| GAS Generation GAS Road Limited | Norwich | 2017 |
| GAS Generation Helen Street Limited | Norwich | 2017 |
| GAS Generation Paisley Limited | Bourne | 2017 |
| GAS Generation Property Limited | Bourne | 2017 |
| GAS Generation Retford Road Limited | Norwich | 2017 |
| GAS Generation Well Street Limited | Bourne | 2019 |
| GAS Gods Ltd | Kidderminster | 2020 |
| GAS Haulage Ltd | Benfleet | 2023 |
| GAS King Ltd | Harrogate | 2013 |
| GAS Matters Limited | Marlow | 2003 |
| GAS Safe (Midlands) Limited | Solihull | 2009 |
| GAS Safe Interactive Ltd | Sandbach | 2005 |
| GAS Safety Engineers London Limited | London | 2018 |
| GAS Smart Heating & Cooling Ltd | Buckingham | 2023 |
| GAS Strategies Consulting Limited | Marlow | 2003 |
| GAS Style UK Ltd | Preston | 2002 |
| GAS Vehicle Exchange Limited | Craven Arms | 2015 |
| GAS Vehicle Solutions Limited | Craven Arms | 2015 |
| Gases UK Ltd | Warrington | 2014 |
| Gasgas Motos Ltd | New Mills | 2020 |
| Gaskarth (Altrincham) | North Yorkshire | 1967 |
| Gaskell Group Ltd | Milton Keynes | 2012 |
| Gaskell Mackay Carpets Limited | Hartlepool | 2006 |
| Gaskell Maintain Ltd | Milton Keynes | 2012 |
| Gasm Drinks Limited | Newtown | 2012 |
| Gasper Barn Ltd | London | 2013 |
| Gassteknikk Limited | London | 2010 |
| Gastec at CRE Limited | Cheltenham | 2011 |
| Gaston Payne Dance School Limited | Shrewsbury | 2010 |
| Gastric Bandits Ltd | Harrogate | 2012 |
| Gastrike-Hammarby Fastigheter Limited | London | 2023 |
| Gastronomic Foods Ltd | Bolton | 2019 |
| Gastronomique Cooks Agency Limited | London | 1996 |
| Gaswarm Ltd | Southampton | 2023 |
| Gasworks UK Ltd | London | 2009 |
| GAT Services Limited | Rochester | 2020 |
| Gate Ltd | Gateshead | 2020 |
| Gate Twenty Three Limited | Derby | 2022 |
| Gatebest Farm Limited | London | 2006 |
| Gatehaven Limited | Walton-On-Thames | 2000 |
| Gatehouse Garage Limited | Barnard Castle | 2016 |
| Gatekeeper Homes and Interiors Limited | Bridgwater | 2023 |
| Gatekeeper Limited | Colchester | 1999 |
| Gateley Custodian and Nominee Services NO. 2 Limited | Birmingham | 2009 |
| Gateline Ltd | Gateshead | 2009 |
| Gatenby Media Ltd | Wells | 2022 |
| Gateover Limited | Bridgend | 2024 |
| Gatepay Limited | Gateshead | 2014 |
| Gates and Accessories Limited | Saffron Walden | 2015 |
| Gates Financial Solutions Limited | Harlow | 1938 |
| Gateshead Binyan Ltd | Gateshead | 2011 |
| Gateside Management Company Limited | Portstewart | 2006 |
| Gatestar Limited | Bridgend | 2025 |
| Gatestogo Limited | Nelson | 2008 |
| Gateway 2 London Limited | Harrow | 2013 |
| Gateway Application Limited | Poole | 2012 |
| Gateway Asset Management Limited | Southend-On-Sea | 2020 |
| Gateway Assist Limited | Grimsby | 2013 |
| Gateway Associated Surveying Limited | Southend-On-Sea | 2020 |
| Gateway Business Centre Limited | Redruth | 2015 |
| Gateway Collections UK. Ltd. | Watlington | 1990 |
| Gateway Concierge Limited | London | 2023 |
| Gateway Development Services Limited | Aldershot | 2002 |
| Gateway Developments (Bushby) Limited | Derby | 2007 |
| Gateway Developments (Darley Abbey) Limited | Derby | 2006 |
| Gateway Developments (Derby) Limited | Derby | 2005 |
| Gateway Eastbourne Caterers Association (Geca) Ltd | Pevensey | 2019 |
| Gateway Freeholds Limited | Southend On Sea | 2015 |
| Gateway Ground Rents NO 1 Ltd | Southend On Sea | 2014 |
| Gateway Ground Rents NO 2 Ltd | Southend On Sea | 2014 |
| Gateway Group Holdings Limited | Southend On Sea | 2010 |
| Gateway Holding (NI) Limited | Ballymena | 2005 |
| Gateway Interiors Limited | Eastleigh | 2008 |
| Gateway International Trading Limited | Manchester | 2026 |
| Gateway Lease Advice Limited | Southend-On-Sea | 2020 |
| Gateway Management (Pocklington) Company Ltd | York | 2007 |
| Gateway Optimum Services Limited | Harrow | 2013 |
| Gateway Properties (South East) Limited | Southend On Sea | 2012 |
| Gateway Properties NO. 1 Ltd | Southend On Sea | 2014 |
| Gateway Properties NO. 2 Limited | Southend On Sea | 2013 |
| Gateway Quicksouth Limited | Southend On Sea | 2016 |
| Gateway Realities Ltd | Bristol | 2026 |
| Gateway Shipping Co. Limited | Kent | 1998 |
| Gateway to Being Ltd | Bristol | 2024 |
| Gateway to Sandbanks Ltd | London | 2020 |
| Gateway Ventures Limited | Southend | 1962 |
| Gato Property Ltd | Belfast | 2023 |
| Gator Holdco (UK) Ltd | Fradley Park | 2019 |
| Gator Intermediate Holdco (UK) Ltd | Fradley Park | 2019 |
| Gator Rent Ltd | Preston | 2013 |
| Gatpro Limited | Stourbridge | 2015 |
| Gatsby Court Limited | Birmingham | 2012 |
| Gatsby Video Productions Ltd | Sittingbourne | 2014 |
| Gatts & Company Limited | Aylesbury | 2019 |
| Gatwick Airport Pension Trustees Limited | London Gatwick Airport | 2009 |
| Gatwick Worth Hotel Limited | Horsham | 2004 |
| Gatx European Venture Finance Limited | London | 2000 |
| Gauceu Ltd | Manchester | 2022 |
| Gaudeamus Limited | Buxhall | 2011 |
| Gauge Developments Limited | Stockport | 2015 |