* Indexes up: Dow 0.99%, S&P 500 1.33%, Nasdaq 1.80%

* Marvell Technology ( MRVL ) jumps after Nvidia ( NVDA ) invests $2 bln

* Coreweave ( CRWV ) gains on $8.5 bln loan to expand AI

infrastructure

* US job openings fall more than expected in Feb

(Updates with late-morning trading)

By Purvi Agarwal and Twesha Dikshit

March 31 (Reuters) - Wall Street's main indexes advanced

on Tuesday, as investors cheered a report signaling potential

de-escalation in the Middle East conflict that has set the S&P

500 and the Dow on track for their biggest monthly decline in

nearly four years.

The Wall Street Journal reported on Monday that U.S.

President Donald Trump told aides he was willing to end the

military campaign against Iran even if the Strait of Hormuz

remained largely closed.

The month-long conflict has left the S&P 500 and the Dow on

track for their largest quarterly falls since early 2022. The

S&P 500 energy index is the only sector poised to end

March in positive territory, and log its biggest quarterly jump

on record, tracking a rally in oil prices.

"What we've seen from a messaging standpoint from the

administration is a bit of indication they may start to either

wind down or pivot," said Alonso Munoz, CIO at Hamilton Capital

Partners.

"You get these periods where the market gets so oversold

that you just have relief rallies on any indication that there's

good news."

The S&P 500 technology index added 1.6% as

chipmakers staged a recovery with Nvidia ( NVDA ) and Broadcom ( AVGO )

up 2.9% and 2.6%, respectively.

Tech stocks faced a selloff earlier this quarter, especially

software stocks as concerns mounted over AI-driven disruption

and lofty capital spending on the technology.

Coreweave ( CRWV ) rose 5.3% after securing an $8.5 billion

loan to expand AI infrastructure. Marvell Technology ( MRVL )

added 7.5% after Nvidia ( NVDA ) invested $2 billion in the

firm.

A 3.9% rise in Meta Platforms ( META ) and Alphabet's

2.8% gain lifted the communication services index

up 2.3%.

Nine out of 11 major S&P 500 sectors were in the green.

"If earnings perform well over the next month and a half,

financials and technology could really catch up to the rest of

the market and have significant outperformance," said Munoz.

At 11:55 a.m. ET, the Dow Jones Industrial Average

rose 445.59 points, or 0.99%, to 45,663.12, the S&P 500

gained 84.31 points, or 1.33%, to 6,427.88 and the Nasdaq

Composite gained 373.77 points, or 1.80%, to 21,168.20.

Last week, the Dow and the Nasdaq ended 10% below their

record high closes, confirming a correction. The small-cap

Russell 2000 confirmed it earlier this month.

U.S. job openings fell more than expected in February and

hiring dropped to the lowest level in nearly six years,

government data showed.

The oil spike stemming from the Iran conflict has revived

inflation worries, prompting money market participants to price

out any easing from the Fed this year, compared with two cuts

expected before the war broke out, per CME Group's FedWatch

Tool.

Among other movers, McCormick ( MKC ) shares fell 5.6%.

Unilever ( UL ) agreed to separate its food unit and merge it

with McCormick ( MKC ) in a cash-and-stock deal, valuing the spice maker

at about $44.8 billion.

Constellation Energy ( CEG ) dipped 8.3% after forecasting

2026 profit below Wall Street expectations.

Advancing issues outnumbered decliners by a 3.86-to-1 ratio

on the NYSE and by a 3.03-to-1 ratio on the Nasdaq.

The S&P 500 posted 5 new 52-week highs and 7 new lows while

the Nasdaq Composite recorded 23 new highs and 126 new lows.