TOKYO, May 21 (Reuters) - Japan's Nikkei share average

climbed more than 3.5% on Thursday, its biggest gain in two

weeks, on renewed enthusiasm for technology stocks and easing

geopolitical tensions linked to the Iran war.

The benchmark Nikkei 225 Index climbed 3.58% to

61,945.34, and is set for its sharpest daily gain since May 7,

if the current momentum holds. The broader Topix climbed

2.21% to 3,875.34.

The Nikkei mirrored Wall Street gains ahead of earnings from

AI bellwether Nvidia, which forecast sales above market

estimates.

Oil prices dropped sharply overnight after U.S. President

Donald Trump said negotiations to end the war in Iran were in

the final stages, easing supply concerns.

Investor sentiment also got a boost from an averted labour

strike at Samsung Electronics ( SSNLF ), which could have

disrupted South Korea's economy and global chip supply, and from

reports that OpenAI is preparing to go public. SoftBank Group

, a major investor in the company and other AI ventures,

surged to its daily limit.

"The market is being led by AI and semiconductor-related

shares following developments including the avoidance of a

strike at Samsung Electronics ( SSNLF ) and Nvidia's earnings," said

Wataru Akiyama, an equities strategist at Nomura Securities.

"We're seeing gains across a wide range of sectors due to

the drop in crude oil prices."

There were 156 advancers in the Nikkei index against 69

decliners. The largest percentage gainers were SoftBank Group,

up 19.9%, followed by Socionext ( SOCNF ), which jumped 17.2%,

and Ibiden ( IBIDF ), trading 15.2% higher.