According to the BofA Merrill Lynch Fund Manager Survey for May, global investors lost interest in higher risk assets. While 47% of respondents continue to increase investment in shares, this index decreased by seven percentage points since last month.

Interest in U.S. shares fell: 19% of respondents are now reducing investments in this asset class, although there was an increase in investment in the first quarter.

Investors also lost confidence in corporate profitability. At the same time, cash positions sharply increased. This month's reading was 23%, the highest since December 2014. These shifts follow the recent selloff in bond markets.

The survey's results showed that an increase in respondents' assessment of bonds as the most volatile asset class in 2015.