A late rumour-led rally pushed Shanghai's A-share market to the top of the leader's board last week. Investors in the city's domestic A-share board heard rumours that the municipal government would give some listed firms preferential treatment, brokers said, though officials refused to comment. Seoul stocks gained 5 per cent last week as domestic investors rushed to buy shares ahead of an expansion in foreign investment limits. Beginning tomorrow, overseas investors can buy 20 per cent of a listed company, up from 18 per cent. Some domestic institutions were pushing up prices ahead of September 30, hoping to minimise losses on their books for the quarter. Seoul remains one of the black holes of Asia for the year so far, showing losses of 15 per cent since January. Bombay turned in the worst performance of the week. Political worries have weighed on sentiment and brokers expect things to get worse before they get better. Bangkok shares edged higher, but the SET Index continues to bump along, having lost more than 18 per cent so far this year. Kuala Lumpur's second board, always a volatile market, dropped more than 2 per cent, but the index of mostly speculative plays remains the best performer in the region. Prices have more than doubled since January.