Sony (SNE:NASDAQ) opened up at a 12% gain, increase 2.30$ per share. Absolutely massive.

Konami followed suit, growing 11% with 2.50$ gain per share.

What about the other major Japanese companies? I find it hard to believe after those FY results. None of it indicated such a sharp rise.

Must be like a fiscal policy thing I'm thinking.

Well, the xperia xz released yesterday, possibly big sales numbers.

Also possibly that mockup console teased yesterday may have excited some.

Gaming won't affect Sony stock that much. Something bigger's going on here.

Did they decide to sell something?

No they havent. And yes, gaming would but not the mock up.

What break up?

likely it's the xperia releasing. Every foothold sony gets in the smartphone industry has the chance to spark a higher intraday stock price.

i wanted to buy sony stock for about 2000€ back in december 2012 but i lost my tan-list so i couldn't trade :( :( :(

Yen really hasn't changed since last week, and if anything has gone down.
the suggested break up of sony was just by a hedge fund manager....so it would be speculation on the part of investors, creaming at the thought of lopping off the weaker divisions into other companies. 

Sony Corporation (ADR) (NYSE:SNE) receives a good news on Tuesday that an American hedge fund billionaire recognized for initiate big fights has known for a “breakup of the entertainment and electronic colossus Sony”, the people declared the matter, probably explosion a battle that could roil Japan’s legendary staid corporate culture.

Government officials and corporate leaders in Tokyo will most likely view the call, which came Tuesday as a shot across the bow from Wall Street, while Western investors start piling into Japanese stocks.

Daniel S. Loeb, hedge fund manager, is pressing Sony into following-up part of its entertainment arm that comprises one of the largest film studios in Hollywood as well as one of the biggest music labels in the world, reliable for films like ‘Skyfall’ and artists like Taylor Swift.

Mr. Loeb recognized for expelling Yahoo! Inc. (NASDAQ:YHOO)’s former CEO and poaching Marissa Mayer from Google to run the firm, as well signaled that he would admit a seat on Sony’s board. His hedge fund has silently amassed a stake of around 6.5% in Sony, making it one of the largest shareholders.

The people briefed on the matter that Mr. Loeb, at the age of 51 year, the founder of the hedge fund Third Point, flew to Tokyo this previous weekend for 3 days of meetings with government officials, regulators, and senior Sony managers. He hand-delivered a letter on Tuesday to the firm’s CEO, Kazuo Hirai that praises a bounce back effort however requests for more.

Mr. Loeb articulated in the letter that while Third Point supports their agenda for change, they also suppose that to succeed, Sony must focus.

He added that Third Point would not have made this considerable investment if they did not consider in a bright future for Sony’s worldwide brand, advanced technology, and enthusiastic employees. They are secure that by performing as partners, Sony will grow stronger.