Recasts with preliminary close of trading, adds analyst comment

By Stephen Culp and Medha Singh

NEW YORK, June 2 (Reuters) - The S&P 500 and the Dow closed modestly higher on Tuesday as risk appetite driven by AI fervor was counterbalanced by tensions arising from U.S.-Iran talks to reopen the Strait of Hormuz and end the months-long war.

Gains in most of the 11 major S&P sectors kept the S&P 500 and the Dow in the green, with the small-cap Russell 2000 .RUT outperforming its larger-cap peers. The Nasdaq ended the session essentially unchanged.

Small-cap stocks have been some of the biggest beneficiaries of the ongoing enthusiasm surrounding artificial intelligence stocks, which provided some upside muscle. The Philadelphia SE Semiconductor Index advanced on the day.

The Software & Services Index .SPLRCIS, battered in recent months over worries of AI disruption, closed in negative territory.

Strong results from Hewlett Packard Enterprise HPE.N and a funding commitment from Alphabet GOOGL.O reinforced confidence in the AI buildout.

"The market is kind of muted at the surface level, but there is a lot going on under the hood, and that describes much of this year," said Mike Dickson, head of portfolio management at Horizon Investments in Charlotte, North Carolina. "There's some massive dispersion in the whole AI infrastructure ecosystem."

"Markets could be in for one of these heated, melt-up rallies where the momentum keeps winning," Dickson added. "I would not be surprised at all to be sitting here at the end of the summer a good bit higher."

Tehran is studying a U.S. proposal to bring the war to a halt, but has not been in contact with Washington for days, according to Iranian media, which also said Iran is taking a "stern" approach, given what it views as a history of U.S. noncompliance and mutual distrust.

Simultaneously, Israel is continuing its strikes on Lebanon, despite Tehran's warnings that the attacks are threatening to derail the fragile truce.

The war has sent crude prices soaring, reviving worries over inflation and giving rise to an increasing likelihood that the U.S. Federal Reserve could hike interest rates by year-end.

Cleveland Fed President Beth Hammack said on Tuesday that such a hike could become necessary if already-elevated inflation pressures continue to mount.

On the economic front, a report from the Labor Department showed an unexpected spike in job openings, driven by the volatile professional and business services sector. Otherwise, hiring, firing and quits all decreased, suggesting a slowdown in labor market churn in the face of uncertainties related to strife in the Middle East and inflationary effects.

Analysts look to the May employment report due on Friday, which is expected to show the U.S. economy added 85,000 jobs last month, a monthly deceleration of 26.1%. The unemployment rate is forecast to stand pat at 4.3%.

According to preliminary data, the S&P 500 .SPX gained 10.07 points, or 0.13%, to end at 7,610.03 points, while the Nasdaq Composite .IXIC gained 8.78 points, or 0.03%, to 27,095.59. The Dow Jones Industrial Average .DJI rose 237.13 points, or 0.46%, to 51,316.01.

Hewlett Packard Enterprise jumped after the AI server maker pulled forward its long-term financial targets by two years.

In further evidence of AI buildout, Alphabet GOOGL.O said it was looking to raise $80 billion in equity offerings, including an investment from Berkshire Hathaway, to fund a costly expansion of its AI infrastructure. Its shares lost ground on the day.

Marvell Technology's MRVL.O shares surged after Nvidia NVDA.O Chief Executive Officer Jensen Huang called the chipmaker the next "trillion-dollar company" at the Computex conference in Taipei. Nvidia invested $2 billion in Marvell in March.

A drop in bitcoin BTC= hit cryptocurrency firms Coinbase COIN.O and Strategy Inc MSTR.O.

Broadcom AVGO.O is expected to report quarterly results on Wednesday.