China’s e-commerce giant Alibaba Group reported robust growth in second quarter revenues, a positive sign for its expected IPO in the United States.

Alibaba’s trading volume in the second quarter on its three major platforms, Taobao, Tmall and Juhuasuan, reached ¥501 billion ($81.3 billion), up 45.1 percent year on year, according to its updated prospectus.

Alibaba’s second quarter revenues were ¥15.7 billion ($2.6 billion), up 46.3 percent over the previous year.

Alibaba, whose IPO could be the largest ever by a technology company, said trading volumes on its mobile platforms in the second quarter reached ¥164 billion ($26.7 billion), almost tripling those of the same period of last year.

Alibaba had 279 million active buyers by the end of June, according to the filing, 24 million more than that at end of the first quarter.

Alibaba is expected to start its roadshow in early September in Hong Kong and Singapore, a company source said on condition of anonymity.

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Alibaba first filed for its IPO with the U.S. Securities and Exchange Commission (SEC) on May 6. Afterward, the company submitted three amended prospectuses to the SEC on June 16, June 26 and July 11.

Alibaba, which the Wall Street Journal called “a mix of Amazon, eBay, and PayPal with a dash of Google,” had a gross merchandise volume of ¥1.5 trillion ($248 billion) in 2013 on its three major trading platforms, more than those of eBay and Amazon.com combined.

Analysts expect the company to raise $15 to 20 billion (¥92.6 to 122 billion) through the IPO, likely challenging social networking company Facebook’s $16 billion (¥98.2 billion) offering in 2012 and credit card company Visa’s $19.7 billion (¥121 billion) IPO in 2008.

Report compiled with information from CCTV News and Reuters.