| Abbreviation | Definition |
|---|---|
| WVQ | Monongahela Power Company |
| WWE | World Wrestling Entertainment |
| WWW | Wolverine World Wide, Inc. |
| WWY | William Wrigley, Jr., Company |
| WX | Westinghouse Electric |
| WX | WuXi Pharmatech Cayman, Inc., American Depository Receipts |
| WXH | Winston Hotels, Inc. |
| WXHPA | Winston Hotels, Inc. Preferred A |
| WXHPA | Winston Hotels, Inc. Preferred A (delisted - redeemed) |
| WXS | Westpoint Stevens, Inc. (delisted) |
| WY | Weyerhaeuser Company |
| WYE | Wyeth |
| WYG | Wyman Gordon Company |
| WYN | Wyndham Interational, Inc. (delisted - now WBR on AMEX) |
| WZR | Wiser Oil Company of Delaware |
| X | U. S. Steel Group |
| XAA | American Municipal Income Portfolio, Inc. |
| XAD | Australian Dollar |
| XCH | Northern Power Pines |
| XCT | Equity Securities Trust I |