Stocks making the biggest moves premarket: Delta Air Lines, WK Kellogg, PTC, AMD and more

Check out the companies making headlines in premarket trading. Delta Air Lines — Shares advanced nearly 12% before the opening bell after the airline reinstated its 2025 profit outlook , and second-quarter revenue and net income exceeded analyst estimates. Brazilian stocks — The iShares MSCI Brazil ETF (EWZ) dropped nearly 2% premarket after President Donald…

Tripadvisor stock surges 17% as Starboard Value builds sizable stake in online travel company

The Tripadvisor logo is displayed on a tablet. Mateusz Slodkowski | Sopa Images | Lightrocket | Getty Images Tripadvisor stock jumped 17% Thursday after Starboard Value revealed a more than 9% stake in the online travel company, according to a securities filing. The position was valued at about $160 million as of Wednesday’s close. “We…