| Gary James Partners Limited | Construction | 2005 |
| Gary Sands Limited | Wholesale & retail | 2026 |
| Gastech & Plumbing Solutions Ltd | Construction | 2024 |
| Gateway Community Media Community Interest Company | Information & communication | 2006 |
| Gateway Contracts Ltd | Construction | 2011 |
| Gateway Services Essex Limited | Other services | 2025 |
| Gators Finance Associates Limited | Transport & logistics | 2015 |
| Gaughan Building Services Ltd | Construction | 2012 |
| Gaughan Facilities Ltd | Construction | 2014 |
| GAV Group Ltd | Construction | 2017 |
| Gavmarcus Health Care Limited | Health & social care | 2013 |
| Gavril Costel Limited | Wholesale & retail | 2025 |
| Gazz-Matic International Limited | Manufacturing | 2000 |
| GB Contract Services Ltd | Construction | 2020 |
| GB Investment Specialists Ltd | Financial services | 2025 |
| GB Logics Ltd | Transport & logistics | 2022 |
| GB Management Holdings Ltd | Financial services | 2024 |
| GB Plating Limited | Professional & scientific | 2009 |
| GB Properties (Essex) Ltd | Real estate | 2024 |
| GBJ Estates Ltd | Real estate | 2023 |
| GBL Group Ltd | Professional & scientific | 2019 |
| GBM Grounds Maintenance Limited | Administrative & support | 2025 |
| GBN Property Management Ltd | Construction | 2026 |
| Gbone Construction Ltd | Construction | 2019 |
| GBU Pro Ltd | Professional & scientific | 2012 |
| Gbuk Property Limited | Real estate | 2022 |
| GC Healthcare Services Limited | Health & social care | 2023 |
| GC Valeting Ltd | Wholesale & retail | 2023 |
| GCA Fire & Security Ltd | Administrative & support | 2016 |
| GCI Transport Ltd | Transport & logistics | 2019 |
| GDP Maintenance Limited | Construction | 2018 |
| GE Plumbing Limited | Construction | 2011 |
| Gecko Estate Agents Ltd | Construction | 2014 |
| Gecko GAS Ltd | Construction | 2020 |
| GEF Construction Ltd | Construction | 2015 |
| GEF Maintenance Ltd | Construction | 2015 |
| Gemini Business Solutions AC Ltd | Administrative & support | 2020 |
| Gemini Events Limited | Other services | 2019 |
| Gemini Foods Ltd | Wholesale & retail | 2020 |
| Gemini Lifting Services Limited | Construction | 2022 |
| Gemini Road Services Limited | Transport & logistics | 2026 |
| Gemz Threadz Limited | Wholesale & retail | 2020 |
| GEN Z Ltd | Wholesale & retail | 2024 |
| General Advertising & Marketing Measurement & Analysis Associates Limited | Information & communication | 1981 |
| Genesis Corporation Ltd | Manufacturing | 2016 |
| Genesis Fitness Training Ltd | Education | 2015 |
| Genesis INT Ltd | Professional & scientific | 2017 |
| Genesis Jewellery Repairs Limited | Other services | 2025 |
| Genesis Mortgage Funding 2022-1 PLC | Financial services | 2021 |
| Genesis Services Group Limited | Construction | 2023 |
| Genius Engineering Consultants Ltd | Professional & scientific | 2020 |
| Geniuslead U.K PVT Ltd | Information & communication | 2012 |
| Gennesaret Ltd | Administrative & support | 2024 |
| Gentle AI Limited | Information & communication | 2023 |
| Gentle Lily Care Ltd | Hospitality | 2024 |
| Gentleman Golf Ltd | Wholesale & retail | 2021 |
| Genuinephoneparts Ltd | Wholesale & retail | 2023 |
| GEO Design Media Ltd | Professional & scientific | 2020 |
| GEO Roof Limited | Construction | 2018 |
| Geoana Limited | Transport & logistics | 2018 |
| Geolea Transport Ltd | Transport & logistics | 2022 |
| Geolina Consult Ltd | Health & social care | 2021 |
| George Buckingham Properties Limited | Real estate | 2000 |
| George Leonard Investments Limited | Real estate | 2022 |
| George Martin Limited | Construction | 1962 |
| George Mayrose Developments Ltd | Real estate | 2025 |
| George Smeddles Limited | Information & communication | 2019 |
| George's Motors Limited | Wholesale & retail | 2015 |
| Georgia's Wardrobe Limited | Other services | 2023 |
| Georoof Holdings Limited | Professional & scientific | 2023 |
| Gerda Truubon Limited | Professional & scientific | 2014 |
| German Cars Specialist London Ltd | Construction | 2019 |
| German Kitchens Limited | Other services | 1985 |
| Gernate Ltd | Real estate | 2024 |
| Gesl Limited | Transport & logistics | 2016 |
| GET Ahead Coaching Limited | Education | 2012 |
| GET Plastered With JGS Limited | Construction | 2015 |
| Getaway Vehicles Ltd | Other services | 2022 |
| GF Civil Contracts Limited | Construction | 2016 |
| GGC International III Ltd | Professional & scientific | 2019 |
| GGC UK Holdings II Limited | Professional & scientific | 2023 |
| GGC UK Holdings Ltd | Professional & scientific | 2019 |
| Gheorghe and Sons Electrical Installation and Services Limited | Other services | 2016 |
| GHG Construction Limited | Construction | 2016 |
| GHG Housing Ltd | Real estate | 2022 |
| GHL Logistics Limited | Transport & logistics | 2012 |
| GHM Solutions Ltd | Construction | 2010 |
| Ghmg Construction Limited | Construction | 2018 |
| GHY Services Limited | Other services | 2014 |
| Gianny M21 Ltd | Transport & logistics | 2016 |
| Gibbs Tanning & Beauty Ltd | Wholesale & retail | 2016 |
| Gibraltar Trading Company Ltd | Wholesale & retail | 2023 |
| Gibson & Brennan Lettings Ltd | Real estate | 2022 |
| Gibson & Brennan Ltd | Real estate | 2021 |
| Gibson Barton Ltd | Real estate | 2025 |
| Gibsons Investments Limited | Real estate | 2024 |
| Gibsons Surveyors Ltd | Professional & scientific | 2021 |
| Gidea Park (Rental) Properties Limited | Financial services | 2017 |
| Gifteffects UK Private Ltd | Extraterritorial | 2018 |
| GIL Services Ltd | Construction | 2021 |