| GS Capital Ltd | Wholesale & retail | 2021 |
| GS Construction Management Limited | Construction | 2014 |
| GS Home Solutions Ltd | Construction | 2025 |
| GSD Housing Solutions Ltd | Real estate | 2025 |
| GSD Legal Ltd | Professional & scientific | 2026 |
| GSD Project Ltd | Construction | 2018 |
| GSD Ventures Ltd | Financial services | 2025 |
| GSD Watch Security Limited | Administrative & support | 2016 |
| Gsdr Ltd | Administrative & support | 2025 |
| Gsfbecommerce Ltd | Wholesale & retail | 2022 |
| GSP Solutions (SW) Ltd | Construction | 2023 |
| GST Haulage Co., Ltd | Transport & logistics | 2025 |
| GT & Associates Ltd | Administrative & support | 2019 |
| GT CAL Services Ltd | Professional & scientific | 2026 |
| GT Distribution Ltd | Wholesale & retail | 2025 |
| GT Motorcycles (2012) Ltd | Wholesale & retail | 2012 |
| GT Tourz Limited | Administrative & support | 2016 |
| Gtac Engineering Services Ltd | Wholesale & retail | 2020 |
| Gtccare Ltd | Health & social care | 2026 |
| Gtek Construction Ltd | Construction | 2019 |
| GTH Consulting Ltd | Professional & scientific | 2025 |
| GTR Flats Limited | Real estate | 1997 |
| Guardi Southwest Ltd | Administrative & support | 2023 |
| Guardian Industrial (UK) Limited | Construction | 2005 |
| Guiton's Garage Doors & Gates Ltd | Construction | 2025 |
| Gull Medical Ltd | Professional & scientific | 2024 |
| Gulland Properties Limited | Construction | 1986 |
| Gulnas Ltd | Hospitality | 2024 |
| Gunapro Investments Ltd. | Transport & logistics | 2014 |
| Gunton Group Ltd | Financial services | 2025 |
| Guru Advisory Services Ltd | Financial services | 2023 |
| Guru Digital Marketing Ltd | Professional & scientific | 2019 |
| Guru Express Limited | Hospitality | 2010 |
| Guru Growth Solutions Ltd | Information & communication | 2025 |
| Gutter Cleaning Plymouth Ltd | Other services | 2020 |
| GUY Thomas Evans Ltd. | Administrative & support | 2016 |
| Guyver Ortho Services Ltd | Health & social care | 2016 |
| Guz.Tech Ltd | Administrative & support | 2023 |
| GVT Stores Ltd | Wholesale & retail | 2017 |
| Gwanda Ltd | Real estate | 2017 |
| GWC IP Limited | Construction | 2018 |
| Gwda Ltd | Education | 2017 |
| Gwmr Property Limited | Real estate | 2024 |
| Gwydyr House Services Ltd | Construction | 2014 |
| Gym Equipment 4U Limited | Arts & recreation | 2020 |
| Gypsy Edit Ltd | Information & communication | 2009 |
| Gypsy Glow Limited | Other services | 2026 |
| G’S Flavour Ltd | Hospitality | 2025 |
| H & H Healthcare Limited | Health & social care | 2013 |
| H G Gradidge & Sons Limited | Agriculture & fishing | 1998 |
| H I Properties (Plymouth) Limited | Real estate | 2012 |
| H Putnam Property Ltd | Real estate | 2018 |
| H S Kamaie Ltd | Real estate | 2017 |
| H Watts Family & Co Limited | Wholesale & retail | 2023 |
| H&M Global Food Limited | Hospitality | 2018 |
| H&S Investment Properties Ltd | Real estate | 2018 |
| H-B Ventures Ltd | Other services | 2003 |
| H.T. Gardner Distribution Limited | Transport & logistics | 1993 |
| H.T.P.Motors Limited | Professional & scientific | 1934 |
| H2EAU Sports Ltd | Wholesale & retail | 2015 |
| H2O Group Limited | Manufacturing | 2017 |
| H2O Marine Services Limited | Manufacturing | 2025 |
| Haarer & Motts Limited | Real estate | 2005 |
| Haarer and Motts Estate Agents Ltd | Real estate | 2016 |
| Habisafe Ltd | Manufacturing | 2025 |
| Habitat Renovations Ltd | Administrative & support | 2018 |
| Hackworthy and Sons Limited | Transport & logistics | 2010 |
| Hadel Consulting Ltd | Information & communication | 2018 |
| Hadley Engineering Group Limited | Manufacturing | 2012 |
| Hadley Powder Coatings Limited | Professional & scientific | 2018 |
| Hafborg Limited | Wholesale & retail | 2020 |
| Hair Brands Ltd | Wholesale & retail | 2024 |
| Hair Closures & Frontals UK Ltd | Other services | 2023 |
| Hair Jungle Ltd | Other services | 2011 |
| Hairflair Yealmpton Limited | Other services | 2022 |
| Hairobics Limited | Other services | 2012 |
| Hale Properties Plymouth Limited | Real estate | 2000 |
| Hales Bytes Limited | Information & communication | 2010 |
| Half Pint Home Ltd | Manufacturing | 2014 |
| Hallett Property Services Limited | Real estate | 2020 |
| Hallmark Estates (Devon) Limited | Real estate | 2002 |
| Hallmark Estates South West Limited | Construction | 1998 |
| Hallwell Projects Ltd | Construction | 2010 |
| Hambat Food Ltd | Hospitality | 2026 |
| Hambo House Ltd | Extraterritorial | 2024 |
| Hammerforce UK Limited | Professional & scientific | 2022 |
| Hampshire Dog Security Ltd | Administrative & support | 2018 |
| Hana Baby Slings Ltd | Manufacturing | 2024 |
| Hand Drawn Home Ltd | Construction | 2012 |
| Handlespark Limited | Real estate | 1998 |
| Handsconsultancy (UK) Ltd | Professional & scientific | 2011 |
| Handy Services Ltd | Hospitality | 2022 |
| Hang in OUT (Design) Limited | Wholesale & retail | 2015 |
| Hang-In-Out LLP | | 2011 |
| Hannafords Management Company Limited | Households | 2025 |
| Hannah Burnett Florist Limited | Wholesale & retail | 2016 |
| Hannah Jack Fishing Limited | Agriculture & fishing | 2014 |
| Hannah Robinson Podiatry Limited | Health & social care | 2019 |
| Hannah's Games Ltd | Manufacturing | 2016 |
| Hannium Interactive Limited | Information & communication | 2011 |