By V. Phani Kumar, MarketWatch

HONG KONG (MarketWatch) -- Most Asian stock markets were course for strong weekly gains Friday after several frontline companies reported strong profit growth, while major miners in Australia got a boost from rising commodity prices.

Hong Kong's Hang Seng Index was again leading the region's advance, climbing 1%, while Taiwan's Taiex gained 0.4%, and Australia's S&P/ASX 200 rose 0.2% as Sydney investors returned after Thursday's Anzac Day holiday.

On the downside, South Korea's Kospi dropped 0.2% and China's Shanghai Composite slipped 0.4% in choppy moves that saw both benchmarks rise earlier.

Japan's Nikkei Stock Average was down 0.4% in similarly volatile trade, as investors awaited the Bank of Japan's monetary-policy decision later in the day.

Strong overnight cues from Wall Street, fueled by corporate earnings and a sharp drop in weekly jobless claims, supported the region's performance.

"Global share markets are in a sweet spot at present, with traders using good earnings reports to push stocks up, whereas any weak economic data is viewed as keeping monetary policy looser for longer," said Perpetual head of investment market research Matthew Sherwood.

Japan's Nikkei Average, with gains of more than 4% at its intraday levels, was set to lead the strong regional performance for the week. The Shanghai Composite was a major exception, down more than 2% so far this week.

Earnings-driven moves

Earnings-related news dominated trading in several regional markets including Japan, mainland China, Hong Kong and South Korea.

In Hong Kong, Bank of China Ltd. (BACHY) rose 1.7%, mobile-service provider China Unicom Hong Kong Ltd. (CHU) gained 1.3%, PetroChina Co. (PTR) added 2% and casino operator Wynn Macau Ltd. (WYNMY) climbed 3.2% after each reported earnings. (Read more on earnings from China Unicom, Bank of China, and PetroChina)

Shares of BYD Co. (BYDDY), the Chinese automobile and battery maker backed by billionaire Warren Buffett, soared 8.8% after its quarterly profits more than quadrupled.

In Shanghai, the mood was less upbeat amid lingering concerns about economic growth, and as investors remained cautious ahead of more blue-chip earnings reports due later in the day.

Shares of banking giants Industrial & Commercial Bank of China Ltd. (IDCBY), China Construction Bank Corp. (CICHY) and Agricultural Bank of China Ltd. (ACGBY) all took mild losses ahead of their quarterly reports.

Shanghai-traded shares of Bank of China lost 0.7%, and PetroChina eased 0.1%, untouched by gains recorded in their Hong Kong-listed stock.

Even so, some other major stocks saw earnings-related gains, with SAIC Motor Corp. climbing 0.3% and Baoshan Iron & Steel Co. adding 0.2%.

Hong Kong-listed insurer AIA Group Ltd. (AAGIY) rose 1.3% after posting a strong 25% increase in new business in the first quarter.

In Tokyo, meanwhile, Japan Tobacco Inc. (JAPAF) jumped 4.6% after it reported a 10% drop in fiscal fourth-quarter net profit but forecast its earnings in the current financial year will rise to a record level.

Shares of Sony Corp. (SNE) gained 0.6% after the company doubled its profit estimate for the year ended March 31 on the back of a weaker yen, asset sales and an improvement in its life-insurance business.

Komatsu Ltd. (KMTUF) climbed 2.2%, but Mitsubishi Motors Corp. (MMTOY) lost 3.3%, also driven by their respective earnings reports.

Stocks in Seoul came under pressure as shares of heavyweight Samsung Electronics Co. (SSNLF) dropped 0.6% even as the giant electronics maker company reported a record quarterly profit that rose 42% from the year-ago period, boosted by strong smartphone sales.

Other movers

Australian stocks rose as investors returned from Thursday's holiday, with the resource sector doing particularly well on recent gains in commodity prices.

BHP Billiton Ltd. (BHP) jumped 2.7% and Rio Tinto Ltd. (RIO) climbed 2.1%, while Newcrest Mining Ltd. (NCMGY) soared 5.6% after gold futures scored their best gain since June in the U.S. overnight.

In Tokyo, banks were generally weaker after their recent strong run, with caution setting in ahead of the Bank of Japan's monetary policy decision later in the day.

Mizuho Financial Group Inc. (MFG) gave up 0.9%, and Sumitomo Mitsui Financial Group Inc. (SMFJY) lost 0.7%.

In other financial news in Tokyo, the Nikkei newspaper reported that billions of yen in client money may have gone missing at a U.S. financial services firm.

The anonymously sourced report said Japan's Securities and Exchange Surveillance Commission couldn't account for some client assets at MRI International Inc. in an inspection that began last month.

Shares of Nissan Motor Co. (NSANY) fell 0.2%, less than the broader market losses, after the Nikkei newspaper reported the company and its French partner Renault SA (RNO.FR) plan to use common parts for production, a move that will slash development costs by about 30%.

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