* Indexes up: Dow 1.39%, S&P 500 1.64%, Nasdaq 2.08%

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

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

infrastructure

* JOLTS data slightly below expectations

(Updates on market open)

By Purvi Agarwal and Twesha Dikshit

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

Tuesday, as markets 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

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, soothing some investor nerves.

The month-long conflict has battered global markets and left

the S&P 500 and the Dow on track for their largest monthly falls

since September 2022. The benchmark S&P 500 was also headed for

its worst quarter since 2022.

Oil prices were volatile on Tuesday, but were headed for a

record monthly gain. The S&P 500 energy index has gained

more than 11% so far in March, the only sector set to end the

month in positive territory. It would also be the sector's

biggest quarterly gain on record.

"The move in markets is reflecting what traders want to see,

what they hear. They would like to hear that resolution to this

is quick," said Mark Malek, CIO at Siebert Financial.

Malek said oil prices were still high because the Strait of

Hormuz was closed and that would ultimately "cause damage" to

the economy.

The S&P 500 technology index added 2% after facing

a selloff this quarter, driven by concerns about lofty capital

expenditure plans. Software stocks were hit by worries over

AI-driven disruption to their services.

Coreweave ( CRWV ) rose 8.4% after securing an $8.5 billion

loan to expand AI infrastructure. Marvell Technology ( MRVL )

added 6.8% after Nvidia ( NVDA ) invested $2 billion in the

firm.

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

2.5% gain lifted the communication services index

up 2.2%.

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

At 10:05 a.m. ET, the Dow Jones Industrial Average

rose 627.92 points, or 1.39%, to 45,844.06, the S&P 500

gained 103.78 points, or 1.64%, to 6,447.50 and the Nasdaq

Composite gained 432.71 points, or 2.08%, to 21,227.35.

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.

JOLTS data for February showed job openings fell to 6.882

million, slightly below estimates of 6.918 million, while

consumer confidence came in above estimates.

Comments from Fed policymakers, including Austan Goolsbee

and Michelle Bowman, will also be parsed for any clues on the

monetary policy path.

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 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 7.1% after forecasting

2026 profit below Wall Street expectations.

Advancing issues outnumbered decliners by a 5.23-to-1 ratio

on the NYSE and by a 4.21-to-1 ratio on the Nasdaq.

The S&P 500 posted 3 new 52-week highs and 3 new lows, while

the Nasdaq Composite recorded 19 new highs and 85 new lows.