Tags VCW shares Shares of Vinaconex Water Supply JSC plunge on contaminated water reports Thursday, Oct 17, 2019 Shares of the Vinaconex Water Supply Joint Stock Company (Viwasupco) fell sharply on Thursday after a series of reports about poisoned tap water, which cut VND127 billion (US$5.4 million) from the company’s market capitalisation in one day.