China's largest hypermarket operator has suspended the trading of its Hong Kong-listed stock since Friday pending an announcement on mergers and acquisitions, fanning speculation that Alibaba Group Holding may divest its controlling shares.

Alibaba took control of Sun Art Retail Group from the Mulliez, a wealthy French family, for HK$28 billion (US$3.6 billion) in October 2020, as the e-commerce giant sought to synergise online shopping and offline hypermarkets under a "new retail" model.

Sun Art shares traded most recently at HK$1.79, down about 78 per cent from the price per share of about HK$8.1 that Alibaba paid at the time of its investment. Alibaba is the owner of the South China Morning Post.

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Sun Art did not provide details about potential takeovers or mergers in its stock exchange filing. The company declined to comment further. Alibaba did not immediately respond to a request for comment on Monday.

An Alibaba office building in Beijing. Photo: Reuters alt=An Alibaba office building in Beijing. Photo: Reuters>

The wait has raised market speculation about a partial or complete sell-off of Alibaba's Sun Art stake. The hypermarket operator has attracted "preliminary interest" from private equity firms, including DCP Capital and Hillhouse Investment, Bloomberg reported on Friday, citing unnamed sources.

A divestment by Alibaba is likely, according to analysts.

"There is a great chance that it will involve a change in equity, and in that case, the possibility of a change in Alibaba's equity is relatively high," said Kenny Ng, a strategist at Everbright Securities International.

"After all, Alibaba holds the majority of [Sun Art's] shares."

A sell-off by Alibaba would be in line with its recent moves to trim noncore assets and sharpen its focus on core businesses amid mounting challenges, including rising e-commerce competition and slow revenue growth.

"Now the big e-commerce platforms mainly concentrate on the lower-tier markets and operate under more competitive pressure, and it has become a general trend to shrink some noncore businesses," said Ng.

A divestment could signal a change in Alibaba's strategic positioning, according to Bai Wenxi, chief economist of China Enterprise Capital Union.

Sun Art's stores, which mainly include supermarket brands RT-Mart and Auchan, have pursued a new retail strategy after coming under Alibaba's control.