The VN-Index slid almost half a percent on Tuesday as investors took profits after a nearly 2.5% rally over the previous two trading sessions. ROS (-7.0%) fell to its trading floor for a second straight day. The construction firm surged 1,600% from its listing on HOSE on September 1, 2016 to March 15, 2017 to become one of the ten biggest listed firms by market capitalization, and has since fallen 25%.