Chinese highly volatile shares ended lower again on Wednesday after plunging on Tuesday, taking losses in 2016 to about 22 percent or 12 trillion yuan ($1.8 trillion).
The benchmark Shanghai Composite Index ended down 0.5 percent, having been up in the morning and as much as 4 percent lower during the day. It tumbled 6.4 percent on Tuesday to its lowest close since Dec. 1, 2014.
The CSI300 index of the largest listed companies in Shanghai and Shenzhen ended down 0.3 percent after a similar rollercoaster ride.
China markets began the year with a series of precipitous falls and a sharp depreciation in the yuan currency, and selling pressure has persisted as economic data confirmed slowing growth and deteriorating business conditions, hammering investors' confidence in stocks.
Gu Yongtai, analyst at Cinda Securities, said the prospect of investors having to sell stocks they bought with borrowed money in order to cover margin calls has also hurt sentiment.
"There's fear that stock price falls would trigger margin calls, which then adds further pressure on prices, although the actual amount of forced liquidation is not as big as people would imagine," Gu said.
Four listed companies suspended trading in their shares on Wednesday, saying their major shareholders, who have pledged shares as collateral, face margin calls and would seek ways to avoid forced liquidation.
"If the market continues to fall, equity pledging-related selling pressure could increase significantly, putting further pressure on the stock market," said Gao Ting, the Head of China Strategy with UBS Securities.Trading volumes have thinned, making price moves even more volatile, as many investors have given up on Chinese stocks since last summer, when shares crashed 40 percent.
Beijing intervened to stem that rout and orchestrate a recovery of sorts, but anyone who mistook that for a bottom and bought back in will be nursing losses again.
China's woes have damaged risk appetite in global markets, too, along with tumbling oil prices.
Investors across the world will hang on whether the market chaos of the last few weeks and concerns over China's slowing economy might blow the U.S. Federal Reserve off its proposed course of gradual interest rate hikes.
The Fed is expected to leave rates unchanged later on Wednesday and acknowledge that turmoil in financial markets threatens its upbeat view of the U.S. economy, leaving the chances of a March hike diminished but alive.
It raised interest rates in December for the first time in a decade, and the prospect of more such hikes has given the People's Bank of China (PBOC) an unenviable task of finding a level for the yuan that slows capital outflows without punishing the country's struggling exporters.
Investors remain wary of further weakness in the yuan, though the PBOC has kept the currency's daily midpoint fixing <CNY=SAEC> little changed since it gave the markets a fright with a sharply weaker fix in early January.
That was the second time in six months that the bank allowed a sharp slide in the currency, only to step in aggressively to stabilise it and deter speculation.
Spot yuan was at 6.5798 on Wednesday, a little firmer than Tuesday's close, while offshore it was 6.6114, a 0.5 percent discount to the onshore rate.
The central bank has been making plenty of liquidity available to the banking system to avoid any cash squeeze ahead of long Lunar New Year celebrations beginning in early February.
But those funds are largely of a short term nature, and the massive injections may have dashed some investors' hopes that the PBOC would cut banks' reserve requirements (RRR) soon to free up more money for longer term lending which could boost economic activity.
The decline in the yuan and concerns about the country's growth prospects have fuelled a flight of capital out of the world's second-largest economy which policymakers are struggling to contain.
Some hedge funds are still betting that Beijing won't be able to stem the outflows and the yuan will have to fall, pressuring other emerging market currencies.
China posted its slowest growth in 25 years in 2015, and the new year has seen a slew of weak economic indicators, including data on Wednesday that showed profits at Chinese industrial firms fell 4.7 percent in December from year earlier, the seventh straight month of declines.
Companies also say they are having a tougher time, among them Apple, which said overnight that while its revenue in Greater China was still rising, it was seeing "some signs of economic softness".
The broader dilemma for Chinese policymakers is that measures to boost growth are delaying reforms to rebalance the economy to more efficient industries, cut debt and reduce overcapacity, Moody's Investor Service said in a note.
(Writing by Will Waterman; Editing by Kim Coghill)