| Jane Cowley Chiropodist Limited | Health & social care | 2012 |
| Jane Grahame Properties Limited | Extraterritorial | 1951 |
| Jansen Metco Limited | Water & waste | 2010 |
| Janus Alarms Limited | Manufacturing | 1996 |
| Japan Limited | Extraterritorial | 2007 |
| Japanese Knotweed Mortgages Limited | Financial services | 2020 |
| Jarailstar Holdings Limited | Financial services | 2022 |
| Jarailstar Limited | Agriculture & fishing | 2021 |
| Jaret Enterprises Ltd | Construction | 2012 |
| Jaribu Global Ltd | Wholesale & retail | 2025 |
| Jartop Limited | Real estate | 2012 |
| Jarvastech Ltd | Information & communication | 2025 |
| Jasmine Close Management Company Limited | Households | 2011 |
| Jaycor Limited | Professional & scientific | 2026 |
| JB CNC Services Limited | Manufacturing | 2005 |
| JB Electrical Contractors Worcester Limited | Manufacturing | 2024 |
| JB Hydraulics Ltd | Manufacturing | 2024 |
| Jb-Sims Ltd | Administrative & support | 2013 |
| Jbabka Inspections Ltd | Professional & scientific | 2011 |
| Jbabka Property & Rentals Ltd | Real estate | 2025 |
| JBG Services Ltd | Administrative & support | 2023 |
| JBP Industries Ltd | Construction | 2014 |
| Jbsmowing Ltd | Administrative & support | 2025 |
| JC Investment Holdings Ltd | Construction | 2022 |
| JC Tours Limited | Administrative & support | 2001 |
| Jclub Events Ltd | Professional & scientific | 2023 |
| JCS22 Ltd | Health & social care | 2012 |
| JDA Design Ltd | Manufacturing | 2015 |
| JDL Operations Ltd | Construction | 2018 |
| JDR (Engineering) Services Ltd | Professional & scientific | 2020 |
| JDW (Holdings) Limited | Administrative & support | 2002 |
| Jedidiah Properties & Co Limited | Real estate | 2018 |
| Jeffreys Holdings Limited | Wholesale & retail | 2021 |
| Jeffreys Properties Limited | Real estate | 2017 |
| JEI Trading Limited | Administrative & support | 2022 |
| Jelly Bean Accountancy Limited | Professional & scientific | 2014 |
| Jengo Sustainable Design Ltd | Professional & scientific | 2021 |
| Jenilag Property Ltd | Real estate | 2022 |
| Jenni Waugh Consulting Ltd | Professional & scientific | 2014 |
| Jennie Marie Ltd | Education | 2025 |
| Jennie Nail HN Limited | Other services | 2025 |
| Jenny Heybourn Ltd | Education | 2021 |
| JEP Projects Limited | Construction | 2008 |
| Jerez (Worcester) Limited | Real estate | 2025 |
| Jespearl Services Limited | Health & social care | 2012 |
| Jessava Estates Ltd | Real estate | 2019 |
| Jessica Jones Lighting Limited | Wholesale & retail | 1996 |
| JET Powered Apps Ltd | Information & communication | 2012 |
| JF Risk Ltd | Professional & scientific | 2020 |
| JGB Active Daycare Limited | Education | 2022 |
| JGB Active Education Ltd | Education | 2025 |
| JGH Classics Ltd | Wholesale & retail | 2020 |
| JH Football Coaching Ltd | Arts & recreation | 2021 |
| Jhahla Constructions Limited | Construction | 2025 |
| JHD Consultancy Limited | Information & communication | 2025 |
| JHD Resources Ltd | Other services | 2023 |
| JHL Substation Services Ltd | Construction | 2026 |
| JHM Business Consulting Limited | Extraterritorial | 2018 |
| JHM Professional Development Consultancy Limited | Education | 2016 |
| JIG JAG Ltd | Professional & scientific | 2025 |
| Jigsaw Tree Ltd | Administrative & support | 2014 |
| Jill Wheelock-Lines Pearls & Fine Jewellery Limited | Wholesale & retail | 2011 |
| JJ Adonis Ltd | Construction | 2023 |
| Jjfmedia Ltd | Professional & scientific | 2018 |
| JJH Builders Limited | Construction | 2015 |
| Jjmc Solutions Limited | Real estate | 2024 |
| JJS Developments (Worcester) Limited | Construction | 2016 |
| JK Restorations Limited | | 2006 |
| Jk's Building Ltd | Construction | 2025 |
| JKP Imagine Ltd | Professional & scientific | 2021 |
| JL Consult Limited | Professional & scientific | 2019 |
| JLG Consultants Limited | Professional & scientific | 2025 |
| JLK UK Technology Limited | Financial services | 2026 |
| JLW Management Services Limited | Other services | 2012 |
| JM Foods & Catering Ltd | Hospitality | 2025 |
| JM Spurling Planning Consultants Limited | Professional & scientific | 2018 |
| JME Construction & Plant Ltd | Construction | 2015 |
| JME Precision Engineering Limited | Manufacturing | 2008 |
| JMG Consulting International Limited | Professional & scientific | 2007 |
| JMG Plastering Ltd | Construction | 2024 |
| JMK Restaurants Limited | Hospitality | 2002 |
| Jmmi Investments Limited | Information & communication | 2025 |
| JMP Elite Ltd | Information & communication | 2021 |
| JMS Associates Ltd | Administrative & support | 2025 |
| Jmsr Limited | Professional & scientific | 2021 |
| Jmtw Ventures Limited | Real estate | 2020 |
| JNB Academy (Stratford Upon Avon) LLP | | 2018 |
| JNB Smart Repairs Ltd | Wholesale & retail | 2019 |
| JO Menhinick Design Limited | Administrative & support | 2003 |
| JO Potts Financial Planning Limited | Professional & scientific | 2019 |
| JOB Ltd | Administrative & support | 2025 |
| Jocella Academics Ltd | Education | 2023 |
| Johansen-Berg Consulting Ltd | Professional & scientific | 2025 |
| Johansen-Berg Personal Investment Company Limited | Extraterritorial | 2021 |
| John Betts & Sons Ltd | Manufacturing | 2019 |
| John Charles Contractors Ltd | Construction | 2022 |
| John Craig Rogers Limited | Construction | 2016 |
| John Drew Consulting Limited | Professional & scientific | 2019 |
| John Hall (Worcester) Limited | | 1962 |
| John Harris Media Ltd | Arts & recreation | 2009 |