| Howe Estates Company Limited | Agriculture & fishing | 1948 |
| Howsons Properties Ltd | Financial services | 2026 |
| Howsons Trading Ltd | Financial services | 2026 |
| Huseyin Kara Ltd | Other services | 2016 |
| Hutton Mill Limited | Wholesale & retail | 1970 |
| Hydroblast Limited | Construction | 2003 |
| I & G Gibson Limited | Agriculture & fishing | 2002 |
| I.E. Lawrence Joinery Limited | Construction | 2006 |
| IAN Nicol Partnership Limited | Education | 2005 |
| IAN Rodgers Limited | Other services | 2002 |
| IAN Walker & Sons Limited | Construction | 2002 |
| ICM Creative Communications Limited | Professional & scientific | 2001 |
| Ilkley Plastering Limited | Construction | 2007 |
| Independent Shellfishermen's Cooperative (Bridlington) Limited | Wholesale & retail | 2006 |
| Industrial and General Cleaners (Leeds) Limited | | 1980 |
| Infotone Imaging Supplies Limited | Manufacturing | 2000 |
| Ingham & Co. Services Limited | Administrative & support | 1997 |
| Inghams of Filey Limited | Hospitality | 2006 |
| Innovative Healthcare Limited | Professional & scientific | 2003 |
| Instcom Limited | Professional & scientific | 2008 |
| Insurebefore Limited | Households | 1996 |
| Integrity Business Solutions Limited | Information & communication | 1999 |
| International Union for Physical and Engineering Sciences in Medicine Limited | Other services | 2022 |
| Interscribe Ltd | Information & communication | 1997 |
| Ipcress Consultancy Limited | Professional & scientific | 2004 |
| Ipcrest Properties Limited | Real estate | 2001 |
| Irrigatia Limited | Manufacturing | 2005 |
| Iskem Limited | Real estate | 2003 |
| IT Accessed Limited | Information & communication | 2004 |
| Ivan Ross Plumbing & Heating Limited | Construction | 2003 |
| J C Watson and SON Limited | Agriculture & fishing | 2002 |
| J D Roach (Builders) Limited | Construction | 2001 |
| J E Audsley Ltd | Manufacturing | 2003 |
| J Robinson & SON Ltd | Construction | 2004 |
| J Simpson Self Storage Limited | Other services | 2015 |
| J W Smith & Co Ltd | Professional & scientific | 2002 |
| J. Handley Limited | Agriculture & fishing | 1996 |
| J. M. Dale Limited | Construction | 2002 |
| J.W. Mortimer Limited | Manufacturing | 2003 |
| Jackson Trombetta Limited | Professional & scientific | 2026 |
| JAF Farming Limited | Agriculture & fishing | 1998 |
| JAG Print Management Limited | Manufacturing | 2006 |
| Janie Wilson Limited | Manufacturing | 2007 |
| Jasmine Park Limited | Extraterritorial | 2006 |
| JC Gildroy Ltd | Construction | 2002 |
| Jennings Farmers Limited | Agriculture & fishing | 2006 |
| Jimp Associates Limited | Extraterritorial | 2007 |
| JMJ Petroleum Limited | Professional & scientific | 2007 |
| Joblint Limited | Financial services | 1987 |
| John Roberts Holdings Limited | Manufacturing | 1996 |
| Johnsons Furniture Limited | Wholesale & retail | 1995 |
| Jolly Cobblers (Bristol) | Real estate | 1977 |
| Jolly Good Workshops for Schools Limited | Arts & recreation | 2003 |
| Joseph Ogden Limited | Financial services | 2004 |
| JP Power Systems Ltd | Manufacturing | 2004 |
| JR and SB Dining Ltd | Hospitality | 2025 |
| JS Calvert Limited | Construction | 2003 |
| Jupiter Engineering Ltd | Professional & scientific | 2023 |
| Jupp Associates Limited | Professional & scientific | 2001 |
| Just Jeans Limited | Wholesale & retail | 2002 |
| JVC Retail Limited | Wholesale & retail | 1997 |
| K L Bradley Limited | Wholesale & retail | 2015 |
| K.T. Horticulture Limited | Construction | 1999 |
| Kalsoom Traders Ltd Ltd | Wholesale & retail | 2026 |
| KAM Pack for Shopping Centers Ltd | Wholesale & retail | 2026 |
| Kane Projects Limited | Professional & scientific | 2007 |
| KAS Design Ltd | Arts & recreation | 2006 |
| Keith Locker Ltd | Construction | 2002 |
| Keith Richardson ( Agricultural Engineer) Limited | Manufacturing | 2002 |
| Keith Taylor Limited | Financial services | 2000 |
| Kemview Limited | Professional & scientific | 1986 |
| Keydata Solutions Limited | Information & communication | 1994 |
| Kildale Estate Limited | Real estate | 2002 |
| Kilnsey Private Water Supply Limited | Water & waste | 2006 |
| Kingfisher Medical Limited | Wholesale & retail | 2005 |
| Knipe Point Freeholders Limited | Households | 2002 |
| Knipe Point Owners Association Limited | Households | 1984 |
| Knox Property Services Limited | Real estate | 2002 |
| Kronos Learning Limited | Professional & scientific | 1998 |
| Krowne Communications (UK) Limited | Information & communication | 2006 |
| Kwik-Hit Limited | Manufacturing | 2024 |
| LA ROC Building Solutions Limited | Manufacturing | 2007 |
| Ladybird Daycare Limited | Health & social care | 2006 |
| Lambert & Dyson Limited | Manufacturing | 1995 |
| Langley Flats Management Company Limited | Households | 2005 |
| Langtons (Northallerton) Limited | Manufacturing | 1961 |
| Laudage Limited | Professional & scientific | 2007 |
| Laverack Builders Limited | Construction | 2004 |
| Lawrence for Modern Industries Ltd | Wholesale & retail | 2026 |
| Lawson Hobbs Limited | Construction | 1987 |
| LE LAY (Harrogate) Management Limited | Households | 1999 |
| LEN Porter Fencing Limited | Manufacturing | 2016 |
| LES Bignons Limited | Real estate | 1999 |
| LES Clarkson & SON Limited | Transport & logistics | 2004 |
| Life Source Supplements Limited | Wholesale & retail | 1971 |
| Live Wires Club Limited | Education | 2005 |
| Liverpool Investments Ltd | Construction | 1998 |
| Lmljy Ltd | Wholesale & retail | 2026 |
| London Country BUS (North East) Limited | Professional & scientific | 1986 |
| Lord Corrigan Promotions Limited | Arts & recreation | 1970 |