Wall of worry for stocks just got higher
Wall of worry for stocks just got higher · CNBC

Markets are starting off the new year with a bang.

U.S. stocks plunged in a global equities sell off that started with a report showing a tenth month of decline in Chinese manufacturing. A weak U.S. ISM manufacturing report showing more contraction than expected Monday morning gave stocks another kick lower, with the Dow losing as much as 400 points.

Already there were hangovers from the old year — like concerns about oil oversupply, weak global growth and how frequently the Fed will raise rates. There's also the unexpected sharpening of tensions between Iran and Saudi Arabia over the weekend, following Saudi Arabia's execution of a Shia cleric.

Iranian protesters burned and attacked the Saudi embassy in Tehran, and Saudi Arabia cut off diplomatic relations with Iran. Oil rose as a result, with international benchmark, Brent crude, up 4.3 percent Monday.

"It's is a wake up call to the growing geopolitical and economic uncertainties around the globe," said Sam Stovall, chief equity strategist at S&P/Capital IQ.

Shanghai stocks sold off 7 percent before being halted.

"China I think is one of the risks to the global economy," said Russ Koesterich, global chief investment stratgist at BlackRock. "I don't think the sell off of the Chinese stock market is fundamental for U.S. investors but it clearly affects sentiment."

Koesterich said some of the selling in Shanghai was technical, as restrictions on selling and other measures that were put in place during the summer selloff were being lifted.

He expects more China related sell offs in coming years. "It's one of the things that's going to erupt over the next couple of years as teh economy transitions. It's going to be more a source of volatility than one that mitigates it," he said.

Traders traditionally look to the first trading days of the year for clues about monthly and annual performance. There's the old Wall Street adage - 'so goes January, so goes the year.'

But Stovall said January has often been a rough month for stocks, and stocks rarely just move higher during the year. The S&P 500 has reached a lower level than where it started out the year 87 percent of the time since 1945, he said.

"One-third of all year-to-date lows were established in January," he said, noting the next highest month was October at 13 percent.

Stocks closed out a dramatic but ultimately, unsatisfying 2015, with the market selling off into the close on its final trading day, turning in a sluggish and mixed performance for the year.