Market-wrap: Stocks experience biggest drop since March 25. In its biggest single day drop since March 25 of this year, the VN-Index plunged 1.7% on Monday, mirroring other Asian markets in response to US President Donald Trump’s renewed tariff threat on China. Today’s session saw 230 losers to just 81 gainers. GAS (-4.1%) was the biggest contributor to the loss. BVH (-4.9%) continued its losing streak and has declined 20.6% over the past six trading sessions.