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Basic Materials > Oil Gas Drilling Exploration > Penn West Petroleum Ltd. (PWE):

1. Daily short sale volume for Penn West Petroleum Ltd. (PWE)
2. Bi-monthly short interest from NASDAQ

1. Insider Transactions for Penn West Petroleum Ltd. (Penn West Petroleum Ltd.) by Yahoo
2. NASDAQ insider trades for Penn West Petroleum Ltd. (Penn West Petroleum Ltd.)

1. Major Holders of Penn West Petroleum Ltd. listed by Yahoo
2. Penn West Petroleum Ltd. (PWE)owership summary,institutional holdings

1. More from Yahoo finance
   
2. Open @ Reuters
   
3. Open with Google Finance
   
4. Open with Market Watch
   
5. Open with Sina finance (in chinese)