By Cynthia Koons, P.R. Venkat and Abhrajit Gangopadhyay 
 

Insurers Manulife Financial Corp. (MFC.T), MetLife Inc. (MET) and ACE Insurance are among the shortlisted bidders for a majority stake in the life insurance division of Malaysian banking group AMMB Holdings Bhd. (1015.KU), a deal that could be worth as much as $600 million, people with knowledge of the sale process said.

The country's fifth-largest banking group kicked off the sale in April with the aim of divesting up to 70% of its insurance businesses AmLife Insurance Bhd. and AmFamily Takaful Bhd. The company is working with the banking regulator, Bank Negara Malaysia, and aims to complete the sale in the next three months, the people said.

A representative from Bank Negara Malaysia declined to comment on the process. Under Malaysian regulations, foreign equity ownership in insurance companies is capped at 70%.

AMMB is seeking a partner with insurance expertise to help expand its profitable insurance business. One of the two insurance businesses, AmFamily Takaful Bhd, offers insurance compliant with Islamic law, meaning policyholders get dividends instead of interest. It is a valuable offering in Malaysia, where 60% of the country's 29 million people are Muslim.

The sale is the latest in a string of transactions by foreign players looking for a piece of Southeast Asia's financial industry. Banks and insurers from developed markets like the U.S., Japan and Canada have been looking to Southeast Asia for growth that they can't find at home.

Incomes are rising in Southeast Asia, home to 600 million people, and economic growth is buoyant compared to developed markets.

-Jason Ng contributed to this story.

Write to Cynthia Koons at cynthia.koons@wsj.com P.R. Venkat at venkat.pr@wsj.com and Abhrajit Gangopadhyay at Abhrajit.Gangopadhyay@wsj.com