| G H Glass Limited | Professional & scientific | 2018 |
| G H Security Systems Ltd | Administrative & support | 2020 |
| G J Lamb Limited | Hospitality | 2025 |
| G K Leaver Plumbing & Heating Limited | Construction | 2026 |
| G SLY Holdings Ltd | Financial services | 2019 |
| G Smith and Sons Ltd | Construction | 2022 |
| G&B Cleaning Ltd | Administrative & support | 2021 |
| G&B Cleaning-Ironing Service Ltd | Administrative & support | 2021 |
| G&B Domestic Cleaning Services Ltd | Administrative & support | 2024 |
| G&J Couriers Ltd | Transport & logistics | 2025 |
| G. Atkin Limited | Administrative & support | 2003 |
| G. R. Merchant Limited | Professional & scientific | 2006 |
| G.& D.Engineering(Moulton)Limited | Manufacturing | 1968 |
| G.C. Mowbray Limited | Agriculture & fishing | 1954 |
| G.H.Hoyles,Limited | Agriculture & fishing | 1954 |
| G.H.Myers Limited | Agriculture & fishing | 1964 |
| Gabara Trans Limited | Transport & logistics | 2015 |
| Gabrielius Trans Ltd | Transport & logistics | 2015 |
| Gaca Ltd | Transport & logistics | 2021 |
| Gaelle Medical Ltd | Health & social care | 2011 |
| Gafico Ltd | Financial services | 2022 |
| Galactic Gnome Ltd | Information & communication | 2023 |
| Gale Force Tyres Ltd | Wholesale & retail | 2014 |
| Galliano's Trading Limited | Hospitality | 2014 |
| Gama Trans Ltd | Transport & logistics | 2015 |
| Gamekeeper Close Holbeach (Management Company) Limited | Households | 2018 |
| Garn Logistics Ltd | Transport & logistics | 2025 |
| Garn Transport Limited | Wholesale & retail | 1995 |
| Garner Property Limited | Real estate | 2024 |
| Garners Wharf Management Company Limited | Administrative & support | 1987 |
| Garretts Place Ltd | Households | 2021 |
| Gary Naylor Photography Limited | Professional & scientific | 2014 |
| GAS24LINE Ltd | Construction | 2025 |
| Gaskin Property Group Ltd | Construction | 2024 |
| Gatecastle Limited | Financial services | 2010 |
| Gateway South Management Limited | Real estate | 2015 |
| Gateway Transport Services Ltd | Transport & logistics | 2007 |
| Gattonero Digital Ltd | Information & communication | 2021 |
| Gauntlet Services (Lincs) Limited | Transport & logistics | 2010 |
| Gavia Green Limited | Administrative & support | 2008 |
| GB & EB Holdings Ltd | Financial services | 2025 |
| GB DEX Ltd | Wholesale & retail | 2024 |
| GB Electrical Services Ltd | Construction | 2008 |
| GB Monitoring Limited | Administrative & support | 1999 |
| GB Moution Ltd | Wholesale & retail | 2019 |
| GB Tech Pro Ltd | Information & communication | 2015 |
| GB1VAN Ltd | Transport & logistics | 2017 |
| GBK Trans Ltd | Transport & logistics | 2020 |
| Gbsg (Guarding) Ltd | Administrative & support | 1990 |
| Gbsg Ltd | Administrative & support | 1983 |
| Gbstech Ltd | Construction | 2023 |
| GCW Store Limited | Wholesale & retail | 2020 |
| GD Construction Peterborough Ltd | Construction | 2022 |
| GD Tree and Gardens Specialist Ltd | Administrative & support | 2023 |
| GDG Engineering Management Services Limited | Administrative & support | 2021 |
| GDP Solutions Ltd | Professional & scientific | 2016 |
| GED Trans Limited | Transport & logistics | 2016 |
| Gedney Bulb Company Ltd | Wholesale & retail | 2003 |
| GEE Commercials Ltd | Wholesale & retail | 2019 |
| Geeks+ IT Solutions Ltd | Manufacturing | 2013 |
| GEM Minted Ltd | Wholesale & retail | 2026 |
| Gemaro Logistics Solutions Ltd | Transport & logistics | 2017 |
| Gemfresh Limited | Administrative & support | 2025 |
| Gemini Management (Cambs) Limited | Real estate | 2000 |
| GEN 2 Ltd | Real estate | 2019 |
| GEN2TOOLS Ltd | Wholesale & retail | 2025 |
| General Property Maintenance Genie Ltd | Real estate | 2025 |
| Generation Roofing and Renovations Ltd | Construction | 2025 |
| Generoso Consultancy Ltd | Professional & scientific | 2022 |
| Genesis Portfolio Limited | Real estate | 2019 |
| Genpower Support Ltd | Administrative & support | 2023 |
| GEO Home Maintenance Ltd | Administrative & support | 2024 |
| Geoffrey Collings (Long Sutton) Ltd | Real estate | 2024 |
| Geofloor Services Ltd | Other services | 2016 |
| George Barnsdale & Sons Limited | Manufacturing | 1990 |
| George Barnsdale Commercial Limited | Construction | 2001 |
| George Barnsdale Franchising Limited | Professional & scientific | 2013 |
| George Eski Ltd | Transport & logistics | 2017 |
| George HAY & Sons Limited | Agriculture & fishing | 1959 |
| George HAY Company Limited | Professional & scientific | 1982 |
| George Kitchen Plumbing & Heating Limited | Construction | 2017 |
| Georgian M T Limited | Transport & logistics | 2016 |
| Georgiepig Limited | Information & communication | 2018 |
| Geosirbubesttransport. Ltd | Transport & logistics | 2019 |
| Gerrans & Snart Holdings Ltd | Financial services | 2023 |
| GF Automotive Services Limited | Wholesale & retail | 2018 |
| GGB Therapy Limited | Health & social care | 2025 |
| GGM Transport Ltd | Transport & logistics | 2026 |
| GHB Enterprises Limited | Financial services | 2018 |
| Giannikos Trans Ltd | Transport & logistics | 2016 |
| Gibbard Automotive Limited | Wholesale & retail | 2026 |
| Gibbs of Spalding | Wholesale & retail | 1950 |
| Gibbs Removals Ltd | Transport & logistics | 2016 |
| Gibfab Limited | Other services | 2024 |
| Gifts Online 4 U Ltd | Manufacturing | 2013 |
| Gilbert Greenfield Holdings Ltd | Financial services | 2023 |
| Gillies Property Ltd | Construction | 2020 |
| Ginalyn Health Care Ltd | Health & social care | 2023 |
| Gingiface Productions Ltd | Arts & recreation | 2024 |
| Giol Ltd | Professional & scientific | 2015 |