European equities are flailing, and currency expert warns the worst is yet to come

Weak economic data and uncertainty in Italy have put European markets on track for their first weekly decline since March. One market watcher says investors should be wary here.

"The flashing light is still very much yellow and investors should take caution as far as European equities go," Boris Schlossberg, managing director of FX Strategy at BK Asset Management, told CNBC's "Trading Nation" on Wednesday.

A key metric on the euro zone economy, the region's PMI index, declined to an 18-month low in May, while growth in Germany's private sector came in at its slowest rate in 20 months. On top of that, Italy's new prime minister and populist government have raised the risk of conflict with the European Union over sovereign debt and immigration issues.

"All of this stuff I think is making investors incredibly uneasy about this situation in Europe," said Schlossberg.

The Europe Stoxx 600 was lower Thursday. A day earlier, disappointing data and continued unease over political change in Italy prompted a larger sell-off in European equities and the Europe Stoxx 600 index closed with its worst drop in two months.

Michael Bapis, partner and managing director at the Bapis Group at HighTower Advisors, has a sunnier outlook on the European economy and equities.

"They had the best economic growth in a decade last year and that hasn't gone away," Bapis said on Wednesday's "Trading Nation." "It's a global economy, the profits in the U.S. have shot up like a rocket ship, and we think European profits are going to follow."

The euro zone economy rose by 2.5 percent in 2017, according to FactSet data. The U.S. economy grew by 2.3 percent last year.

Companies in the Europe Stoxx 600 index are expected to post nearly 10 percent earnings growth this year, while S&P 500 companies are forecast for more than 20 percent growth, according to FactSet estimates.

"We would buy on this dip," said Bapis. "It's down significantly from the highs and so we would own it, we would allocate to it and longer term the U.S. rotation will happen and we'll move towards Europe."

The Stoxx 600 index is up 0.4 percent for the year so far, while the S&P 500 has risen 1.7 percent.

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Sara Eisen joined CNBC in December 2013 as a correspondent, focusing on the global consumer. She is co-anchor of the 10AM ET hour of CNBC's "Squawk on the Street" (M-F, 9AM-11AM ET), broadcast from Post 9 at the New York Stock Exchange.

In March 2018, Eisen was named co-anchor of CNBC's "Power Lunch" (M-F, 1PM-3PM ET), which broadcasts from CNBC Global Headquarters in Englewood Cliffs, N.J.

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