| Howlings Hodgson Limited | Real estate | 2009 |
| Humber Growers Limited | Wholesale & retail | 1968 |
| Huxt Holdings Ltd | Financial services | 2015 |
| I & S Perfect Smile Limited | Health & social care | 2014 |
| I P Holloway Limited | Health & social care | 2013 |
| Idigital Consulting Limited | Professional & scientific | 2018 |
| Inclusive Learning (North West) Limited | Professional & scientific | 2013 |
| Infra-Be Group Limited | Administrative & support | 2017 |
| Infrastructure Estate Solutions Ltd | Professional & scientific | 2017 |
| Inspire Credit Management Limited | Financial services | 2012 |
| Integral Scaffolding Limited | Construction | 2003 |
| Inter-County Communications Limited | Information & communication | 2002 |
| IPW54 Limited | Professional & scientific | 2014 |
| JAB Supplies Limited | Wholesale & retail | 2018 |
| Jamie Rosa Ltd | Manufacturing | 2020 |
| Jars and Preforms Europe Ltd | Administrative & support | 2015 |
| Jcdc Consulting Ltd | Professional & scientific | 2014 |
| Jigsaw Drinks Limited | Other services | 2015 |
| JKF Alliance Ltd | Health & social care | 2015 |
| JMA Global Logistics Limited | Administrative & support | 2025 |
| JME Consulting Limited | Professional & scientific | 2022 |
| Jmolloy Fire Engineering Ltd | Professional & scientific | 2018 |
| Joao Sousa Magalhaes Ltd | Health & social care | 2014 |
| Johnsons 1871 Holdings Limited | Professional & scientific | 2003 |
| Johnsons Installation Services Ltd | Construction | 2024 |
| Johnsonssports.Com Ltd | Wholesale & retail | 2018 |
| Jpeg World Limited | Professional & scientific | 2020 |
| JPR Real Estate Ltd | Real estate | 2019 |
| Jrme (UK) Limited | Hospitality | 2010 |
| Juna Products Limited | Manufacturing | 1989 |
| K & S European Services Limited | Manufacturing | 1999 |
| K E Electrical Services Limited | Construction | 2020 |
| KAI Legal Consultancy Ltd | Administrative & support | 2018 |
| Karen Ritchie Estates Ltd | Real estate | 2011 |
| Khever Ltd | Wholesale & retail | 2020 |
| Kids Versus Ltd | Health & social care | 2019 |
| Kiffin Hawley Limited | Hospitality | 2019 |
| Kinder Developments Ltd | Construction | 2015 |
| Kingfisher Design and Management Ltd | Professional & scientific | 2003 |
| Kingston Investments NW Limited | Real estate | 2012 |
| Kirkby Hydroponics Ltd | Other services | 2010 |
| KMU Limited | Wholesale & retail | 2018 |
| Koia Global Limited | Information & communication | 2021 |
| Kooboo Ltd | Professional & scientific | 2010 |
| Krantech Group Limited | Manufacturing | 2015 |
| L & J.M. Property Limited | Other services | 2003 |
| L & M Allen Limited | Information & communication | 2002 |
| L.C.R. Holding Limited | Real estate | 2019 |
| L.R.Stacey & Co. Limited | Real estate | 1963 |
| LA Development Associates Limited | Professional & scientific | 2014 |
| LA Marina Limited | Real estate | 2017 |
| LAB Rotherham Holdings Limited | Financial services | 2024 |
| Laserhq Limited | Other services | 2017 |
| Lexicon Law Limited | Professional & scientific | 2010 |
| Lilac Lane Limited | Other services | 2013 |
| Linda Harper Consulting Ltd | Professional & scientific | 2015 |
| Little Miss Electrical Ltd | Construction | 2019 |
| Llandudno Junction Car Centre Limited | Wholesale & retail | 2005 |
| London Respiratory Consultants Limited | Health & social care | 2009 |
| Long Eaton Furniture Company Limited | Real estate | 2012 |
| Lorap Limited | Wholesale & retail | 2007 |
| Lovely Food Limited | Hospitality | 2012 |
| Lsem Solutions Limited | Professional & scientific | 2017 |
| Lupo Caffe' Italiano Ltd | Hospitality | 2015 |
| Luskentyre Limited | Professional & scientific | 2009 |
| M G Trading Castlefield Limited | Wholesale & retail | 1996 |
| M.A.P Builders & Joiners Limited | Construction | 2008 |
| M.A.S Contracts Limited | Agriculture & fishing | 2002 |
| Macallister Medical Services Limited | Health & social care | 2022 |
| MAG 22 Ltd | Real estate | 2020 |
| Malcolm Clarke (Steel) Hollinwood Limited | Wholesale & retail | 1970 |
| Malvern Properties Limited | Construction | 2014 |
| Malvern Radio Limited | Hospitality | 2015 |
| Manecore Ltd | Transport & logistics | 2018 |
| Mannat Fashion Limited | Wholesale & retail | 2015 |
| Mark Sheeran Consulting Limited | Professional & scientific | 2018 |
| Market Echoes Limited | Professional & scientific | 1998 |
| Marmalade Advisory Services Ltd | Professional & scientific | 2015 |
| Matchbrook LLP | | 2002 |
| Mauchline Financial Management Limited | Professional & scientific | 2006 |
| Mclennan's Limited | Construction | 2015 |
| MD Sunbeam Limited | Wholesale & retail | 2013 |
| Medic Creations Limited | Information & communication | 2015 |
| Medysense Limited | Wholesale & retail | 2020 |
| Melfrancesco Limited | Health & social care | 2003 |
| Mercer,Jones and Company Limited | Financial services | 1934 |
| MFS Gear Co. Ltd | Financial services | 2024 |
| Mfst Limited | Wholesale & retail | 2010 |
| MFW Holdings Limited | Financial services | 2016 |
| MGW Haulage Limited | Transport & logistics | 2019 |
| Milk Leisure Limited | Construction | 2009 |
| Modus Agency Ltd | Manufacturing | 2007 |
| Motorterm Limited | Wholesale & retail | 1993 |
| Mpss Inspection Ltd | Professional & scientific | 2010 |
| Musa Hair Studio Ltd | Other services | 2019 |
| MVM Coaches Limited | Administrative & support | 2013 |
| N.S Gilbert Developments Ltd | Construction | 2015 |
| Nails for U (Bury) Limited | Other services | 2018 |
| Netcoms.Co.Uk Limited | Information & communication | 1999 |
| Neurolegal Services Limited | Health & social care | 2009 |