| W Allerton (Maintenance) Limited | Construction | 2005 |
| W.Thompson (Precision Engineering) Limited | Manufacturing | 1982 |
| W.Wright Electrical Limited | Construction | 1989 |
| Walker & Kitching Limited | Wholesale & retail | 1980 |
| Walker Boot Limited | Wholesale & retail | 1999 |
| Warm Corner Ltd | Wholesale & retail | 2004 |
| Warrens GBC Limited | Professional & scientific | 2007 |
| Warsop Motor Company Limited | Wholesale & retail | 1989 |
| Waterhead Limited | Wholesale & retail | 1995 |
| Wbls Properties Limited | Real estate | 2018 |
| WC Consulting Limited | Real estate | 2003 |
| WE Buy Good Cars Ltd | Wholesale & retail | 2001 |
| Wellmind (Sheffield) Ltd | Health & social care | 2006 |
| Westbourne Flats Management Company Limited | Hospitality | 1992 |
| Westgate Training Limited | | 1989 |
| Westside Construction (Sheffield) Ltd | Construction | 2005 |
| Whitakers N. and M. Limited | Construction | 2002 |
| White Transcription Services Limited | Administrative & support | 2007 |
| Wide Range (Distribution and Retail) Limited | | 1998 |
| Wigs & Hair Extensions Limited | Other services | 2018 |
| Wildsmiths Limited | Wholesale & retail | 2004 |
| Windle Cook Architects Limited | Professional & scientific | 1997 |
| Windowtech Services Limited | Construction | 2002 |
| Wittonfair Limited | Wholesale & retail | 1985 |
| Woodbury Lodges Limited | Manufacturing | 1991 |
| Woodwind Works Limited | Arts & recreation | 2003 |
| Wordsworth Travel Limited | Administrative & support | 1971 |
| Wrightson Engineering Services Limited | Manufacturing | 1998 |
| WYE Electronics Limited | | 1965 |
| XP School (Services) Limited | Administrative & support | 2016 |
| Yorkshire Repak Limited | Manufacturing | 1985 |
| Zedtec Limited | Professional & scientific | 2003 |