| 3 Shilling Dream Music, Arts & Publishing Ltd | Information & communication | 2024 |
| A & M Dobbin Limited | Wholesale & retail | 2003 |
| Agtss Ltd | Professional & scientific | 2019 |
| Atlw Painting & Decorating LLP | | 2025 |
| Balanced Isle Limited | Information & communication | 2025 |
| Balmpots Limited | Manufacturing | 2016 |
| Cumbrae Community Development Company | Administrative & support | 2002 |
| Cumbrae Contracts Ltd | Transport & logistics | 2019 |
| Cumbrae Couriers Limited | Transport & logistics | 2005 |
| Cumbrae Kitchen Limited | Hospitality | 2015 |
| Cumbrae Yacht Slip Ltd | Transport & logistics | 2012 |
| Deep Sea Fish & Chicken Bar Ltd | Hospitality | 2026 |
| Derek Hagan Joinery Services Limited | Construction | 2006 |
| DUN Creag Developments Limited | Construction | 2023 |
| Fraser's Bar Limited | Hospitality | 2003 |
| G & K Lundie Ltd | Hospitality | 2019 |
| Garrison House (Cumbrae) Ltd. | Administrative & support | 2003 |
| Garrison House Cafe Ltd | Hospitality | 2015 |
| Global Energy Finance Limited | Professional & scientific | 2009 |
| Golden Dragon XUE Ltd | Hospitality | 2022 |
| Gordon Lundie Electrical Ltd | Construction | 2026 |
| Indigoflow Limited | Education | 2024 |
| Isle of Cumbrae Brewing Company Ltd | Manufacturing | 2021 |
| Isle of Cumbrae Initiative Community Company | Other services | 2008 |
| Jacks Alt-Stays Limited | Hospitality | 2021 |
| Jacks Alt-Stays Millport Limited | Hospitality | 2021 |
| Kenny's Kitchen Limited | Hospitality | 2018 |
| Maclachlan's Family Butchers Ltd | Other services | 2017 |
| Macs(Millport) Ltd | Real estate | 2017 |
| Magical Isle Limited | Agriculture & fishing | 2024 |
| Mcarthur & SON Ltd | Construction | 2015 |
| Metta Wellbeing CIC | Wholesale & retail | 2020 |
| Millport Creative Hub Ltd | Wholesale & retail | 2025 |
| Millport Holiday Apartments Limited | Real estate | 2012 |
| Millport Marina Ltd | Arts & recreation | 2024 |
| Millport Motors Limited | Transport & logistics | 1950 |
| Millport Outdoor Outfitters Ltd | Wholesale & retail | 2024 |
| Millport Storage Solutions Ltd | Transport & logistics | 2020 |
| Newton Property Limited | Construction | 2004 |
| ON Your Bike Millport Ltd | Administrative & support | 2021 |
| Pebbles Cafe Ltd | Hospitality | 2025 |
| Planet Heat Ltd | Manufacturing | 2016 |
| Planet Renewables Ltd | Manufacturing | 2011 |
| Sparyn Ltd | Wholesale & retail | 2025 |
| ST. Maura Property Company Ltd | Real estate | 2012 |
| Swingbuild Systems Ltd | Arts & recreation | 2025 |
| Taberner Property Ltd | Real estate | 2025 |
| THE Cumbrae Butcher Ltd | Wholesale & retail | 2025 |
| THE Old Church Millport Ltd | Hospitality | 2024 |
| Tower Ridge Publishing Limited | Information & communication | 2024 |
| Town Hall Cumbrae Ltd | Real estate | 2019 |