Stocks making the biggest premarket moves: Shake Shack, Charles Schwab, H&R Block, DuPont and more – CNBC May 15, 2023 Stocks making the biggest premarket moves: Shake Shack, Charles Schwab, H&R Block, DuPont and more CNBC Source: Stocks making the biggest premarket moves: Shake Shack, Charles Schwab, H&R Block, DuPont and more – CNBC Updated: May 15, 2023 at 12:11 pm ◀ Three-quarters of skateboards tested by Hong Kong consumer watchdog fail Euro safety standards and five flop in drop test, report reveals 4 killed in Detroit when SUV crashes into highway bridge pier ▶