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Alibaba sets $US68 price tag on shares in IPO

Chinese internet giant Alibaba is a step closer to launching what could become the most valuable share market float in history.

The online wholesaling, retail and payments service set up by former English teacher Jack Ma 15 years ago has released the final details of its listing.

It is selling 320 million shares for $US68 each, with a total offer value of almost $US22 billion.

That makes the initial public offering the third most valuable ever.

However, analysts say it could top that list, with some of the investment banks underwriting the float to sell their shareholdings when the stock begins trading on Wall Street tonight.

The listing price is at the upper end of previous guidance and gives the company a total value of almost $US170 billion.