| Giddiup Limited | New Malden | 2019 |
| Giddy Aunt Comedy Ltd | London | 2021 |
| Giddy Photo Booths Limited | March | 2016 |
| Giddy UP Limited | Warminster | 2025 |
| Gidea Park Lawn Tennis Club | Billericay | 2003 |
| Gideon Berger Studio Ltd. | London | 2021 |
| Gideon Prins Design & Animation Limited | London | 2015 |
| Gideon Reeling Limited | London | 2006 |
| Gideon Summerfield Limited | Barnet | 2026 |
| Giffard Race Team Ltd | Eastbourne | 2023 |
| Gifford Community Land Company | Haddington | 2006 |
| Gifford Dance Academy Limited | Lancaster | 2024 |
| Giffster Media Ltd | Sandy | 2015 |
| Gift Competitions Ltd | Hawick | 2020 |
| Gift Engraver Limited | Castle Douglas | 2011 |
| Gift Wrapped Events Ltd | Reigate | 2019 |
| Giftcircle Limited | Warrington | 1991 |
| Gifted 10 Ltd | Bracknell | 2023 |
| Gifted Creative Concepts Limited | Preston | 2024 |
| Gifted Duck Limited | London | 2001 |
| Giftshareglobal Ltd | London | 2025 |
| Gifty Productions Limited | Lancing | 2020 |
| Giftzncardz Limited | London | 2012 |
| GIG Foot Touring Ltd | Leeds | 2014 |
| GIG International Limited | London | 2017 |
| GIG Search Ltd | Staines-Upon-Thames | 2017 |
| Gig-A-Bull Limited | Cambridgeshire | 2007 |
| Gig-Arts | Moreton-In-Marsh | 2013 |
| Giga Space Limited | London | 2022 |
| Gigabyte Studio Ltd | London | 2025 |
| Gigantic Events Ltd | Stockport | 2023 |
| Gigantic Worx Foundation Limited | Epsom | 2020 |
| Gigaro Ltd | London | 2025 |
| Gigatel Cyfyngedig | Caernarfon | 1994 |
| Gigballot Ltd | Bristol | 2025 |
| Gigbreak Ltd | Oxted | 2018 |
| Gigconnecthub Ltd | Hounslow | 2024 |
| Giggle Riot Theatre Ltd | London | 2023 |
| Giggle Street Ltd | Southampton | 2024 |
| Giggle Wiggle & Grow Ltd | Birmingham | 2025 |
| Gigglebeats Limited | Haywards Heath | 2025 |
| Gigglebox Ltd | Plymouth | 2025 |
| Giggles and Games Limited | Wrexham | 2012 |
| Giggles and Knots Limited | Stockport | 2020 |
| Giggles Play and Adventure Ltd | Lancaster | 2012 |
| Gigglewick Creations Ltd | Worthing | 2020 |
| Gigglewick Gifts Ltd | Beverley | 2013 |
| Giggling Kids Limited | Slough | 2020 |
| Giggsmas Limited | London | 2024 |
| Gighive Ltd | Stourbridge | 2025 |
| Gigi Event Studio Ltd | Cumbernauld | 2025 |
| Gigi Holdings Ltd | London | 2022 |
| Gigidygigs Ltd | Abingdon | 2025 |
| Giglight Ltd | London | 2022 |
| Gigmusic Limited | London | 2023 |
| Gigpig Ltd | Manchester | 2022 |
| Gigrep Limited | Manchester | 2015 |
| Gigs Live UK Limited | Nuneaton | 2022 |
| Gigs Might FLY Limited | Buxton | 2018 |
| Gigsandclubs Limited | Sunderland | 2014 |
| Gigstar Production Ltd | London | 2025 |
| Gigstream Ltd | London | 2025 |
| Gigtender Ltd | Faringdon | 2026 |
| Gigz Management Ltd | Hove | 2010 |
| Gihan Arnolda Limited | Toft | 2025 |
| Gihan Arnolda Racing Limited | Bury St. Edmunds | 2026 |
| Gihon Enterprise Limited | Covent Garden | 2017 |
| GIL Carvalho Art Ltd | London | 2013 |
| GIL Live Showband Ltd | Cardiff | 2018 |
| GIL North Limited | Skipton | 2011 |
| Gilbert and George Limited | Pinner | 1984 |
| Gilbert Art Services Ltd | London | 2025 |
| Gilbert Deya Ministries Ltd | Dunoon | 2026 |
| Gilbert Taylor Fitness Ltd | Stevenage | 2025 |
| Gilbert Trust for the Arts | London | 1995 |
| Gilbert White & the Oates Collections | Selborne | 2014 |
| Gilby and Gilby Limited | Croydon | 2008 |
| Gilby Martial Arts Limited | Lichfield | 2024 |
| Gild Restore Limited | Bexhill-On-Sea | 2025 |
| Gildea Fitness Limited | Brentford | 2018 |
| Gilded Balloon Futures Limited | Edinburgh | 2003 |
| Gilded Chameleon Ltd | Whitchurch | 2024 |
| Gilded Orpharion Ensemble Limited | Newcastle Upon Tyne | 2022 |
| Gilded Portraits Limited | Newhaven | 2026 |
| Gilead Global Humanitarians Awards Ltd | Coventry | 2024 |
| Giles Armstrong Limited | Broadstairs | 2021 |
| Giles Chiplin Productions Limited | Salisbury | 2016 |
| Giles Cooper Entertainment Limited | Tenterden | 2016 |
| Giles Davies Design Limited | Derby | 2004 |
| Giles Fireworks Limited | Studley | 2021 |
| Giles Foden Limited | 3 Dorset Rise | 2014 |
| Giles Miller Studio Limited | Grundisburgh | 2011 |
| Gilford Music Limited | Sheffield | 2009 |
| Gilgo Limited | Watford | 2004 |
| Gill Harris Writes Limited | Shrewsbury | 2010 |
| Gill Music Limited | Doncaster | 2010 |
| Gill Nicholas Delusions Ltd | Manchester | 2019 |
| Gill Parker Limited | Redmarley | 2003 |
| Gill Parrott Limited | | 2003 |
| Gill Sports & Entertainment Consultancy Limited | Solihull | 2012 |