Stock market today: Dow, S&P 500, Nasdaq rise amid hopes of US-Iran talks, oil falls below $100

Oil prices have jumped more than 40% since Feb. 28, when the U.S. and Israel attacked Iran.

Jetblue reportedly hiring advisers to explore potential deal, and the stock zooms 15%.

Retail investors have loaded up on stocks, which is typical before a bull market peaks.

Server makers could benefit from a possible easing of memory pressures and renewed interest in central processing units.