Top 20 US stock transactions: Nvidia falls more than 6%. The US government is considering implementing stricter trade control measures. On Wednesday, Nvidia, ranked first in US stock transactions, closed down 6.62% and traded $45.716 billion. The trade policy risks of the US government have put special pressure on the semiconductor sector in technology stocks. According to reports, the US government is considering implementing stricter trade control measures to prevent some technology companies, including Nvidia, from providing technology to specific countries.