| Swim Devon CIC | Arts & recreation | 2024 |
| Swimmingfirst Ltd | Health & social care | 2024 |
| Systempro Ltd | Real estate | 1999 |
| T & Z Hospitality Limited | Hospitality | 2024 |
| TAJ Mahal 007 Limited | Hospitality | 2025 |
| Taxbase Accountancy Services Limited | Extraterritorial | 2015 |
| Taylor ‘Msda’Properties Ltd | Hospitality | 2024 |
| Temple Hill Associates Limited | Extraterritorial | 2014 |
| Tenni F Limited | Wholesale & retail | 2026 |
| THE Alligator PI Agency Limited | Professional & scientific | 2025 |
| THE Concrete Club Limited | Education | 2023 |
| THE Copywriter's Crucible Ltd | Professional & scientific | 2015 |
| THE Financial Services National College Ltd | Education | 2019 |
| THE Ocean Wellness Hub Limited | Health & social care | 2019 |
| THE Old Chapel (Wadebridge) Management Company Ltd | Construction | 2008 |
| THE PS03 Executive Pension Scheme Ltd | Administrative & support | 2023 |
| THE PS03 Executive Pension Scheme Trustees Ltd | Financial services | 2023 |
| THE Rolle Arms Hotel Ltd | Hospitality | 2017 |
| THE Salterton at Budleigh Limited | Hospitality | 2024 |
| THE Sidmouth Design Company Limited | Wholesale & retail | 1998 |
| THE Tipsy Merchant Limited | Wholesale & retail | 2017 |
| Thewinerack Ltd | Wholesale & retail | 2025 |
| Three of a Kind Caterers Limited | Hospitality | 1999 |
| Tibigi Limited | Information & communication | 2026 |
| Tomato Glasses UK Limited | Health & social care | 2014 |
| Tots Specs Ltd | Wholesale & retail | 2011 |
| Trainwright Performance Ltd | Arts & recreation | 2021 |
| Trelivan Properties Limited | Real estate | 2019 |
| TRT Wyboston Limited | Financial services | 2019 |
| Twelvebaskets Limited | Wholesale & retail | 2009 |
| Ultra DRY Adventurer Limited | Wholesale & retail | 2016 |
| VET Harmony Ltd | Professional & scientific | 2012 |
| Vine House Residents Management Company Limited | Households | 1999 |
| Vivaedu Ltd | Information & communication | 2025 |
| Weavers Meadow Ltd | Agriculture & fishing | 2013 |
| Went House (Budleigh Salterton) Limited | Households | 1987 |
| West Down (Management) Limited | Households | 1980 |
| Westcourt Management (Budleigh Salterton) Limited | Administrative & support | 2001 |
| Western Contractors Ltd | Construction | 2022 |
| Westexe Limited | Construction | 2012 |
| Wilson GAS Services Limited | Construction | 2002 |
| Wise Birding Holidays Ltd | Administrative & support | 2011 |
| Wizzard Solutions Ltd | Information & communication | 2001 |
| Wolds Publishing Limited | Information & communication | 2009 |
| Wonder Insight Ltd | Professional & scientific | 2017 |
| Wonder Research Limited | Professional & scientific | 2026 |
| Woods Consulting Limited | Professional & scientific | 1999 |
| Y Media Limited | Professional & scientific | 2015 |
| Yettington Residents Limited | Water & waste | 1997 |