VN-Index slides to 6-week low as energy sector weighs on shares. The VN-Index extended a two-week decline as falling global oil prices weighed on energy stocks. The VN-Index fell 0.47% to 555.82, and is now down 4% since March 17 to its lowest level since February 19. Brent crude, which has slumped 8% since March 22, continued to fall in Asian trading on Monday, undermining investor sentiment for local energy players. The Oil & Gas sector dropped 5.1%, led down by PVD (-5.1%) and GAS (-2.7).