Jack Ma joins Alibaba's $4 bn shares buy-back

Currently Jack Ma owns 7.6 per cent of Alibaba and Joe Tsai owns 3.1 per cent

Chinese e-commerce giant Alibaba's founder and chairman Jack Ma and vice chairman Joe Tsai on Monday said they would use their own money to buy the company's shares as it began a two-year plan to buy-back shares worth $4 billion.

China's biggest e-commerce company, however, did not disclose, in its filing to the New York Stock Exchange, how much the two will invest in the buy-back as affiliated purchasers.

Currently Jack Ma owns 7.6 per cent of Alibaba and Joe Tsai owns 3.1 per cent.

The repurchase plan failed to significantly boost Alibaba's share price.

Its shares rose 0.08 per cent to $74.82 dollars at 9.56 am local time in New York, slightly higher than its IPO price of $68 dollars, state-run Xinhua news agency reported.

The Hangzhou-based company was listed on the New York Stock Exchange in September last year.

Amid expectations of weaker growth, its shares have fallen from its all-time high of 120 dollars in November.

Alibaba on Wednesday, when it first revealed the company's share repurchase plan, posted slower-than-expected revenue growth of 28 per cent to reach 20.2 billion yuan ($3.2 billion) in the second quarter of the year.

The growth represents a slowdown from 40 per cent in the fourth quarter of last year, and 45 per cent in the first quarter of this year, as a slowing economy dragged down consumer spending.