US stock funds recorded the largest outflows in almost three months, with $9.8 billion being redeemed in the week through Wednesday, as per Bank of America Corp's data.
Even European funds experienced their first outflows in nine weeks totaling $600 million.
The equity market rally has slowed down this month amidst uncertain global trade conditions.
Concerns about stagflation, potential rate cuts from the Federal Reserve, and tensions in the Middle East, with Israel targeting Iranian facilities, have impacted market sentiment.
S&P 500 futures dropped 1.2%, while the Stoxx 600 slipped 0.8% in response to the events.
Bank of America strategist Michael Hartnett highlighted signs of economic resilience but emphasized the need for broad market participation in further US equity gains for sustainability.
Hartnett cautioned that a stalled rally in European stocks and Japanese banks could signal a 'global equity bull trap' in the third quarter.
He recommended international equities over US counterparts this year.