* Indexes up: Dow 0.57%, S&P 500 0.84%, Nasdaq 1.01%

* Intel ( INTC ) jumps after reported talks with Apple ( AAPL ) for

chipmaking

* Archer-Daniels-Midland ( ADM ) up following Q1 profit beat

(Updates with afternoon trading)

By Niket Nishant and Utkarsh Hathi

May 5 (Reuters) - Wall Street's main indexes jumped on

Tuesday as the U.S.-Iran ceasefire held firm despite the latest

flare-up in tensions, allowing investors to shift focus to

artificial-intelligence stocks and corporate earnings.

Washington said on Tuesday the ceasefire with Iran was

intact, allaying worries that attempts by both sides to assert

control over the Strait of Hormuz would lead to an escalation in

hostilities.

With those fears easing somewhat, for now, investors were

able to refocus on the fundamentals that have underpinned

company earnings.

Chip designer AMD's shares rose 3.2% ahead of

results, due after market close. Intel ( INTC ) rose 12.3% after

Bloomberg News reported that Apple ( AAPL ) had held exploratory

discussions about enlisting the company's chipmaking services to

produce the main processors for its devices.

The Philadelphia SE Semiconductor index gained 4.2%,

while S&P 500 technology stocks rose 1.5%, both

hitting all-time highs.

"What has stood out repeatedly is the resilience of

corporate America," said Brian Levitt, chief global market

strategist at Invesco.

"It's reasonable to expect that the geopolitical landscape

will remain noisy. (But) the underlying businesses that make up

the market will still be able to deliver growth."

At 12:25 p.m. ET, the Dow Jones Industrial Average

rose 277.80 points, or 0.57%, to 49,219.70, the S&P 500

added 60.35 points, or 0.84%, to 7,260.83, and the Nasdaq

Composite gained 252.42 points, or 1.01%, to 25,320.22.

Brent crude futures lost 3.5% but were still

trading above $110 a barrel.

Ten of the 11 main S&P sectors were in the green.

RISKS FROM ELEVATED OIL PRICES PERSIST

As a net energy exporter, the U.S. has so far held up better

than several other economies. But some investors believe that is

no justification for unfettered optimism, warning markets may

not be fully pricing in risk.

"Even U.S. equities won't be insulated" if the Strait of

Hormuz does not open, BlackRock Investment Institute analysts

led by Global Chief Investment Strategist Wei Li said in a note.

The Federal Reserve also appeared unlikely to provide relief

in the near term after data released on Tuesday showed U.S. job

openings fell to 6.866 million in March, slightly above the

6.835 million estimate. This reinforced the view that labor

market resilience could give the central bank room to keep

interest rates higher for longer.

The Institute for Supply Management's non-manufacturing

purchasing managers' index for April came in at 53.6, also

narrowly missing the estimate of 53.7, according to economists

polled by Reuters.

Meanwhile, grain trader Archer-Daniels-Midland ( ADM ) rose

5.6% after reporting better-than-expected first-quarter profit

on higher margins.

DuPont ( DD ) gained 8.5% after the industrial materials

maker lifted its annual profit forecast.

Shares of Pinterest ( PINS ) soared 9.2% after the

image-sharing platform forecast second-quarter revenue above

analysts' estimates.

Advancing issues outnumbered decliners by a 2.69-to-1 ratio

on the NYSE and by a 1.69-to-1 ratio on the Nasdaq.

The S&P 500 posted 42 new 52-week highs and 21 new lows,

while the Nasdaq Composite recorded 134 new highs and 68 new

lows.