| Westlake Demolition Solutions Limited | Construction | 2024 |
| Westley Design Limited | Administrative & support | 2008 |
| Wetwheels South West C.I.C. | Transport & logistics | 2020 |
| Wexalia Ltd | Mining & quarrying | 2021 |
| WFN Electrical, Refrigeration & Air Conditioning Limited | Construction | 2018 |
| WG (Cornwall) Limited | Manufacturing | 2013 |
| WG Cook & Niece Limited | Wholesale & retail | 2011 |
| WGF Management Limited | Households | 2020 |
| Wheal Brake Lodge Management Company Limited | Households | 2005 |
| Wheal Briton Travel Ltd | Transport & logistics | 2014 |
| Wheal Dream Accommodation Limited | Real estate | 2017 |
| Wheal Golden Limited | Real estate | 2026 |
| Wheal Jane Holdings Limited | Financial services | 2023 |
| Wheal Jane Limited | Water & waste | 1999 |
| Wheal Jane Services Limited | Mining & quarrying | 2000 |
| Wheal Jane Trustees Limited | Professional & scientific | 2006 |
| Wheal Kitty Developments Ltd | Manufacturing | 2022 |
| Wheal Kitty Property Management Limited | Households | 2023 |
| Wheal Leisure Management Company Limited | Real estate | 2005 |
| Wheal Tehidy Croft Management Company Limited | Households | 2025 |
| Wheal Turnavore Management Company Limited | Households | 2017 |
| Wheeler Holdings Limited | Financial services | 2016 |
| Wheeler Roofing Limited | Extraterritorial | 2024 |
| Wheeler Roofing Services Limited | Construction | 2012 |
| Wheeler Roofing Supplies Limited | Wholesale & retail | 2024 |
| Where the Wild IS Ltd | Professional & scientific | 2018 |
| Whetter Campbell LLP | | 2024 |
| Whirlwind Management Limited | Professional & scientific | 2007 |
| White Bros Developments Limited | Real estate | 2025 |
| White House Court Cottages Limited | Households | 2012 |
| White Rock Management Company (ST Ives) Limited | Households | 2006 |
| Whitford Motor Bodies Ltd | Wholesale & retail | 2024 |
| Whitwell & Sons Ltd | Information & communication | 2013 |
| Whyfield Limited | Professional & scientific | 2014 |
| Wicksmith Limited | Financial services | 2022 |
| Wighton IT Limited | Information & communication | 2024 |
| Wild Animal Limited | Other services | 2015 |
| Wild Bear Ltd | Hospitality | 2016 |
| Wild Card Public Relations Limited | Professional & scientific | 1999 |
| Wild Cornwall Limited | Wholesale & retail | 2023 |
| Wild Eagle Limited | Other services | 2019 |
| Wild Earth Reverence CIC | Education | 2022 |
| Wild Electricity Limited | Extraterritorial | 2015 |
| Wild Expectations Ltd | Information & communication | 2016 |
| Wild Generation Limited | Extraterritorial | 2015 |
| Wild Inspiration Ltd | Information & communication | 2008 |
| Wild Life Botanicals Ltd | Manufacturing | 2019 |
| Wild West Ltd | Extraterritorial | 2008 |
| Wilde Law LLP | | 2024 |
| Wilderness Photographic Ltd | Professional & scientific | 2018 |
| Wildfire Investments Ltd | Administrative & support | 2015 |
| Wildflower Collective CIC | Agriculture & fishing | 2021 |
| Wilkinson Gardens Management Limited | Real estate | 2009 |
| William Lever Ltd | Information & communication | 2024 |
| William Wood House Management Company Limited | Households | 2015 |
| Williams Creative Homes (Stencoose) Ltd | Construction | 2025 |
| Williams Orthopaedic Solutions Ltd | Health & social care | 2024 |
| Willow Bridge Consultancy Ltd | Administrative & support | 2025 |
| Wills Bingley Limited | Professional & scientific | 2007 |
| Wills Bingley Management Limited | Professional & scientific | 2014 |
| Wills Care Limited | Administrative & support | 2017 |
| Wills Leisure Limited | Hospitality | 2018 |
| Wind & Ropes Limited | Construction | 2025 |
| Windrowe Limited | Energy | 2013 |
| Wing Mirror Store Limited | Wholesale & retail | 2015 |
| Wing of ST Mawes Limited | Manufacturing | 1998 |
| Wing Properties Limited | Real estate | 2021 |
| Wings Construction SW Limited | Construction | 2020 |
| Wintercroft Design Limited | Wholesale & retail | 2015 |
| Winton Estates Ltd. | Real estate | 2022 |
| Wisdom Women's Health Ltd | Health & social care | 2023 |
| Wise Aesthetics Ltd | Extraterritorial | 2024 |
| Wishlist Boutique Limited | Wholesale & retail | 2010 |
| Wiska UK Limited | Wholesale & retail | 2000 |
| Withiel Ltd | Professional & scientific | 2024 |
| Withywell Developments Limited | Real estate | 2020 |
| WJC Stores Limited | Wholesale & retail | 2025 |
| WJT Energy Limited | Professional & scientific | 2025 |
| Woad Ltd | Professional & scientific | 2020 |
| Wolf Samuels Ltd | Information & communication | 2020 |
| Wolvedon Ltd | Information & communication | 2025 |
| Women Making Noise Ltd | Information & communication | 2020 |
| Wonderworks Merchandise Limited | Wholesale & retail | 2025 |
| Woodcock Jones Group Limited | Financial services | 2024 |
| Woodley Marketing Limited | Extraterritorial | 2024 |
| Woodley Ventures Ltd | Financial services | 2024 |
| Work Better Ltd | Professional & scientific | 2021 |
| Workflow Resources Ltd | Information & communication | 2024 |
| Workhouse Records Limited | Information & communication | 2011 |
| Working Edge Ltd | Information & communication | 2007 |
| Working Woodlands Cornwall CIC | Agriculture & fishing | 2017 |
| World Wide Financial Planning Limited | Financial services | 1998 |
| Wormor Holdings Limited | Construction | 1985 |
| Wowooo Limited | Wholesale & retail | 2011 |
| WP & J Jenkin Limited | Agriculture & fishing | 2008 |
| Wreford Famalam Limited | Financial services | 2018 |
| Wren Builders Ltd | Construction | 2024 |
| Wright Construction (IOS) Limited | Construction | 2007 |
| Wright Electrical (IOS) Limited | Construction | 2023 |
| Wright Group Limited | Financial services | 2016 |