| IAC Financial Planning Ltd | Financial services | 2017 |
| Ibex Outdoor Limited | Arts & recreation | 2010 |
| Iconic Eyewear Tavistock Limited | Wholesale & retail | 2021 |
| Identity Studio Ltd | Professional & scientific | 2009 |
| Integra IT Solutions Limited | Information & communication | 2006 |
| Integral Engineering SW Ltd | Manufacturing | 2024 |
| Integrity Accounting and Forensic Solutions Limited | Professional & scientific | 2013 |
| Invictus Tattoo Ltd | Other services | 2017 |
| Istanbul Barber New Ltd | Other services | 2023 |
| Isthmus Limited | Professional & scientific | 1990 |
| J & S Stonework Limited | Construction | 2011 |
| J Sanders and SON Ltd | Wholesale & retail | 2021 |
| J T Greaves Limited | Construction | 2002 |
| J. N. Colton & Sons Limited | Agriculture & fishing | 2003 |
| Jack Cham's Ltd | Hospitality | 2012 |
| Jacobjames Recruitment Limited | Administrative & support | 2014 |
| Jacobs Driving Ltd | Transport & logistics | 2024 |
| JB Glimmer Retail Limited | Wholesale & retail | 2026 |
| JB Inspections Ltd | Manufacturing | 2007 |
| JB Roofing Services Ltd | Construction | 2004 |
| Jessop Enterprise Ltd | Wholesale & retail | 2026 |
| Jethro Enterprises Limited | Agriculture & fishing | 1989 |
| Jogen Limited | Real estate | 1997 |
| Jones & Wing Holdings Limited | Financial services | 2025 |
| JRW Services Limited | Professional & scientific | 2016 |
| K & B Construction Devon Ltd | Construction | 2025 |
| K and M Car Sales Ltd | Wholesale & retail | 2017 |
| K9 Wagons Ltd | Wholesale & retail | 2023 |
| Kapalai Ltd | Administrative & support | 2024 |
| Kingdon House Community Association | Hospitality | 2013 |
| Kingsland FOX Ltd | Construction | 2022 |
| Kinship Connect Ltd | Health & social care | 2017 |
| Kiplonti Ltd | Manufacturing | 2021 |
| Kirby Estate Agents Limited | Real estate | 2012 |
| KJM Bricklaying Ltd | Construction | 2016 |
| Knights Emporium Ltd | Wholesale & retail | 2020 |
| KSK 2 Limited | Hospitality | 2026 |
| L C Investment Properties Limited | Real estate | 2022 |
| Lagom Communication Ltd. | Professional & scientific | 2016 |
| Lawrence Financial Consultancy Limited | Professional & scientific | 2010 |
| Leaf and Stone Store Ltd | Manufacturing | 2024 |
| LED by Dreams CIC | Education | 2015 |
| Leef Catering Ltd | Hospitality | 2024 |
| Leisure Catering Ltd | Hospitality | 2024 |
| Link Care and Support Limited | Health & social care | 2024 |
| Links Publishing Ltd | Information & communication | 2014 |
| Lionstead Ltd | Professional & scientific | 2020 |
| Little Parks Ltd | Administrative & support | 2012 |
| Littlejohns Fireside Ltd | Wholesale & retail | 2017 |
| LJA Hospitality Ltd | Hospitality | 2025 |
| Longview Animal Services Ltd | Professional & scientific | 2022 |
| Lost in Bristol Limited | Construction | 2016 |
| Lovells 4X4 Ltd | Wholesale & retail | 2026 |
| Luscious Books Ltd | Information & communication | 2012 |
| Lyndsey Hookway Limited | Information & communication | 2021 |
| Lynn's American Diner Ltd | Hospitality | 2025 |
| M&C Beech Ltd | Hospitality | 2020 |
| M&H Laser Limited | Manufacturing | 2006 |
| M&M Fraser Limited | Financial services | 2024 |
| M.Kopciuch Ltd | Health & social care | 2014 |
| M.Rocker Associates Limited | Information & communication | 1991 |
| Maia Research Ltd | Professional & scientific | 2020 |
| Malcolm Gillett Ltd | Professional & scientific | 2021 |
| Malthouse Bar Ltd | Hospitality | 2024 |
| Mansbridge Balment ( New Homes ) Limited | Real estate | 2015 |
| Mansbridge Balment (Franchise) Limited | Real estate | 2014 |
| Mansbridge Balment (Group) Limited | Real estate | 2014 |
| Mansbridge Balment (Lettings) Limited | Real estate | 2014 |
| Mansbridge Balment (Okehampton) Ltd | Real estate | 2008 |
| Mansbridge Balment Limited | Real estate | 2000 |
| Mapt Consultancy Limited | Professional & scientific | 2015 |
| Marbles Lost and Found CIC | Health & social care | 2019 |
| Mark Darby Projects Ltd | Professional & scientific | 2024 |
| Mark Kelly 4X4 Services Ltd | Wholesale & retail | 2015 |
| Mary Palmer Limited | Professional & scientific | 2007 |
| Mat-Ewes Ltd | Agriculture & fishing | 2024 |
| MDM SW Ltd | Arts & recreation | 2024 |
| Media Motion Rentals Limited | Administrative & support | 2025 |
| Memory Doctor Ltd | Health & social care | 2023 |
| MEN for ALL Seasons Limited | Administrative & support | 2011 |
| Messrs R L Toop LLP | | 2016 |
| Mickeys Plaice Ltd | Hospitality | 2019 |
| Milemead Lakes and Tackle Limited | Wholesale & retail | 2003 |
| Milnerton Logistics Limited | Transport & logistics | 2026 |
| Milton Abbot Centenary Club Ltd | Other services | 2026 |
| Mime Ltd | Hospitality | 2019 |
| Mion Property Limited | Real estate | 2025 |
| Miscanthus Ltd | Professional & scientific | 2023 |
| Miss Saigon Nails Limited | Other services | 2018 |
| MNT Cuisine Ltd | Hospitality | 2025 |
| Molly's Kitchen Limited | Hospitality | 2024 |
| Montgomery Drive Limited | Real estate | 2017 |
| Montpelier Management Services Limited | Professional & scientific | 2018 |
| Moor Homes Ltd | Real estate | 2021 |
| Moor Mindful Ltd | Health & social care | 2020 |
| Moor Overland Ltd | Administrative & support | 2025 |
| Moor Results Marketing Ltd | Professional & scientific | 2024 |
| Moorcare Devon Limited | Health & social care | 2009 |
| Moore & Moore Doors (UK) Ltd | Construction | 2011 |
| Moore & Moore Doors Ltd | Construction | 2009 |