(Updates with closing market levels, adds details on Nvidia ( NVDA )

results)

* Treasury yields fall while US stocks end up

* Oil prices drop sharply

* Nvidia ( NVDA ) shares down slightly after the bell following

results

By Caroline Valetkevitch and Alun John

NEW YORK/LONDON, May 20 (Reuters) - U.S. Treasury yields

and oil prices fell on Wednesday as hopes increased that the

U.S. is nearing a deal with Iran to end the war in the Middle

East, while major stock indexes rose with chipmaker shares ahead

of Nvidia's ( NVDA ) quarterly results.

Investors continued to monitor headlines for signs of progress

in U.S. negotiations with Iran to end the war. U.S. President

Donald Trump said on Wednesday that negotiations with Iran were

in the final stages, while warning of further attacks unless

Iran agrees to a deal. Trump also said the United States was

willing to wait a few days for the "right answer" from Iran.

The U.S. dollar fell from a six-week high, while U.S. crude

fell $5.89 to settle at $98.26 a barrel. Brent

dropped $6.26 to settle at $105.02.

There were also tentative signs of easing pressure from the

Gulf on Wednesday, as two Chinese oil tankers exited the Strait

of Hormuz, shipping data showed.

The yield on benchmark U.S. 10-year notes fell

9.4 basis points to 4.576%, from 4.669% late on Tuesday. Yields

had risen to multiyear highs recently on war-driven inflation

fears.

Nasdaq led gains on Wall Street, while consumer

discretionary was up the most among S&P 500 sectors.

"There's renewed positive sentiment because oil prices are

down, yields are down," said Jake Dollarhide, CEO of Longbow

Asset Management in Tulsa, Oklahoma.

But he added: "There is pessimism on the horizon because

higher oil prices for longer put the Fed in a corner."

Fed funds futures traders are pricing in roughly 50% odds

that the Federal Reserve will raise rates by December - a sharp

reversal from before the Iran war began in late February, when

markets had expected two cuts this year.

The Dow Jones Industrial Average rose 645.47 points,

or 1.31%, to 50,009.35, the S&P 500 rose 79.36 points, or

1.08%, to 7,432.97 and the Nasdaq Composite rose 399.65

points, or 1.55%, to 26,270.36.

MSCI's gauge of stocks across the globe rose

9.86 points, or 0.90%, to 1,101.65.

The pan-European STOXX 600 index rose 1.46%.

Longer-dated bonds have also sold off in Europe and Japan,

but as with Treasuries, they found some relief on Wednesday.

Germany's 10-year yield, the euro zone benchmark, fell 3

basis points from Tuesday's 15-year high to 3.16%.

Benchmark 10-year U.S. Treasury yields reached a 16-month

high on Tuesday, while 30-year yields hit their highest level

since 2007.

NVIDIA RESULTS, SPACEX FILING

Nvidia shares were down slightly after the closing

bell, with the company forecasting second-quarter revenue above

Wall Street expectations and announcing an $80 billion share

repurchase program. Its stock ended the regular session up 1.3%.

An index of semiconductors ended the session up 4.5%.

Also after the closing bell, SpaceX unveiled its IPO filing,

opening the books of the company that has revolutionized rocket

technology. The listing is poised to become the first

trillion-dollar U.S. market debut.

In currency markets, the dollar index, which measures the

greenback against a basket of currencies including the yen and

the euro, fell 0.22% to 99.09, with the euro up 0.22% at

$1.163.

Against the Japanese yen, the dollar weakened 0.14% to

158.81.

Spot gold rose 1.39% to $4,543.55 an ounce.