Shares of big oil companies sink even further than the broad market, as the sector closes in on...

|By:, SA News Editor

Shares of big oil companies sink even further than the broad market, as the sector closes in on a 10th consecutive losing session. Global economic woes weigh heavy on the prospect for oil demand. Losers: Royal Dutch Shell (RDS.A -4.7%), Petrobas (PBR -7.2%), Marathon Oil (MRO -5.3%), Valero Energy (VLO -6.4%), Chevron (CVX -4.3%), BP (BP -4.1%).