| Millar Callaghan Engineering Services Ltd. | Manufacturing | 1999 |
| Milton Taxis (Ayrshire) Ltd | Transport & logistics | 2019 |
| Mindstead Wellbeing & Resilience C.I.C. | Health & social care | 2025 |
| Mitchell (Ayrshire) Ltd | Other services | 2018 |
| MJB Carpet Fitting Services Limited | Wholesale & retail | 2014 |
| MJB Carpets Limited | Wholesale & retail | 2017 |
| MJL Electrical Services Ltd | Construction | 2023 |
| MM Competitions & Collectibles Ltd | Extraterritorial | 2024 |
| MM Security, Inc. | | 2026 |
| Moicara HR Consultants Limited | Administrative & support | 2025 |
| Molsheim Limited | Hospitality | 2025 |
| Montgomery Inspection Services Ltd | Professional & scientific | 2014 |
| Moon@Co Ltd | Hospitality | 2022 |
| Moonway Traders Limited | Wholesale & retail | 2014 |
| Morrison Home Development Ltd | Construction | 2023 |
| Mostlylucid Limited | Information & communication | 2017 |
| MT Building Services (Ayrshire) Ltd | Construction | 2021 |
| MT Landscaping Services Ltd | Administrative & support | 2022 |
| Mudlark Residential Care Services Ltd | Health & social care | 2026 |
| Muscle Nation Limited | Wholesale & retail | 2021 |
| MVV Transport Limited | Transport & logistics | 2024 |
| MW Rentals UK Limited | Administrative & support | 2015 |
| My Content PAL Ltd | Professional & scientific | 2021 |
| Mygas Heating & Plumbing Services Ltd | Construction | 2024 |
| NAU Nidh 13 Ltd | Wholesale & retail | 2021 |
| NAU Nidh Ltd | Wholesale & retail | 2026 |
| Nbmrholdings Limited | Real estate | 2024 |
| Ndaitech Limited | Information & communication | 2026 |
| Neil Barr Decorating Services Limited | Construction | 2004 |
| Nestwell Property Ltd | Real estate | 2021 |
| New Chapter Creatives Limited | Professional & scientific | 2023 |
| New York School of Forex Trading Ltd | Education | 2025 |
| Nextgen Care Services Ltd | Professional & scientific | 2025 |
| Nikkolee Ltd | Manufacturing | 2025 |
| NO Limits Property Limited | Real estate | 2016 |
| Nobel NC Europe Limited | Wholesale & retail | 2009 |
| Nobel Trading Limited | Wholesale & retail | 2003 |
| Nomb Rail Limited | Construction | 2018 |
| North Ayrshire Leisure Limited | Arts & recreation | 2000 |
| North Ayrshire Ventures Trust | Public administration | 1999 |
| Northcampers Ltd | Manufacturing | 2023 |
| Nova Property Solutions Ltd | Real estate | 2018 |
| NPI (Plant and Machinery) Limited | Administrative & support | 2017 |
| NPI Solutions (Holdings) Limited | Financial services | 2017 |
| NPI Solutions Limited | Manufacturing | 2001 |
| NRC Entertainment Limited | Information & communication | 2020 |
| Nrfj Property Limited | Real estate | 2026 |
| Ntgb Ltd | Professional & scientific | 2024 |
| Obills Ltd | Construction | 2025 |
| Olympus Creations Limited | Wholesale & retail | 2019 |
| Omnitool Limited | Manufacturing | 2005 |
| OMT UK (Holdings) Limited | Financial services | 2021 |
| One for the Team CIC | Administrative & support | 2021 |
| Optimum Eco Group Holdings Limited | Financial services | 2022 |
| Optimum Eco Ltd | Professional & scientific | 2023 |
| Orange Byte Limited | Information & communication | 2025 |
| Oricom Limited | Administrative & support | 2008 |
| Oskar Property Ltd | Real estate | 2020 |
| OUT of Hours Boiler Ltd | Construction | 2023 |
| Overton (Irvine) Limited | Construction | 2012 |
| P W Company (Ayrshire) Ltd | Professional & scientific | 2019 |
| Pacific Summit Energy LLC | | 2025 |
| Paloni Productions Ltd | Professional & scientific | 2019 |
| Paterson Associates Ltd | Professional & scientific | 2014 |
| Paterson Stores Limited | Wholesale & retail | 2018 |
| Paymán Holdings 9 Ltd | Hospitality | 2021 |
| Pbcms Ltd | Professional & scientific | 2018 |
| Peggys Pantry Limited | Hospitality | 2025 |
| Pembrayr Limited | Professional & scientific | 2003 |
| Pembrayr Properties (Irvine) Limited | Hospitality | 2003 |
| Pennyburn Ltd | Wholesale & retail | 2020 |
| Perceton Properties Limited | Construction | 2022 |
| Pgpr Ltd | Professional & scientific | 2022 |
| Picnic Locums Limited | Wholesale & retail | 2022 |
| Plano Pack (U.K.) Limited | Manufacturing | 1999 |
| Platinum Financial Partners Ltd | Financial services | 2017 |
| PLM Estates Limited | Real estate | 2024 |
| Plumbright (Scotland) Ltd. | Construction | 2011 |
| Pops Bar Ltd | Hospitality | 2024 |
| Portland Cars Ltd | Transport & logistics | 2023 |
| PPS Fasfood Ltd | Hospitality | 2023 |
| Premier Installation Electrical Services Limited | Construction | 2003 |
| Prepco Three Holdings Ltd | Manufacturing | 2017 |
| Prestige Lettings LLC Limited | Real estate | 2026 |
| PRG Networks Ltd | Information & communication | 2018 |
| Price Promise Stores Limited | Wholesale & retail | 2016 |
| Prima Performing Arts Ltd | Arts & recreation | 2025 |
| Prime Structural Solutions (Ayrshire) Ltd | Professional & scientific | 2018 |
| Pristine Property Care Ltd | Administrative & support | 2026 |
| Proclean Services Scotland Ltd | Administrative & support | 2018 |
| Project Digital Media Ltd | Professional & scientific | 2022 |
| Project Manufacturing (Scotland) Ltd. | Manufacturing | 2008 |
| Ps-Scaffoldingsolutions Ltd | Construction | 2025 |
| Q Mobiles & Vapes Ltd | Wholesale & retail | 2018 |
| R & a Muir Limited | Professional & scientific | 2013 |
| R F Martin Motor Engineers Ltd. | Wholesale & retail | 2014 |
| R Reid Ltd | Hospitality | 2015 |
| R&M Hair Ltd | Other services | 2016 |
| Race Cleaning Services Ltd | Administrative & support | 2023 |
| Rackit Direct Ltd | Other services | 2020 |