It was not an isolated occurrence. Three days earlier, in the last 10 minutes of trading, someone bought 82,000 S&P e-minis when the index was trading at 2969. That was nearly 4 a.m. on September 11 in Beijing, where a few hours later, the Chinese government announced that it would lift tariffs on a range of American-made products. As has been the typical reaction in the U.S. stock markets as the trade war with China chugs on without any perceptible logic, when the news about a potential resolution of it seems positive, stock markets go up, and when the news about the trade war appears negative, they go down.
The news was viewed positively. The S&P index moved swiftly on September 11 to 2996, up nearly 30 points. That same day, President Donald Trump said he would postpone tariffs on some Chinese goods, and the S&P index moved to 3016, or up 47 points since the fortunate person bought the 82,000 e-minis just before the market closed on September 10. Since a one-point movement, up or down, in an e-mini contract is worth $50, a 47-point movement up in a day was worth $2,350 per contract. If you were the lucky one who bought the 82,000 e-mini contracts, well, then you were sitting on a one-day profit of roughly $190 million.