Mumbai: Two Indian companies - Siemens India the Indian unit of German conglomerate Siemens AG, and real estate major Unitech - have made it to the top of a list of Asia's 50 best performing companies, compiled by international financial magazine BusinessWeek.

China's Alibaba.Com, China Molybdenum and Japan's Inpex Holdings complete the top five tally.

A total of seven Indian companies have made to the top 20 positions -   drugmaker Cipla (sixth), ABB India (12th), Tech Mahindra (13th), Hindustan Zinc (17th) and DLF (18th).

Other Indian companies on the list include BHEL (27th), ITC (45th) and TCS (50th).

India also had the maximum representation in the list with a total of 10 companies. China had eight , Hong Kong six, Indonesia, Taiwan and Pakistan five each, Singapore four, Korea three and Japan and Malaysia two each.

However, India accounted for just about one per cent of the worldwide wealth market size of over $109 trillion in 2007. The global wealth market grew by 4.9 per cent over the previous year, according to a report by global consultancy major Boston Consulting Group.

The rankings, compiled by Standard & Poor's Compustat, are based on average return on capital and sales growth over the past three years, BusinessWeek said.

The year's ranking of Asia's best-performing companies attests to the continuing dynamism of India and Greater China, the report said.

Among sectors, infrastructure and high tech made the strongest showings, it noted.

While the wealth market in India was growing rapidly, the report said the country accounted for only a small fraction of the global market with a size of $1.4 trillion.

The study calculated the wealth market size on the basis of asset under management (AUM), which includes cash deposits, money market funds, listed securities held directly or indirectly through managed investments and onshore and offshore assets.

The number of billionaires in India has gone up to 53, from 36 last year, according to a study released by US business magazine `Forbes'' earlier this year.

Collectively, the 53 Indian billionaires command a net worth of over $340 billion, nearly a third of the total wealth.