Stock market struggles amid inflation concerns and mixed futures.

Stocks dropped on Thursday as an inflation gauge rose at a slightly slower pace than expected in April and investors' concerns about the banking sector continued. The S&P 500 was 0.6% lower, the tech-heavy Nasdaq dipped 0.2%, and the Dow dropped more than 1%, or nearly 400 points. Bond yields fell, and the dollar strengthened. PacWest was recently off some 18%, while an index of regional banks dipped 1.6%.