| General Subsidiary 2 Limited | Administrative & support | 2019 |
| Genetic Records Limited | Professional & scientific | 2008 |
| Genie Instituition Ltd | Education | 2019 |
| Gentlemen's Tonic Limited | Other services | 2003 |
| George Thomas Ltd | Other services | 2024 |
| GET Involved Ltd | Information & communication | 2003 |
| GET Synced Ltd | Professional & scientific | 2016 |
| GFK London Limited | Construction | 2018 |
| Giulio Construction Ltd | Information & communication | 2025 |
| GJ Lewis Roofing Ltd | Construction | 2023 |
| Glam and TAN Limited | Other services | 2014 |
| Glen Chess Guernsey Limited | Construction | 2003 |
| Glencoe Construction Limited | Construction | 1999 |
| Glencoe Road Management Company Limited | Households | 1994 |
| Global Leaf Co Ltd | Wholesale & retail | 2022 |
| Globrands Ltd | Wholesale & retail | 2023 |
| Glost Glaze Limited | Wholesale & retail | 2025 |
| Glowgetter Wellness Limited | Other services | 2020 |
| GM United Limited | Real estate | 2022 |
| GMS360 Ltd | Construction | 2018 |
| GNA Associates Ltd | Information & communication | 2020 |
| Go Pioneers Limited | Wholesale & retail | 2025 |
| Go Platform Ltd | Transport & logistics | 2025 |
| Go.Roqit Ltd | Professional & scientific | 2025 |
| Goldberg Steele Financial Services Limited | Financial services | 2011 |
| Golden Property Investment Ltd | Real estate | 2008 |
| Goldenberg Prop Limited | Real estate | 2019 |
| Goldenseal Diagnostics Limited | Health & social care | 2025 |
| Goldnet Supplies Limited | Hospitality | 2021 |
| Good FIG C.I.C. | Manufacturing | 2025 |
| Goodfellas Roofing & Building Ltd | Construction | 2023 |
| Goodison Close (Bushey) Management Company Limited | Households | 2001 |
| Gooms Cars Limited | Transport & logistics | 2025 |
| Gosport Property Limited | Real estate | 2019 |
| GP Today Limited | Health & social care | 2023 |
| Grace Joyz Fashion Ltd | Wholesale & retail | 2025 |
| Grafton Way Freehold Limited | Financial services | 2015 |
| Gram Holdings Ltd | Real estate | 2025 |
| Grand AV Limited | Manufacturing | 2023 |
| Grandfield Properties Limited | Real estate | 2008 |
| Granwill Limited | Health & social care | 2024 |
| Gravity Co-Living Limited | Hospitality | 2017 |
| Gravity Co-Living Services Ltd | Financial services | 2019 |
| Gravity Dennington Limited | Real estate | 2024 |
| Gravity Finsbury Limited | Real estate | 2024 |
| Gravity Lock Ltd | Real estate | 2020 |
| Gravity Reading Ltd | Real estate | 2022 |
| Gravity West Court Limited | Real estate | 2021 |
| Gravity Westbourne Limited | Real estate | 2024 |
| Gravity Weymouth Limited | Real estate | 2020 |
| Graysontrades Limited | Administrative & support | 2026 |
| Green Connections C.I.C. | Health & social care | 2020 |
| Greene Vehicle Solutions Limited | Administrative & support | 2017 |
| Greensquaremarket Ltd | Wholesale & retail | 2025 |
| Grenadier Developments Limited | Real estate | 2000 |
| Grenley Investments Limited | Real estate | 1962 |
| Grille Room Trading Limited | Professional & scientific | 2008 |
| Grosvenor Bushey LLP | | 2008 |
| Grove Holding PVT Ltd | Real estate | 2020 |
| Grove House Management Company (Bushey) Ltd. | Households | 1998 |
| Grow More Properties Mortgages Ltd | Financial services | 2025 |
| Growstack Investment Limited | Other services | 2023 |
| Gsmr Management Ltd | Real estate | 2023 |
| Guiding Light Logistics Ltd | Other services | 2015 |
| Guild Creatives Ltd | Information & communication | 2020 |
| GW Development (UK) Ltd | Professional & scientific | 2000 |
| H & a Jewellery Services Ltd | Other services | 2024 |
| H Q Plumbing Ltd | Construction | 2018 |
| H&R London Contractors Ltd | Construction | 2015 |
| H26 Bushey Limited | Real estate | 2024 |
| Hadleighs (London) Ltd | Administrative & support | 2019 |
| Hair by Paul & Daniella K Ltd | Other services | 2022 |
| Hair Industries Ltd | Other services | 2024 |
| Hair Roxx Limited | Other services | 2011 |
| Haizel Care Support Ltd | Health & social care | 2019 |
| Halaliday Limited | Information & communication | 2025 |
| Halstead (Brentwood) Limited | Health & social care | 2011 |
| Hammer Property Limited | Real estate | 1997 |
| Handid Ltd | Information & communication | 2024 |
| Hansam Investments Ltd | Real estate | 2019 |
| Happy Froggs Limited | Wholesale & retail | 2019 |
| Happy Heat Limited | Construction | 2021 |
| Hardwick Chancery UK Limited | Professional & scientific | 2018 |
| Hardwick Court Flats Limited | Administrative & support | 1998 |
| Hargun Limited | Real estate | 2002 |
| Harlequins Management Limited | Households | 2022 |
| Harmins (Costumiers) Limited | Real estate | 1937 |
| Harper Retail Consulting Limited | Professional & scientific | 2013 |
| Harriet Simmons Consultancy Limited | Administrative & support | 2014 |
| Harrington Fabrications Limited | Construction | 1987 |
| Harris & Harris (Retail) Limited | Wholesale & retail | 1998 |
| Harrison House Investments Ltd | Real estate | 2001 |
| Hart IT Services Limited | Information & communication | 2025 |
| Hartsbourne Court Management Company Limited | Households | 2016 |
| Harvest Gate (Watford) Residents Management Company Limited | Households | 2007 |
| Hastings & MCC Ltd | Professional & scientific | 2016 |
| Hawkeye Group Ltd | Construction | 2015 |
| Hawthorn RTM Company Limited | Extraterritorial | 2026 |
| Haydon Hill Advisors Limited | Financial services | 2010 |
| HB Recruitment Ltd | Administrative & support | 2026 |