Sinopec Corp. , said on Monday it would join China's programme to convert non-tradable shares held by the state into free-floating shares tradable on the stock markets, China Daily reported. Sinopec's Shanghai-listed shares were suspended indefinitely with immediate effect. The comapny decided to launch its state share sale plan in order to make tradable its currently non-tradable shares, which totaled 250 billion US dollars, listed in the domestic A-share markets. The programme was launched in April 2005, and regulators have said it will basically be completed by the end of this year. Sinopec's announcement means companies accounting for over 90 percent of the markets' capitalisation have said they will join the scheme or have completed it, said the paper. Sinopec is the second biggest blue chip listed in China's domestic stock markets, accounting for some 12 percent of market capitalisation. Its suspension will temporarily give even greater weight to the biggest stock, Bank of China , which now accounts for around 15 percent of capitalisation.