| Kosmotherm Engineering Limited | Construction | 2023 |
| Kpro Limited | Professional & scientific | 1999 |
| Kress Owlpen Ltd | Extraterritorial | 2025 |
| Krupted UK Ltd | Hospitality | 2024 |
| Kurdish Barber Dursley Limited | Other services | 2024 |
| L & S Construction Cleaning Limited | Administrative & support | 2019 |
| Lakeshield Leisure Limited | Hospitality | 1992 |
| Lane’S Enterprises Ltd | Real estate | 2023 |
| Lankirk Developments Ltd | Construction | 2024 |
| Larchbrook LPS LLP | | 2022 |
| Lawgrove Energy Limited | Construction | 2025 |
| Leadership Coaching International Ltd | Administrative & support | 2024 |
| Leaf and Ground Ltd | Other services | 2019 |
| Leaflet Delivery Services Ltd | Information & communication | 2021 |
| Lefe Limited | Wholesale & retail | 2024 |
| Lemontree Studios Ltd | Information & communication | 2021 |
| Let's Face IT Facepainting Ltd | Arts & recreation | 2026 |
| Lighthouse Food Consultancy Limited | Hospitality | 2017 |
| Linela Embroidery Limited | Manufacturing | 2003 |
| Lite Green Living Limited | Real estate | 2022 |
| Little Avon Kitchen Ltd | Hospitality | 2025 |
| London Clay Landscapes Ltd | Professional & scientific | 2024 |
| London Clay Ltd | Professional & scientific | 2025 |
| London Clay Studio Ltd | Professional & scientific | 2025 |
| Long Street Takeaway Limited | Hospitality | 2023 |
| Lower Poole Close Limited | Administrative & support | 2011 |
| Lower Poole Education Limited | Education | 2021 |
| Lower Poole Property Limited | Real estate | 2017 |
| Lucy Thomas Chiro Limited | Health & social care | 2019 |
| Lumiere Home Interiors Ltd | Wholesale & retail | 2022 |
| M & N Motor Services Ltd | Wholesale & retail | 2004 |
| M. Temple Plumbing & Heating Limited | Construction | 2002 |
| Ma'Al Hayat Limited | Professional & scientific | 2025 |
| Mace Hair Studio Limited | Other services | 2023 |
| Mackenzie Projects Ltd | Construction | 2026 |
| Macsa Limited | Real estate | 2025 |
| Mahadev Enterprise Ltd | Wholesale & retail | 2024 |
| Malthouse Property Management Ltd | Real estate | 2025 |
| Manor Contracting Limited | Construction | 2002 |
| Maple and Morii Ltd | Information & communication | 2023 |
| Mappa Candles Limited | Manufacturing | 2024 |
| Marc Austin Ltd | Professional & scientific | 2003 |
| Masis Delivery Services Ltd | Transport & logistics | 2023 |
| Matal Consulting Limited | Professional & scientific | 2018 |
| Maven Knight Ltd | Professional & scientific | 2018 |
| MAY GAO Limited | Hospitality | 2013 |
| MAY Lane (Dursley) Management Limited | Households | 1986 |
| Mcallister Masonry Limited | Construction | 2002 |
| MCP Education Consulting Ltd | Education | 2024 |
| MD Fencing and Landscapes Limited | Administrative & support | 2020 |
| MDP Electrical Ltd | Construction | 2007 |
| Meadowcroft Property Maintenance Limited | Construction | 2000 |
| Media by Manta Ltd | Information & communication | 2025 |
| Metamorphic Health Ltd | Health & social care | 2023 |
| Metform Ltd | Manufacturing | 2013 |
| Mewse Ltd | Real estate | 2022 |
| MG Multimedia Ltd | Professional & scientific | 2020 |
| Mhowson Limited | Professional & scientific | 2025 |
| Micro-Models Ltd | Manufacturing | 2013 |
| MINDSET4SUCCESS Ltd | Professional & scientific | 2003 |
| Miscarriage Mumma Support CIC | Other services | 2022 |
| Miyawaki Watch Co. Ltd | Wholesale & retail | 2023 |
| MJ Vending Ltd | Wholesale & retail | 2025 |
| Mobileit@Pps.Com Limited | Information & communication | 1994 |
| Mode Business Training Limited | Professional & scientific | 2023 |
| Molly Adele Limited | Professional & scientific | 2011 |
| MOO Socks Ltd | Wholesale & retail | 2025 |
| Moretti Limited | Manufacturing | 2002 |
| MP Building Contractors (South West) Ltd | Construction | 2018 |
| Mrkit Ltd | Information & communication | 2018 |
| Muresk Properties Ltd | Real estate | 2022 |
| Mushcado Consulting Limited | Professional & scientific | 2006 |
| N & J LEA Properties LLP | | 2012 |
| Nash Window Cleaning & Services Limited | Administrative & support | 2018 |
| Nature 101 Ltd | Education | 2025 |
| Nbfire Limited | Information & communication | 2022 |
| Nbsh Professional Services Ltd | Professional & scientific | 2023 |
| Neologic Ltd | Manufacturing | 2014 |
| Neptra Scaffolding Ltd | Construction | 2025 |
| Nerva Solutions Ltd | Information & communication | 2021 |
| Netherhills Equestrian Ltd | Agriculture & fishing | 2022 |
| Neurothrive C.I.C. | Education | 2024 |
| New Courtyard Limited | Other services | 2011 |
| Next Level Fitness Ltd | Arts & recreation | 2014 |
| Nibley Knoll | Administrative & support | 2011 |
| Nibley Limited | Financial services | 2019 |
| Nick Sparks Ltd | Professional & scientific | 2011 |
| Nigel Davis Automotive Training Ltd | Education | 2022 |
| Nigel Evans Consulting Ltd | Professional & scientific | 2013 |
| Nigel Hudson Ltd | Construction | 2010 |
| Nightingale Court Limited | Professional & scientific | 1989 |
| Nor-Ray-Vac Limited | Extraterritorial | 2022 |
| Nor-Ray-Vac Spares Limited | Extraterritorial | 2022 |
| Norbury Barker Ltd | Professional & scientific | 2026 |
| Norman Rodger Safety Services Limited | Administrative & support | 2016 |
| North Nibley Music Festival Limited | Arts & recreation | 2008 |
| North Nibley Recreation Field | Arts & recreation | 2007 |
| North Road Thornbury Management Limited | Real estate | 2020 |
| Nova-Uk Limited | Wholesale & retail | 2011 |
| Novello Upholstery Limited | Other services | 2024 |