By V. Phani Kumar, MarketWatch

HONG KONG (MarketWatch) -- Japanese stocks ended at a fresh multiyear high Wednesday after the country's central bank raised its economic outlook, even as it left other elements of the monetary policy unchanged.

Australian and Hong Kong shares reversed early gains in choppy trade amid caution ahead of Fed Chairman Ben Bernanke's testimony before Congress later in the day.

"Any insight gained from Bernanke's address could have a significant bearing on all markets globally," said CMC Markets analyst William Leys.

Japan's Nikkei Stock Average climbed 1.6% to end at its highest level since December 2007. The benchmark extended gains after Bank of Japan's policy decision. The broader Topix added 0.4%, well off the day's highs.

Elsewhere in Asia, South Korea's Kospi gained 0.6% and Taiwan's Taiex added 0.2%.

On the downside, Australia's S&P/ASX 200 declined 0.3% and China's Shanghai Composite slipped 0.1%, after struggling to hold gains recorded earlier in the day.

The Hang Seng Index lost 0.5% in a shortened session, after the morning trading session was canceled due to a rain storm in Hong Kong.

Most regional markets found support as key U.S. equity indexes ended at record levels Tuesday, after comments from New York Federal Reserve President William Dudley and St. Louis Fed President James Bullard were interpreted as suggesting the central bank wasn't about to taper off its bond-purchase program.

"If there is any hint of a wind-down in the near term, we could see the U.S. dollar continue to strengthen at the expense of its currency counterparts, as well as commodities. Alternatively, renewed commitment to the program may curtail the recent trend of [dollar] favor," said CMC Markets' Leys.

Among the major stock movers in Tokyo, shares of Canon Inc. (CAJ) added 2.2%, Panasonic Corp. (PCRFY) rose 2%, and Daikin Industries Ltd. (DKILY) advanced 2.2%.

"While the deep pockets of value are no longer there, Japanese equities present investors with attractive opportunities both at the 'distressed' end of the market, as well as at the 'quality' end," Deutsche Bank analysts wrote in a report issued Tuesday.

"A prolonged period of yen strength forced companies into restructuring, given the export-driven nature of the market. Together with the high operational leverage, this will produce strong earnings revisions in the coming 12 months," Deutsche Bank said in its report.

Japanese stocks are the best performing among the major global share markets so far in 2013, with the Nikkei Stock Average up more than 50% from last year's closing level.

Shares of Mitsubishi Motors Corp. (MMTOY), which had jumped more than 10% earlier on Wednesday, after leaping 34% in the previous session, reversed course as investors locked in profits. The stock ended 6.6% lower.

Sony Corp. (SNE) soared 5.9%. The gains followed a similar surge for its American Depository Receipts in U.S. after-hours trading, after rival Microsoft Corp. (MSFT) unveiled its Xbox One gaming console. Also read: Translation error boosts Sony stock.

Meanwhile, official Japanese data released earlier in the day showed the country's trade deficit widened sharply in April, as exports grew at a slower-than-expected 3.8% from the year-ago period, while imports jumped 9.4%.

Stocks in Hong Kong suffered a drag from a 1.1% drop for HSBC Holdings PLC (HBC), as the heavyweight bank began to trade without rights to its dividend.

Shares of China Galaxy Securities Co. rose 6% on their debut, ending at 5.62 Hong Kong dollars (72 U.S. cents), compared with the initial public offering at HK$5.30 (USDHKD).

In Sydney trading, high dividend-yielding stocks such as banks remained under pressure, although the big diversified miners advanced to provide some support in the wake of strong cues from the U.S.

Westpac Banking Corp. (WBK) dropped 0.9% and National Australia Bank Ltd. (NABZY) fell 1.2%. In the resources sector, BHP Billiton Ltd. (BHP) climbed 1.3%, and Rio Tinto Ltd. (RIO) gained 1.8%.

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