| Winfield Media Limited | Other services | 2010 |
| Wingman FP Limited | Information & communication | 2008 |
| Winter Wind Services Ltd | Professional & scientific | 2024 |
| Wise Home Building LLP | | 2006 |
| Wood BE Beautiful Ltd | Manufacturing | 2021 |
| Woodford Gardening Services Ltd | Administrative & support | 2025 |
| Woodside Wellderness Project CIC | Health & social care | 2024 |
| Woohoo Media Group Limited | Information & communication | 2015 |
| Wootton Against Gravel Extraction Ltd | Information & communication | 2021 |
| Wootton Chiropractic Clinic Limited | Health & social care | 2026 |
| Wootton Estates Ltd | Real estate | 2007 |
| Wootton Islandwide Lettings Ltd | Real estate | 2019 |
| Wootton Premier Ltd | Wholesale & retail | 2026 |
| Wootton Tyres Ltd | Wholesale & retail | 2005 |
| Worldwide Reservations 2015 Ltd | Administrative & support | 2015 |
| WPS Plant Hire Limited | Administrative & support | 2021 |
| WRM (IW) Ltd | Professional & scientific | 2022 |
| WRS Agronomy Limited | Agriculture & fishing | 2012 |
| Wyndham House Management Company Limited | Households | 2015 |
| Xcel Performance Coaching Limited | Education | 2022 |
| Xcel Power Systems Ltd. | Manufacturing | 1956 |
| Yacht-Tek Limited | Wholesale & retail | 2010 |
| YE Old Village Inne Bembridgeo Limited | Hospitality | 2018 |
| YES SVS Ltd | Other services | 2020 |
| YOU TOO Online Ltd | Information & communication | 2014 |
| Youngsteve Ltd | Professional & scientific | 2016 |
| Yummy Mummy Makes Limited | Professional & scientific | 2008 |
| ZEN Cafe IOW Ltd | Hospitality | 2024 |
| ZMB Cafe Ltd | Hospitality | 2021 |
| Zoe's Hair Studio IW Ltd | Other services | 2025 |
| Zulu:One K9 Services Limited | Administrative & support | 2026 |