| Jeff Way Group Limited | Extraterritorial | 2016 |
| Jeff Way Training Limited | Education | 2008 |
| Jeff's VW Shack Ltd | Wholesale & retail | 2010 |
| Jefferis Engineering Ltd | Construction | 2017 |
| Jefferis Group Limited | Financial services | 2025 |
| Jefferis Property Group Limited | Financial services | 2025 |
| Jefferis Talent Solutions Ltd | Administrative & support | 2024 |
| Jefferson Tiley Ltd | Administrative & support | 2011 |
| Jeffsayshi Production Limited | Information & communication | 2022 |
| Jeflock Limited | Manufacturing | 2003 |
| Jefnaturals Ltd | Health & social care | 2021 |
| JEG Engineering Limited | Administrative & support | 2007 |
| Jeglon Ltd | Real estate | 2012 |
| JEH Developments Limited | Construction | 2017 |
| JEH Electrical Services Ltd | Construction | 2026 |
| JEK Fabrications Limited | Manufacturing | 2011 |
| Jekis Limited | Wholesale & retail | 2024 |
| Jekka Enterprises Limited | Information & communication | 1995 |
| Jekka's Limited | Agriculture & fishing | 2022 |
| Jeklan Day Services Ltd | Wholesale & retail | 2016 |
| JEL Consultancy (SW) Ltd | Health & social care | 2024 |
| Jelca HR Limited | Administrative & support | 2023 |
| Jelcs Limited | Information & communication | 2025 |
| Jelder Limited | Professional & scientific | 2017 |
| Jelli Records Limited | Arts & recreation | 2008 |
| Jellia Healthcare Ltd | Health & social care | 2020 |
| Jelly Penguin Productions Limited | Arts & recreation | 2012 |
| Jelly Trading Ltd | Other services | 2022 |
| Jellyfish Films Limited | Information & communication | 2014 |
| Jellyhead Studios Ltd | Manufacturing | 2011 |
| JEM Capital Limited | Professional & scientific | 2017 |
| JEM Vinas Ltd | Professional & scientific | 2015 |
| Jemima Bartholomew Ltd | Information & communication | 2023 |
| Jemima Cole Gardening Ltd | Administrative & support | 2022 |
| Jemima Lumley Jewellery Limited | Arts & recreation | 2013 |
| Jemm Property Limited | Real estate | 2025 |
| Jemma Wadham Limited | Arts & recreation | 2020 |
| Jemz Rental Ltd | Real estate | 2024 |
| JEN Reid Limited | Wholesale & retail | 2026 |
| Jencan Limited | Wholesale & retail | 1994 |
| Jenergy Limited | Arts & recreation | 2025 |
| Jeng Enterprise Ltd | Transport & logistics | 2025 |
| Jeni Nott Photography Limited | Professional & scientific | 2020 |
| Jenjin AI Ltd | Information & communication | 2025 |
| Jenkin Advisory Limited | Professional & scientific | 2024 |
| Jenkinson Freight Limited | Transport & logistics | 1990 |
| Jenku@Fam Limited | Health & social care | 2017 |
| Jennett & Co. Limited | Professional & scientific | 2011 |
| Jenni's Beauty Room Limited | Other services | 2019 |
| Jennifer L Cahill Ltd | Extraterritorial | 2015 |
| Jennifer Rose Property Ltd | Real estate | 2022 |
| Jenny Accountancy 888 Ltd | Professional & scientific | 2025 |
| Jenny Hughes Hypnotherapy Ltd | Health & social care | 2026 |
| Jenny Kate Limited | Professional & scientific | 2017 |
| Jenny Smith & Co Limited | Professional & scientific | 2002 |
| Jenny Thai 9 Limited | Hospitality | 2020 |
| Jennyhayley Ltd | Wholesale & retail | 2024 |
| Jenruv Properties Ltd | Real estate | 2022 |
| Jensen Automobiles Limited | Extraterritorial | 2019 |
| Jensen INK Ltd | Information & communication | 2012 |
| Jepy Service Limited | Professional & scientific | 2024 |
| Jeremel Ltd | Real estate | 2022 |
| Jeremy Associates Limited | Professional & scientific | 2022 |
| Jeremy Construction Ltd | Construction | 2016 |
| Jeremy DEO Limited | Financial services | 2022 |
| Jeremy Floyd Associates Limited | Professional & scientific | 2004 |
| Jeremy Key Ltd | Construction | 2014 |
| Jeremy Twigg Consulting Limited | Health & social care | 2024 |
| Jerifleet Limited | Transport & logistics | 2024 |
| Jerk King Bristol Ltd | Hospitality | 2021 |
| Jerningham Management RTM Company Ltd | Households | 2021 |
| Jerram Foundation CIC | Arts & recreation | 2024 |
| Jerry Cleaners Ltd | Administrative & support | 2019 |
| Jerry Dart Limited | Construction | 1982 |
| Jersey Developments Ltd | Construction | 2017 |
| Jeruma Ltd | Administrative & support | 2024 |
| Jerusalem Falafel, Baba Ganoush Kitchen Bristol Ltd | Hospitality | 2019 |
| Jesmond Allen Ltd | Information & communication | 2016 |
| Jesmond Crescent Properties Ltd | Real estate | 2025 |
| Jess Ventures Ltd | Financial services | 2021 |
| Jess Knight Psychology Ltd | Education | 2025 |
| Jesse Campbell Eventing Limited | Arts & recreation | 2017 |
| Jessgoldproperty Limited | Real estate | 2020 |
| Jessica Crane Ltd | Administrative & support | 2015 |
| Jessica Girvan Limited | Administrative & support | 2026 |
| Jessica Hallier Editor Limited | Information & communication | 2021 |
| Jessica Jefferies Casting Ltd | Administrative & support | 2020 |
| Jessica’S Flower Box Ltd | Wholesale & retail | 2021 |
| Jessie DE Salis Limited | Manufacturing | 2020 |
| Jessie's Button Box Limited | Wholesale & retail | 2019 |
| Jessray Healthcare Ltd | Health & social care | 2022 |
| Jestin Haulage Limited | Transport & logistics | 2025 |
| Jestransport Ltd | Transport & logistics | 2020 |
| Jesus Cares Christian Fellowship Limited | Other services | 2014 |
| JET & Shine Bristol Ltd | Administrative & support | 2025 |
| JET Elec Services Ltd | Construction | 2018 |
| JET Integrity Limited | Wholesale & retail | 2022 |
| JET Shoes Ltd | Wholesale & retail | 2015 |
| Jet-Space Consulting Limited | Professional & scientific | 2013 |
| Jethwa Capital Limited | Financial services | 2025 |