| Mull Property Limited | Real estate | 2022 |
| Mull Renewables Investments Limited | Wholesale & retail | 2011 |
| Mull Wildlife Holidays Ltd | Administrative & support | 2019 |
| Mullaichean Ltd | Real estate | 2025 |
| Nature Scotland Limited | Administrative & support | 2018 |
| Norman Macdonald Limited | Construction | 1999 |
| Nwmcw Trading Company Limited | Agriculture & fishing | 2006 |
| Padley's Tobermory Stores Limited | Wholesale & retail | 2025 |
| Port NAN Gael Holiday Park Limited | Hospitality | 2021 |
| Port NAN Gael Stores Limited | Wholesale & retail | 2023 |
| PR Property Mull Limited | Construction | 2022 |
| R & a Forrester Limited | Agriculture & fishing | 1944 |
| Robert Gray Retail Design Limited | Professional & scientific | 2025 |
| Roslyn House Trading Limited | Hospitality | 2022 |
| Roslyn Operations Limited | Hospitality | 2024 |
| Rutherford Plant Limited | Construction | 2009 |
| Salen Bay Campsite Ltd | Hospitality | 2019 |
| Salmon Restoration Ltd | Professional & scientific | 2025 |
| Scentbeauty Limited | Wholesale & retail | 2024 |
| Scoor Farm Partnership | | 2000 |
| Scots Cottages Limited | Hospitality | 2018 |
| Seaborne Ltd | Real estate | 2026 |
| Sgriob-Ruadh Distillers Ltd | Manufacturing | 2020 |
| Sheepknowe Farm Partnership | | 1991 |
| Skyhook Helicopters Limited | Transport & logistics | 2014 |
| Slomo Pubco Limited | Hospitality | 2024 |
| Solas Properties Limited | Hospitality | 2021 |
| South West Mull and Iona Development | Agriculture & fishing | 2014 |
| Spotless Property Services Limited | Other services | 2017 |
| SRC Car Club Limited | Arts & recreation | 2008 |
| T.S.L. Contractors Ltd. | Construction | 1979 |
| T.S.L. Lochaber Ltd. | Construction | 2014 |
| T.S.L. South Argyll Ltd. | Construction | 2014 |
| Taynuilt Inn Trading Limited | Hospitality | 2019 |
| THE Aarskog Foundation Ltd | Professional & scientific | 2017 |
| THE Antuim Hill Partnership | | 2000 |
| THE Calgary Bay Company Ltd | Wholesale & retail | 2024 |
| THE Fauld Ltd | Agriculture & fishing | 2023 |
| THE Foodie Shack Ltd | Hospitality | 2022 |
| THE French Horn (West END) Limited | Hospitality | 2024 |
| THE Little Bespoke Bakery Ltd | Manufacturing | 2020 |
| THE Rocks Property Holdings Limited | Real estate | 2021 |
| THE Tobermory Fish Company Limited | Manufacturing | 2005 |
| THE Tobermory Whisky DEN Ltd | Wholesale & retail | 2021 |
| Think.In.Form Ltd | Professional & scientific | 2013 |
| Tide Lines Music Limited | Information & communication | 2018 |
| TOB Trade Holdings Limited | Financial services | 2026 |
| Tobermory Caravan Park and Campsite Ltd | Hospitality | 2026 |
| Tobermory Freshwater Ltd | Agriculture & fishing | 2021 |
| Tobermory Gallery Ltd | Wholesale & retail | 2026 |
| Tobermory Harbour Association | Other services | 2003 |
| Tobermory Marine Power Ltd | Agriculture & fishing | 2020 |
| Torr Gorm Developments Limited | Construction | 2002 |
| Tourbook CIC | Information & communication | 2016 |
| TSL Landscaping Limited | Extraterritorial | 2019 |
| Ulva Ferry | | 1992 |
| Ulvalt Farmers | | 1987 |
| West Key Properties Limited | Construction | 2004 |
| Wiksey's Wiring Ltd | Construction | 2015 |
| Wild Campers Limited | Administrative & support | 2016 |
| Wisteria and Heather Ltd | Hospitality | 2024 |