European stocks were mixed in midday trading. France's CAC 40 was down 0.1 per cent to 5,142.77 and Germany's DAX slipped 0.4 percent to 11,818.81. Britain's FTSE 100 rose 0.6 per cent to 7,052.25. US stocks were poised to open higher, with both the Dow and S&P 500 futures up 0.1 per cent.
The big mover was the Shanghai Composite Index in mainland China, which earlier jumped 2.8 per cent to close at 4,657.60, the highest level since 2008.
They're also betting that the economic stimulus that has powered the Chinese rally will continue after recent poor economic indicators such as a disappointing manufacturing index yesterday.
"Even when you've got bad news, stocks are going up anyway," Sullivan said. "It is just pure liquidity, it's not fundamental in any way.
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Global investors are awaiting a speech later Friday by Fed Chair Yellen on the outlook for the world's biggest economy.
Data out yesterday showed US home sales in April slipped on tight supply while jobless benefit applications fell to a 15-year low.
A Chinese horse breeding, winemaking and financial conglomerate's Hong Kong-listed units saw further fluctuations a day after they plunged more than 40 per cent.
Goldin Properties Holdings Ltd jumped 6.3 per cent while Goldin Financial Holdings Ltd. Rebounded before sinking 3.1 percent in the final half hour of trading.
Earlier this week, another Chinese firm, solar panel maker Hanergy, tumbled in Hong Kong for no apparent reason before being suspended. The volatility is partly a sign of the rising flow of money from mainland China after the Hong Kong and Shanghai exchanges opened a trading link last year.
Australia's S&P/ASX 200 was little changed at 5,660.70. Southeast Asian indexes were mixed.