In the minutes before President Donald Trump's social media post on Wednesday pausing tariffs and sending the US stock market rallying, some unidentified options traders placed bets worth millions of dollars that the market would rebound, data shows.

President Donald Trump’s tariffs have spooked investors, with fears of an economic downturn driving a stock market sell-off that has wiped out $4 trillion from the S&P 500’s peak last month, when Wall Street was cheering much of Trump's agenda.