| 日期 | 代碼 | 券商 | 原評等→升級後評等 | 新目標價 |
| 2011/10/11 | VLO | Barclays Capital | Equal Weight >> Overweight | $31 >> $35 |
| 2011/2/16 | VLO | RBC Capital Mkts | Sector Perform >> Top Pick | $26 >> $35 |
| 2010/10/27 | VLO | Howard Weil | Market Perform >> Market Outperform | $21 >> $22 |
| 2010/6/1 | VLO | Caris & Company | Below Average >> Average | $14 >> $18 |
| 2010/1/4 | VLO | Deutsche Bank | Sell >> Hold | |