US major indices opened higher on Tuesday, rebounding from the previous session's selling pressure. Tech stocks, particularly semiconductor stocks, saw a significant rally, with the semiconductor index rising 1.7% and the Nasdaq 100 gaining 0.7%. Meanwhile, oil prices fell, leading to a decline in Treasury yields for a second consecutive day. The positive sentiment in the tech sector was bolstered by reports that the US will send diplomatic personnel back to embassies in the Middle East, which helped ease concerns over potential escalation in the US-Iran conflict.