| Great Seven Stars Facilities Management Services Limited | Other services | 2021 |
| Greater Sylhet Welfare Association Luton UK Ltd | Health & social care | 2024 |
| Greater Sylhet Welfareassociation Luton Beds UK Limited | Health & social care | 2024 |
| Grecians Services Limited | Information & communication | 2018 |
| Gred Ltd | Education | 2025 |
| Greedyeye Design Ltd | Professional & scientific | 2025 |
| Greek Italian UK Ltd | Other services | 2025 |
| Green 2018 Ltd | Financial services | 2018 |
| Green Butchers Luton Limited | Wholesale & retail | 2020 |
| Green Cross Healthcare Limited | Health & social care | 2011 |
| Green Cube Digital Ltd | Information & communication | 2020 |
| Green Doors and Windows Ltd | Wholesale & retail | 2014 |
| Green Doors Marketplace Ltd | Information & communication | 2026 |
| Green Economy Solution (International) Limited | Professional & scientific | 2022 |
| Green Estates (1999) Ltd | Real estate | 1999 |
| Green Flourishing Limited | Administrative & support | 2021 |
| Green Food International Limited | Hospitality | 2024 |
| Green Globe Properties Ltd | Real estate | 2024 |
| Green Horizon Group Limited | Professional & scientific | 2025 |
| Green Line Facilities Limited | Construction | 2026 |
| Green LIT Pictures Ltd | Information & communication | 2010 |
| Green Meadow Residents Association Limited | Households | 1981 |
| Green Sparkz Electrics Ltd | Construction | 2016 |
| Green Terpenes Ltd | Hospitality | 2018 |
| Greenacres Residential Park Ltd | Real estate | 2020 |
| Greenban Milnow Limited | Manufacturing | 2025 |
| Greenbay Healthcare Ltd | Health & social care | 2022 |
| Greene Executive Cars Limited | Transport & logistics | 2023 |
| Greenfoods INT Ltd | Wholesale & retail | 2019 |
| Greenfork Organics Limited | Wholesale & retail | 2025 |
| Greengrass Infrastructures Limited | Construction | 2025 |
| Greenleaf CS Limited | Administrative & support | 2013 |
| Greenlux Limited | Construction | 2012 |
| Greenparkandride Ltd | Other services | 2023 |
| Greenshow Motors Limited | Wholesale & retail | 2017 |
| Greenside Childcare Ltd | Health & social care | 2017 |
| Greensleaf Limited | Professional & scientific | 2023 |
| Greenview 24/7 Ltd | Health & social care | 2026 |
| Greenway Rail and Power Limited | Construction | 2000 |
| Greenways Properties (Dell Farm) Limited | Construction | 2020 |
| Greenways Properties (Harpenden) Limited | Construction | 2019 |
| Greenways Properties (Residential) Limited | Construction | 2019 |
| Greenwood Court ( Luton) Investments Ltd | Real estate | 2025 |
| Greenwood Court Management Company Limited | Administrative & support | 1982 |
| Greenwood Court UK ( Luton) Investments Ltd | Real estate | 2026 |
| Greenwoods Central Bedfordshire Limited | Extraterritorial | 2020 |
| Greg Knight Security Ltd | Financial services | 2021 |
| Gregory & Hughes Developments Limited | Construction | 2004 |
| Greon Limited | Construction | 2025 |
| Grepes House Ltd | Hospitality | 2015 |
| Grey Innovate Ltd | Information & communication | 2024 |
| Grey Oak Developments Limited | Construction | 2016 |
| Greystone Solicitors Limited | Professional & scientific | 2018 |
| Grgy Ltd | Construction | 2025 |
| Griffin Court (Hitchin) Management Company Limited | Households | 2007 |
| Griffin Properties Limited | Real estate | 2026 |
| Grigi Ltd | Transport & logistics | 2022 |
| Grill 33 Limited | Hospitality | 2019 |
| Grill Cottage Luton Limited | Hospitality | 2024 |
| Grill IS Great Limited | Hospitality | 2018 |
| Grill Kinz UK Ltd | Hospitality | 2025 |
| Grillco.Co Limited | Hospitality | 2019 |
| Grilseco Limited | Real estate | 1993 |
| Grimwade Contracting Limited | Construction | 1991 |
| Grit and Oyster Limited | Information & communication | 1999 |
| Grocery @ Your Door Step Ltd | Hospitality | 2019 |
| Grocery HUT Group Ltd | Wholesale & retail | 2021 |
| Grodt Holdings Ltd | Construction | 2016 |
| Grogan Investments Ltd | Financial services | 2022 |
| Gromarket Ltd | Wholesale & retail | 2025 |
| Groomed.Tails Luton Ltd | Other services | 2026 |
| Grossman Ltd | Health & social care | 2026 |
| Groundlink Cleaning UK Limited | Administrative & support | 2012 |
| Groundstone Developments Ltd | Construction | 2026 |
| Groundstone Services Ltd | Construction | 2019 |
| Group 40 Enterprises Ltd | Wholesale & retail | 2025 |
| Group 53 Limited | Other services | 2018 |
| Group of Deewan Limited | Information & communication | 2025 |
| Group V Holdings Limited | Financial services | 2026 |
| Group V Properties Limited | Real estate | 2026 |
| Group V Technologies Limited | Wholesale & retail | 2026 |
| Groupexec Ltd | Transport & logistics | 2012 |
| Grout Injection Specialists Limited | Construction | 1984 |
| Grove Dyers Limited | Extraterritorial | 1985 |
| Grove Park Construction Ltd | Construction | 2022 |
| Grove Park Development Ltd | Construction | 2021 |
| Grove Park Holdings Ltd | Real estate | 2021 |
| Grove Park Homes Ltd | Real estate | 2021 |
| Groveband Limited | Other services | 2017 |
| Grow Consultants Ltd | Administrative & support | 2023 |
| Grow UP Constructions Limited | Construction | 2025 |
| Grow Your Potential CIC | Health & social care | 2020 |
| Growstone Consult Ltd | Information & communication | 2025 |
| GRR Building Limited | Construction | 2026 |
| Gruia Composites Ltd | Manufacturing | 2022 |
| Grusza Ltd | Construction | 2019 |
| GRV Build Group Ltd | Construction | 2026 |
| Grwthpr Limited | Professional & scientific | 2024 |
| GS Bisla Construction Ltd | Other services | 2015 |
| GS Commercial Repairs Ltd | Wholesale & retail | 2013 |