The VN-Index fell for the first time in four days, giving up 1.1% on Thursday. GAS (-5.4%) was the top contributor to the day's loss as the price of Brent crude oil dropped in Asian trading today. The overall energy sector slid 3.0% amid losses in PVD (-6.3%), PLX (-2.8%), PVT (-3.2%) and Hanoi-traded PVS (-4.4%).