| Jathbe Ltd | Sandbach | 2019 |
| JAY Kays Care Limited | Mansfield | 2026 |
| Jay&Syra Ltd | London | 2023 |
| Jay's Home Support Services Ltd | Milford Haven | 2024 |
| Jaya.S Limited | Birmingham | 2021 |
| Jaydrienne Limited | Pontefrac | 2025 |
| Jaysass Limited | Carlisle | 2024 |
| Jaytams Services Limited | London | 2023 |
| Jazzy Scotland Ltd | Glasgow | 2020 |
| Jbdt Test Ltd | Glasgow | 2020 |
| Jbgc Ltd | Berkshire | 2022 |
| JBM TM Ltd | Doncaster | 2024 |
| JC Dell Ltd | Nottingham | 2022 |
| JC Fire Maintenance Ltd | Christchurch | 2021 |
| JCB Military Limited | Uttoxeter | 2026 |
| JCB Passive Fire Ltd | Southam | 2025 |
| Jcb-Universal Specialist Care Services Ltd | Potters Bar | 2021 |
| JCE EMY Ltd | Bristol | 2023 |
| JCE Medicals Ltd | London | 2023 |
| JCH Safety Ltd | Stoke Golding | 2014 |
| Jcolt Support Solutions Ltd | Romford | 2024 |
| Jcos Defence Limited | Kingsbridge | 2025 |
| Jcos Defense Limited | Weston-Super-Mare | 2024 |
| JD & JJ Stella Maris Limited | Bromley | 2022 |
| JD Health & Safety Ltd | Colchester | 2013 |
| Jd-Fire & Safety Limited | Barry | 2024 |
| JDA Fire Ltd | Dronfield | 2025 |
| JDC Project Consultants Limited | Barrow-In-Furness | 2018 |
| JDK Fire Ltd | Dartford | 2023 |
| Jdmabb Services Ltd | Salisbury | 2024 |
| JDS Care UK Limited | Fforestfach | 2019 |
| Jdsw International Ltd | Armagh | 2025 |
| Jebline Limited | London | 2018 |
| Jedd Panford (UK) Ltd | Manchester | 2020 |
| Jed’S Careservices Limited | Gloucester | 2023 |
| Jeentex Global Services Limited | London | 2014 |
| Jeffmay Ltd | Northampton | 2018 |
| JEG Services Limited | London | 2021 |
| JEM Property Services London Ltd | Ilford | 2024 |
| Jenifah Mushayi Ltd | Birmingham | 2025 |
| Jenkins Fire Safety Ltd | Carnoustie | 2019 |
| Jenkinson Intelligence Consultancy Ltd | Grantham | 2025 |
| Jenna Martin Recruitment Limited | Romford | 2026 |
| Jenner Medical Consultancy Ltd | Feltham | 2023 |
| Jerac Ltd | Feltham | 2022 |
| Jernice Care Limited | Corby | 2023 |
| Jess Foresight Healthcare Limited | Basildon | 2021 |
| Jessie’S Home Care Limited | Essex | 2024 |
| JET Care Limited | Nottingham | 2024 |
| Jetlife Limited | Telford | 2015 |
| Jetset Medics Ltd | Wirral | 2019 |
| Jevade TM Ltd | Newport | 2024 |
| Jevna Limited | London | 2019 |
| Jewel Passive Fire Protection Ltd | Surbiton | 2019 |
| Jews for Justice for Palestinians Ltd | London | 2012 |
| Jeyandra Legal Limited | Stanmore | 2025 |
| JF Interim Ltd | Harrogate | 2018 |
| Jfloodcare Limited | Liverpool | 2025 |
| JGS Fire Safety Ltd | Basildon | 2016 |
| JH - Strength Solution Ltd | Ebbw Vale | 2022 |
| JHD Fire Protection Contractors Limited | Kingswinford | 2020 |
| JHK Fire Safety Ltd | Wirral | 2022 |
| Jhona.Pesario Limited | Swansea | 2023 |
| JI Nuclear Safety Management Ltd | Wymondham | 2024 |
| Jido Group Ltd | Leyland | 2026 |
| Jigsaw Safety & Design Limited | Middlesbrough | 2015 |
| Jilly and MAY Limited | Nottingham | 2026 |
| JIM & MO Holdings Limited | Hornchurch | 2022 |
| JIM Alexander Consultancy Limited | St Neots | 2010 |
| Jimseng Limited | Harrow | 2020 |
| Jinzhen Health Care Ltd | Kingston Upon Thames | 2026 |
| Jistqa Limited | Manchester | 2025 |
| JJ Starlight Care Ltd | Tamworth | 2018 |
| Jj.Jessy Ltd | London | 2022 |
| JJF Coding Limited | Watford | 2015 |
| Jjhaven Limited | Southampton | 2022 |
| JJK Sibanda Private Limited | Cardiff | 2020 |
| JKD Health Ltd | Bedford | 2024 |
| JKG Blessing Ltd | London | 2020 |
| JKG Fire Protection & Services Ltd | Aberdeen | 2026 |
| Jkins Healthcare Limited | London | 2017 |
| JKL Care Service Ltd | Hamilton | 2019 |
| JKM HR Consulting Limited | Liskeard | 2016 |
| JKP BIZ Services Ltd | Swindon | 2022 |
| JKS Assessments Limited | Harpenden | 2017 |
| JL Care Services Ltd | Filey | 2021 |
| JL Football Event Management Limited | Plymouth | 2026 |
| JLA Fire & Security Limited | Sowerby Bridge | 2008 |
| JLE U.K. Ltd | London | 2021 |
| JLJ Fire Engineering Ltd | Rochdale | 2018 |
| Jlrf Consulting Ltd | Bury St. Edmunds | 2023 |
| JLT Care Limited | Rochdale | 2022 |
| JM Fire Safety Services Ltd | Thornton Heath | 2024 |
| JM Sherratt Services Ltd | Hyde | 2013 |
| JMC Fire Ltd | Hornchurch | 2018 |
| JMS Planning & Development Ltd | Halesworth | 2015 |
| JNO Healthcare Plus Ltd | Chilmington Green | 2022 |
| JNS Advisory Limited | Abingdon | 2023 |
| Joanna Opiat-Iwan Ltd | Basingstoke | 2023 |
| Joanne P English Ltd | London | 2024 |