| Fynn Investment Properties Limited | Real estate | 2014 |
| Fynn Properties Limited | Real estate | 2013 |
| FZ Enterprises Limited | Wholesale & retail | 2021 |
| FÀS Consulting Limited | Professional & scientific | 2021 |
| G & a Group (Luton) Limited | Financial services | 2023 |
| G & G Eneral Building Construction Limited | Construction | 2014 |
| G & K Emmanuel Ltd | Health & social care | 2022 |
| G & M New Co NO 1 Limited | Extraterritorial | 2022 |
| G & M New Co NO 2 Limited | Extraterritorial | 2022 |
| G & P Limited | Wholesale & retail | 2002 |
| G & S Contracting Limited | Construction | 2008 |
| G & Y Plumbing & Heating Limited | Construction | 2009 |
| G a Building Company Ltd | Construction | 2023 |
| G Abella (Installation and Maintenance Engineers) Limited | Construction | 2015 |
| G and V Trans Limited | Transport & logistics | 2018 |
| G Combinator Ltd | Hospitality | 2024 |
| G Commercial Limited | Real estate | 2016 |
| G D Performance Limited | Other services | 2017 |
| G D Plaeasu Ltd | Transport & logistics | 2018 |
| G F Drylining Limited | Construction | 2018 |
| G Force Branding Ltd | Wholesale & retail | 2025 |
| G Gill Freight Ltd | Transport & logistics | 2020 |
| G H Installation Services Ltd | Construction | 2023 |
| G Heritage Limited | Health & social care | 2014 |
| G Infotech Ltd | Information & communication | 2025 |
| G Kullar Contractors & Plant Hire Ltd | Construction | 2009 |
| G Kullar Payroll Limited | Professional & scientific | 2021 |
| G M Components Limited | Manufacturing | 2013 |
| G N Carpentry Construction Ltd | Construction | 2011 |
| G ROU Ltd | Transport & logistics | 2025 |
| G Steelfixing Ltd | Construction | 2021 |
| G T Cleaning Services Limited | Administrative & support | 2005 |
| G T I Glazing Limited | Construction | 2015 |
| G Transport Services Ltd | Construction | 2023 |
| G Vetere Limited | Administrative & support | 2007 |
| G W D Performance Ltd | Arts & recreation | 2016 |
| G W D Property Limited | Real estate | 2018 |
| G W D Sandy Limited | Arts & recreation | 2025 |
| G W D Yoga Limited | Education | 2021 |
| G W Q Properties Ltd | Real estate | 2024 |
| G&A Drylining Ltd | Construction | 2020 |
| G&A Entertainment & Production Ltd | Arts & recreation | 2024 |
| G&A Fast Food Ltd | Hospitality | 2019 |
| G&A Fibre Ltd | Construction | 2025 |
| G&A Plastering (UK) Ltd | Construction | 2014 |
| G&A SFC Ltd | Hospitality | 2022 |
| G&A Super Store Ltd | Wholesale & retail | 2023 |
| G&Aa(Holdings) Limited | Financial services | 2025 |
| G&C Courier Ltd | Transport & logistics | 2024 |
| G&Co PAY Ltd | Administrative & support | 2023 |
| G&D Contractors Limited | Construction | 2025 |
| G&G Food & Wine Ltd | Wholesale & retail | 2024 |
| G&G Teleground Ltd | Construction | 2025 |
| G&K Rendering Solutions Ltd | Construction | 2026 |
| G&L Clothes Ltd | Water & waste | 2025 |
| G&M Garden Services Ltd | Administrative & support | 2024 |
| G&S Building Services Ltd | Construction | 2025 |
| G&W Traders Ltd | Wholesale & retail | 2023 |
| G-G Carstoaia Fitting Ltd | Construction | 2016 |
| G-Unit 04 Limited | Transport & logistics | 2018 |
| G. Kullar Construction Limited | Construction | 2004 |
| G.K. House Ltd | Construction | 2023 |
| G.O Gardening Solutions Ltd | Administrative & support | 2026 |
| G.O Roofing Solutions Ltd | Construction | 2026 |
| G.R. Proctor Limited | Construction | 2003 |
| G.R.F. Engineering Limited | Manufacturing | 1982 |
| G.S.R Solutions Ltd | Real estate | 2008 |
| G.V.Georgiev Ltd | Construction | 2014 |
| G1 Autos Ltd | Wholesale & retail | 2025 |
| G4 Ventures Limited | Hospitality | 2012 |
| G4 Ventures the Peterborough Arms Limited | Hospitality | 2023 |
| G7 Automation and Security Ltd | Administrative & support | 2020 |
| G7S Logistics Limited | Transport & logistics | 2026 |
| G8 Security & Management Services Ltd | Administrative & support | 2019 |
| GA & D Trans Ltd | Transport & logistics | 2020 |
| GA Hotel Services Limited | Real estate | 2015 |
| GA Living Spaces Ltd | Construction | 2017 |
| GA Recovery Ltd | Transport & logistics | 2025 |
| Ga&S Ltd | Transport & logistics | 2019 |
| Gabajavi Solutions Limited | Information & communication | 2021 |
| Gabby Cleaning Limited | Administrative & support | 2020 |
| Gabelle Limited | Other services | 2018 |
| Gabelle Properties Ltd | Real estate | 2019 |
| Gabelle Property Management Ltd | Real estate | 2020 |
| Gabelle Real Estates Ltd | Real estate | 2021 |
| Gabi Construction Ltd | Construction | 2025 |
| Gabo Enterprise Ltd | Health & social care | 2010 |
| Gabos Capital Limited | Financial services | 2025 |
| Gabos Ltd | Wholesale & retail | 2025 |
| Gabriel Colnic Limited | Professional & scientific | 2026 |
| Gabriel Rendering Ltd | Construction | 2024 |
| Gabserv Ltd | Transport & logistics | 2016 |
| Gach Technologies Ltd | Information & communication | 2025 |
| Gadget Exchange Ltd | Administrative & support | 2018 |
| Gadgetgo Limited | Information & communication | 2024 |
| Gadgetherouk Ltd | Wholesale & retail | 2026 |
| Gadgethive Ltd | Wholesale & retail | 2025 |
| Gaffney Business Solutions Limited | Professional & scientific | 2025 |
| Gaganchhina Ltd | Construction | 2019 |
| Gainsborough Court (Stockingstone Road, Luton) Management Limited | Households | 1971 |