June 8 (Reuters) - Most U.S. stocks closed higher on Monday, boosted by gains in the Nasdaq index and chipmakers, as investors sought to capitalize on opportunities after Friday's sharp sell-off and were relieved after Iran and Israel said they had halted their tit-for-tat attacks.

The cessation of attacks came after a call from US President Donald Trump for them to "stop firing" immediately.

The attacks, which continued for the past 24 hours, were the biggest direct confrontation between Iran and Israel since the ceasefire in April.

The Dow Jones closed lower, with all its constituent stocks closing below their intraday highs. Apple shares declined late in the session, despite the company unveiling a series of AI-powered updates to its Siri voice assistant.

The technology sector in the Standard & Poor's 500 and Philadelphia Semiconductor Index rose to recover from Friday's losses that wiped $1 trillion off the market value of U.S.-listed chip companies.

Intel shares jumped after The Information news site reported that Alphabet's Google had placed an order to manufacture more than three million Tensor processors in 2028.

"Today looks like a bargain-snatcher day after the sell-off in Big Tech stocks," said Rick Meckler, a partner at Cherry Lane Investments in New Jersey. "What usually happens next is that analysts come in and reaffirm their buy recommendations."

Preliminary data showed the S&P 500 rising 22.07 points, or 0.30 percent, to close at 7405.81, while the Nasdaq Composite climbed 222.13 points, or 0.86 percent, to 25931.56. The Dow Jones Industrial Average fell 75.61 points, or 0.15 percent, to 50791.17.