| GEM Exerciser Ltd | Ashford | 2017 |
| GEM Forte Limited | Essex | 2016 |
| GEM Hotels (Group) Limited | London | 2019 |
| GEM Hotels (London) Limited | London | 2019 |
| GEM Logistic Solutions Ltd | London | 2019 |
| GEM Parts Ltd | Penzance | 2011 |
| GEM Solutions Limited | Petworth | 1995 |
| Gem-A Strategy Systems Limited | Tunbridge Wells | 2014 |
| Gemeco Ltd | Bourne | 2007 |
| Gemeos Ltd | London | 2019 |
| Gemi Capital Ltd | Bishop'S Stortford | 2015 |
| Gemima Court Management Limited | Coulsdon | 2008 |
| Gemini Books Midco Limited | Manchester | 2026 |
| Gemini Business Consulting Ltd | Cardiff | 2021 |
| Gemini Custom Guns Limited | Bexhill On Sea | 2015 |
| Gemini Grounds Maintenance Ltd | Wokingham | 2011 |
| Gemini Interiors Limited | Watford | 2011 |
| Gemini London Markets Ltd | Hornchurch | 2015 |
| Gemini Services (GB) Limited | Bolton | 2006 |
| Gemini Transcription Ltd | Stanmore | 2012 |
| Gemini Woman Limited | Leamington Spa | 2011 |
| Geminii Blueprint Ltd | Torrington | 2026 |
| Gemma Bell Shelfco Limited | London | 2024 |
| Gemma Coetus Lorem Limited | London | 2013 |
| Gemma Dunne Ltd | Halifax | 2022 |
| Gemmabel Limited | London | 2021 |
| Gemmaland Group Ltd | London | 2014 |
| Gemms International Limited | London | 2000 |
| Gemo Capital Consulting Limited | London | 2008 |
| Gemselect (Ridgewest) Limited | Bexhill | 2015 |
| Gemshot Ltd | Birmingham | 2008 |
| Gemstone Accountancy Ltd | Elgin | 2024 |
| Gemstone Contracting Ltd | Cambridge | 2025 |
| Gemstones & Minerals UK Limited | Harrow | 2021 |
| Gemswick Tech Ltd | Haywards Heath | 2016 |
| Gemtel Limited | Wembley | 2006 |
| Gemway Group Limited | Beckenham | 2016 |
| Gemxit UK Limited | London | 2023 |
| GEN Alpha Education Ltd | Nottingham | 2024 |
| GEN Consultancy Limited | Stroud | 2021 |
| GEN Fit Limited | Chester | 2012 |
| GEN Group Limited | Harrogate | 2020 |
| GEN M Limited | Leeds | 2021 |
| GEN Next International UK Ltd | London | 2016 |
| GEN P Ltd | Bristol | 2025 |
| GEN1US Limited | Harrogate | 2026 |
| Genaiit Ltd | Sidcup | 2024 |
| Gencircleai Ltd | Cardiff | 2024 |
| Genco Asset Management Limited | Birmingham | 2008 |
| Genco Property Limited | Betchworth | 2018 |
| Gencroft Engineers Limited | Lincoln | 1999 |
| Gender Plus Limited | Bradford | 2012 |
| Genderbliss International Ltd | Manchester | 2023 |
| Genel Energy NO.6 Limited | London | 2019 |
| GENER8 AI Ltd | London | 2025 |
| GENER8 Science Limited | Penicuik | 2009 |
| General Applications Limited | Manchester | 2020 |
| General Auto Services Limited | London | 2017 |
| General Clad Co., Ltd | Beckenham | 2015 |
| General Classification Limited | Birmingham | 2010 |
| General Clothing Stores Limited | Falmouth | 2000 |
| General Commercial Objects Limited | Manchester | 2008 |
| General Domestic Appliances International Limited | Watford | 1962 |
| General Emergency Medicine (GEM) Ltd | Swanscombe | 2012 |
| General Engineering Limited | Chester Le Street | 2003 |
| General Finance Limited | Solihull | 1997 |
| General Health-Steiner Limited | London | 2013 |
| General Intelligence PLC | Edinburgh | 1896 |
| General Maintenance Services Limited | Taffs Well | 1982 |
| General Market Supplies Limited | Canterbury | 2015 |
| General Nominees Limited | Salford | 2004 |
| General Paint UK Ltd | Seaham | 2015 |
| General Power International Trade Limited | Stafford | 2013 |
| General Purpose AI Ltd | Lincoln | 2022 |
| General Quarters Limited | London | 2025 |
| General Reversionary and Investment Company(The) | | 1923 |
| General Senses Ltd | Slough | 2015 |
| General Utilities Contracts North West Ltd | Warrington | 2011 |
| Generale DE Sante International Limited | London | 1989 |
| Generate Plant Ltd | Chalfont St Giles | 2023 |
| Generation 16 Limited | London | 2015 |
| Generation Access Limited | West Midlands | 2004 |
| Generation Flooring (Holdings) Limited | Rotherham | 2012 |
| Generation Flooring Limited | Rotherham | 2012 |
| Generation Hire and Sales Limited | West Midlands | 2004 |
| Generation Media Exchange Limited | Henley-On-Thames | 2013 |
| Generation Studio Ltd | Maidenhead | 2021 |
| Generational Future Ltd | London | 2025 |
| Generator Power Systems Limited | Braintree | 2009 |
| Genertek Ltd | London | 2013 |
| Genese Property Maintenance Limited | Witney | 2012 |
| Genesis 1:1 Limited | Radstock | 2024 |
| Genesis 247 Ltd | Kingston Upon Thames | 2002 |
| Genesis Consultant Services Ltd | Northampton | 2017 |
| Genesis Diagnostics Limited | Littleport | 1994 |
| Genesis Finance Group Limited | Glossop | 2017 |
| Genesis Holdings (Hull) Limited | Hull | 2004 |
| Genesis Hotels Ltd | London | 2025 |
| Genesis Industry Limited | Beckenham | 2018 |
| Genesis IT & Telecommunications Limited | Blackburn | 2020 |