Stock exchanges in Singapore, Malaysia and Thailand delayed a plan to set up electronic trading links to attract investment and raise liquidity, saying it would be done in 2012.
The plan, set to be finalised this year, will be joined by exchanges in the Philippines, Indonesia and Vietnam at a later date.
The proposal to launch cross-border trading was initially set to be in place in 2010, but has already been delayed for reasons such as the development of a new platform.