| James FX Trading Ltd | Construction | 2023 |
| James Trading Group Limited | Financial services | 2010 |
| Jamm Commercial Holdings Ltd | Real estate | 2020 |
| Jayfor Limited | Administrative & support | 2001 |
| JB Locking Wheel NUT Recovery Limited | Wholesale & retail | 2024 |
| JB Properties + Investments Ltd | Households | 2020 |
| JC Pallets Ltd | Manufacturing | 2024 |
| Jconner Ltd | Health & social care | 2023 |
| JCW Car Sales Ltd | Wholesale & retail | 2021 |
| JD Electrical and Renewables Ltd | Construction | 2024 |
| JD Enterprises Online Ltd | Wholesale & retail | 2022 |
| JD Heating and Renewables Limited | Construction | 2017 |
| JD Software Limited | Information & communication | 2025 |
| JDC Electrical & Renewables Limited | Construction | 2018 |
| JDC Solar Ltd | Construction | 2025 |
| JDF Electrical Services & Renewables Ltd | Construction | 2024 |
| JDR Property and Rentals Ltd | Real estate | 2022 |
| JDW Group Limited | Real estate | 2021 |
| JDW Group Properties Limited | Real estate | 2026 |
| Jemma Bowers Ltd | Manufacturing | 2022 |
| Jenks Lettings Limited | Real estate | 2018 |
| Jenks Property Limited | Construction | 2012 |
| Jesanua Project Management Ltd | Information & communication | 2023 |
| Jhoveth Lee-Overy Aesthetic Clinic & Training Academy Limited | Wholesale & retail | 2012 |
| Jiya & Kanav Retail Ltd | Wholesale & retail | 2024 |
| JJ7 Ltd | Wholesale & retail | 2024 |
| JJC Agriculture Ltd | Agriculture & fishing | 2022 |
| JM & SE Jackson Limited | Agriculture & fishing | 2010 |
| JMD Bookkeeping & Tax Ltd | Professional & scientific | 2019 |
| JMW Autos Ltd | Wholesale & retail | 2025 |
| John Buchan Agronomy Ltd | Agriculture & fishing | 2015 |
| John Clarke Security Consultant Ltd | Administrative & support | 2024 |
| John Leese Groundworks Ltd | Construction | 2024 |
| Johnson & Johnson Developments Ltd | Construction | 2026 |
| Johnston Construction Services Ltd | Construction | 2021 |
| Jonathan Flower Clocks Limited | Manufacturing | 2013 |
| Jones Reinforcements Ltd | Construction | 2006 |
| Jones the Builder Limited | Construction | 2003 |
| Jordan Design Services Limited | Professional & scientific | 2024 |
| Jorh Holdings Limited | Real estate | 2014 |
| Joules Brewery Limited | Manufacturing | 2008 |
| JTQ - Engineering Services Ltd | Professional & scientific | 2023 |
| JVS Machinery Limited | Wholesale & retail | 2018 |
| K & R Traction Ltd | Transport & logistics | 2020 |
| K Clorley Groundworks Limited | Construction | 2023 |
| K&S Pallet Repairs Limited | Construction | 2016 |
| Kata Chiefs Limited | Other services | 2017 |
| KDT Services Ltd | Transport & logistics | 2015 |
| Keen 2 Drive Limited | Transport & logistics | 2016 |
| Keepers Cottage Holdings Ltd | Construction | 2023 |
| Kenstone Barns Management Company Limited | Households | 2013 |
| Keown Consulting Ltd | Professional & scientific | 2025 |
| Key Irrigation Limited | Professional & scientific | 2019 |
| Kimman Investments Ltd | Real estate | 2021 |
| Kingsway Select Limited | Administrative & support | 2012 |
| Kitch Construction & Property Development Ltd | Construction | 2024 |
| KK15 Ltd | Real estate | 2025 |
| KMB Home & Garden Ltd | Administrative & support | 2026 |
| Knighton Farm Property Ltd | Real estate | 2020 |
| Koki Enterprise Limited | Transport & logistics | 2017 |
| Kopphall Ltd | Manufacturing | 2025 |
| Kurbside Motorz Limited | Wholesale & retail | 2017 |
| L & G Wilcox Utilities Limited | Construction | 2016 |
| L & M Rentals Ltd | Real estate | 2019 |
| L G Farms Limited | Agriculture & fishing | 2016 |
| L Gilbert Holdings Ltd | Professional & scientific | 2014 |
| L Roberts Holdings Ltd | Construction | 2023 |
| LA Events & Photography Ltd | Professional & scientific | 2023 |
| LAH Ltd | Arts & recreation | 2025 |
| Lalakato Enterprise Limited | Construction | 2015 |
| Lascells Limited | Manufacturing | 1997 |
| Lauraray Ltd | Information & communication | 2025 |
| Lawnorder Limited | Administrative & support | 2003 |
| Lawrence Properties (Staffordshire) Limited | Real estate | 2024 |
| LB Medics Ltd | Health & social care | 2025 |
| Lean FSL Associates Ltd | Professional & scientific | 2012 |
| Leandro Holdings Ltd | Real estate | 2025 |
| Leat Solutions Ltd | Manufacturing | 2009 |
| LEE Jakeman Recovery & Transport Ltd | Wholesale & retail | 2021 |
| Lejmax Ltd | Real estate | 2019 |
| Leva & Mabi Limited | Arts & recreation | 2014 |
| Leyfos Holdings Limited | Real estate | 2013 |
| LG1 Limited | Real estate | 2021 |
| Life of Riley Bakery Ltd | Manufacturing | 2021 |
| Like Nanna Made Ltd | Hospitality | 2020 |
| Lilley Advisory Limited | Professional & scientific | 2024 |
| Lindon Environmental Air Services Limited | Manufacturing | 1982 |
| Lindop Industries Ltd | Construction | 2022 |
| Listening Horse CIC | Health & social care | 2024 |
| Live in the House Ltd | Arts & recreation | 2011 |
| Livia Consultants Limited | Professional & scientific | 2014 |
| Lockley Storage Limited | Other services | 2021 |
| Longacres Residents Association Limited | Households | 1983 |
| Longpools Limited | Financial services | 2025 |
| Lord & Co. Holdings Limited | Real estate | 2026 |
| Lower Farm Solar Ltd | Construction | 2026 |
| Loxs Holdings Ltd | Financial services | 2025 |
| LP Management Limited | Professional & scientific | 2022 |
| LRB Services Ltd | Professional & scientific | 2023 |
| LSX Performance Ltd | Manufacturing | 2020 |