S&P 500 futures jumped 0.7% to 7,542.25, Nasdaq 100 up 0.9% to 29,831.75, Dow Jones advanced 0.6% to 51,016.0.
Investor optimism stemmed from President Donald Trump's comment that Iran talks were proceeding nicely and a possible MOU to reopen the Strait of Hormuz.
Fresh U.S. strikes on missile sites in southern Iran were described as defensive and did not signal an end to cease‑fire hopes.
Oil rebounded about 2%, with Brent near $98/barrel and U.S. crude around $92/barrel, while markets await Thursday's PCE inflation data.