| Taigh Dhonnchaidh Trading Ltd | Administrative & support | 2019 |
| Taxnfacts Ltd | Professional & scientific | 2019 |
| Terminal Ltd | Information & communication | 2020 |
| Terrapod Ltd | Extraterritorial | 2024 |
| Terrasiar Ltd | Agriculture & fishing | 2019 |
| THE Beach Bothies Ltd | Hospitality | 2019 |
| THE Breasclete Community Association | Other services | 2001 |
| THE Chief Cook Limited | Hospitality | 2016 |
| THE Clan Macquarrie Community Centre | Other services | 2002 |
| THE Construction Toolbox Ltd | Information & communication | 2026 |
| THE Draftsman Ltd | Professional & scientific | 2009 |
| THE Erisort Trust | Other services | 2001 |
| THE Island Spirit Whisky Shop Ltd. | Wholesale & retail | 2017 |
| THE Joiners Bench Limited | Construction | 2006 |
| THE Learning ZOO Limited | Education | 2011 |
| THE Lews Distillery Ltd | Manufacturing | 2024 |
| THE Pairc Trust | Real estate | 2003 |
| THE Travel Shop Ltd | Other services | 2024 |
| Thinkbusiness (Bookkeeping) Ltd | Professional & scientific | 2021 |
| Tolsta Hideaways Limited | Real estate | 2022 |
| Tong Recreation Association | Other services | 2003 |
| Tony Robson Consultancy Limited | Professional & scientific | 2018 |
| Topoplace Systems Ltd | Information & communication | 2026 |
| Total Design (Lighthill) Ltd | Professional & scientific | 2010 |
| Travels Through Time Ltd | Administrative & support | 2018 |
| Tursachan Trading Limited | Hospitality | 1995 |
| Tuskar Technology Limited | Professional & scientific | 2004 |
| UCF Supplies Ltd | Wholesale & retail | 2024 |
| UIG Energy Limited | Professional & scientific | 2001 |
| UIG Estate Limited | Hospitality | 2026 |
| UIG Seafare Limited | Agriculture & fishing | 2004 |
| Umbra Drilling Limited | Administrative & support | 2017 |
| United Business Services UK Ltd | Wholesale & retail | 2022 |
| Unruly Strategies Ltd | Professional & scientific | 2026 |
| Uralba Limited | Arts & recreation | 2003 |
| Urras Bharabhais (Trading) Limited | Real estate | 2016 |
| Urras NAN Tursachan | Arts & recreation | 1994 |
| Urras Oighreachd Ghabhsainn | Real estate | 2004 |
| Urras Sgire Oighreachd Bharabhais Community Company | Real estate | 2010 |
| Urras TAC Chalanais | Administrative & support | 2006 |
| Vision Safety Limited | Professional & scientific | 2004 |
| Vistem Safety Services Limited | Professional & scientific | 2025 |
| Vladcat Enterprises Ltd | Professional & scientific | 2008 |
| Volthalt Ltd | Professional & scientific | 2025 |
| W J Macdonald (Butchers) Limited | Wholesale & retail | 2005 |
| Wardance Ltd | Extraterritorial | 2021 |
| WEE Studio Records Limited | Information & communication | 2023 |
| West Coast Community Energy Limited | Energy | 2024 |
| West Coast Fishing Limited | Professional & scientific | 2018 |
| Western Isles Association for Mental Health | Professional & scientific | 2003 |
| Western Isles Community Radio | Information & communication | 1993 |
| Western Isles Marine Services Ltd | Agriculture & fishing | 2022 |
| Western Isles Polycarbonate Tunnels Ltd | Construction | 2021 |
| Western Isles Properties Limited | Administrative & support | 2002 |
| Western Isles Stardust Project CIC | Education | 2025 |
| Western Isles Transport Preservation Group | Arts & recreation | 2005 |
| Western Isles Transport Services Limited | Transport & logistics | 2014 |
| Westside Surveys Limited | Professional & scientific | 2012 |
| Weststar Property Management Ltd | Households | 2025 |
| Wifiis Limited | Construction | 1992 |
| Wild Isle Adventures Ltd | Arts & recreation | 2025 |
| Wobbly Dog Ltd | Hospitality | 2019 |
| Woodworm Western Isles Limited | Administrative & support | 2026 |
| Woody's Express Parcels Limited | Transport & logistics | 1992 |
| Xdynamics Ltd | Professional & scientific | 2020 |
| XIP Ltd | Extraterritorial | 2024 |
| XL Foundation Ltd | Extraterritorial | 2020 |
| Xlaboratory Ltd | Professional & scientific | 2018 |
| Xsqrd Ltd | Real estate | 2020 |
| Xteam Ltd | Administrative & support | 2020 |