| Abbreviation | Definition |
|---|---|
| WPT | Westport Innovations, Inc. |
| WPZ | WorldPages.com |
| WQP | West Pennsylvania Power Company |
| WR | Westar Energy, Inc. (formerly Western Resources, Inc.) |
| WRE | Washington Real Estate Investment Trust |
| WRI | Weingarten Realty Investors |
| WRIPA | Weingarten Realty Investments Preferred A |
| WRIPC | Weingarten Realty Investments Preferred C |
| WRPB | Western Reserve Capital II |
| WS | Weirton Steel Corporation |
| WSM | Williams Sonoma, Inc. |
| WSO | Watsco, Inc. |
| WSP | West Penn Power Company (former symbol - now delisted) |
| WSS | Washingtron Steel Corporation (de-listed) |
| WST | West Pharmaceutical Services, Inc. |
| WTM | White Mountain Insurance Group, LTD., of Bermuda |
| WTS | Watts Industries, Inc. |
| WTU | Williams Coal Seam Gas Royalty Trust |
| WTW | Weight Watchers International, Inc. |
| WTX | Worldtex Corporation |