Whats that I hear....FOMC special meeting......surprise rate cut......LOL
I downloaded historical SPY from Yahoo Finance going all the way back to 1993. Backtested buying one share at close and selling back that share at open the next day. After 25 years, I netted 0% profit, not counting commissions and slippages.Buy the cash close sell the cash open......Does not work everyday, but it works enough. Read article below.
https://www.nytimes.com/2018/02/02/your-money/stock-market-after-hours-trading.html