South Korea’s KOSPI tripped circuit breakers in early Monday local trading and is down roughly 7.25% as of 10:45 p.m. ET, an abrupt break in what had been the top-performing major market in the world this year. The question now: does the contagion hit the Nasdaq when New York opens? What’s Happening in Overnight Trading … The Korean Stock Market Just Crashed Sunday Night. Will the Nasdaq Follow Tomorrow?