"This shows the demand is very strong," one of the sources told Reuters on Wednesday. "The book is closing tomorrow."
The port trust is a unit of Hong Kong tycoon Li Ka-shing's Hutchison Whampoa and is pursuing the multi-billion dollar listing to cash in on a recovery in global trade and provide investors with access to China's booming infrastructure business.
DBS , Deutsche and Goldman Sachs are the lead managers for the IPO, which could be Southeast Asia's biggest. The company was not available to comment, while the banks declined to comment.