BEIJING - A total of 13.366 billion lock-up shares will become eligible for trading on China's bourses in May.

These shares will become tradable on the Shanghai and Shenzhen stock exchanges starting from May 6, according to data from the financial information provider Wind.

These shares are from 108 listed companies, Wind data showed.

Over 3.26 billion lock-up shares will become tradable on May 20, the largest amount in the month.

Under China's market rules, major shareholders must wait for one to two years before they are permitted to sell their shares.