Vietnamese shares mixed for the first trading session in June. Vietnamese market closed mixed following Asian markets down on weak China factory data. Despite the market opening slightly on the upside, selling pressure accelerated toward the end of the afternoon session on the southern bourse, dragging VNIndex to the negative territory. STB unexpectedly had 26 million shares traded in put-through accounting for almost half of trading turnover on the HSX on the same day it announced a CEO change.