wholesale & retail | 2026 |
| H.2.2 Merchants Ltd | Wholesale & retail | 2024 |
| H.Otomi Engineering Ltd | Construction | 2020 |
| Haandi Restaurants Limited | Hospitality | 1998 |
| HAB Commercial Estates Ltd | Real estate | 2025 |
| Habilitas Limited | Professional & scientific | 2023 |
| Habman Ltd | Real estate | 2024 |
| Hadley Property Consultancy Limited | Real estate | 2013 |
| Hair by Carley Limited | Other services | 2018 |
| Hair Heaven Limited | Wholesale & retail | 2010 |
| Hair Imagez Limited | Other services | 2012 |
| Hairbinet Ltd | Other services | 2025 |
| Hairways 77 Limited | Wholesale & retail | 2003 |
| Halewood Leasing Limited | Financial services | 1997 |
| Hallmarked Design Ltd | Professional & scientific | 2020 |
| Halritt Ltd | Manufacturing | 2018 |
| Hamish Works Ltd | Professional & scientific | 2025 |
| Hampton Waskett Ltd. | Professional & scientific | 2013 |
| Hand Car Wash W.J.S. Ltd | Other services | 2017 |
| Handmade by Camelia Ltd | Manufacturing | 2020 |
| Hands for Independence Ltd. | Health & social care | 2022 |
| Hands-On Complementary Therapies Limited | Health & social care | 2002 |
| Hang YEE Limited | Wholesale & retail | 2016 |
| Hanger 44 Limited | Professional & scientific | 2026 |
| Hans Healthcare Limited | Health & social care | 2017 |
| Hansford Brown Limited | Professional & scientific | 2003 |
| Hapco Ltd. | Real estate | 1999 |
| Happy Hours OUT of School Club Limited | Health & social care | 2017 |
| Harbour Club Limited | Arts & recreation | 1993 |
| Harbour Club Operations Limited | Professional & scientific | 1999 |
| Hard & Jurca Limited | Construction | 2018 |
| Harding & Hall Limited | Hospitality | 2021 |
| Hare Consultants Limited | Professional & scientific | 2013 |
| Harikrushna Export Import Ltd | Water & waste | 2026 |
| Harithand Ltd | Manufacturing | 2025 |
| Harley Street Personal Consulting Limited | Health & social care | 2018 |
| Harmony Event Decorations Limited | Other services | 2020 |
| Harmony Menswear Limited | Wholesale & retail | 2026 |
| Haroon Trader Limited | Wholesale & retail | 2026 |
| Harpenden Consulting and Management Limited | Professional & scientific | 2022 |
| Harris & Jenkins Associates Ltd | Professional & scientific | 2023 |
| Harrison & Hussey Limited | Professional & scientific | 1984 |
| Harrps Building & Constructions Ltd | Construction | 2018 |
| Harrps Property Maintenance Services Ltd | Other services | 2016 |
| Harsha Enterprise Private Ltd | Wholesale & retail | 2024 |
| Haru Beauty Limited | Other services | 2025 |
| Harvish UK Limited | Wholesale & retail | 2024 |
| Hashtag Digital Media Limited | Information & communication | 2021 |
| Hatches Limited | Wholesale & retail | 2020 |
| Hatfield Barbers Limited | Other services | 2019 |