Well, this is only my opinion, OK.
It's because the news that said Sharp had decides to do the capital increase.
Nikkei up 2.99% last night, but Sharp and the entire electronics sector was down. Sharp 5.75%, Panasonic 2.24%. SONY was up, but only 0.71% up.
Also, Yen is bit stronger recently due to the Euro’s uncertain economic problem. As you know, SONY has more business than other Japanese big companies In Europe. Moreover, Japan’s biggest concerning today is the bank of Japan’s meeting. The newly nominated chairman of BOJ will make announcement about their economic policy today, at around 12:30PM in Japan (17:30 pm, US ET)
It is said the expected new policy -- the quantitative easing -- has been included in the Japanese stock prices already. So, it is possible that Yen keeps its strength for while if the chairman’s statement is not as they expected. That case is not good news for the company like SONY whose export business depends on the currency rate.
However, if the market can confirm that the quantitative easing policy is really decided by BOJ, Yen will be weaker and it is good for the company like SONY. By the way, the BOJ meeting will be held later this month as well, so the market doesn’t need much surprise policy change this time, they just need to confirm the new chairman’s guts to fight with the deflation in Japan. Well, of course, they don’t mind to hear the other surprise news as well.
Hence, I think buying SNE without hearing the statement is kinda risky, that is why SNE is down today. However, the chairman is known as a pretty aggressive deflation fighter, he won’t disappoint the market. SNE will be up later today, hedge funds are risk on now, before the closing. It’s big time. Good luck.
Yes, it was all about the Bank of Japan and the strengthening Yen. But now the BOJ has introduced a new policy which will end deflation, and as a result the Yen went plummeting sharply after the announcement. And now confidence is back and the market is regaining it's losses.