MUMBAI (AFP) - US billionaire investor George Soros has bought a four percent stake in the Bombay Stock Exchange for almost 35 million dollars, a spokesman for the stock exchange said on Friday. Soross Quantum hedge fund acquired the stake in Asias oldest exchange from Dubai Financial, part of state-run Dubai Holdings, which is owned by United Arab Emirates prime minister Sheikh Mohammed bin Rashid al-Maktoum. Soros paid 375-380 rupees per share, the spokesman said, asking not to be named. There is growing interest in the thriving BSE as Indias economy goes from strength to strength, with the latest deal valuing the exchange at 800 million dollars. It is also a boost for the BSE, which clocks average daily trading volume worth 1.2 billion dollars, as it battles with close rival National Stock Exchange (NSE) for market share. The Mumbai-based NSE, which was Indias first computerised stock exchange, was set up by local financial institutions with government backing and quickly became a rival to its more established competitor. The BSE, which was hit by the deadly Mumbai bombings in 1993, lists nearly 5,000 companies, including blue-chips Reliance Industries and software exporter Infosys Technologies. The exchange, where brokers first started trading under banyan trees, began online trading in 1995 and turned corporate, from an association, in 2005. The BSE showed an 11-percent dip in first-quarter net profit at 510 million rupees (10.8 million dollars) for the three months to June, on revenues of 1.13 billion rupees. Foreign investors hold a nearly 30-percent stake in the BSE, including the Deutsche Boerse and Singapore stock exchange, which each have five percent. US-based philanthropist George Kaiser also holds a four-percent stake in the BSE through his investment firm Argonaut Ventures. Foreign investors can buy up to 49 percent of the company, according to its rules.